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Metra GMOS-01 Wiring Interface

Connect a new car stereo and retain OnStar®, factory door chimes, and audible safety warnings in select GM vehicles

Save with a compatible car stereo with a compatible car stereo
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Our take on the Metra GMOS-01 Wiring Interface

by Ken Nail

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.

Read more

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.

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so, then check here for a list of parts. You can also call an Advisor for more information.

Hands-on research from the Crutchfield Labs (what are the Labs?)

Product Research
What's in the box?

Download 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

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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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Metra GMOS-01 Wiring Interface Reviews

Average Customer Review:

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Filter by rating:
2 out of 5

What was this for?

Written By mmaxon888, Fort Calhoun, NE on Wednesday, October 15, 2014
Crutchfield Customer Review (What's this?)
 
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.
Crutchfield response on Tuesday, October 21, 2014
Our Tech Support team helped clarify why the customer needed the GMOS-01 and helped him get the other feature he wanted (to retain his steering wheel controls) by adding the ASWC-1 adapter. The customer reports that he is completely happy with his new gear and found our service to be very helpful.
Was this review helpful?    Yes | No
 
4 out of 5

Metra GMOS-01 Wiring Interface

Written By DennisK, Mendon, MA on Sunday, October 12, 2014
Crutchfield Customer Review (What's this?)
 
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.
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5 out of 5

Works as advertised

Written By Tom N., Dillsburg PA on Tuesday, September 02, 2014
Crutchfield Customer Review (What's this?)
 
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
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5 out of 5

wiring

Written By jim, Portsmouth, Va on Thursday, August 28, 2014
Crutchfield Customer Review (What's this?)
 
very easy to install and a great time saver
Cons:
none
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4 out of 5

Metra GMOS-01 Wiring Interface

Written By Anonymous, Bedford, OH on Tuesday, August 19, 2014
Crutchfield Customer Review (What's this?)
 
Does what it says keep all factor options
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5 out of 5

metra gmos 01 factory intigration adapter

Written By cris f., hamilton,oh on Monday, June 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
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5 out of 5

Metra GMOS-01 Factory Integration Adapter

Written By Tim, Aurora, CO on Friday, June 20, 2014
Crutchfield Customer Review (What's this?)
 
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.
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5 out of 5

Metra GMOS-01 Factory Integration Adapter

Written By MikeO, Denver, CO on Sunday, May 18, 2014
Crutchfield Customer Review (What's this?)
 
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.
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4 out of 5

Metra GMOS-01 Wiring Interface

Written By Anonymous, Cumming, GA on Wednesday, April 30, 2014
Crutchfield Customer Review (What's this?)
 
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.
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2 out of 5

OnStar interface

Written By Tom J, Newington, CT on Sunday, April 06, 2014
Crutchfield Customer Review (What's this?)
 
I still do not have an AM antenna working
Pros:
Works for interface
Cons:
Incomplete instructions, can't get AM radio antenna to work.
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5 out of 5

Good harness

Written By Zeke, Sun Prairie, WI on Friday, April 04, 2014
Crutchfield Customer Review (What's this?)
 
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
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5 out of 5

works great

Written By Julzee, Pittsburgh PA on Monday, March 31, 2014
Crutchfield Customer Review (What's this?)
 
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
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4 out of 5

Great product

Written By Anonymous, lagrange ky on Saturday, March 15, 2014
Crutchfield Customer Review (What's this?)
 
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
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4 out of 5

Metra GMOS-01 Wiring Interface

Written By 2007trailblzr, Yadkinville, NC on Monday, March 10, 2014
Crutchfield Customer Review (What's this?)
 
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.
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4 out of 5

Take your time and this will work.

Written By RSS, Benton.Ar on Monday, February 17, 2014
 
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.
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5 out of 5

Does what it says

Written By Chris M, Collegeville, PA on Thursday, February 06, 2014
Crutchfield Customer Review (What's this?)
 
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.
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5 out of 5

Metra GMOS-01 Wiring Interface

Written By John O, Houston TX on Friday, January 10, 2014
Crutchfield Customer Review (What's this?)
 
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
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4 out of 5

Metra GMOS-01 Wiring Interface

Written By kyle, monroe Tennessee on Sunday, January 05, 2014
Crutchfield Customer Review (What's this?)
 
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.
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3 out of 5

Confusing, but works

Written By BobF, New Orleans on Sunday, December 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.
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3 out of 5

I've seen better

Written By ZeeB, Manchester, NH on Thursday, December 12, 2013
Crutchfield Customer Review (What's this?)
 
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.
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5 out of 5

Keeping the Chimes alive

Written By Chris, Olathe, KS on Friday, November 22, 2013
Crutchfield Customer Review (What's this?)
 
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.
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5 out of 5

Does the job!

Written By DJ, Columbia, SC on Tuesday, October 01, 2013
Crutchfield Customer Review (What's this?)
 
All the alarms and sounds were retained. That's what it is supposed to do.
Pros:
Works well.
Cons:
none
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5 out of 5

Great Product

Written By DarrenG, Nebraska on Tuesday, October 01, 2013
Crutchfield Customer Review (What's this?)
 
Easy install, works as advertised.
Pros:
Adjustable chime volume.
Cons:
None
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4 out of 5

Works as promised.

Written By Bob W, Shrewsbury, MA on Tuesday, October 01, 2013
Crutchfield Customer Review (What's this?)
 
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.
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5 out of 5

Review for the Metra GMOS-01

Written By Rich, Somers, NY on Tuesday, September 24, 2013
Crutchfield Customer Review (What's this?)
 
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
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1 out of 5

You get what you pay for

Written By Josh, Michigan on Saturday, August 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 out of 2 people found this helpful
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5 out of 5

Great for price.

Written By Joeh24, Dallas tx on Monday, August 12, 2013
Crutchfield Customer Review (What's this?)
 
For the price it's a great deal. 50% off with buying stereo.
Pros:
Chimes volume adjustment,on star adjustment.
Cons:
None
1 out of 1 people found this helpful
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4 out of 5

First one died secound one worked...

Written By Dave C, Currituck, NC on Friday, August 02, 2013
Crutchfield Customer Review (What's this?)
 
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 out of 1 people found this helpful
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1 out of 5

Worked for awhile

Written By Tim, PortOrchard , WA on Wednesday, July 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
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5 out of 5

Top Notch Product

Written By Phil, Fresno, CA on Tuesday, July 09, 2013
Crutchfield Customer Review (What's this?)
 
Adapter works very well with new receiver and factory equipment.
Pros:
Good price, with receiver purchase.
Cons:
None
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4 out of 5

GMOS-01

Written By Jeff, Houston,TX on Monday, July 08, 2013
Crutchfield Customer Review (What's this?)
 
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
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2 out of 5

GMOS-01 Unreliable

Written By kn, Atlantic. City on Sunday, July 07, 2013
Crutchfield Customer Review (What's this?)
 
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.
2 out of 2 people found this helpful
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5 out of 5

GMOS-01 Factory Integration Adapter

Written By JBroc, Philadelphia, PA on Wednesday, June 12, 2013
Crutchfield Customer Review (What's this?)
 
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!
1 out of 1 people found this helpful
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5 out of 5

easy

Written By Anonymous, petersburg va on Tuesday, June 11, 2013
Crutchfield Customer Review (What's this?)
 
I install my self is easy
1 out of 1 people found this helpful
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4 out of 5

GMOS-01 adapter cable

Written By Tom, Albuquerque, NM on Thursday, May 09, 2013
Crutchfield Customer Review (What's this?)
 
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 out of 1 people found this helpful
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5 out of 5

Harness

Written By Paul, Brandon, MS on Monday, April 29, 2013
Crutchfield Customer Review (What's this?)
 
Worked as needed
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5 out of 5

GMOS-01 wiring harness

Written By Clint, Santa Fe, NM on Saturday, April 27, 2013
Crutchfield Customer Review (What's this?)
 
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 out of 1 people found this helpful
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3 out of 5

Does what it's suppose to

Written By Lab4, Wyoming on Thursday, April 18, 2013
Crutchfield Customer Review (What's this?)
 
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
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5 out of 5

technology is a wonderful thing

Written By Benjamin, Cleveland Ohio on Sunday, April 07, 2013
Crutchfield Customer Review (What's this?)
 
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 out of 1 people found this helpful
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5 out of 5

GMOS-01

Written By Javier, Yuma, Az on Thursday, March 28, 2013
Crutchfield Customer Review (What's this?)
 
Easy Instructions easy to use
Pros:
Simple and easy love it
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3 out of 5

Ok Stuff

Written By BrianD, St. Clairsville, OH on Friday, March 08, 2013
Crutchfield Customer Review (What's this?)
 
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 out of 2 people found this helpful
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5 out of 5

2011 Colorado crew can

Written By Kory, Louisiana on Monday, March 04, 2013
Crutchfield Customer Review (What's this?)
 
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.
3 out of 3 people found this helpful
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4 out of 5

GM Chimes Adaptor

Written By Bill L, Texas on Tuesday, February 26, 2013
Crutchfield Customer Review (What's this?)
 
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.
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5 out of 5

Worked Perfectly!!

Written By Al B., Florence, SC on Saturday, February 23, 2013
Crutchfield Customer Review (What's this?)
 
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
1 out of 1 people found this helpful
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5 out of 5

Works great!

Written By Tibor, CA on Monday, January 14, 2013
Crutchfield Customer Review (What's this?)
 
Works as it is supposed to.
2 out of 2 people found this helpful
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5 out of 5

Metra GMOS-01 installed in 2004 Envoy XUV

Written By Stan, Atlanta, GA on Thursday, January 03, 2013
Crutchfield Customer Review (What's this?)
 
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 out of 2 people found this helpful
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3 out of 5

Metra GMOS-01 Wiring Interface

Written By Anonymous, joliet, IL on Wednesday, January 02, 2013
Crutchfield Customer Review (What's this?)
 
works fine and has pretty good instructions for installation.
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.
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1 out of 5

GMOS adapter

Written By Allan, Florida on Wednesday, December 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
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4 out of 5

Does the job

Written By Kevin F, Woburn, MA on Wednesday, December 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.
Crutchfield response on Tuesday, December 18, 2012
We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.
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5 out of 5

Works like a charm

Written By Neal S, Suffolk, VA on Saturday, August 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 out of 1 people found this helpful
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3 out of 5

more than enough

Written By David s, Elko, NV on Tuesday, August 07, 2012
Crutchfield Customer Review (What's this?)
 
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
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3 out of 5

Functions as Described

Written By CC, North Carolina on Saturday, July 14, 2012
Crutchfield Customer Review (What's this?)
 
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.
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5 out of 5

GM Adaptor / OnStar

Written By Mark, Birmingham, AL on Friday, June 29, 2012
Crutchfield Customer Review (What's this?)
 
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.
1 out of 1 people found this helpful
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1 out of 5

GM Factory Integration Adapter

Written By Mark G, NY on Sunday, June 17, 2012
Crutchfield Customer Review (What's this?)
 
I did not like this product. I could not figure out how to install it and did not use it.
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2 out of 5

Overpriced Installation Accessory

Written By ElvinK, East Bank,WV on Sunday, June 03, 2012
Crutchfield Customer Review (What's this?)
 
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.
Crutchfield response on Wednesday, June 06, 2012
We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.
3 out of 3 people found this helpful
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4 out of 5

2002 Trailblazer

Written By Dennis, New Jersey on Sunday, May 27, 2012
Crutchfield Customer Review (What's this?)
 
Great product, looks more complicated then it is. Installed in my 2002 Trailblazer and it did exactly what it was suppose to do.
1 out of 1 people found this helpful
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4 out of 5

Poor instructions but great service!

Written By Ben, Raleigh, NC on Saturday, May 05, 2012
Crutchfield Customer Review (What's this?)
 
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
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4 out of 5

Works well in my Colorado

Written By Bill, Jamestown, NY on Monday, April 02, 2012
Crutchfield Customer Review (What's this?)
 
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
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5 out of 5

A must have for applicable vehicles

Written By defkon77, norton, ohio on Monday, April 02, 2012
Crutchfield Customer Review (What's this?)
 
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 out of 5 people found this helpful
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5 out of 5

Fine

Written By AznHammer, Winston Salem NC on Saturday, March 03, 2012
Crutchfield Customer Review (What's this?)
 
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 out of 2 people found this helpful
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5 out of 5

Metra GMOS-01 Wiring Interface

Written By capnrobi, Tampa FL on Sunday, February 12, 2012
Crutchfield Customer Review (What's this?)
 
I wonder if it was really necessary. My truck never had OnStar
2 out of 2 people found this helpful
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3 out of 5

Mostly works

Written By AB, Rocky Mount, NC on Saturday, February 04, 2012
Crutchfield Customer Review (What's this?)
 
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.
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3 out of 5

A necessary evil

Written By Anonymous, Greenville SC on Tuesday, January 31, 2012
Crutchfield Customer Review (What's this?)
 
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 out of 2 people found this helpful
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4 out of 5

adapter

Written By j g, ft riley ks on Tuesday, January 24, 2012
Crutchfield Customer Review (What's this?)
 
great price, need to have product
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2 out of 5

Metra GMOS-01 Wiring Interface

Written By ToddG, Potterville, MI on Thursday, January 19, 2012
Crutchfield Customer Review (What's this?)
 
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.
2 out of 2 people found this helpful
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1 out of 5

Major Headache

Written By Anonymous, Oklahoma City, OK on Saturday, December 17, 2011
Crutchfield Customer Review (What's this?)
 
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.


1 out of 1 people found this helpful
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4 out of 5

Don't Over Think It

Written By ag, Charleston, SC on Sunday, November 27, 2011
Crutchfield Customer Review (What's this?)
 
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 out of 1 people found this helpful
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4 out of 5

Metra GMOS-01 Wiring Interface

Written By chasjake, Cortland, Ohio on Thursday, October 06, 2011
Crutchfield Customer Review (What's this?)
 
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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2 out of 5

Unorganized and Bulky!

Written By JasonK, Kankakee, IL on Thursday, October 06, 2011
Crutchfield Customer Review (What's this?)
 
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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5 out of 5

Just as advertised

Written By Johnson, Charleston,. SC on Tuesday, August 30, 2011
Crutchfield Customer Review (What's this?)
 
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.
1 out of 1 people found this helpful
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3 out of 5

Directions are Confusing

Written By JackR, Pittsburgh, PA on Saturday, August 06, 2011
Crutchfield Customer Review (What's this?)
 
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.
1 out of 1 people found this helpful
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5 out of 5

works

Written By Cory, Eugene, OR on Monday, July 18, 2011
Crutchfield Customer Review (What's this?)
 
works as advertised, maintains all factory features in my 2007 Grand Prix
2 out of 2 people found this helpful
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2 out of 5

ok but not great.

Written By ivanE, Grand Rapids, MI on Saturday, July 02, 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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5 out of 5

Metra GMOS-01 Wiring Interface

Written By Anonymous, TAMPA FL. on Thursday, June 09, 2011
Crutchfield Customer Review (What's this?)
 
WORKS AS ADVERTISED
1 out of 1 people found this helpful
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5 out of 5

2007 TrailBlazer w/o OnStar

Written By stress, Pittsburgh, PA on Monday, June 06, 2011
Crutchfield Customer Review (What's this?)
 
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.
2 out of 2 people found this helpful
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5 out of 5

OnStar adapter

Written By Donnie, Vineland, NJ on Tuesday, April 19, 2011
Crutchfield Customer Review (What's this?)
 
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
1 out of 1 people found this helpful
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5 out of 5

Overpriced But Works Flawless

Written By Sundown, Upstate, NY on Monday, March 28, 2011
Crutchfield Customer Review (What's this?)
 
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.
3 out of 3 people found this helpful
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5 out of 5

Like a SNAP!

Written By Brian, Virginia on Sunday, March 27, 2011
Crutchfield Customer Review (What's this?)
 
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!
3 out of 3 people found this helpful
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4 out of 5

Better than the old ones

Written By txplshrk, Corpus Christi TX on Monday, March 14, 2011
Crutchfield Customer Review (What's this?)
 
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.
1 out of 1 people found this helpful
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5 out of 5

work well

Written By hope, chicago on Thursday, February 24, 2011
Crutchfield Customer Review (What's this?)
 
this unit work well. was very easy to install and i have no problem with it
1 out of 1 people found this helpful
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5 out of 5

It's like I never switched out my old OEM stereo

Written By EvansB, Arizona on Thursday, February 24, 2011
Crutchfield Customer Review (What's this?)
 
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.
2 out of 2 people found this helpful
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4 out of 5

Metra GMOS-01 Wiring Interface

Written By Robert P, Phoenix, AZ on Sunday, February 06, 2011
Crutchfield Customer Review (What's this?)
 
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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5 out of 5

Super Easy Install and Great Instructions

Written By Deb, Hillsborough, NC on Monday, January 31, 2011
Crutchfield Customer Review (What's this?)
 
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.
2 out of 2 people found this helpful
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1 out of 5

What a piece of junk!

Written By Dirk C, Ellendale, ND on Saturday, October 09, 2010
 
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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3 out of 5

Metra GMOS-01 Wiring Interface

Written By Derrick T, Fairview Heights, Il on Thursday, September 30, 2010
Crutchfield Customer Review (What's this?)
 
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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5 out of 5

Great product

Written By Bob B, Seaford VA on Sunday, August 22, 2010
Crutchfield Customer Review (What's this?)
 
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.
1 out of 1 people found this helpful
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5 out of 5

Metra GMOS-01 Wiring Interface

Written By Anonymous, Delaware on Wednesday, August 18, 2010
Crutchfield Customer Review (What's this?)
 
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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5 out of 5

as advertised

Written By Benny, Kansas City, MO on Tuesday, June 15, 2010
Crutchfield Customer Review (What's this?)
 
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.
3 out of 3 people found this helpful
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4 out of 5

Skeptical

Written By Angel, Chesapeake, VA on Monday, May 03, 2010
Crutchfield Customer Review (What's this?)
 
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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4 out of 5

Wroks well, questionable quality

Written By Anonymous, Rochester, NY on Sunday, April 11, 2010
Crutchfield Customer Review (What's this?)
 
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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4 out of 5

Works Nicely

Written By twenty4pack, Niceville, Florida on Sunday, September 20, 2009
Crutchfield Customer Review (What's this?)
 
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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4 out of 5

IT WORKS!!!

Written By Lee, Wichita, KS on Thursday, September 03, 2009
Crutchfield Customer Review (What's this?)
 
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.
2 out of 2 people found this helpful
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3 out of 5

"Retains On Star" not accurate

Written By Anonymous, Xenia, OH on Saturday, August 29, 2009
Crutchfield Customer Review (What's this?)
 
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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2 out of 5

Low quality

Written By Douglas, Seattle, WA on Monday, June 29, 2009
Crutchfield Customer Review (What's this?)
 
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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4 out of 5

works good- a lot of wires though

Written By jasonv, phoenix, az on Thursday, April 23, 2009
Crutchfield Customer Review (What's this?)
 
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.
1 out of 1 people found this helpful
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2 out of 5

product quality

Written By Bryan, Jacksonville FL on Monday, March 09, 2009
Crutchfield Customer Review (What's this?)
 
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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4 out of 5

Metra GMOS-01 Wiring Interface

Written By Ian, Lake Charles, Louisiana on Sunday, February 15, 2009
Crutchfield Customer Review (What's this?)
 
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.
1 out of 1 people found this helpful
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