Metra GMOS-01 Wiring Interface

This unit plus the custom wiring option made installing the units totally painless. I just had to quit overthinking the process.

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Metra GMOS-01 Wiring Interface

it worked the first time but had to read directions 3 times, the 'text only' wiring instructions can be confusing, a color coded diagram would be nicer.

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Metra GMOS-01 Wiring Interface

Made my install a breeze.

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Is it worth having- yes

This device restores several features otherwise lost with after market installations. I have several GM vehicles using a GMOS-1. 1 failed after 4 years and just after an arcing event during a battery replacement. So it's more sensitive t than I expected. I recommend having back up power connected during battery replacement to avoid damage. When the radio did not power up and the chime for key in/door open quit this was my first suspect.

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A must.

Makes for a flawless, easy install.

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Metra GMOS-01 Wiring Interface

Worked great, simple plug & play

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Metra GMOS-01 Wiring Interface

The pins in the connector are somewhat cheesy and the pins are a little loose. When I hooked to my factory radio harness one of the pins was just loose enough to bend out of the way. Every time I went to stuff the wire harness into the dash that pin would disconnect itself just enough for the head unit to quit working. It was a head scratcher for about 15 minutes. Once I figured it out it works perfectly.

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Metra GMOS-01 Wiring Interface

Works great.. good instructions..easy to install

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Metra GMOS-01 Wiring Interface

Easy to install with the color codes and works as it should retaining factory chines and onstar

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Metra GMOS-01 Wiring Interface

Works perfectly. Simple instructions. Great product.

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Metra GMOS-01 Wiring Interface

The representative I talk to, he made everything very smooth sailing. I told him what type of vehicle I had and what I was trying to do and he directed me right where I needed to be and, I got what I needed the very next day

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Metra GMOS-01 Wiring Interface

Worth every penny. Literally plug and play and made installation very fast

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Metra GMOS-01 Wiring Interface

Made wiring new stereo very easy.

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Affordable and worth it!

Easy to use and works like it should!

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Metra GMOS-01 Wiring Interface

wiring harness did not work. It was easy enough to match up where everything plugged in and the unit would not power on. I ended up frustrated and taking it to a professional install business and they flat out told me it was not wired properly. They Chopped all the connections and wired it properly for me and I took it right out to my vehicle and plugged everything in and it came right on. So, not only did I pay Crutchfield to wire the harness correctly which they didnt, I had to pay $80 some where else to have them do it.

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Crutchfield response on 1/6/2021

Once we saw this review, our Tech Support specialist, AJ, reached out to this customer to help him further. Whenever you encounter a problem with anything you purchase from Crutchfield, please contact our Tech Support team right away. Lifetime tech support comes with every Crutchfield purchase.

Metra GMOS-01 Wiring Interface

Great to have the radio back

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Metra GMOS-01 Wiring Interface

2002 Chevy Trailbalzer... worked as designed for a system without Boss. I have an Onstar and it works fine.

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Does what it is supposed to do.

Worked great in my Chevy cavalier, used the ready harness service and was well worth the money.

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Metra GMOS-01 Wiring Interface

Easy to use and fit my vehicle perfectly.

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Metra GMOS-01 Wiring Interface

Very confusing to install. 80% of the harness wiring is not applicable to my application and had to call tech support twice to figure it out. Chimes still don't quite work all the time.

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Metra GMOS-01 Wiring Interface

First harness was defective but when we called the representative was very helpful and sent a replacement right away and it worked.

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Metra GMOS-01 Wiring Interface

Easy to use, a must have when installing a new unit.

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Metra GMOS-01 Wiring Interface

Works great

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Metra GMOS-01 Wiring Interface

Works well

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Metra GMOS-01 Wiring Interface

I bought this product thinking it was what I needed for my 2005 Monte Carlo ss because that what is says and as I'm installing it the connectors don't fit together like they aren't meant for each other after it says this product will fit my car such a waste of time they need to just sell you the product that will fit your car like they say it does

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Crutchfield response on 4/13/2020

We're sorry you're having issues with your interface. If you purchased this product from Crutchfield, feel free to contact our Tech Support team. They can help you solve the problem or set up a return within 60 days of purchase. Lifetime tech support comes with every Crutchfield purchase.

Metra GMOS-01 Wiring Interface

Works just like I had hoped for

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Metra GMOS-01 Wiring Interface

9

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Metra GMOS-01 Wiring Interface

Skimped on wire length.

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Metra GMOS-01 Wiring Interface

Works great! Ideal item! Good price!

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Metra GMOS-01 Wiring Interface

Works great.

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Metra GMOS-01 Wiring Interface

Easy to install and worked perfectly.

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We'll see

Haven't had time to even start the install I expect this product to work flawlessly

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Easy installation

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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Functional but pricey

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.

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Metra GMOS-01 Wiring Interface

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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Worked OK until it didn't

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.

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not really sure it was needed but installed anyway

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.

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Metra GMOS-01 Wiring Interface

loved it easy to hook up

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Metra GMOS-01 Wiring Interface

Helped a lot in re wiring.

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Metra GMOS-01 Wiring Interface

Wiring interface works as advertised. The instruction manual could be a bit more detailed.

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Metra GMOS-01 Wiring Interface

Great product make my installation so easy

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Easy instal, everything works...

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.

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gmos-01

Looks like a nightmare but once you get into the instructions its not to bad.

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Expensive but necessary item if you want to retain sounds / onstar

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.

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Metra GMOS-01 Wiring Interface

Just stopped working not giving power to my head unit or speakers

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Crutchfield response on 8/21/2017

After receiving this customer's feedback, we looked up his order and found that his interface is still under warranty. While his order is beyond Crutchfield's 60-day return policy, he can contact Metra at 800-221-0932 for further information about the 1-year warranty on this interface.

Metra GMOS-01 Wiring Interface

It works great. The instructions aren't too clear but you'll eventually get it.

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Metra GMOS-01 Wiring Interface

Nice and perfect

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Metra GMOS-01 Wiring Interface

Had problem called talked with Tech they came up with answer had product shipped and installed fixed problem works great

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Awesome product

This product made my JVC receiver super easy to install!

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Working as expected in my 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

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Metra GMOS-01 Wiring Interface

Very easy set up if you follow directions.

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Metra GMOS-01 Wiring Interface

Works but the instructions suck, took an hour or so to complete the wiring

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Crutchfield response on 3/21/2017

We're sorry you had problems during your installation. Whenever you encounter a problem with anything you purchase from Crutchfield, please contact our tech support team right away. Lifetime tech support comes with every Crutchfield purchase.

would not reccomend

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

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Crutchfield response on 2/22/2017

Doug, we're sorry you're having issues with your interface. If the problem continues, please just reach back out to our tech support team. They can either help get everything working the way it should, or possibly return it for an exchange or refund. Purchases from Crutchfield can be returned or exchanged within 60 days of the purchase.

Metra GMOS-01 Wiring Interface

Works great

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Lacking Info !

Confusing and Lacking some info that Crutchfield costumer service had that is not in the instructions that the consumer gets.

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Metra GMOS-01 Wiring Interface

This wire harness does exactly what it's supposed to connect in my aftermarket DVD player no problem retain OnStar

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Good harness, buggy instructions

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.

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Metra GMOS-01 Wiring Interface

Worked. Flakey connections so not sure how long it will last.

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Metra GMOS-01 Wiring Interface

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.

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Metra GMOS-01 Wiring Interface

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.

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Metra GMOS-01 Wiring Interface

Great product and very helpful service getting the right part.

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Metra GMOS-01 Wiring Interface

made my install easy

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Install gear

Easy to install with kenwood head unit

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Install kit

works well, easy to install, had all connections necessary for rear view camera operation.

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Clean and easy install, Retained all OEM functions

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!

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Needed accessory

Has all the features to keep your vehicle in OEM operating condition.

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Gmos01 for 2012 canyon

Works as described.

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Great Product, Confusing Installation

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.

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Metra GMOS-01 Wiring interface

It's doing what it's supposed to do. No complaints. Wired up fairly easy.

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Perfect

Came with new head unit and worked just as advertised

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Instructions are outdated but works fine

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.

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Good harness though the instructions need a bit of work.

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.

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Axxess GMOS-01 GM 2000-UP

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!

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Crutchfield response on 2/15/2016

Whenever you encounter a problem with anything you purchase from Crutchfield, especially a situation like this, please contact our Tech Support team. Purchases from Crutchfield can be returned or exchanged within 60 days of the purchase.

Man that's a lot of wires

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.

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Worked well, but those two red wires though

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..

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Metra GMOS-01 Wiring Interface

Worked as advertised. Not to hard to wire up. I would rate the task as intermediate .

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Perfect!!!!!

This wiring harness worked perfectly for 08 Hummer!!!!

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Directions need to be more clear

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.

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Essential piece of euipment

Installed with a new Sony Unit and was able to maintain all factory functionality such as On Star, door chimes, etc.

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Worked perfectly for 2006 chevy 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.

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Easy install

Made the the installation easy

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Works great

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.

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GMOS-01

Good product, poor directions!

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Metra GMOS-01 Wiring Interface

Great product, wiring diagram was clearly explained & connectors fit perfectly

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Works well

Worked perfectly

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good quality

works great, plug and play item unless your using a steering wheel adaptor also but still a must have for proper installment.

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GMOS-01

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.

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Metra GMOS-01

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.

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like it

Plugs right into my 04 gmc envoy

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Quality harness for 2008 Chevy 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.

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Perfect

Easy to wire up, keeps all your lovely chimes and such (if you want).

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Worked really well

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

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Does not Work

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.

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Harness for Chevy 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.

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Works Great

Works great. It's a little intimidating at first sight but follow the directions and go one wire at a time.

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Great

Great product, quick and easy to install. Had it wired and ready to go within 10 minutes.

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Metra GMOS-01 Wiring Interface

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.

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Great product

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

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