About the Metra GMOS-01 Wiring Interface
Metra's GMOS-01 interface lets you replace the factory radio in select OnStar-equipped 2000-up GM vehicles using the existing wiring and connectors. Even if you don't subscribe to OnStar, you'll need this interface to connect an aftermarket stereo.
Hook the GMOS-01 to your aftermarket radio, mount the module, and plug it into the existing factory plug. Get the great sound you want, and keep all important safety features intact. And you can adjust volume settings for OnStar as well as the safety chimes. Also, once you turn off the ignition in these GM vehicles, the radio continues to play until you open the door. This interface maintains that function with your new aftermarket radio.
This interface is compatible with select 2000-up GM vehicles. If you haven't done so already, please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this item is compatible with your vehicle. Warranty: 1 year.
Note: The GMOS-01 will not work with factory-installed Bose car audio systems.
What's in the box:
Metra GMOS-01 Wiring Interface owner's manual
- GMOS-01 Class II Data Bus interface
- Wiring harness with 10-pin Molex on one end and bare wires on the other
- Wiring Harness with 12-pin Molex on one end and 24-pin Molex and 12-pin Molex on the other (plus bare wires)
- Installation instructions
Featured review
Easy to install and worked perfectly.
RICHARD from Carrollton, GA
Customer Q&A
Q
want to put a new radio in my 2007 H3 Hummer . Will I need this?
A
If your vehicle is equipped with onstar yes, you will need this to retain all the features
12 reasons to shop with us
Reason #11
Eco-friendly "peanuts"
Biodegradable and made in-house
REVIEWS
Customer reviews
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Metra GMOS-01 Wiring Interface reviews
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Customer photos
Metra GMOS-01 Wiring Interface
Crutchfield customer from Kirksville, MO on 7/7/2019
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Compton, CA on 6/25/2019
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Woodside, NY on 6/11/2019
2001 Chevrolet Venture
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Winter Garden, FL on 5/30/2019
2012 Chevrolet Colorado
Works great! Ideal item! Good price!
Pros:
Cons: Installation instructions could be better.
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Linthicum Hts, MD on 2/4/2019
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
RICHARD from Carrollton, GA on 1/28/2019
2010 Chevrolet Colorado
0 of 0 found this helpful
We'll see
Steven from Tupelo, MS on 1/21/2019
2009 Hummer H3T
Haven't had time to even start the install I expect this product to work flawlessly
Pros:
Cons:
0 of 0 found this helpful
Easy installation
Steven from Jackson, GA on 12/24/2018
2004 Chevrolet TrailBlazer
This worked great with my new JVC 930BTS. It was easy to hook up because I choose the Ready Harness and Crutchfield did all the connections, So all I had to do is take out of the box and plug into the vehicle wire harness and the JVC connector.
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0 of 0 found this helpful
Functional but pricey
Rich from Englewood, CO on 12/19/2018
2002 Chevrolet Monte Carlo
Does what its supposed to do. But it is really expensive for a wiring harness. I was expecting to find a more universal harness at another retailer but they dont have any that fit my car because of the onstar. Buying here was still cheaper than the audio shop in my area but I think the pricing on this is just outrageous.
Pros: Supports onstar and keeps all the chimes
Cons: Price
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Zachary from Sidney, NY on 12/19/2018
2008 GMC Canyon
I had one wire that was a little unclear as to where it should have been connected, but a call to customer service resolved that issue. The harness itself was set up a little goofy with wire lengths, made for a messy wire bundle to install, but I made it work. Instructions were okay, but they were missing a comprehensive master sheet feel. I had to reference both the installation instructions for this product and my radio's installation instructions, which took some time to piece together in my mind. I suppose there is no way around this, as this product is likely used on many different vehicles and radio installations. This install with Crutchfield's paperwork was much easier than trying to trace everything from scratch and figure out what hooks up to what
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0 of 0 found this helpful
Worked OK until it didn't
Eric from Caro, MI on 10/31/2018
2011 Chevrolet Colorado
Worked OK until it stopped working. Had battery drain that would kill the truck after a couple of days. Finally narrowed it down to this module. Unplugged it and the battery drain went away. Ordered a new one, hoping to just swap it out, but no! Had to cut the wiring harness again and re-solder all of the wiring for a second time because the connectors had changed. And the wire colors were not the same the second time either. And I didn't have the radio schematic any longer. Spent most of a day working on it, but got it working again and no battery drain. Not sure it was worth it. Should have left the stock radio in.
Pros: Worked for a while.
Cons: Had to replace to fix battery drain. ruined battery. connectors did not match first interface.
0 of 0 found this helpful
not really sure it was needed but installed anyway
George from Byron, GA on 8/12/2018
2016 Ford F-150 XLT
My grandson's 2006 Envoy does not have steering wheel controls, nor does he use OnStar but he may have needed it to preserve warning chimes so we got it and used it. The wiring instructions must be carefully studied, and matched up with the radio wiring instructions. We soldered the provided radio harness in, with heat shrink protection on each joint, and everything worked first time. It was kinda expensive for what you get.
Pros:
Cons:
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Alan from Midvale, UT on 7/19/2018
2004 Chevrolet Silverado 2500/3500
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Rocky Face, GA on 3/6/2018
2008 Chevrolet Colorado
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Saint Peters, MO on 1/31/2018
Wiring interface works as advertised. The instruction manual could be a bit more detailed.
Pros:
Cons:
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
JJ from Rochester, NY on 12/12/2017
2005 Chevrolet Colorado
0 of 0 found this helpful
Easy instal, everything works...
James from East Alton, IL on 12/5/2017
2012 GMC Canyon
I moved my Kenwood DNX6990 from my old truck to my '12 GMC Canyon and used this interface. It was an easy install and retained everything . I can finally hear the chimes because of the adjustable volume. Everything worked the first time.
Pros: Function Ease of install
Cons: None so far
0 of 0 found this helpful
gmos-01
David from Charlotte, NC on 9/27/2017
2009 Chevrolet Colorado
Looks like a nightmare but once you get into the instructions its not to bad.
Pros: color of wires
Cons:
1 of 1 found this helpful
Expensive but necessary item if you want to retain sounds / onstar
Roger from MO on 8/28/2017
2012 Chevrolet Colorado
It worked well to retain the alerts and onstar stuff. The install was not easy as the instructions are detailed but the plugs are not well marked. I ended up plugging the SWC into the Access unit as there was not an easy way to know what plugs into what end of the GMOS. (Yes, it actually fits into both ends) At one point I had the radio hooked up and working. But when the car was moving above 10 MPH the radio would turn off. This lead me to the incorrect plug in the adapter. After calling Crutchfield technical support, it was clear I had wired up the incorrect plug. They were very helpful and knowledgeable. Also it would have been nice to have ISO plugs that plugged directly into the GMOS-01 and radio, then we would only have to splice / join wires a few things instead of all the wires. For the price it should be easy.
Pros: When wired up properly works as expected.
Cons: Instructions could be much better, plugs could be marked better (A,B,C) and where they plug in could be marked (A,B,C), It would be nice to have ISO connectors included.
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Northville, NY on 8/18/2017
2007 GMC Sierra 1500 Classic
Just stopped working not giving power to my head unit or speakers
Pros:
Cons:
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Dave from Mokena, IL on 7/16/2017
2012 Chevrolet Colorado
It works great. The instructions aren't too clear but you'll eventually get it.
Pros:
Cons:
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Gilberto from Orlando, FL on 6/21/2017
2007 Hummer H3
0 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Tallahassee, FL on 6/13/2017
Had problem called talked with Tech they came up with answer had product shipped and installed fixed problem works great
Pros:
Cons:
1 of 1 found this helpful
Awesome product
Thomas from Boise, ID on 4/27/2017
2009 Chevrolet Colorado
This product made my JVC receiver super easy to install!
Pros: This was a great investment and made it easy to connect wiring to the receiver.
Cons:
0 of 1 found this helpful
Working as expected in my 2004 GMC Envoy
Thomas from Shelton, CT on 4/4/2017
2004 GMC Envoy
I'm usually pretty good at getting these harnesses wired up for my care HU installs. This one had the "extra" steering wheel control portion already wired in so I wasn't exactly sure what, if anything I needed to do with them. Found what it was and that I could ignore it. I'm not using my steering wheel controls. I called for some assistance with the wiring and was quickly helped by a tech and got the soldering finished. There are 2 ACC wires that come out from the harness, through the GMOS-01. One was obvious to me and I used that one to power the unit. The other was "extra" so had a question about that. Ended up being just another lead to power another accessory that I ended up using to power my rear camera. It was great to get help on a Saturday afternoon while trying to get the wiring done / HU installed. The connections took me a while because I like to solder my connections and use shrink tubing. I also triple check my connections to make sure I don't have to take anything apart and do it again. The only additional item I had to hook up once the harness was installed in the car was my sub turn-on lead. I used one of those quick tap splice connectors to make the connection to my remote wire. If it ever comes loose, I'll just figure out a way to solder it as well. If you take your time and lay out the cables, it should be a pretty straight forward job to connect them. Other than that, seems to be a good prod
Pros: Chimes work, On-Star works, Car Safety features work
Cons: A little bulky, Steering control wires should be optional
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Brick, NJ on 3/19/2017
2006 Buick LaCrosse
0 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Goshen, IN on 3/16/2017
2008 Chevrolet TrailBlazer
Works but the instructions suck, took an hour or so to complete the wiring
Pros:
Cons: Poor instructions for a wiring diagram and hard to understand
1 of 1 found this helpful
would not reccomend
Doug from Salina, Utah on 2/20/2017
2012 Chevrolet Colorado
Poor instructions, unreliable connection through device. I soldered all my connections to it and I still have a speaker that fades in and out while driving
Pros: Retains door chime once everything is connected easy to install
Cons: Where it connects into its box is less than reliable. I have a speaker that fades in and out.
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Leesburg, OH on 2/6/2017
2005 Chevrolet Silverado 2500/3500
0 of 1 found this helpful
Lacking Info !
Crutchfield customer from Baltimore, MD on 1/22/2017
2004 GMC Envoy
Confusing and Lacking some info that Crutchfield costumer service had that is not in the instructions that the consumer gets.
Pros: If it wasn't for the good tech support of Crutchfield I wouldn't have been able to use.
Cons: Bad instructions.
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Brandon from San Antonio, TX on 1/17/2017
2005 Buick LaCrosse
This wire harness does exactly what it's supposed to connect in my aftermarket DVD player no problem retain OnStar
Pros: This wire harness comes with plenty of wire you may even have to cut some off
Cons: The connectors that go into the little black box did not clipp very well had to zip tie them in place
1 of 1 found this helpful
Good harness, buggy instructions
Jerry from Alexandria, LA on 1/11/2017
2008 Chevrolet Colorado
If you really want to make this simpler for average people, you need to hire a good technical writer who has used the product. He would make it clear that some users will not need to connect some wires, and he would make sure that the wires on the connectors are correctly described. If you are having trouble connecting the harness, scroll through the reviews here -- other people have already solved your problems.
Pros: Does a necessary job
Cons: Poor instructions
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Urbandale, IA on 1/7/2017
2007 Chevrolet Colorado
Worked. Flakey connections so not sure how long it will last.
Pros:
Cons:
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Steve from Clinton, IA on 12/31/2016
2005 Saturn Relay
This worked good. I wish some of the instructions were a little clearer or the fact that is add on was actually a necessity not an actual option. I had a few extra wires that turned out to not be needed. Overall satisfied though. Customer service was wonderful with every question I had regarding this.
Pros: Easy to assemble.
Cons: A few extra wires & two power wires connected to one power wire.
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Mike from Thompson, CT on 12/29/2016
2008 Chevrolet Colorado
The factory radio/ cd player quit in my 08 colorado crew cab. It has on star and the basic cd player with door tweeters. I installed a double din kenwood with the Gmos -01 wire harness and it works perfect. Without the module/wire harness the truck would not start and bypassed safety chimes on top of needing separate power feeds/ grounds.
Pros: Pretty easy install
Cons: Could be more specific wire schematics.
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Lynchburg, VA on 10/24/2016
Great product and very helpful service getting the right part.
Pros: Need to have and makes it so easy to use the factory setup.
Cons: Have to take your time wiring and make sure all is right
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
LAWRENCE from West Chester, PA on 10/19/2016
2006 Hummer H3
0 of 0 found this helpful
Install gear
Coop from South Carolina on 10/9/2016
2010 Chevrolet Colorado
0 of 0 found this helpful
Install kit
Brian from Littleton, CO on 8/27/2016
2009 GMC Canyon
works well, easy to install, had all connections necessary for rear view camera operation.
Pros: I like that it ducks the front speakers for warning chimes.
Cons:
0 of 0 found this helpful
Clean and easy install, Retained all OEM functions
Curtis from Queen Creek, AZ on 7/19/2016
2012 GMC Canyon
Very clean and easy install, The size of the box made me a little nervous about it possibly rattling in my dash but its been installed for 3 years and not a sound!
Pros: Easy install
Cons: Maybe include some foam to wrap the unit to avoid rattles.
1 of 1 found this helpful
Needed accessory
Scott from Bethlehem, PA on 6/13/2016
2003 Chevrolet TrailBlazer
Has all the features to keep your vehicle in OEM operating condition.
Pros: Works great, all features retained as expected
Cons: Instructions are a little tough to follow. Plugs do not securely lock into module. Mine came apart twice during installation.
0 of 0 found this helpful
Gmos01 for 2012 canyon
Ger from Bound Brook NJ on 6/9/2016
2012 GMC Canyon
Works as described.
Pros: Works fine.
Cons: A little bulky but you will find space behind your radio for it.
0 of 0 found this helpful
Great Product, Confusing Installation
Michael from Fairfax, CA on 6/3/2016
2002 GMC Envoy
The device itself works perfectly to make the "retained accessory power", chimes (and probably OnStar as well, but OnStar is broken on my GMC so I can't test) work with an aftermarket head unit. Unfortunately, the included instructions and wiring diagrams leave much to be desired - they don't explain that the two red wires should go together. After a call to Crutchfield I was able to complete installation and now the Metra GMOS-01 works well, though it is a bit pricey for what it is.
Pros: Lets you keep retained accessory power, chimes, and onstar with an aftermarket head unit.
Cons: For the price, the instructions should be perfect!
1 of 1 found this helpful
Metra GMOS-01 Wiring interface
Alex from Great Bend, KS on 4/10/2016
2008 Chevrolet Colorado
It's doing what it's supposed to do. No complaints. Wired up fairly easy.
Pros: Wired up with no problems.
Cons: None so far.
0 of 0 found this helpful
Perfect
Wayne from marshfield, WI on 3/20/2016
Came with new head unit and worked just as advertised
Pros:
Cons:
0 of 0 found this helpful
Instructions are outdated but works fine
Chase from Morehead, KY on 3/8/2016
2008 GMC Canyon
The instructions are very vague and do not explain why you have extra wires (or what to do with them). After some frustration I was still able to wire my head unit correctly. I tested that my door chimes and OnStar worked correctly and I was good to go. Mine had two red wires (the instructions on mentioned one). I was able to figure out that both red wires need connected to the single red wire on the head unit harness. Simple enough. The remaining harness was leftover for steering wheel controls (which I do not have). I simply shrink wrapped the ends and left it alone. Works as it should, but shouldn't have been so confusing to wire up. I assume a call to Crutchfield would have remedied the problem, but I don't believe it should have been so difficult.
Pros: Works perfectly
Cons: Poor and confusing directions
2 of 2 found this helpful
Good harness though the instructions need a bit of work.
pbo from san jose, CA on 2/14/2016
2008 GMC Canyon
The harness is good and allows you to install an aftermarket stereo keeping OnStar and the door dings. The problem is, the instructions tell you to "connect the red wire" when there are two. Talking to both Crutchfield and Metra I was told to connect both together. The Web is littered with people asking about this and various answers from connecting both to connecting one to power and one to another accessory. In my conversations with Metra, I suggested they fix the instructions. Also, the wires themselves have "dimmer" listed on the wire that while it does dim the radio actually connects to the vehicle's illumination (for when the dash lights come on). I was concerned about possibly connecting the wrong wire as some have suggested mixing these up can damage the stereo. I bit of clarification on both of these would be welcome.
Pros: Easy to connect and wire up. Allows for use of OnStar and keeps normal door/alert chimes.
Cons: Instructions could be a bit clearer. Once I knew what to do with the two red wires and had confirmation that "dimmer" should connect to the interior lights, installation was a snap.
0 of 0 found this helpful
Axxess GMOS-01 GM 2000-UP
Jason M. from Minnesota on 2/14/2016
2012 Chevrolet Colorado
I ordered this to install my aftermarket head unit and Alpine Power Pack in my 2012 Chevy Colorado, and I gotta say it was nothing but a headache. It's not my first time installing stereos, as I have done dozens, but this one is probably the worst one I have done. I took to the internet for better directions and still had no luck, even with the provided paper directions in front of me. Needless to say I had our local pro installer check it out and he said this won't work for me, even though it was a deemed a fit from Crutchfield. Even after he did a temporary install the speakers cut out every time the stupid chime went off, and there is no R.A.P. so when you shut the vehicle off the stereo is instantly off, whereas my radio stayed on just fine and everything worked in my 2006 Colorado with a cheaper wiring harness. I am hoping I can return this and get a full refund for it because I would of never bought it if I had known the headache it would give me. Save your money on this one, talk to your local shops for the correct wiring harness, I ended up spending $99 on theirs and as for problems, not a 1!
Pros: Was cheaper than the $129.99 part.
Cons: Directions suck, install is a headache, say goodbye to your music when the annoying chimes kick in.
0 of 0 found this helpful
Man that's a lot of wires
Joshua from Atlanta, GA on 2/3/2016
2003 Chevrolet Venture
Worked great, and i'm sure it would be even better with better instructions. My vehicle didn't have steering wheel controls, back up camera, Nav or anything else so it was slightly overwhelming. I only needed about 1/2 the wires supplied and it was kinda difficult to determine which was which. The instructions were clear but only had one wiring diagram. They really should have more than one for the installs that don't require every cable.
Pros: Worked great, I really like the adjustable sound level for the door chimes
Cons: Too many wires for a simple install and only one wiring diagram for all possible installs
1 of 1 found this helpful
Worked well, but those two red wires though
Ralph H. from wichita falls, TX on 1/25/2016
2005 Chevrolet TrailBlazer
You have a lot going on with this harness. And the instructions are decent with the exception of the instructions referencing a red wire to connect to the head unit red ignition wire. But there are two of those red wires. A bit of a head scratcher. Called Crutchfield Support on Sunday Afternoon and they quickly told me to use both red wires. That got me going again..
Pros: Unit worked as advertised. Crutchfield sent everything I need for this install. Tech Support available on Sunday when I had time to do the install is HUGE!!
Cons: Perhaps Crutchfield could send a supplement to the manufacturer's instructions to clear up the 2 red wire thing.
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Tennessee on 12/20/2015
2006 Chevrolet TrailBlazer
Worked as advertised. Not to hard to wire up. I would rate the task as intermediate .
Pros: Merta website has good install document.
Cons: Slightly small gauge wires but ok for 22 watt radio. Kind of a one product fits several applications, On Star, Steering wheel control. Would not let this discourage me from purchase.
1 of 1 found this helpful
Perfect!!!!!
RMiller from Ohio on 12/12/2015
This wiring harness worked perfectly for 08 Hummer!!!!
Pros:
Cons:
0 of 0 found this helpful
Directions need to be more clear
LazyBoy Driver from Maryland on 11/30/2015
2009 Chevrolet Colorado
I bought this for 2009 Chevy Colorado. To me, the directions need to be more clear. You might laugh but add pictures of what the 16 pin and 12 pin connections are. I'm not an electrician so when I read the directions.....I started scratching my head. I watched videos online to try and figure it out. Ended up figuring it out by counting the pins on the connector. I had to e-mail the manufacturer because on the 16 pin connector, it told me to connect the red wire....well there were 2. I had to verify I was to connect both of them. They did reply back rather quickly so their customer support is outstanding. Once I connected everything and installed the harness to my new Pioneer DVD player and rearview camera, it worked like a champ. Was able to view the rearview camera with connections made via this harness....didn't have to cut into or splice into other wiring harness. I was able to keep my OEM warning chimes (chimes that sound when you leave your lights on or leave your keys in the ignition). Once I got over my frustration of how to connect it, it was easy to connect and install. All the new equipment worked as advertised. I was very happy once I figured out what the directions were talking about. If it wasn't for the directions, I would have given it a 5 star rating.
Pros: Kept my OEM warning chimes and was able to connect my new DVD player and rearview camera without having to splice into other harness.
Cons: Directions are clear enough.
1 of 1 found this helpful
Essential piece of euipment
John from Alabama on 11/22/2015
2009 GMC Canyon
Installed with a new Sony Unit and was able to maintain all factory functionality such as On Star, door chimes, etc.
Pros: Once the wiring diagram was figured out, made installation extremely simple and straight forward, taking all of about thirty minutes.
Cons: Like many other reviews state, the instructions for the wiring diagram are atrocious. Confusing and worst of all, incomplete.
0 of 0 found this helpful
Worked perfectly for 2006 chevy uplander.
Mindmatrix from Arizona on 11/2/2015
2006 Chevrolet Uplander
Worked perfectly for my 2006 chevy uplander.Instructions where vary limited,but if you follow them exactly and don't need to know what all the extra wires are for thay are sufficient.
Pros: Let's you use a aftermarket stereo.
Cons: Does not give you details on the additional 12 pin connector or what it's for.Makes you wounder why it has so many unused wires and whether you should cap them off.
0 of 0 found this helpful
Easy install
Dave from Arizona on 10/4/2015
2006 Hummer H3
Made the the installation easy
Pros: Customer support helpful.
Cons: Instructions voukd have been a little clearer.
2 of 2 found this helpful
Works great
Chris from Tennessee on 9/24/2015
2004 GMC Envoy
Put this in an '04 GMC Envoy. Easy enough wiring guide. Google any questions you might have about the wiring because odds are someone else has already gone through it.
Pros:
Cons:
0 of 0 found this helpful
GMOS-01
GM77 from Missouri on 9/8/2015
Good product, poor directions!
Pros: Worked just like advertised
Cons: Directions from Metr/Axxess were incomplete
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from North Carolina on 7/4/2015
2009 Chevrolet Colorado
Great product, wiring diagram was clearly explained & connectors fit perfectly
Pros:
Cons:
0 of 0 found this helpful
Works well
Jade from Brandon fl 33511 on 6/25/2015
2002 Chevrolet TrailBlazer EXT
Worked perfectly
Pros: Fast hook up easy to use
Cons: None
0 of 0 found this helpful
good quality
Ike from Philadelphia, New York on 6/1/2015
2005 Chevrolet Avalanche
works great, plug and play item unless your using a steering wheel adaptor also but still a must have for proper installment.
Pros: high quality easy to use.
Cons: none
0 of 0 found this helpful
GMOS-01
JimmyC from Arizona on 5/30/2015
2005 GMC Envoy
Worked exactly as described. I carefully put together the harness with the GMOS-01 and the radio harness, soldering and heat shrinking all connections. When I installed the radio and plugged it all in, everything worked perfectly. Did have to call technical support on a couple of questions, namely the existence of an extra red wire on one connector that wasn't mentioned in the instructions (regardless of what you see on the inter-web, you do not need to connect both of them together and then to the ignition power input to the head unit, just use one of them and tape off the other or use it for power for something else) and extra orange and orange-white wires on the other connector (they were taped off in my application). Works flawlessly. I get all my chimes through the front speakers, then it ramps the sound back in after the chimes. My rig has On-Star, but I don't use it so I have no comment on that.
Pros: Integrates the factory wiring harness and uses all factory connectors and wiring to the speakers. The only wiring I did in the truck was to the add-on powered sub. Otherwise, the complete harness was assembled at my dining room table and was plug-and-play in the dash; no in the dash connections were required. Wires are color coded to factory wiring, so between the instructions and matching wires, it was easy sailing.
Cons: Instructions were not crystal clear and did not mention some of the wires.
2 of 2 found this helpful
Metra GMOS-01
JH from Santa Claus, IN on 5/26/2015
2008 GMC Canyon
Product works great, all of my factory items still work as they originally did. The only complaint I had was I thought the instructions could have been slightly more detailed. No complaints now that it's installed.
Pros: Retains all factory chimes and functionality.
Cons: Instructions could have been a little more detailed.
0 of 0 found this helpful
like it
Kevin from delphos, ohio on 4/28/2015
2004 GMC Envoy
Plugs right into my 04 gmc envoy
Pros: Makes it easier to hook radio to my car
Cons: Wiring is a lil bit hard to hook up
0 of 0 found this helpful
Quality harness for 2008 Chevy Colorado
Steve-F from Tennessee on 4/22/2015
2008 Chevrolet Colorado
It seems like a ton of wires to connect and figure out, but it's really not that bad once you get started. I took my time and soldered all my connections to the stereo harness so they are all solid connections. Used the heat shrink sheathing to cover the solder connections.
Pros: Works great, no problems at all.
Cons: Some wires were not needed for my vehicle and that made it a little confusing trying to figure out what was what.
0 of 0 found this helpful
Perfect
Willis from North Carolina on 4/22/2015
2008 GMC Canyon
Easy to wire up, keeps all your lovely chimes and such (if you want).
Pros: Easy Setup, Works Perfect
Cons: None
0 of 0 found this helpful
Worked really well
Brian WV from West Virginia on 3/29/2015
2006 Hummer H3
Works so well on my h3 its awesome to have the correct wiring the first time with security it will be correct with home installs the first timer can use this product with ease! kept my onstar and hands free calling also
Pros: great ,comes with option wiring for steering wheel controls ans onstar is retained!
Cons: non
0 of 0 found this helpful
Does not Work
George from SA, Texas on 3/27/2015
Trying a simple Kenwood double din install in a 2005 Tahoe. I found the wiring instructions for the GMOS unit very simple, matched up well with both aftermarket radio and factory plug. However after 2 weeks of calls and emails traded with Metra tech support the unit will still not initialize. No chimes, no 12V to radio, nothing.
Pros: Straight foreword install. Tech support is available and responsive
Cons: Doesn't work
0 of 0 found this helpful
Harness for Chevy Trailblazer
Jake from Arizona on 3/23/2015
2007 Chevrolet TrailBlazer
So far the product has worked really well. I bought this to install an aftermarket cd player/tuner in a Chevy Trailblazer. Most of the wiring was pretty strait forward. The wire colors matched up pretty well with the wires from the new unit, except there were 2 red wires. Instructions were vague on this installation, however after a little research online the 2 red wires were suppose to be connected to the red constant power wire for the unit. Other than that everything else was a breeze.
Pros: For the most part pretty strait forward with connecting wires by color.
Cons: Picture wiring diagrams would help.
0 of 0 found this helpful
Works Great
CME from Michigan on 3/5/2015
2007 Hummer H3
Works great. It's a little intimidating at first sight but follow the directions and go one wire at a time.
Pros: Works great
Cons: looks intimidating
0 of 0 found this helpful
Great
Devon from Anchorage, AK on 2/15/2015
2007 Hummer H3
Great product, quick and easy to install. Had it wired and ready to go within 10 minutes.
Pros: Quick, easy, all the wires are labelled.
Cons: None
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from west haven ct on 2/15/2015
2005 Saturn Relay
Bought this product for my 05 Saturn Relay with on star. Replace factory radio with an aftermarket radio. Hooked up all the necessary wires & plugged into original harness in car. No problems with it so far.
Pros:
Cons:
0 of 0 found this helpful
Great product
Mb from New York on 2/9/2015
I had this installed in my 2005 GMC Envoy and it was an easy install. All the wiring matched perfect so it took half the time it normally would. Great product
Pros: Easy to install.
Cons: None
0 of 0 found this helpful
Bad instructions
Michael from Boston on 1/7/2015
2008 Pontiac Grand Prix
If only the instructions gave a complete guide of how to complete, then the product would be good
Pros:
Cons:
0 of 0 found this helpful
What was this for?
mmaxon888 from Fort Calhoun, NE on 10/15/2014
2004 Chevrolet Silverado 1500
Not even sure what this adapter was supposed to do. I was under the impression I would retain my steering wheel controls, but that is not the case. Doesn't look like I needed this part at all.
Pros: Easy to attach. Had question during install, Crutchfield customer service answered phone right away and fixed my issue. Knew exactly what I needed to plug in even though I didn't know exactly what I was asking for!
Cons: Did not do what I thought it would. In fact, it doesn't look like I needed the adapter at all.
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
DennisK from Mendon, MA on 10/12/2014
2012 Chevrolet Colorado
Not for the faint of heart. I am an electronics technician and I needed to call Crutchfield for assistance. Instructions are not great. These are one size fits many and there is no guidance as to what to do with the extra wires. Don't hesitate to call for assistance.
Pros: It works.
Cons: Poor instructions.
0 of 0 found this helpful
Works as advertised
Tom N. from Dillsburg PA on 9/2/2014
2012 Chevrolet Colorado
I'm not sure what everyone complained about in these product reviews. I thought the instructions were easy to understand and that the product works as advertised. I read the instructions 1-2 times and then hooked it up to my new stereo step by step. I'll admit that upon first glance wiring this to the stereo can be daunting, but hooking every wire step by step turned out to be very simple
Pros: Everything that this is supposed to do (Bluetooth, OnStar) works
Cons: None
0 of 0 found this helpful
wiring
jim from Portsmouth, Va on 8/28/2014
2005 Chevrolet TrailBlazer
very easy to install and a great time saver
Pros:
Cons: none
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Bedford, OH on 8/19/2014
0 of 0 found this helpful
metra gmos 01 factory intigration adapter
cris f. from hamilton,oh on 6/23/2014
Tricky but read it carefully all detailed well.
Pros: If u know what u r doing it's easy as 123!
Cons: None
0 of 0 found this helpful
Metra GMOS-01 Factory Integration Adapter
Tim from Aurora, CO on 6/20/2014
2004 Pontiac Grand Prix
I soldered all the wires so the went well
Pros: For my application it worked great.
Cons: Some of the wires could be longer to make connections easier.
0 of 0 found this helpful
Metra GMOS-01 Factory Integration Adapter
MikeO from Denver, CO on 5/18/2014
2008 Chevrolet Colorado
Having to buy this otherwise Crutchfield won't support your service was a bit of a drag. But, after installing this I'm glad I put it in to retain the original chimes and OnStar.
Pros: Keeps the door chimes and OnStar. Easy to install.
Cons: Necessary purchase if Crutchfield support is desired.
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Cumming, GA on 4/30/2014
2005 Chevrolet Avalanche
Hookup was quite simple; however, I had to google to determine the exact location for some of the wires. The instructions could be a little more clear and could have mentioned that there are two red wires but only one is necessary. Crutchfield didn't recommend the Steering Wheel Remote module as a needed accessory. It is mentioned in the details of the unit but not when you select the headunit. Only this and the mounting adapter came up as a needed accessories.
Pros: Works perfectly.
Cons: Had to research for details on some of the instructions as not all wires are mentioned in the instructions.
0 of 0 found this helpful
OnStar interface
Tom J from Newington, CT on 4/6/2014
I still do not have an AM antenna working
Pros: Works for interface
Cons: Incomplete instructions, can't get AM radio antenna to work.
0 of 0 found this helpful
Good harness
Zeke from Sun Prairie, WI on 4/4/2014
2006 Pontiac Grand Prix
This was the same harness that I had bought before from a certain electronics store but was charged about double there and it was even an return but anyways the harness is good and works great one thing was that I had a lot of extra wires that we're not needed for my stereo
Pros:
Cons:
0 of 0 found this helpful
works great
Julzee from Pittsburgh PA on 3/31/2014
2008 Chevrolet TrailBlazer
I really like the lower volume of the door and seat belt chimes. I don't always wear my seat belt and the intermittent 'nagging' always got on my nerves but not any more...:)
Pros: nice soft chime vs original louder nagging
Cons: none
0 of 0 found this helpful
Great product
Crutchfield customer from lagrange ky on 3/15/2014
2005 Chevrolet TrailBlazer
I had to buy thus adapter to install my Pioneer head unit because I have Onstar on my Chevy Trailblazer. Everything works great! Chimes even sound factory & not corney like some do! Once I got my old reciever out the adapter was very easy to install!
Pros: Factory sounding chimes Clear sound Easy install
Cons: A little more pricey than I wanted
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
2007trailblzr from Yadkinville, NC on 3/10/2014
2007 Chevrolet TrailBlazer
A must have when doing an install on a trailblazer it simplifies the process.
Pros: Makes the install almost seamless. Retains the onstar feature as well as the factory chimes.
Cons: No way to really control the volume of the chimes they are too loud.
0 of 0 found this helpful
Take your time and this will work.
RSS from Benton.Ar on 2/17/2014
2012 Chevrolet Colorado
The product works well but the instruction manual isn't very clear. The manual doesn't give clear instructions on connecting the GMOS box , infact part of my manual was missing. With help from the Crutchfield tech (theses guys ROCK!) support I was able to complete the installation. Just be sure that all wires that are not used are taped up well and make contact with nothing or you will be replacing fuses. Found this out the hard way when some tape slipped off.
Pros: Works well and maintained all the safety features of my truck.
Cons: Instruction manual can get vague in some places. Pages were missing.
0 of 0 found this helpful
Does what it says
Chris M from Collegeville, PA on 2/6/2014
2006 Pontiac Grand Prix
Vehicle: 2006 Pontiac Grand Prix GT with factory radio (without Monsoon). Gear: Pioneer FH-X700bt, ASWC, GMOS-01 I will start by saying I have never installed a head unit before in my life. This was my first install. When you look at the GMOS-1, you might get intimidated by the mess of wires included with the Adapter. Don't be. As long as you are not color blind, installation is incredibly simple. The instructions are pretty easy to read too. I don't understand why people think they are confusing. I'll repeat, I have never installed a radio in my life. In fact this was the first time I have picked up a soldering iron. Trust me, if you have ANY cognitive skill at all, the directions are easy to follow. Functionality is dead on as described by the product. I LOVE that I can adjust the volume of the chime. Although I do hate the chime, I did not want to lose them. I am extremely happy that I can put the volume as low as I want. Integration with the ASWC interface is prety awesome. Again, those instructions are pretty simple to to follow as well. My steering wheel controls work flawlessly and I am very happy that I did not have to splice into the factory female harness. The GMOS-01 makes installing the ASWC even easier than it already is. Just get the dang GMOS and stop being cheap.
Pros: Chimes work (play through driver front speaker only) Adjustable chime volume RAP retained On Star retained ( I don't use it) ASWC integration NOTE: A lot of people are confused as to why there are two red (ignition) wires on the 16 pin harness of the GMOS-01. It is there in case you are using the ASWC. Connect one to your HU harness (doesn't matter which). Then connect the ASWC's harness red wire to other red wire in the 16 pin harness. Tape/cap it off if not using, duh.
Cons: Mess of wires, but common sense should tell you how to organize them for an easier install in the dash. Electrical tape or zip ties are your friends to group wires effeciently. Obviously, solder and heat shrink connections. Never seal an electrical connection with tape.
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
John O from Houston TX on 1/10/2014
I would like to start off by saying everything is setup and working great. Second, This harness is a universal setup for ALLLLot of vehicle models for alllll the different stereos so it scared me at first. I took the harness over to my uncles (ocd/electrical engineer). Yes he got it installed/wired/working. As everyone has stated the instructions borderline a writing nightmare. If you lay out the harnesses and get pigtail connectors on your stero harness you can easily get the harness hooked up fast. Yes there is about 9 wires I didnt use and to the OCD person it makes you double check everything. The system works great and retains all factory chimes and do-dads. 2006 base model envoy with pioneer deck.
Pros: It works
Cons: Have an extra 20 for the installer ready or buy them lunch
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
kyle from monroe Tennessee on 1/5/2014
Product was alittle intimidating at first due to the many wires. But with the help of directions included and the wires being color coordinated installation was easy.
Pros: Great directions and friendly customer service that was extremely helpful and knowledgeable
Cons: Two wires were not red like my factory car wiring harness but were pink instead. But they did have the correct writing on them which helped out.
0 of 0 found this helpful
Confusing, but works
BobF from New Orleans on 12/15/2013
Lots of extra wires, instructions not very detailed. After I hooked up the radio I had a problem with the sound, but after a couple of calls to tech. support everything is working fine. The reason I buy from Crutchfield is there customer service and tech support.
Pros:
Cons:
0 of 0 found this helpful
I've seen better
ZeeB from Manchester, NH on 12/12/2013
2006 GMC Canyon
The instructions are really quite thin, I had a bunch of extra wires left over at the end of putting this together. I ended up calling Crutchfield tech to sort things out.
Pros:
Cons:
0 of 0 found this helpful
Keeping the Chimes alive
Chris from Olathe, KS on 11/22/2013
2011 Chevrolet Colorado
Very simple and straight forward to install. Wire diagrams and color coding made this a snap.
Pros: Keeps my factor chime intact.
Cons: Additional install.
1 of 1 found this helpful
Does the job!
DJ from Columbia, SC on 10/1/2013
2007 Chevrolet TrailBlazer
All the alarms and sounds were retained. That's what it is supposed to do.
Pros: Works well.
Cons: none
0 of 0 found this helpful
Great Product
DarrenG from Nebraska on 10/1/2013
Easy install, works as advertised.
Pros: Adjustable chime volume.
Cons: None
0 of 0 found this helpful
Works as promised.
Bob W from Shrewsbury, MA on 10/1/2013
2002 Pontiac Montana
Bought this to maintain my OnStar and factory chimes... Works perfect! Lots of wires including some extra that weren't needed for my install, but I figured it out by searching forums online.
Pros: Works well. Shuts off stereo for OnStar voice and turns it back on when OnStar is done.
Cons: OnStar voice only comes through front left speaker. Pricey (even with half off for buying a head unit at the same time) Wiring diagram could be more helpful.
0 of 0 found this helpful
Review for the Metra GMOS-01
Rich from Somers, NY on 9/24/2013
2005 Chevrolet TrailBlazer
Works as advertised. Haven't missed a beat with OnStar and door chimes. Wiring diagram was a little confusing, but Crutchfield tech support answered all of my questions.
Pros: No problems and works as advertised.
Cons: Wiring diagram
0 of 0 found this helpful
You get what you pay for
Josh from Michigan on 8/31/2013
I purchased this with a new pionner double din with the mixtrax,knowing little for what it was for.I've installed many decks and never had to use something like this.FIRST, theres alot of wires you wont use if you dont have a monsoon system or steering wheel controls.SECOND, theres two red power wires you have to twist together and connect to red power wire on deck,witch should have come pre-done or at least saying something about it the directions.THIRD,I dont like how chimes only come from drivers speaker,at first i thought i had it wired wrong but its normal i suppose.And the thing wont store my date and time on the dash anymore.Did Everything by the directions and even called Crutchfield for help,OVERALL this product works(sort of) but not in anyway near factory condition.Not happy with it.On a side note,Crutchfield's customer support is awesome,never been on hold more than 2 minutes and those guys really know what there doing. A+ to you guys in tech.As for you guys in the product buying department,you need to sit down with Metra and get these things fixed because even for the price,its not worth it.
Pros: dont really have one,just needed it
Cons: pain in the butt to install,low quality
1 of 2 found this helpful
Great for price.
Joeh24 from Dallas tx on 8/12/2013
2007 Hummer H3
For the price it's a great deal. 50% off with buying stereo.
Pros: Chimes volume adjustment,on star adjustment.
Cons: None
1 of 1 found this helpful
First one died secound one worked...
Dave C from Currituck, NC on 8/2/2013
2007 Chevrolet TrailBlazer
First time installer. I was a little confused with all the wires but I'm a technical person and had no problem figuring it out. The first unit work until I put everything back in and then the deck wouldn't come back on. It was just a Pioneer DEH-X5500HD, nothing special. So, I ran a double fuse wire to the deck and it worked. Then the battery started dieing so I asked around and no one could help. Then I called Crutchfield and they said it might be the brain. So, they sent me a new adapter and that one worked. I the problem is fixed and no more dead batteries. The only reason I gave this four stars and not five is because the first one died after I did all that work.
Pros: It's worked
Cons: First one worked then died
1 of 1 found this helpful
Worked for awhile
Tim from PortOrchard , WA on 7/24/2013
What they don't tell you; Chimes come from left front speaker only, low fuel chime is gone, and radio won't dim with lights on. Worked as I described, and learned to live with these faults. Now the deck goes into "protect" mode when I turn left randomly. Had the deck out numerous times and nothing is loose. popped the cover off the module, nothing appears loose. All connections are soldered and shrink wrapped. I have installed numerous decks over the years, so I am no new to this. I agree with the other review, wiring diagram is horrible. Not happy at all!
Pros: none
Cons: see review
0 of 1 found this helpful
Top Notch Product
Phil from Fresno, CA on 7/9/2013
2003 GMC Envoy
Adapter works very well with new receiver and factory equipment.
Pros: Good price, with receiver purchase.
Cons: None
0 of 0 found this helpful
GMOS-01
Jeff from Houston,TX on 7/8/2013
Installed in an 06 Suburban and hooked up to a JVC KD-A845BT alongside the Axxess ASWC-1. Everything works as advertised. I soldered and shrink wrapped all connections for a nice clean install. The completed harness was a mess with 2 interface boxes and multiple pig tails, but it all works.
Pros: Price, ease of install
Cons:
0 of 0 found this helpful
GMOS-01 Unreliable
kn from Atlantic. City on 7/7/2013
2008 Pontiac Grand Prix
Installed in my 2008 Grand Prix with a Kenwood navigation receiver, worked great for a few months. Then one night the receiver would not turn on. I removed the Kenwood and sent it for repair. Reinstalled the repaired Kenwood and it worked. This problem happened again in a few months, Kenwood was again repaired and reinstalled successfully. Next time this problem recurred, I unplugged everything then reinstalled: Kenwood worked without being repaired. Then it happened again. This time I simply unplugged the GMOS-01 connector then replugged it, and the Kenwood worked again! The problem was not the Kenwood receiver, but the intermittent faults in the GMOS-01.
Pros: Perform as described when it works
Cons: Unreliable. Keep shutting down the receiver randomly, requiring unplugging the GMOS.
3 of 3 found this helpful
GMOS-01 Factory Integration Adapter
JBroc from Philadelphia, PA on 6/12/2013
2007 Hummer H3
used in a 2007 Hummer H3, I had someone installed, but i called around for prices for this part. and Crutchfield beat it by $50.00! Just what I needed... and the price was GREAT!
Pros:
Cons:
1 of 1 found this helpful
easy
Crutchfield customer from petersburg va on 6/11/2013
2006 Chevrolet TrailBlazer
1 of 1 found this helpful
GMOS-01 adapter cable
Tom from Albuquerque, NM on 5/9/2013
2005 Chevrolet Tahoe
Bought this to use with my new JVC KD-R740BT in my 2005 Chevy Tahoe. I am an electronic tech so all of the soldering of wires from the new deck cable to the adapter cable went well. Great instructions. Lots of extra bundles of cables to stuff back up into cavities.
Pros: All safety chimes work well. Crutchfield cuts price in half when you buy a deck from them at the same time. Nice deal but still darned expensive for an adapter cable with a small electronic interface box.
Cons: Not all connections were shown in drawing. Had some left over connectors but must not need them because everything is working fine. I would like to know what some of those extras are for. Cost is high.
1 of 1 found this helpful
Harness
Paul from Brandon, MS on 4/29/2013
2006 Chevrolet TrailBlazer
0 of 0 found this helpful
GMOS-01 wiring harness
Clint from Santa Fe, NM on 4/27/2013
2003 Chevrolet TrailBlazer EXT
Fairly simple to install. One 45 second call to Crutchfield had all unused wires noted and the installation simplified.
Pros: Easy to install.
Cons: Instructions are almost perfect.
1 of 1 found this helpful
Does what it's suppose to
Lab4 from Wyoming on 4/18/2013
2005 Chevrolet Colorado
Works like a charm for my '05 Colorado, but creates a mess of a wire harness when you get everything together. I am a bit OCD about trying to keep a clean look for all the wiring I do whether its car audio or home entertainment. it might all be hidden, but a clean install is easier to work on or add to. Even after I took some extra time trying to clean this thing up it still ends up looking like a knot of wire. I know that it is hidden, but it makes it hard to work on things under the dash. The instructions also do not cover the 3.5 male connector that is on one branch of this thing or the second lead on 16pin harness that goes with the new deck harness, but after a call to tech support with this question, which seemed to be a common one they get, I just taped the 3.5 branch outta the way and connected the extra lead together with the other 2.
Pros: Works easy install, as long as you follow the instructions.
Cons: it is a mess of wires
0 of 0 found this helpful
technology is a wonderful thing
Benjamin from Cleveland Ohio on 4/7/2013
2008 GMC Envoy
Using Crutchfield outfit my car app made finding the right part the first time so easy and hassle free. Once I received the part installing the part was not difficult at all. In fact the instruction sheet was barely read. Thanks Crutchfield.
Pros: Very very very easy to understand and install.
Cons: Taking it out of the package was a little rough. My blade wasn't sharp enough. Lol.
1 of 1 found this helpful
GMOS-01
Javier from Yuma, Az on 3/28/2013
Easy Instructions easy to use
Pros: Simple and easy love it
Cons:
0 of 0 found this helpful
Ok Stuff
BrianD from St. Clairsville, OH on 3/8/2013
2004 Pontiac Grand Prix
Not really sure about this one. The adapter is required for my car, 2004 Grand Prix, to still have door chimes.
Pros: Keeps my door chimes working. Assembled on workbench
Cons: Was not an easy install. Kind of confusing, but it is possible to figure out.
2 of 2 found this helpful
2011 Colorado crew can
Kory from Louisiana on 3/4/2013
2011 Chevrolet Colorado
Works great. All factory safety alerts work and sound just like factory. Very easy to wire up.
Pros: You can do all wiring on work bench then plug in the pig tales to factory harness.
Cons:
4 of 4 found this helpful
GM Chimes Adaptor
Bill L from Texas on 2/26/2013
2006 GMC Envoy
This device works as advertised. Connections are a lot more difficult as compared to previous Crutchfield hook ups. I had to make 13 solder connections and blank off numerous wires. Thanks to Crutchfield's tech assistance it was manageable.
Pros: Works well Crutchfield tech support.
Cons: Lots of connections and little instructions.
0 of 0 found this helpful
Worked Perfectly!!
Al B. from Florence, SC on 2/23/2013
2003 Chevrolet TrailBlazer
This adapter was easy to install with perfect instructions for my vehicle and all factory chimes and OnStar worked flawlessly with my new Pioneer FXH-700BT stereo.
Pros: Ease of installation
Cons:
1 of 1 found this helpful
Works great!
Tibor from CA on 1/14/2013
2007 Pontiac Grand Prix
2 of 2 found this helpful
Metra GMOS-01 installed in 2004 Envoy XUV
Stan from Atlanta, GA on 1/3/2013
2004 GMC Envoy XUV
Worked as designed. I selected this unit as I don't have steering wheel controls. Crutchfield adviser pointed me in the right direction to make the proper choice. I installed it in three steps. Matched wires to radio harness and twisted together. Soldered all wires and wrapped with electrical tape. Then neatened up the complete package with tie wraps. Installed in the Envoy with the Radio. Verified everything worked before putting dash and center console back together. One problem is that I should have adjusted the tone volume higher. I didn't take into account the higher radio volume once I started using it. I am an Electronics / computer geek, so I was able to read and understand the instructions / wiring diagram. Would be a little complicated for a person without some technical knowledge and should be left to a pro. The installation is only two weeks old.
Pros: Works as advertised. All functions work.
Cons: Comes with two red wires and had to call Crutchfield to get clarification. Turns out you can use either wire. This isn't in the manual / wiring diagram
2 of 2 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from joliet, IL on 1/2/2013
2005 GMC Canyon
works fine and has pretty good instructions for installation.
Pros:
Cons: for a first time car stereo installer, the instructions left too many things out. I ended up with multiple wires and plugs I wasn't sure what to do with that were left out of the instructions. All I had to do was tape them off and not use them but it still caused some confusion.
0 of 0 found this helpful
GMOS adapter
Allan from Florida on 12/26/2012
i rated this adapter so low because the NASA engineers wouldn't be able to decipher the wiring instructions.
Pros: it works
Cons: wiring instructions the worst i have ever seen
0 of 1 found this helpful
Does the job
Kevin F from Woburn, MA on 12/12/2012
The unit does what it is supposed to do. The door chimes, etc. all still work, as does the speaker. One small minus was that there were two different orange with white strip wires, I connected to the one described in the documentation, and the radio does not automatically dim at night. Don't know if would have worked with the other wire.
Pros: Keeps all of the integrated functions working.
Cons: Either the directions or my reading of them didn't work for dimming illumination.
0 of 1 found this helpful
Works like a charm
Neal S from Suffolk, VA on 8/18/2012
This thing works great. Installed in 03 Avalanche. Ill admit its overpriced and that the instructions are a bit lacking. It already has the wiring for steering wheel controls, all you need is the module, but you have to buy that package separately, or wait till the all-in-one set is in stock at Crutchfield, so you end up with an extra harness you dont use. I did use all the wires attaching to the head unit unlike other reviewers that didnt use them all. I was able to install it without any problems, or phone calls to tech support, and Im a long way from a pro stereo installer. Hopefully it will play well with the other kids, (in motion video bypass and wireless back-up camera when they show up in a few days) it is a lot to try to stuff back into the dash but eventually it fit. Thanks Crutchfield for the great customer service before the sale!
Pros: It works like it is supposed to!!
Cons: overpriced, although I got it for half price buying the Pioneer AVH 2400 BT
1 of 1 found this helpful
more than enough
David s from Elko, NV on 8/7/2012
2005 Chevrolet Colorado
Product works as described, however. If you are not savvy at 12v electrical systems and this is your first stereo you will be lost. there are three parts of this harness, it is not plug and play, there is an optional harness that is not detachable so you have a dozen left over wires including a 12v hot wire that will be floating around under the dash sparking and shorting out all kinds of stuff if you do not secure it properly, not in the instructions, all in all it does what it is supposed to. amatures- get help!!!!
Pros: works as it is supposed to.
Cons: confusing, made for more options and non removable third part of not needed harness
0 of 0 found this helpful
Functions as Described
CC from North Carolina on 7/14/2012
2008 GMC Canyon
I wish I could have bypassed using this thing. I spent more time on figuring this out than I did the rest of my install. Instructions are somewhat vague. Took 3 calls to Crutchfield support to get things figured out but they were awesome and had the answers I needed right away. Each call only took about 5 minutes with no hold time. Props to the support team!!! Also, I did have to wire in a seperate speaker to hear my chimes. I simply used an old PC speaker I found laying around my workshop and it did the job. Unit has a very cheesy way of setting the Onstar volume control by actually shorting a wire to ground to get the setting you want.
Pros: Does what it's supposed to do.
Cons: Seems expensive even at half price. Instructions were vague.
0 of 0 found this helpful
GM Adaptor / OnStar
Mark from Birmingham, AL on 6/29/2012
Excellent piece of equipment. Very intimidating at first glance. Lot of wires, Lots of wires. Tech department offered some very patient and timely advice. Works perfectly but for a small glitch with the Onstar system. The reciever should mute when Onstar comes on. It does not. I must turn the reciever sound down to hear and talk with Onstar. Could be the install but the wires were specifically labled. No big deal.
Pros:
Cons:
1 of 1 found this helpful
GM Factory Integration Adapter
Mark G from NY on 6/17/2012
2005 Pontiac Grand Prix
I did not like this product. I could not figure out how to install it and did not use it.
Pros:
Cons:
0 of 3 found this helpful
Overpriced Installation Accessory
ElvinK from East Bank,WV on 6/3/2012
2008 Pontiac Grand Prix
Car manufacturs have ripped us off on the requirements to replace a factory radio. Plus the aftermarket manufactures have come in like vultures to price gouge. There is absolutely no reason why it should cost this much for this adapter (even at half price it is a little steep for no more than what it is). Plus it is not very reliable. For some reason, I have to unplug my connectors at the box and reconnect them to get it to work again. Does this randomly and cant figure it out.
Pros: Connects to factory wiring. Eases radio install.
Cons: Expensive. Unreliable.
3 of 3 found this helpful
2002 Trailblazer
Dennis from New Jersey on 5/27/2012
Great product, looks more complicated then it is. Installed in my 2002 Trailblazer and it did exactly what it was suppose to do.
Pros:
Cons:
1 of 1 found this helpful
Poor instructions but great service!
Ben from Raleigh, NC on 5/5/2012
Product works great. Instructions were pretty bad, and I had to call customer service twice to find out what to do with wires that were not addressed by the instructions. Customer Service was terrific and walked me through the wiring. Worked perfectly when I plugged it into the stereo.
Pros: Works Great. Great customer Service
Cons: Bad instructions
0 of 0 found this helpful
Works well in my Colorado
Bill from Jamestown, NY on 4/2/2012
2008 Chevrolet Colorado
This should be free with the GM installation kit. The instructions were too technical, I ended up matching the colors of my GM harness and stereo then looking to see what was left. If you don't read the instructions, you could end up leaving a couple wires intact that you need to cut. At the end of the day - it worked, but its nothing to get excited about and is too expensive for what it is.
Pros: Keep your chimes and On Star
Cons: Expensive Poor instructions Extra wires left over that you don't use - the instructions don't tell you what they are for and that they may not be used Requires you to have a little more than common sense to hook up
0 of 1 found this helpful
A must have for applicable vehicles
defkon77 from norton, ohio on 4/2/2012
2009 GMC Canyon
I work on GM cars and understand how important this item is for A/M head units.....this installed easy,kept my vehicle like factory(retains RAP,uses door speaker chime, kept OnStar working like factory)....just before i bought this item I bought one from another retailer for twice the price( uses its on speaker and did not keep OnStar)....it was $90!!!...I returned it and bought this item instead
Pros: retains factory functions.....this imporant for safety and for any installer that cares about not being a "hack" when installing radios.
Cons: NONE!!!!
5 of 5 found this helpful
Fine
AznHammer from Winston Salem NC on 3/3/2012
2006 Hummer H3
Work great, and good price with for the on-star integration. It sucks that GM requires it, but the product works fine. As far as actual issues below talking about pops/chimes not working correctly, I wonder how much of that is an install problem. All my chimes are working as expected.
Pros: Cheapest one I've seen with on-star
Cons: I don't care of the new door chime sound.
2 of 2 found this helpful
Metra GMOS-01 Wiring Interface
capnrobi from Tampa FL on 2/12/2012
2008 Chevrolet TrailBlazer
I wonder if it was really necessary. My truck never had OnStar
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2 of 2 found this helpful
Mostly works
AB from Rocky Mount, NC on 2/4/2012
2008 Chevrolet Colorado
Installed in a 2008 Colorado and although most chimes work the way they used to, not all work.
Pros: Easy to install.
Cons: Not all chimes work correctly.
0 of 0 found this helpful
A necessary evil
Crutchfield customer from Greenville SC on 1/31/2012
2007 Hummer H3
I hated the thought of spending the extra hundred bucks for this product, but the 50% off with head unit purchase made it palatable. Product works as described when installed properly. Do the splicing work on the bench, rather than in-car. Then, it's just plug-n-play when you go to mount it in the vehicle. The instruction set is minimal but it has all the necessary information.
Pros: Works as described.
Cons: Expensive but necessary.
2 of 2 found this helpful
adapter
j g from ft riley ks on 1/24/2012
2005 Chevrolet TrailBlazer EXT
0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
ToddG from Potterville, MI on 1/19/2012
This item had one glaring problem when used with a 2008 Pontiac Grand Prix: The GMOS-1 would cause the driver's door speaker to make a loud, electrical 'pop' sound everytime you inserted the key into the ignition... or, if the key was in the ignition and you opened the door. It had to do with the GMOS-1 "Chime" function. I switched to the GM VT_GMRC-O1 instead, which has it's own built in 'factory style' chime speaker and then it worked flawlessly. I recommend using the GMRC-01 for this year/make of car. I did not have the Monsoon factory radio setup.... just the standard, run of the mill factory radio which I replaced with a JVC KWHDR720.
Pros: Everything worked great.... EXCEPT.... THE CHIME FUNCTION CREATED A STATIC/POP sound when key was inserted into ignition.
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2 of 2 found this helpful
Major Headache
Crutchfield customer from Oklahoma City, OK on 12/17/2011
2007 Chevrolet TrailBlazer
1. Comes prewired with an additional connector and 3.5mm plug that the directions/pictures don't even address. 2. Lots of wires (not a big deal), throw in less than stellar directions, and you're left wondering. 3. Installation was pretty straight forward, thought I was good to go, worked perfect, until I came out to a dead battery the next day. Traced the problem to this unit feeding constant 12V power to the ACC wire. So the radio was always on. Yes, I double checked my wiring and everything was done according to the directions. The radio receives constant 12V direct from factor harness, but relies on the GMOS01 for the ACC 12V, so the problems was defiantly the unit.
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1 of 1 found this helpful
Don't Over Think It
ag from Charleston, SC on 11/27/2011
2003 GMC Envoy
If a colorblind 22 year old can figure it out working out of the back of his SUV, at night, under a street light, anyone can. Yeah, it's a lot of wires and different colors, but if you match up exactly as the directions say and ignore the wires you don't use, you should be fine.
Pros: works well
Cons: a little confusing
1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
chasjake from Cortland, Ohio on 10/6/2011
2011 Chevrolet Colorado
Used this on a new stereo install in a 2011 Colorado. It works well. The wiring directions / diagram are a little tough to follow but I made it through. The chime is a little more sterile sounding that the factory chimes but who really cares.
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0 of 0 found this helpful
Unorganized and Bulky!
JasonK from Kankakee, IL on 10/6/2011
2011 Chevrolet Colorado
This thing is the most unorganized wiring harness I've ever seen! I took it out of the box and read the instructions for about 45 minutes trying to figure out where the extra black 12pin connector plugged into and the 3.5mm Male. Finally had to call Crutchfield and apparently its for a steering wheel control that's NOT EVEN MENTIONED ONCE in the instructions! Not to mention this thing is HUGE and I have a mid-size truck. Try fitting that in the dash!
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1 of 1 found this helpful
Just as advertised
Johnson from Charleston,. SC on 8/30/2011
Pay attention to the directions and you'll be fine. Lots of wires, but easy to bundle together once all are connected. Made all the connections at the dining room table prior to installation and everything worked as described. Made the after market radio a seamless transition. Didn't need the On Star or amplifier options, so can't comment on them.
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1 of 1 found this helpful
Directions are Confusing
JackR from Pittsburgh, PA on 8/6/2011
2006 Pontiac Grand Prix
READ INSTRUCTIONS CAREFULLY!!! They are very confusing, color codes on wiring are duplicated, and some additional explanation would have been helpful. Had to call Crutchfield twice to get it all figured out. Also the unit is quite big and you will need to find a location to put the box so it does not interfer with the radio and wiring. There has to be a simpler way to retain the factory chimes, but after all that, it does work well.
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1 of 1 found this helpful
works
Cory from Eugene, OR on 7/18/2011
2007 Pontiac Grand Prix
works as advertised, maintains all factory features in my 2007 Grand Prix
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2 of 2 found this helpful
ok but not great.
ivanE from Grand Rapids, MI on 7/2/2011
my stereo stays on untill i open the door, the chime work but you must have the aftermarket unit on if you remove the stereos faceplate it will no longer work. when hitting the onstar button the music won't go mute, thats something the factory unit used to do. I have installed a scosche one in a monte carlo 2001 and the chime works even if you remove the stereos face plate.
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0 of 0 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from TAMPA FL. on 6/9/2011
1 of 1 found this helpful
2007 TrailBlazer w/o OnStar
stress from Pittsburgh, PA on 6/6/2011
2007 Chevrolet TrailBlazer
The device does exactly what it was designed to do. The installation was easy, even for someone who never messes with vehicle electronics. Don't forget that you'll need to buy some wire connectors and electrical tape! As for the tone, it honestly sounds just like the GM tone from the 80's. It's truly nothing bad -- and very easy to get used to.
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2 of 2 found this helpful
OnStar adapter
Donnie from Vineland, NJ on 4/19/2011
Dont let all the wires scare you. It is & was a very easy install. At least on my Envoy it was. Tone takes a little getting used to, but not anoying
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1 of 1 found this helpful
Overpriced But Works Flawless
Sundown from Upstate, NY on 3/28/2011
2008 Hummer H3
Wiring was extremely simple and took little to no time other then soldering. Once wired up, just plug it into the radio and factory harness and you are good to go. Still have OnStar, door chimes, and seatbelt chimes. Back up, park/parking brake and vehicle speed sensor are a big plus for installing a DVD, navigation or backup camera. I will say this item is EXTREMELY overpriced (half this price would be much more reasonable but thats what Crutchfield charges with a receiver purchase anways) and the quality is just good not great but it serves its purpose and works flawless. Review is based on a 2008 Hummer H3.
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3 of 3 found this helpful
Like a SNAP!
Brian from Virginia on 3/27/2011
2008 Chevrolet Colorado
Been some years since I changed an aftermarket stereo. I was going to pay and have it done for me, but a co-worker suggested Crutchfield. Not only did they walk me through what I needed, but the installation of this item was easier than you could imagine. Nowadays with electronics and the conglomeration of wires - IT CAN GET DISCOURAGING. It came with detailed instructions with the product and from Crutchfield - It was a piece of cake!
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3 of 3 found this helpful
Better than the old ones
txplshrk from Corpus Christi TX on 3/14/2011
2008 Chevrolet Uplander
This one works a lot better than the old adapters. I had one just like this that sounded horrible, ever since they changed the design on this it seems to work better. Wiring connections are spot on and easy to follow. Be careful on how high you turn up the volume knob on this thing! Man it gets really loud.
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1 of 1 found this helpful
work well
hope from chicago on 2/24/2011
this unit work well. was very easy to install and i have no problem with it
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1 of 1 found this helpful
It's like I never switched out my old OEM stereo
EvansB from Arizona on 2/24/2011
2005 GMC Envoy
Bought this bad boy and was able to still hear my On Star and my Seat Beat/Door Open chimes. All I had to do was follow the instructions to turn up the volume on the OnStar audio.
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2 of 2 found this helpful
Metra GMOS-01 Wiring Interface
Robert P from Phoenix, AZ on 2/6/2011
I used this kit to install a Clarion CD Receiver that I removed from another car. I am glad I saved the original wiring instructions from Crutchfield from the first installation. Soldering together all the wires was very time consuming but the wiring diagrams were easy to follow. I was amazed that red wire connected to red and blue to blue.....All the wire colors from the old Clarion matched this new kit. After installation, all chimes and warnings work just fine. I usually don't have this much luck on the first try.
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0 of 0 found this helpful
Super Easy Install and Great Instructions
Deb from Hillsborough, NC on 1/31/2011
2008 Chevrolet Colorado
The kit made the install really easy with detailed instructions. My dad is an electrician and watched me install. The instructions even addressed the function of the wires that are not used so when he asked me why I didn't use them I could point out they were for the back speakers we didn't have or if the radio had nav built in.
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2 of 2 found this helpful
What a piece of junk!
Dirk C from Ellendale, ND on 10/9/2010
2002 Chevrolet Impala
Some of the wires had to be added on to, some of the wires were mismarked on the wires compared to what the documentation said. The documentation was contradictory. And worst of all, it just doesn't work. It doesn't chime, it cuts out the left speakers when error messages flash across the dashboard. The speed sensitive volume control doesn't work as advertised.
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0 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Derrick T from Fairview Heights, Il on 9/30/2010
I believe this module is really over priced and the instructions could be more detailed, but if you take your time, the average person can hook this module up. The main reason I purchased this module was to keep the warning chimes. Prior to installation in the dash, I turned the volume screw clockwise and counter clockwise and I still have not heard a chime yet. Other than that I guess it does what it suppose to do. After soldering all of those connections, I refuse to cut the wires and return it because of the warning chimes and waiting a week to 10 days for a replacement. Since I only paid half price and I was told this was not an optional part I guess I would recommend this to a friend but I would check it out complete before making all the final connections
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0 of 0 found this helpful
Great product
Bob B from Seaford VA on 8/22/2010
2010 GMC Canyon
Outstanding product. Somewhat complicated to install but that's due to GMs complicated system, not the adapter. If you read the instructions carefully and apply some common sense it drops right in. Put this into a 2010 canyon WT worked 1st try. On-star didn't detect a thing - thinks the factory radio is still in it and all the On-star functions work perfectly.
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1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
Crutchfield customer from Delaware on 8/18/2010
Worked great! Strait forward... Everything functions as it should, and the door chime is now a different tone, less annoying than the stock!
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0 of 0 found this helpful
as advertised
Benny from Kansas City, MO on 6/15/2010
2008 Pontiac Grand Prix
This product works as advertised. The chimes were a little different than I was used to, but after a few weeks I don't think they are worse than the stock. Do test the chime loudness and adjust before putting the dash back together! The install was tedious due to the number of connections required (between 15-20 or so). Also, the instructions weren't exactly 100% clear at times, but I was able to figure it out once I started and got oriented with their wording. Once installed per the directions, it was simple to plug in and everything worked. It did take some creative positioning of all of the wires and the GMOS to get everything to fit, but it wasn't too difficult. All in all, this product really made installing an aftermarket head unit (CD Player) easy and trouble free. My antenna wasn't working quite right but Crutchfield's tech support was able to diagnose the problem, which was to connect all of the remote wires as directed by the instructions. Once that was performed, my radio reception was restored.
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3 of 3 found this helpful
Skeptical
Angel from Chesapeake, VA on 5/3/2010
2003 Chevrolet TrailBlazer
When I first took this out of the box I was overwhelmed. So many wires and instructions. But it honestly wasn't that bad. Through the entire thing I only misconnected one wire (mute), and once I cut the wire the unit worked fine. It's been installed for two weeks, and it seems to be doing fine. My door chimes still don't work like they used to, but they do work. Just wish it wasn't necessary, that's a good chunk of change to lay on it.
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0 of 0 found this helpful
Wroks well, questionable quality
Crutchfield customer from Rochester, NY on 4/11/2010
2006 Pontiac Grand Prix
Once I got a unit that actually functioned, I found that it worked fine and supported all of the GM options that my car (2006 Grand Prix) had installed. The first unit shipped to me just did not work. Crutchfields's excellent phone support guys helped me determine this and they sent a new new one right away. This unit also had wires falling out of the connector - subpar build quality. The instructions are also fairly confusing although usable. I image that a novice would have a hard time with this. Crutchfield might save some support costs if they provided improved instructions for wiring up this unit.
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0 of 0 found this helpful
Works Nicely
twenty4pack from Niceville, Florida on 9/20/2009
2003 Chevrolet Silverado 1500
The device works well, but the instructions were a bit confusing even though the wires were individually labeled. I bought it to work with a JVC KDA605 and my 2003 Silverado, and it does that almost perfectly. Single stepping through the instructions, I finally had everything soldered and insulated with heat shrink tubing. Surprised me the installation worked first time, and it's nice to have a door chime that's subdued. Only thing that bothers me is the instructions specified that the dimmer circuit would not work with my truck, even though the wires were available both coming from the OEM harness, the radio, and this adapter. I have not investigated further, having the display dim with the dash lights would be nice, but not worth the chance of destroying something.
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0 of 0 found this helpful
IT WORKS!!!
Lee from Wichita, KS on 9/3/2009
2006 Pontiac Grand Prix
the instructions only include a wiring diagram for the amp and head unit installation. there is no diagram for the head unit only. i called cruthfield tech advisor 3 times for help and they had all the right answers. crutchfield tech support is the best. some of the wires are labeled the same, but serve different functions, which is where i got confused. cruthfield's tech advisors had me hook up the the amp wires even though i don't have an amp, because i have an amplified antenna in my son's 2006 pontiac grand prix. the instructions that come with the unit don't mention this, but crutchfield's tech guys were right. most everything works like a charm, except for the steering wheel controls no longer working. probably because my head unit doesn't support this feature, i guess. i wasn't sure i was going to have room for the GMOS behind the dash, but i had plenty. be sure to adjust your chime and onstar volumes before you put the dash back together, because they are on the GMOS unit. i had to cap off a few unused wires and the the harness connections fit perfectly. works great and my son loves his new stereo. kudos to crutchfield and there top of the line tech support.
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2 of 2 found this helpful
"Retains On Star" not accurate
Crutchfield customer from Xenia, OH on 8/29/2009
2008 Hummer H3
All works great, EXCEPT On Star part. After wiring, I could not make a call by hitting phone button on mirror. To me this is part of ON Star, but according to Metra, not really. They say I should be able to talk to ON Star advisor, but not make a phone call?!?!? The car is not home now, so cannot test veracity of reps' information. Had I known this to be the case, I would not have bought after market head unit. Now stuck.
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0 of 0 found this helpful
Low quality
Douglas from Seattle, WA on 6/29/2009
2008 Pontiac Grand Prix
When I first opened the package, two wires fell out of the 14-pin harness. Not all of the wires from the factory plug run through the box, you will need to make connections from the radio harness straight to the factory harness. Pretty cheap design IMHO. I also had no luck with the mute wire(constantly muted when connected) and the dimmer wire doesn't work either, at least for my car(08 grand prix). The unit does retain the chimes(they are actually new chimes built into the GM0S-1) and the RAP feature.
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0 of 1 found this helpful
works good- a lot of wires though
jasonv from phoenix, az on 4/23/2009
i made the mistake of hooking up all the brown 'mute' wires together and the 'att' (attention- its not the mute mode but it lowers the volumne way down) mode would keep coming on automatically. i am pretty good with wiring stuff and the directions are goofy so it took me awhile to figure it out. not sure why i wired them all together but just thought i'd throw that out there in case someone hooked up the wrong mute wire and can't get theirs to work right. it works for 2 different plugs so there are a lot of extra wires that weren't need for my '04 gmc canyon with no cd changer but with onstar.
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1 of 1 found this helpful
product quality
Bryan from Jacksonville FL on 3/9/2009
2009 Chevrolet Colorado
the product quality over all is all right, the wiring schematic for an aftermarket stereo is strange i even called customer support and they did not have a schematic in there data base. All was eventually figured out with some confusion. the mute wire i had to cut b/c the gmos would not turn it off, now when onstar kicks on it shuts the radio off. the harness doesn't have pig tales for the rear speakers so you have to by pass the box to go straight to the factory adapter plug. with every thing finally wired up i plugged it in to the factory harness and the ground pin came out of the plug, thankfully i was able to lock the pin back in place. i guess it would be nice to have a harness i didn't have to bypass, or have it fall apart as i plug it in.
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2 of 2 found this helpful
Metra GMOS-01 Wiring Interface
Ian from Lake Charles, Louisiana on 2/15/2009
2006 GMC Yukon XL
Did exactly what I wanted it to do. It was easy to install, but I wish it would automatically dim the screen when the lights are turned on.
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1 of 1 found this helpful
not everything i expected...
kamaha`o from Maui, HI on 2/10/2009
This product does not operate exactly the way I imagined it would. I rate it a two because I like that the radio remains on in my car until I open the door, and the onstar works, but the chime is not the same and the dim feature does not work at night. I need to manually adjust my screen. The biggest problem I have with this unit is the chime because it stops sound from the radio coming out of the front left speaker to do the chime. Before, the radio would continue playing music and the chime would be audible at the same time. They said this was a very important part, which I agree it is, but I hope they can improve it in the future to work seamlessly. Installation guide was clear and although the many wires seemed intimidating at first, it was a breeze to get the job done.
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4 of 5 found this helpful
For the novice installer
Granzow from Fort Wayne, IN on 2/8/2009
2004 Chevrolet TrailBlazer
I installed this on a 2004 Chevy Trailblazer with OnStar without Bose system. It's truly a plug-in and play device. The color-coded wires matched perfectly with my Kenwood DNX5120 Navigation radio. The DVD player works just fine. If you are thinking of installing yourself, don't be afraid because it is much easier than it looks.
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5 of 5 found this helpful
Nice little box
O.V from Colorado on 1/29/2009
2007 GMC Envoy
Easy to hook up but will add a lot of wires so be sure you have the room. I upgraded the factory radio in my 2007 Envoy with a Kenwood KVT-512 head unit. I installed the GMOS-01 to keep the factory chimes. The only problem I have is it wont automaticly dim the screen when the headlights are turned on but I can still manually dim the screen. I also installed the Kenwood KNA-G510 navigation system and it won't dim automaticly or manually. The navigation screen is way too bright at night.
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1 of 1 found this helpful
Metra GMOS-01 Wiring Interface
robert from Caldwell, ID on 4/11/2008
2008 GMC Canyon
Wow this was so easy to put in. Having the two volume controls is nice because my factory door tone was way to loud and I also toned down the Onstar voice, "Donna was just to loud"
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3 of 3 found this helpful
A Big Box
Jeffrey from San Diego, CA on 3/5/2008
This unit is easy to install and hook up. It is however rather large and some may have to really work at getting this to fit way back in the dash panel. ADVICE- The sound adjustments are on the box. Test and adjust the chime and Onstar sound levels BEFORE you finish the install, unless you like removing your head unit.
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5 of 5 found this helpful
DESPARATELY HAPPY
Crutchfield customer from Clifton VA on 2/27/2008
I was crushed that there was no GM way to hook up. My son scanned and found the device. He had a list and I made the choice of you guys because I trust you. I do not even remember considering the price difference although my son tried to push "cheap" as a choice. I prefer trust. Most excellent to have both HD and OnStar. Thanks, guys.
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2 of 2 found this helpful
Does what needs done
Josh from Columbus, OH on 8/17/2007
2007 Chevrolet TrailBlazer
Purchased the Metra GMOS-01 Aug 5th & it was on my door step Aug 7th. Installed it Aug 8th and it works like a charm! Easy, straight-forward installation, truely is "plug n' play". The reason I only give it 4 of 5 stars is that OnStar only gets 3 volume setting now and to adjust you have to be able to get to the unit (which is behind the HU in the dash). Also the door chimes are super loud but can be adjusted at the unit, again, BEHIND the HU in the dash. All n' all, a GREAT product at a GREAT price!!
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5 of 8 found this helpful
Metra GMOS-01 Wiring Interface
Rick from new windsor ny on 5/13/2007
2002 Chevrolet TrailBlazer
easy plug and play product....works well follow all instructions word by word and you wont have an issue.
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23 of 27 found this helpful
More details on the Metra GMOS-01 Wiring Interface
Product Research
Features
Overview: The GMOS-01 lets you install an aftermarket receiver in select late model GM vehicles without losing the OnStar Emergency Services features or the chime that warns the door is open. Please check the Crutchfield Vehicle Selector to confirm compatibility with your vehicle.
Note: This adapter is not compatible with factory Bose or Monsoon systems.
Connections: The module includes a 10-pin harness (5 pins used) that connects to the switched power and front speaker leads of the new radio. A second harness (12-pin, 10 used) connects the module to the factory OnStar and radio plugs, plus the rest of the wiring for the new radio.
OEM Steering Wheel Control Compatible (optional): The GMOS-01 features a right-angle 3.5mm connector that lets you keep your GM vehicle's OEM steering wheel controls via the optional Axxess Steering Wheel Control Interface (120ASWC1, sold separately).
Volume: The volume is adjustable for both the OnStar output and the warning chime.
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