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Metra VT-GMOS-04 Factory Integration Adapter

Install a new car stereo and retain OnStar®, the audible safety warnings and chimes, and the Bose® audio system in select GM vehicles

Save with a compatible car stereo with a compatible car stereo
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Our take on the Metra VT-GMOS-04 Factory Integration Adapter

by Charlie Pastorfield

Metra's VT-GMOS-04 GM radio replacement adapter 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 adapter to connect an aftermarket stereo.

Once you connect your in-dash receiver to the adapter, you'll get the great sound you want, and keep these important features intact. The Bose amplified speakers and the OnStar system will operate with your new radio, as well as the door chime and audible safety warnings. This adapter gives you convenient plug-in connections for the Axxess steering wheel control adapter (not included) that works with most aftermarket stereos – that means less wiring work for you.

Also, once you turn off the ignition in these GM vehicles, the factory radio continues to play until you open the door. This interface maintains that function with your new aftermarket radio. This interface is compatible with select 2000-and up GMC, Chevrolet, Oldsmobile, Cadillac, Pontiac, Isuzu, and Hummer vehicles. Warranty: 1 year.

Important Note: 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 your GM vehicle's warning chimes are integrated with the factory radio. If so, certain warning chimes in your vehicle may be disabled by installation of an aftermarket receiver. You must use the recommended Crutchfield integration adapter to retain the warning chimes. Failure to do so may result in serious injury or death.

See more info on this item

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-04 interface module
  • 16-pin harness with stripped leads
  • 18-pin harness to 12-/24-pin GM harness with stripped leads
  • 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-04 interface is designed to let you replace the OEM radio with an aftermarket unit in amplified GM vehicles and retain full functionality of the OnStar system as well as all safety and warning chimes. The GMOS-04 will also retain the retained accessory power convenience features. This interface has the capability of adjusting chime and OnStar volumes as well. In addition to these features, the GMOS-04 has the required outputs for the installation of a navigation radio (including VSS, parking brake, and reverse outputs).

Vehicle Compatibility Chart: The GMOS-04 works in the following 2000-up GM vehicles.

Make Model Year
Buick Allure 2005-2009
Century 2004-2005
Lacrosse 2005-2009
Rainier 2004-2007
Rendezvous 2002-2007
Terraza 2005-2008
Cadillac Escalade 2003-2006
Chevrolet Avalanche 2003-2006
Cavalier 2000-2005
Corvette 2005-2010
Express 2003-2007
Impala 2000-2005
Malibu 2001-2004
Monte Carlo 2000-2005
Silverado 2003-2007
SSR 2003-2006
Suburban 2003-2006
Tahoe 2003-2006
Trailblazer 2002-2009
Uplander 2005-2008
Venture 2000-2005
GMC Envoy 2002-2009
Savanna 2003-2007
Sierra (Classic) 2003-2007
Yukon/Denali 2003-2006
Hummer H2 2003-2007
H3 2006-2009
Isuzu Ascender 2003-2008
I-Series Pickups 2006-2008
Oldsmobile Alero 2001-2004
Bravada 2002-2004
Intrigue 2002
Silhouette 2000-2004
Pontiac Aztec 2001-2005
Grand Am 2001-2005
Grand Prix 2004-2008
Montana 2000-2005
Sunfire 2000-2005
SAAB 9-7x 2005-2009
Saturn Relay 2005-2007
Note: Please consult Crutchfield's Outfit My Car for your specific vehicle and application.

OEM Steering Wheel Control Compatible (optional): The GMOS-04 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).

Note: The GM vehicle must have factory steering wheel controls to retain access to the factory customization menu, once the factory radio is replaced with an aftermarket head unit.

OnStar and Chime Volume Adjustment: The volume is adjustable for both the OnStar output and the warning chime.

 
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Metra VT-GMOS-04 Factory Integration Adapter Reviews

Average Customer Review:

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4 out of 5

GMOS-04 adapter cable

Written By zbee062, Anderson, SC on Tuesday, July 22, 2014
Crutchfield Customer Review (What's this?)
 
I recently purchased a DNX890HD to replace an older unit in a 2008 non-Bose Corvette. The instructions were reasonably clear and I successfully spliced the adapter and the 890 unit together and everything worked first time. This included rear and forward facing cameras, OnStar (no subscription but music correctly muted automatically while listening to the recorded message). The nav screen automatically switched to the rear facing view when reverse was selected. The HD radio worked very well, as did an iPod, an MP3 player (via the Kenwood KCA-IP202 cable) and an iPhone 4S via the 890 built in Bluetooth system. The speakers could be controlled as per input to the 890 unit. Chimes worked correctly when the door was opened in accessory mode. Did not test other possible alerts. Had to read instructions closely several times to catch that the GMOS-04 cable red wire connects to the red wireS (i.e. both?) from the 890 unit. Including the word "both" red wires would have saved some time trying to understand which red wire to use. Per comments below one red wire should be connected to the steering wheel controls which was not used on this installation.
Pros:
Instructions were good and easy to follow. I found it useful to read other reviews in various forums before splicing the cable to gain a better understanding of any potential problems that may arise (there were none for me).
Cons:
None except it looks a mess when everything is connected, but that is hidden from view when installed. Only tested for one day in the car as the Nav system failed ("no maps available") , nothing to do with the cable but it prevented longer term testing as the 890 unit was returned.
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2 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Anonymous, Lexington, Kentucky on Monday, July 14, 2014
Crutchfield Customer Review (What's this?)
 
Very complicated with poor instructions
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5 out of 5

Nice unit

Written By Anonymous, Lincoln Ne on Tuesday, July 01, 2014
Crutchfield Customer Review (What's this?)
 
Straight forward wiring
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5 out of 5

Does what it's supposed to do...

Written By S, Kansas City on Tuesday, June 03, 2014
Crutchfield Customer Review (What's this?)
 
Works perfectly in my 2002 GMC Envoy.
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3 out of 5

Works with a little intervention.

Written By Allen E., Oswego, IL on Monday, April 28, 2014
Crutchfield Customer Review (What's this?)
 
Not a difficult install if you can handle a soldering iron and read. Unfortunately the directions were not 100% accurate. Probably i the nature of a "universal" adaptor. Had to experiment a little with the wires that were supposedly "not used". Head unit didn't receive power at first after follwoing teheir instructions. Turned out that the three wires that were to be "cut" and not used, 2 had to be reconnected for the head unit to function. So far works fine . . . with a little ingenuity on my part.
Pros:
Works.
Cons:
Not perfect instructions
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5 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Anonymous, sonora, Tx on Monday, April 21, 2014
Crutchfield Customer Review (What's this?)
 
It works good, it does what it supposed to. The only concern I had was during installation there were two bat. Red wires, now were both of those wires supposed to be connected together or was just one supposed to be connected. I connected both of them together to the12v source wire. Should I leave both of them connected or go back in there and just leave one connected?
Crutchfield response on Wednesday, April 23, 2014
One of those red wires is meant for powering the optional ASWC-1 adapter for the steering wheel controls. Our tech support team followed up with the customer to let him know.
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5 out of 5

Easy install... Easy life

Written By MisterBond1989, Adelanto on Thursday, April 10, 2014
Crutchfield Customer Review (What's this?)
 
This adaptor is awesome! Makes things easy to install another radio. No cutting or splicing of wires. Only one issue that I have found while using this product is that the factory Monsoon amp in the 1999-2005 Pontiac Grand Am does not get bypassed. If you have a Monsoon equipped Grand Am; the factory external amp needs to be used in order for the factory speakers to work. This makes sound quality very poor and low. If this is the case for you, I suggest installing an external amp and get rid of the Monsoon amp. Beside that issue; great product!
Pros:
Makes install of radio easy, clean, and worry free. No cutting of the factory wires needed.
Cons:
Does not bypass Monsoon amp in the 1999-2005 Pontiac Grand Am.
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3 out of 5

Does it's job

Written By JYaz, Hanover, PA on Thursday, April 10, 2014
Crutchfield Customer Review (What's this?)
 
It does what it should
Pros:
It works
Cons:
All of the wires are confusing. Instructions aren't the best.
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5 out of 5

05 gmc truck upgrade

Written By Doug H, Charleston S.C. on Tuesday, March 25, 2014
Crutchfield Customer Review (What's this?)
 
Upgrading the truck with a sony cd player,truck has the bose radio speaker system,and the connections were spot on,cant imagine how much better the truck sounds now,that i have a real radio in it
Pros:
easy to install,ajustable door chime module
Cons:
blue/white wire for amp signal looks alot like the blue/pink wire,that should be pinker,or not even blue at all
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5 out of 5

Great adapter

Written By David, Fremont, NC on Sunday, March 09, 2014
Crutchfield Customer Review (What's this?)
 
Easy install and worked great with my 2005 Avalanche with Onstar,Bose Sound System and Navigation. You may want to shorten the wires on the 16 pin connector unless you have plenty of room for the wires and your new stero.
Pros:
installs quickly and instructions are very clear and easy to follow. Crutchfield support was extremely helpful but you shouldn't need them with this adapter. I had issues with another adapter not working with my vehicle and required their help.
Cons:
None
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5 out of 5

Simple

Written By Dahveed18, Flint, MI on Sunday, March 09, 2014
Crutchfield Customer Review (What's this?)
 
Simple to use!
Pros:
Adjustable gain, adjustable OnStar volume, adjustable chime level
Cons:
None
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5 out of 5

Metra VT-GMOS-04

Written By Sean P, Southern California on Saturday, February 22, 2014
Crutchfield Customer Review (What's this?)
 
Plug and Play, worked well
Pros:
easy install
Cons:
needs second cable for steering wheel
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5 out of 5

Worked well

Written By CCVirginia, Fairfax, VA on Tuesday, February 18, 2014
Crutchfield Customer Review (What's this?)
 
Worked well to integrate with a 2005 Suburban. Retained all the factory functions.
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3 out of 5

Works

Written By aditaa, Austin, TX on Saturday, February 08, 2014
Crutchfield Customer Review (What's this?)
 
Works as expected
Pros:
factory amp works onstar and door chimes still work via radio speakers
Cons:
very messy wiring configuration still need extra part for steering wheel controls
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5 out of 5

Worked perfect

Written By Lox4rox, Texas on Sunday, February 02, 2014
Crutchfield Customer Review (What's this?)
 
Worked perfect with my 2004 Denali. Plug and play once the harnesses are wired up...instructions were excellent. All onstage and chimes at just as with factory head unit.
Pros:
Easy if install. Everything works per factory norms.
Cons:
None
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5 out of 5

Does what it says it'll do

Written By JT, Bosque Farms, NM on Saturday, January 25, 2014
Crutchfield Customer Review (What's this?)
 
Easy to install, works as advertised. Like the fact that I can turn the door chime way down.
Pros:
Ease of installation, good instructions
Cons:
None so far
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4 out of 5

Works well

Written By Jeff M, San Antonio, TX on Friday, January 03, 2014
Crutchfield Customer Review (What's this?)
 
This unit was necessary to retain the door chimes and the Bose system in my truck. My truck isn't equipped with OnStar, but this unit will accommodate those vehicles that do. I would prefer not to have the extra wires floating around the dash, but for the price, I'll live with that. I had a couple of questions on the install, but as always, Crutchfield customer service was able to answer them quickly and the install was a breeze.
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3 out of 5

Unit works, instructions horrible

Written By Steve KY, Ashland KY on Friday, January 03, 2014
Crutchfield Customer Review (What's this?)
 
First of all, the thing does what is supposed to. The instructions are miserable. Hook up red wire,it has two. several others are the same way. I called Crutchfield and they told me how to make it work. Without that it would ne impossible.
Pros:
Works
Cons:
Have to call to get help, not so good when trying to install Christmas present on Christmas day.
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4 out of 5

Works well

Written By Matt, Milwaukee, WI on Friday, January 03, 2014
Crutchfield Customer Review (What's this?)
 
Works as its intended, Instructions could be a bit clearer though.
Pros:
Adjustable chime volume
Cons:
n/a
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5 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Anonymous, Lansing, Mi on Sunday, December 22, 2013
Crutchfield Customer Review (What's this?)
 
Very easy and clear instructions, everything worked and made sense. Potentiometer was a great but unadvertised bonus.
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5 out of 5

Perfect for GM with Bose

Written By EA, El Segundo CA on Thursday, December 19, 2013
Crutchfield Customer Review (What's this?)
 
Works perfectly. Easy to install
Pros:
Works perfectly. Easy to install
Cons:
None
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2 out of 5

Hope the new version is better than the old

Written By Ross, Chesapeake, VA on Friday, December 13, 2013
Crutchfield Customer Review (What's this?)
 
I had the exact same adapter previously installed in my 2003 silverado SS. After about 4 years my battery died out of no where - after months of trying to diagnose the issue and finally taking it to a stereo shop they found this adapter to be the cause of a 754ma draw. I recently purchased this one and it solved the issue. After reading online this it apparently a common issue but since no other adapter is out there you're pretty much out of luck if you want to keep BOSE and chimes with an aftermarket HU. That aside - the instructions are great - install is painless assuming you know how to strip and crimp wires. The overall bulk added to the harness is extremely annoying but again, what other choice do you have? Fingers Crossed this unit works.
Pros:
Easy Installation, Good instructions
Cons:
Overpriced, does not last, bulky mess added to your oem harness
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5 out of 5

Simple and easy to install

Written By Drock77, Claremore, Ok on Tuesday, December 03, 2013
Crutchfield Customer Review (What's this?)
 
Simple to wire up and easy to install
Pros:
Simple to wire up and easy to install, it also has a volume knob to increase or decrease the vehicle chime volume.
Cons:
N/A
1 out of 1 people found this helpful
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4 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Anonymous, Aurora IL. on Saturday, November 30, 2013
Crutchfield Customer Review (What's this?)
 
Works well, only reason I gave a 4 is because we had to call for wiring issue, it is a bit universal which I understand. the good news is the staff is great, always answer the phone and talk you through it.
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5 out of 5

great quality product.

Written By richie o., bronx ny on Saturday, November 23, 2013
Crutchfield Customer Review (What's this?)
 
Great Product. harness works like factory with newer modern cars. Love the web site.very helpfull. cant wait to do more business
Pros:
Crutchfield knows there stuff
Cons:
None
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5 out of 5

Pure awesomeness

Written By jasonsfn, Sacramento, CA on Sunday, November 17, 2013
Crutchfield Customer Review (What's this?)
 
Being able to install an top of the line Alpine and also have it integrate with all of my factory equipment on my 2004 Tahoe was amazing, this wiring kit is a must! would use it again in any applicable install situation.
Pros:
Allows you to keep all of the things you loved about the factory receiver and on star while upgrading your sound. It works and sounds amazing. even has open slot for the steering wheel harness to plug right in saving time and the use of extra wiring.
Cons:
Cant really find any.
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5 out of 5

A Must Have

Written By Anonymous, Sussex, WI on Thursday, November 07, 2013
Crutchfield Customer Review (What's this?)
 
This is a must have ... It was very easy to hook up and works great. I would strongly recommend this to anyone hooking up an aftermarket radio.
Pros:
Easy to hook up and as always the customer support is the BEST
Cons:
Bigger print and a easier to read diagram
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5 out of 5

It just works.

Written By Dirk A, Jonesboro, AR on Wednesday, November 06, 2013
Crutchfield Customer Review (What's this?)
 
Ok....first off I have been hesitant about upgrading the head unit it my last few GM vehicles due to interface issues. With a 2008 Grand Prix that is not going anywhere, and no way to use any external devices decided it was time to upgrade. Our car has the factory amp with the "Monsoon" system, and I was pretty sure that I would have to bypass it. After reading the capabilities of this integration adapter......it seemed I could retain the amp, which would simplify installation. It did this perfectly, along with the retention of the factory chimes. The device itself is just a small black box, with 2 wiring harness. It "inlines" between the head unit and the factory plugs. I did not have to adjust the volume level for either the OnStar, the chimes, or the speakers. This procedure if needed is described in much better detail on the manufactures website. THIS IS IMPORTANT!! If like me, you tested everything before buttoning it back up, the chimes for the "key in ignition", lights on, door open, etc. DID NOT WORK until I plugged the Driver Information Center (DIC) back up. At first I thought it was a problem with my wiring or the Metra unit, but since I couldn't leave the car apart....I went ahead and put it all back together.....everything worked as needed after the DIC was plugged back up. If Metra could have kept the steering wheel controls and kept the date display on the DIC, the unit would have been perfect.
Pros:
Simple instal, works as needed, good build quality.
Cons:
High MSRP, some features could be added, poor included instruction.
1 out of 1 people found this helpful
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5 out of 5

As if it were factory

Written By Ray S, Sandwich Il on Sunday, November 03, 2013
Crutchfield Customer Review (What's this?)
 
I fairly strait forward wiring job works great.
Pros:
A quick download of a PDF from the web site and it was a breeze
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1 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Jack, Castro Valley, CA on Thursday, October 31, 2013
Crutchfield Customer Review (What's this?)
 
After installing this unit in my 2005 Grand Am GT soldering every connection and using heat shrink. I had nothing but problems. I double and triple checked the wiring all was correct. I had low volume even after using the adjustment knob. (it did nothing) The sound only worked with the door open and chimes ringing. close the door and no sound but the radio still had power. I called Cructhfield tech. The tech person was very nice and tried to help but even after I tried all the things he suggested nothing changed. So I removed the unit and installed a GMOS-01 similar to the 04 but without the BOSE feature. I don't have BOSE in this car so I really didn't need the 04 version anyway. So now all is well.
Pros:
None for me.
Cons:
Did not work. I had to cut all those beautiful connections I made.
Crutchfield response on Sunday, November 03, 2013
We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.
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4 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Mike F, Fort Worth, TX on Monday, October 28, 2013
Crutchfield Customer Review (What's this?)
 
Kept my door chimes and OnStar integrated on my 2003 Buick Rendezvous. FYI, READ ALL INSTRUCTIONS!! I didn't read where you are supposed to set the gain on the harness. I thought my newly purchased JVC bluetooth unit was a terrible buy for the 1st few days. Then, I went back and read all the instructions on the Metra integration adapter. Opened the dash back up and set the gain. Made ALL the difference. Speakers are rocking once again!
Pros:
Keep integration
Cons:
Some of the wiring instructions aren't exactly clear, but managed to get it figured out without too much hassle.
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3 out of 5

good adapter

Written By chefjoey, woodridge, il on Saturday, October 26, 2013
Crutchfield Customer Review (What's this?)
 
needed this to install aftermarket radio in my 2005 trailblazer with onstar, satellite radio, and factory chimes
Pros:
works ok
Cons:
wiring instructions do not cover all the wires that are on the harness, hard to adjust the volume for the onstar, need to pull the radio !
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5 out of 5

Great product keeps the bells and whistles in your automobile.

Written By Pasquale M., Massachusetts on Thursday, October 24, 2013
Crutchfield Customer Review (What's this?)
 
If you want to keep your car/truck factory with the bells and whistles this item is a must. Easy install.
Pros:
Easy install just follow the directions. Others have said that this install created a battery drain. Only way that will happen is if you cross your power line (red) with the memory line (orange). A perfect solution to keeping on star and door chimes on your vehicle. Super easy to install with you after market radio.
Cons:
None
4 out of 4 people found this helpful
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5 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By DarrellD, San Antonio, TX on Friday, October 11, 2013
Crutchfield Customer Review (What's this?)
 
This harness worked flawlessly
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4 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By d500, Independence, KY on Wednesday, October 02, 2013
Crutchfield Customer Review (What's this?)
 
Its a nightmare to get hooked up but it works very well when you finally figure out the directions
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4 out of 5

Worked right out of the box.

Written By Trevor, Albert Lea, MN on Monday, September 16, 2013
Crutchfield Customer Review (What's this?)
 
There are extra instructions on the Metra website that does not show up with the unit, but everything installed without a hitch. You need to set the door chime first with the adjustment screw and then use the same screw to adjust the volume of the head unit, this is the part that is on the website.
Pros:
Worked flawless
Cons:
Price, directions not complete.
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5 out of 5

Metra VT-GMOS-04

Written By Steve D, California on Thursday, September 05, 2013
Crutchfield Customer Review (What's this?)
 
This adaptor works perfectly! I used this to install a Kenwood DDx470 in my 2003 GMC 2500HD. The directions were well written and easy to follow. Everything works as it should. I also used the steering wheel controls adaptor. The pre-wired connectors make it simple to install.
Pros:
Easy to follow instructions.
Cons:
None. Everything worked perfectly.
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4 out of 5

Metra VT-GMOS-04 for GM Vehicles

Written By JimM, Greenville, NC on Tuesday, September 03, 2013
Crutchfield Customer Review (What's this?)
 
Used this adapter to connect a Kenwood HD with Nav system into a 2006 Corvette. The connections are very well explained into the instruction and wire color code matched very well with the wire of the Metro adapter. This made it very easy for myself to install. The only issue was the instruction for corvettes(only) indicated the adapter needed to be attached to a relay. The instruction should note that the relay is not on the car and would need to be purchased and installed using a fuse tap. In all it went very well as it worked without having to make any adjustments or corrections.
Pros:
Color codes on wire matched codes on the Kenwood radio
Cons:
Bulky wire pack to place behind the radio.
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5 out of 5

Great product

Written By Anonymous, Lutz florida on Thursday, August 29, 2013
Crutchfield Customer Review (What's this?)
 
Great part thank Crutchfield
Pros:
Easy installation
Cons:
Non
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4 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Anonymous, Franklin, Tn on Thursday, August 22, 2013
Crutchfield Customer Review (What's this?)
 
Works great the only thing is in the instructions it says the knob it for chime volume. it's not it controls the amp volume
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5 out of 5

Integration Kit

Written By Awt2b!, Seattle, WA on Monday, August 12, 2013
Crutchfield Customer Review (What's this?)
 
I used this harness for our 08 TrailBlazer SS to replace the Bose with a Kenwood. Everything I needed was included. There is no reason not to buy it from Crutchfield...It was a lot more money at any other place I looked!!
Cons:
For the Bose/OnStar there is a BabyBlue wire that you need to hook up for the proper sound to work. Then on the 'inline' box that comes with the kit...It has a small blue adjustment knob that we did not see until after we hooked up the blue wire to get sound. Then we turned the blue adjuster clockwise and UP went the volume...make sure your Deck is on about volume 2 when turning up the blue dial.
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5 out of 5

Worked great but still took work

Written By Soldier meister, Pasadena, CA on Friday, July 26, 2013
Crutchfield Customer Review (What's this?)
 
Worked great! Wires colors matched and everything. I soldiered the connections so it took a little longer. Note, when connecting the steering control adapter you the 12pin connected to this not the 12pin that comes with the steering wheel controls adapter.
Pros:
Works great
Cons:
Lots of wires - would be awesome if it used quick connects.
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3 out of 5

Current replacement interface for GM trucks

Written By Angelo, Virginia Beach, VA on Tuesday, July 23, 2013
 
My old interface was on its way out, I had an alpine deck in my 2004 Sierra 2500 HD for almost 6 years from Crutchfield, so I called them and they sent this interface for half price to replace it. Shipping and customer service as always is A++ with these guys, but the interface itself is as expected from anything made in China....less than sub par. The wiring was fine, soldered everything into place, the box (interface) itself was a dud, so after running the gambit of troubleshooting, I called up Crutchfield and they sent me a replacement for free with a pre-paid return via UPS. The second one worked fine, I really appreciate all the years of great support guys.
Pros:
Easy install with a bit of common sense and the right tools, supports a wide variety of GM vehicles.
Cons:
Made in China and is junk....but since it's the only reasonable option to run aftermarket radios in GM trucks.....
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1 out of 5

Do not buy this product!

Written By Joe S., Lowell, MI on Saturday, July 13, 2013
 
Do not buy this adapter unless you plan to leave your car connected to a battery charger every night. Within two days of installing this, my battery was completely dead. I fully charged the battery, and it died again within two days. I had the battery tested, and it was fine. This is the second GMOS unit I've installed that has caused this problem, and yes...it was installed correctly. Not that the instructions are particularly well written, but the wire connections are not that complicated. I ended up removing the GMOS unit and just keeping the wiring harness from it to connect to the vehicle's wiring harness...and surprise...the problem is gone. Ultimately I lost my OnStar (which I don't use) and my door chimes (who cares). It sucks that I had to pay this much for a $5 wiring harness, but that's what I get for not reading all of the reviews. It turns out many people have had the same issue with this unit. Crutchfield should realize this unit is junk and stop telling people its "required"...it most certainly is not, and it will cause you nothing but headaches. If I could have given this thing less than 1 star, I would have.
Pros:
Easy to connect, maintains door chimes and OnStar. It also allows you to make good use of a battery charger and makes you late for work until you pull it out. The only useful part of it is the harness that connects to your car's factory harness.
Cons:
Seriously diminishes the sound to your speakers and drains your battery when the car is off.
3 out of 7 people found this helpful
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5 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Anonymous, Indianapolis, IN on Friday, July 12, 2013
Crutchfield Customer Review (What's this?)
 
Product worked as desired. Resolved issue with another radio that I bought, and no sound would play after it was installed. Returned that radio, bought new radio from here, with this adapter and all is working we. The real issue was the wiring, and I called support twice. Waited just a few minutes each time and they were able to resolve my problem in just a few minutes..
Pros:
Crutchfield support was awesome
Cons:
None
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5 out of 5

Easy install.

Written By Michael, Independence,MO on Wednesday, July 10, 2013
Crutchfield Customer Review (What's this?)
 
Easy install, unless you have Bose. Had to retire Bose amp in center console to bypass it. Not bad. You will have to bypass Metra module with your speaker leads if getting rid of Bose amp. Then run wires for right front speaker coming out of module to input on Bose amp right front. The from output right front on Bose amp to parrot speaker you have to install under cup holder. Works like a charm this way.
Pros:
Easy to install. Easy to adjust.
Cons:
Need additional speaker to hear warning chimes and OnStar and must bypass factory amp to get the most out of your new stereo.
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5 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Anonymous, Gilberts, IL on Monday, July 08, 2013
Crutchfield Customer Review (What's this?)
 
Perfect, couldn't work better
Pros:
Great instructions and labeling
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3 out of 5

GMOS-04

Written By T, Litchfield, IL on Monday, June 24, 2013
Crutchfield Customer Review (What's this?)
 
What ever you do, try everything before putting your dash back together. Had to bypass hooking my parking brake wire to the lt. green wire of the gmos-04. If these are supposed to be vehicle specific they need to work on them some more. Thanks to the crutchfield techs they are the best. Only had one that wasn't much help but call the guy that helped me the most. Thanks Casey
Pros:
easy to hook up
Cons:
extra wires again and a pain to try and put them behind the radio in the dash neatly.
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4 out of 5

GMOS-4

Written By Nick, Houston, Tx on Saturday, June 22, 2013
Crutchfield Customer Review (What's this?)
 
A-
Pros:
Retained all factor and Onstar chimes as promised.
Cons:
Loss of stock amplifier but system is upgradable due to aftermarket radio.
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4 out of 5

Works OK

Written By LBRU, Falls Church, VA on Monday, May 27, 2013
Crutchfield Customer Review (What's this?)
 
Works fine
Pros:
Easy installation
Cons:
None
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4 out of 5

simple, sounds good.

Written By billy, auxvasse mo on Saturday, May 25, 2013
Crutchfield Customer Review (What's this?)
 
simple, works great.
Pros:
easy to install. works.
Cons:
having to buy to begin with.
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5 out of 5

Perfect replacement for GM09SR interface

Written By Angelo, Va Beach, VA on Tuesday, May 14, 2013
 
I had an Alpine 500CDA9856 deck in my 2004 GMC sierra, the old interface blew (it was a Scoshe GM09SR). I called up Crutchfield after almost 5 years of having the radio, and they walked me through the troubleshooting and gave me this new interface at half off. It arrived in 2 business days UPS ground, was relatively easy to install, the instructions were clear and the colors of the wires all match with my radio's harness. With a wire strippers, soldering iron, and tape and a little G2, you'll be able to get this wired up in no time. If all else fails, their tech support is on standby and willing to help, the simple fact that their techs answer the phone even at 9pm and have the answer to my issues even after five years has made me a lifetime customer.
Pros:
Easy to install, made in USA.
Cons:
N/A
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5 out of 5

Works Great,, Kepy My Factory Chimes, and Bose System.

Written By Bruce, Chicago, Il. on Wednesday, May 08, 2013
Crutchfield Customer Review (What's this?)
 
The GMOS-04 works very well, and I was able to keep my chimes, and use my current Bose Speaker System. Follow the directions, and if you have a problem, you can call tech support and they will talk you through it. All the wires are color matched, and simple to put together, If the chimes are too loud for your taste, the volume is adjustable. Forget about the bad reviews, and get this unit if you have chimes and a Bose Speaker System. You can also add a steering wheel control mudule as well if you desire. I decided I did not need it because my Head Unit came with a remote, so I am sastified. Great product, and Crutchfield sells it for half price with a purchased radio. Great Deal!!!
Pros:
Works great at factory setting, if connected as directed.
Cons:
None.
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4 out of 5

Adapters are a must for easy install

Written By Matthew, Minnesota on Tuesday, May 07, 2013
Crutchfield Customer Review (What's this?)
 
As much as I try to "save" money, these adapters are absolutely necessary to help retain your sanity - they make the installation of any stereo that much easier... I'm just glad they give us 50 percent off when we purchase it with the system! Read people had problems with some units - no problem with ours.
Pros:
Makes installation 5000 times easier and faster!
Cons:
Adds a little expense to your project (but worth it!)
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5 out of 5

great

Written By LAURAcr125, palmdale, CA on Monday, April 22, 2013
Crutchfield Customer Review (What's this?)
 
I missed my Pioneer!
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4 out of 5

Good product

Written By Anonymous, Lexington, SC on Wednesday, April 17, 2013
Crutchfield Customer Review (What's this?)
 
I am not a wiring expert. So the wiring could some how be made simpler like a website that matches all aspects together to tell you which wires to use and which wires you won't be using
Pros:
Works good
Cons:
Wiring instructions could be made simpler
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3 out of 5

ok

Written By Anonymous, DSM on Monday, March 25, 2013
Crutchfield Customer Review (What's this?)
 
took two unit to get it to work on my 01 grand am
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1 out of 5

low sound/ crappy highs

Written By alex, germany on Friday, March 15, 2013
Crutchfield Customer Review (What's this?)
 
it works but, i still am having trouble with my front speakers the quality of sound is unacceptable..
Pros:
chimes
Cons:
crappy sound from front speakers you have to increase the volume and it becomes distorted
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2 out of 5

Hopefully second one works better than first!

Written By Anonymous, Buffalo, MO on Tuesday, February 26, 2013
Crutchfield Customer Review (What's this?)
 
I had a factory stereo and Bose system and replaced stereo with a Pioneer AVH3400. After getting everything hooked up, it didnt seem to be near as good as my factory stereo which sounded awesome. The only reason I replaced the stereo was I wanted blutooth and ipod controls. Once installed, I'm getting virtually no sound from front speakers. I jumped around GMOS unit with front speaker wires (per Crutchfield tech support) and they sounded great. Credit Crutchfield for doing a great job helping determine the issue and trying to resolve it. We'll see when the replacment unit gets here. If it doesnt work, I'm just gonna bypass the speaker hookups on this thing.
1 out of 1 people found this helpful
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1 out of 5

JUNK JUNK JUNK

Written By Joshua, Twin Cities, MN on Thursday, February 07, 2013
Crutchfield Customer Review (What's this?)
 
I'm trying to install this GMOS-04 in a 2004 Grand Prix GTP, and the new interface makes my speakers pop when I turn the key from off to acc/on. Or when I open/close the door under certain situations. I've been on the phone with crutchfield at least 15 times to find a work around, and nothing. (Not their fault, this is a crappy product). After looking around online, and reading other forums and threads, I can see that I'm not the only one. It's still not fixed right now.
1 out of 1 people found this helpful
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5 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Anonymous, Moultrie, GA on Tuesday, February 05, 2013
Crutchfield Customer Review (What's this?)
 
Great
1 out of 1 people found this helpful
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3 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By Terrance, Church Point, La on Wednesday, January 23, 2013
Crutchfield Customer Review (What's this?)
 
I like that I can still use with my bose speakers and still have OnStar. The installers had a hard time getting the door chimes to work. I sometimes wish that part didnt work because the volume of the chimes is to loud.
Pros:
Still able to use OnStar and have bose speakers
Cons:
Door chimes is to loud. Compared to before Id say its 10xs louder. Which is not something I want to hear everytime I turn on truck or open door. I really hate that it's so loud!!!! Can you lower the volume??
Crutchfield response on Wednesday, January 23, 2013
We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.
1 out of 1 people found this helpful
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5 out of 5

Metra VT-GMOS-04 Factory Integration Adapter

Written By josh, pleasant view,tn on Saturday, January 05, 2013
Crutchfield Customer Review (What's this?)
 
got as a Christmas gift from parents, they ordered the wrong part, was able to return for correct one with even trade and postage paid return, my dad and i installed it in a few hours
1 out of 1 people found this helpful
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5 out of 5

gmos-04

Written By keith, groveport ,ohio on Tuesday, December 25, 2012
 
Great product,excellent tech support department.Thumbs' up for you guys.
1 out of 1 people found this helpful
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3 out of 5

No Steering Wheel Control

Written By B.L., Columbus, OH on Wednesday, August 15, 2012
Crutchfield Customer Review (What's this?)
 
Very disappointed that I lost my steering wheel controls. The product info is correct except for that one issue. Installers said I needed an additional component, so I opted not to. Maybe just an installation error, but future purchasers should doulble check.
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4 out of 5

Almost perfect

Written By Greg D., Kansas City, MO on Thursday, August 02, 2012
Crutchfield Customer Review (What's this?)
 
The instructions are very clear (except as some other reviewers have pointed out there are two red wires not the one mentioned in the instructions.) The only down side about it was my steering wheel controls are not doing anything after I did the install and that is one feature said to be maintained by the use of this device.
Pros:
You can maintain your onstar and chimes when moving to an upgraded stereo.
Cons:
Didn't maintain the steering wheel controls as advertised.
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4 out of 5

GM adapter

Written By stevem, fl on Friday, July 27, 2012
Crutchfield Customer Review (What's this?)
 
Works great, take your time and read directions a couple times before wiring. Put it in an 04 Chevy 3500.
Pros:
Keeps all factory chimes. allows volume adjustment for chimes.
Cons:
A lot of wiring and soldering. If you don't have any experience I would suggest a professional.
2 out of 2 people found this helpful
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4 out of 5

Works as advertised, not too bad to install

Written By oTurtlez, Scituate, RI on Thursday, July 12, 2012
Crutchfield Customer Review (What's this?)
 
The installation wasn't nearly as bad as I had anticipated. I just soldered the matching wires, and taped them up and it was good to go. The chime is close enough to the stock one, and my head unit works fine. If I need to buy a new head unit for another GM vehicle, I won't hesitate purchasing another GMOS.
2 out of 2 people found this helpful
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4 out of 5

Weak point of installation

Written By coachabk, Lake Jackson, Texas on Wednesday, July 04, 2012
Crutchfield Customer Review (What's this?)
 
Installed this in my '03 Chevy Avalanche. The instructions, as many others have stated, could use some improvement. If I were just installing this harness without the steering wheel control adapter, things would have gone fairly smoothly. However, I had to call Tech Support with a few questions along the was because there is a portion of the harness that looks real similar to the steering wheel control adapter that isn't used. I do which that the harness included a connection to the headlamp circuit that would have allowed the display to dim when the headlamps were activated.
Pros:
Plug and play.
Cons:
A bit confusing on wiring; no dimmer circuit.
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3 out of 5

Slow and Unsteady loses the race

Written By Cd, Anniston AL on Thursday, June 21, 2012
Crutchfield Customer Review (What's this?)
 
The GMOS for the most part provides an easy interface overall. However, it slows some feedback to the head unit down. Our install was going great till we encountered problems with the parking brake safety, etc. We later determined it was a result of the GMOS being slower than what the head unit was looking for. It's an overall necessity for GM vehicles, but can hinder your install time.
Pros:
Makes getting started easy.
Cons:
Slow feedback to head unit can paralyze some features
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4 out of 5

GM Factory Integration Adapter

Written By sid, schenectady, ny on Sunday, June 03, 2012
Crutchfield Customer Review (What's this?)
 
I Have installed many decks over the years, thats why i decided to try this my self. The only Issue i had was that most decks have a constant power, ignition power and a ground. The basic 3 wires that have to be hooked up, on the side that hooks to the deck there was 2 Ignition (red) wires. this was a little confusing the instal manual did not say weather to hook up both red wires to the deck ignition. I did anyway and it worked fine. this issue may need to be looked into. it was easy for me because of my history. but for somebody else may not be.
Pros:
Easy install
Cons:
need to be clearer on install.
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5 out of 5

GM factory intergation Adapter

Written By Tyson, queens NY on Friday, June 01, 2012
Crutchfield Customer Review (What's this?)
 
just what I needed works perfect my radio sounds even louder than before with my same bose system in my cadillac but with a aftermarket radio I still have onstar and all of my chimes. thanks
3 out of 3 people found this helpful
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1 out of 5

Absolute junk. Created DTC's

Written By Herb, Fort Wayne, IN on Sunday, May 27, 2012
Crutchfield Customer Review (What's this?)
 
Would pick zero stars if option. Installed and had no problems for about a week. After that my ABS, BRAKE, traction control and stability control lights kept coming on and going off, multiple times while I was driving. thought it may have been my install error. Double checked everything and it's all good. Removed and put factory back in, cleared all codes and haven't had a prob with the lights since. Trying to bypass the pack and get everything to work and have steering wheel control. Definitely not going to buy from that company again. Will continue to buy receivers from Crutchfield, but probably not much else. Very unsatisfied.
Pros:
Never had one for more that a week.
Cons:
Set codes and has noise through the speakers.
1 out of 1 people found this helpful
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4 out of 5

Installed in my 05 Chevy Tahoe

Written By BrossHawg, Ephrata, WA on Tuesday, May 22, 2012
Crutchfield Customer Review (What's this?)
 
This unit works well and does what it is supposed to. I would have given it 5 stars if it were not for an issue I had after installing. The blue potentiometer does more than just turn down the door chimes (which were very loud at the factory setting). If you turn down the door chimes with the stereo on, it also turns down the gain for the deck. I had the system sounding really good and the wife complained of the door chimes being too loud. In a hurry, I adjusted them down and reinstalled the deck and cleaned up (had to leave for a dinner date). After that, the sound was horrible, and I was pulling my hair out thinking I messed something up. After talking to a tech at Crutchfield, we figured out what happened. You have to turn the stereo off for 10 seconds and THEN adjust for the door chimes. Other than that, all is good.
Pros:
*Ease of installation *Functions as advertised
Cons:
*Directions could be more detailed (see above)
4 out of 4 people found this helpful
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5 out of 5

Worked Great! For Pontiac Grand Prix

Written By Benja, Illinois on Friday, May 04, 2012
Crutchfield Customer Review (What's this?)
 
Worked great with a JVC kw-R500 receiver and the Axxess ASWC steering controls in my 05 Grand Prix GTP with monsoon.
Pros:
Worked Great! The warning chimes and Onstar all worked properly and sounded like they were supposed to.
Cons:
The directions need to be written better.( until then you can call crutchfield.)
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4 out of 5

It does what its supposed to

Written By Michael, Ohio on Friday, April 13, 2012
Crutchfield Customer Review (What's this?)
 
I got this adapter for my 2006 Envoy Denali with Bose sound. It does what it says its supposed to integrating door chimes and onstar. I don't use onstar so that was not a big deal. I like being able to adjust the door chime level because even on the normal level with the factory radio they were loud and annoying. The Bose sound quality is not quite as clear as it was on my 2000 GMC Jimmy. Not sure if its because of the adapter or just the speakers. One major thing the instructions dont bother telling you is that when the chimes are not playing the adjustment acts as a gain control. This fixed a lot of my sound issues i was having at first with the distortion as many have stated in their reviews. Still not the Bose clarity i had in my old GMC so I may replace my speakers but doing so will not allow door chimes or onstar if you dont go through the factory amp. Hope this helped a few people. Overall it was easy to set up and Crutchfield is always great with service thats why i keep coming back.
Pros:
Easy Set up and adjustments.
Cons:
Needs a little more detail in instructions but if you have a little knowledge in car systems you should have no problem
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2 out of 5

GM wiring harness

Written By Clint, Leland, NC on Wednesday, March 21, 2012
 
This is one time you don't get what you pay for. Should have bought the wiring kit from a different retailer for $30 less that comes with the needed antenna adapter. Plus I got tricked into thinking the steering wheel adapter came with it since it shows the harness in the pic. Why would you include that section of harness (that comes with the ASWC unit) if not included??
Pros:
What actually did come in kit worked great. Chimes do sound different but I like the new sound better..seem deeper. Like the ability to adjust sound level of OnStar and chimes.
Cons:
Over priced and does not include antenna adapter. Instructions are useless since it doesn't tell you what ALL the wires are for, hope you have some install experience. Tells you to connect the red wire of one harness (that actually has two which need to be connected together) to the red wire of after market radio harness. Also says to connect orange and white which is no problem but doesn't tell you that the same color of wire on the other connector of harness ALSO needs to be connected.
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5 out of 5

Product worked Crutchfield support worked even BETTER!!

Written By SeanS, Trail BC Canada on Tuesday, March 06, 2012
 
Seen the previous negative reviews but things worked out perfectly for me. There have been faulty GMOS04 units but Crutch will always exchange a bad one to make you a happy customer. Installed it with a double DIN GPS deck in my 02 grand Am. Monsoon system no onstar. It retained my factory chimes, factory amp, and all functions. I did hit a snag though. After wiring it up it sounded awesome. However, I was only getting audio when the door was open?? The second I closed the door the audio would go mute yet the deck was still running. Open the door and the audio would come back? WTF?? Called tech fearing the worst. No offense but usually tech numbers are dudes reading trouble shooting tips off scripts. It was clear right away that tech knew what they were talking about. Anyways....solution from tech... I hooked the remote wire from the deck to the remote amp on the module, like you would a normal aftermarket amp and it works. Weird considering that remote wire is designed to power an aftermarket amp that I don't even have?? However it solved my problem and now audio works as it should opened or closed doors. In this day and age its extremely rare to be "taken care of after purchase" Crutch's techs came through and assured me if all else failed they would have replaced the item no questions asked. They went the extra mile while on the phone and me in my car troubleshooting.Great product?? That's not why I will be a returning customer. The service is why.Thanks
Pros:
worked for my 02 Grand Am as described
Cons:
Would agree with most reviews.......the instruction manual for is terrible!! Tough to follow
2 out of 2 people found this helpful
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5 out of 5

2003 Yukon with Bose

Written By