Name: Metra GMOS-04 Wiring Interface
Brand: Metra
SKU: 120GMOS04
Price: 139.99 CAD
Availability: InStock
Rating: 4 (316 reviews)

Overview

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

KEEP READING

Once you connect your in-dash receiver to the interface, 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 interface 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 interface to retain the warning chimes. Failure to do so may result in serious injury or death.

READ LESS

What's in the box:

Metra GMOS-04 Wiring Interface 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

MFR #GMOS-04

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Details

Researched by Crutchfield's Stacey B.

The Metra GMOS-04 Wiring Interface replaces these items:

Metra GMOS-02

Product Research

Features

Radio Replacement Interface: 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
Hummer	H3	2006-2009
Isuzu	Ascender	2003-2008
Isuzu	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: Radio information through the factory HUD (Heads-Up Dispaly) will be lost after installing an aftermarket radio, but vehicle information will still be retained.

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.

The Metra GMOS-04 Wiring Interface replaces these items

Metra GMOS-02

General Motors Class II data bus interface
Retains ONSTAR system, factory door chime, and Bose system with aftermarket radio

Lets you install an aftermarket receiver in late model GM vehicles without losing the door chime and audible safety warnings, the Bose amplified speakers, or the ONSTAR system

Accessories

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23 questions already asked

Will this work on my 2003 Chevy Trailblazer LTZ with Bose and onstar?

[ Landon Feb 26, 2022 ]

1 answer

It worked fine for my 2004 GMC Envoy SLT with Bose.

[ Caleb Feb 26, 2022 ]

Do I have to have steering wheel interface? Have a 2006 Trailblazer

[ Tiffany Feb 25, 2021 ]

2 answers

You don't have to if you don't need to have steering wheel contols on the new unit. I never have on all the new head units I've put in.

[ Scott Feb 25, 2021 ]

If you don't mind your steering wheel buttons not working. I suppose you could put that under personal preference.

[ Christopher Feb 25, 2021 ]

I'm taking out factory stereo with aftermarker pioneer, it has factory bose, and I'm gonna run a amp to double subs..in 2003 trailblazer..will this harness work?

[ Eugene Dec 23, 2020 ]

1 answer

Yes it should work just fine ! I thought I had gotten the wrong one but ,I had just forgot to put a wire together. Does what it needs to do

[ IGNACIO Dec 23, 2020 ]

Does the wiring harness come fully assembled when you purchase the radio?

[ Cole May 27, 2020 ]

2 answers

Bruce is correct! You can find more information on our ReadyHarness service here: www.crutchfield.com/p_264PASCON/item.html

[ Paul Jun 20, 2020 ] Staff

No. I also purchased Crutchfield's ReadyHarness Service to complete the build.

[ Bruce Jun 11, 2020 ]

Installed on my 2005 Chevy Silverado have power but no sound. Put stock radio back in and everything works. Has anyone ran into this before?

[ Joseph Apr 18, 2020 ]

1 answer

[ Krissy Apr 30, 2020 ] Staff

Will this work on my 2006 chevy trailblazer LT with bose and onstar?

[ SilentBill Jan 22, 2020 ]

2 answers

You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

[ Krissy Feb 06, 2020 ] Staff

I purchased this same product for my 2003 Chevy Avalanche with Bose and OnStar and it worked fine. I still had my chimes and everything

[ RODNEY Jan 22, 2020 ]

Will this work in my 2006 chevy trailblazer LT with bose and on star?

[ SilentBill Jan 22, 2020 ]

1 answer

I used it in my 05 Trailblazer with the same system

[ James Jan 22, 2020 ]

What do you do if your aftermarket radio doesnâ??t receive power I have a 2002 Pontiac grand am and I have it all wired up exactly how it goes but doesn't want to power it?

[ Travis Sep 25, 2019 ]

1 answer

Hi Travis, sorry to hear you're having trouble with your stereo. It will be hard to even give a good guess on what could be going on with that stereo. Did you purchase your gear from us here at Crutchfield? If you did make your purchase from us, our tech support team will be more than happy to go over everything with you, perform troubleshooting, and find the solution that will get your stereo up and running. You will find their number listed online when you log into your account, or it can also be found with the invoice/shipping confirmation email we would have sent you. If you did not purchase your gear from us, I suggest contacting technical support of the company you worked with, or the manufacturer of your stereo. If nothing can be found through those channels, you may need to speak with a local stereo installer, or mechanic in your area.

[ Jess Oct 09, 2019 ] Staff

Will this allow me to hook aftermarket radio and subwoofer in a 2002 gmc envoy with bose sound system?

[ Jacob Jul 18, 2019 ]

2 answers

It should I it worked perfect in my 02 trailblazer

[ Frankie Jul 19, 2019 ]

Yes I used it in my 07 Trailblazer ss with bose

[ Chris Jul 18, 2019 ]

i have a 2004 gmc envoy xuv with bose system with amp and onstar i got 2 different wiring harnesses connected everything and the radio has power but there is no sound from the speakers at all would this harness work?

[ ricky May 04, 2019 ]

1 answer

[ Krissy May 14, 2019 ] Staff

Will this work on a 2004 Sierra Denali with luxury Bose amplified sound system?

[ l Feb 06, 2019 ]

2 answers

Yes it should it worked on my Silverado with the Bose amp abs speakers

[ SCOTT Feb 08, 2019 ]

Your product adviser can answer this question, but I myself, will say yes. I have a 2009 HUMMER H3 Luxury Bose amplified system in it and also the OnStar system, although I don't use the OnStar. Very easy to install, but be sure to read the settings instructions as they have two different ways to set the sound of the door/warning chimes and a different way to set the volume for the stereo audio.

[ Darren Feb 06, 2019 ]

will this work on a 2008 gmc envoy with bose?

[ Frank Dec 11, 2018 ]

3 answers

I don't know about a 2008 Envoy. It worked on a 2006 Silverado.

[ Britt Dec 12, 2018 ]

Yes is a must

[ Angel A. Dec 12, 2018 ]

yes this should work on your 2008 bose system

[ MAUREEN Dec 11, 2018 ]

Can this kit be used to add aux 3.5 jack to an Envoy factory radio?

[ Ty Dec 05, 2018 ]

1 answer

This harness is used to install a new radio into a compatible vehicle. The 3.5mm plug is meant to work with the ASWC-1 steering wheel radio control interface. However, we might have an adapter to give your vehicle an aux audio input. I recommend contacting an advisor on 1-800-324-9695 to check for an aux input adapter My Bio: https://www.crutchfield.com/bio/Paul

[ Paul Dec 12, 2018 ] Staff

Will this retain my monsoon amp on my 2002 Pontiac grand am?

[ Carlos Feb 20, 2018 ]

1 answer

You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.

[ Krissy Mar 01, 2018 ] Staff

Will this fit a 2004 Grand Prix GT2 with the monsoon sound system and steering wheel controls? I am trying to install a Pioneer AVH-290BT double din radio. Thanks

[ Kyle Jul 02, 2017 ]

1 answer

[ Krissy Jul 03, 2017 ] Staff

Will this also maintain functionality of rear dvd entertainment system?

[ Scott Jun 11, 2017 ]

1 answer

[ Krissy Jun 11, 2017 ] Staff

Will my new radio still get power without the harness?

[ Biggie May 02, 2017 ]

2 answers

Your radio can get power without the harness, but the harness makes the installation so much easier.

[ D May 02, 2017 ]

No. Not unless you cut and splice your factory harness which I would not recommend at all.

[ PATRICK May 02, 2017 ]

Will it work on a 06 monte carlo ?

[ Mikey Mar 04, 2017 ]

1 answer

For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

[ Kenny Mar 04, 2017 ] Staff

I have the GMOS-04 connected today and all is well. I want to bypass the BOSE amp, install new amps and speakers, but maintain the chimes. If my head unit has the RCA's for the new amps (bypassing the BOSE), how can I wire this so the chimes still work, but don't get amp'd to some huge level like my speakers? Thanks, Jim A

[ Jim Jun 30, 2015 ]

2 answers

On the wiring harness is a level adjustment leave your door open and adjust it with door open it only Adjust the chime level with the door open close for to adjust music level

[ TIM Jul 03, 2015 ]

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.

[ Jeff Jul 01, 2015 ] Staff

I have a 2006 Corvette coupe with Bose (but no Onstar) and am wondering if this product will maintain the current Sirius/XM receiver or if I have to buy a new Sirius/XM receiver?

[ Netcruizer99 Mar 15, 2015 ]

2 answers

Thank you!

[ Netcruizer99 Mar 16, 2015 ]

For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

[ Krissy Mar 16, 2015 ] Staff

Will this harness connect the OnStar mic to the new head unit, or do I need to install the 2nd mic that came with the unit?

[ Dennis Feb 26, 2015 ]

1 answer

[ Krissy Feb 27, 2015 ] Staff

Will this work on my vehicle, 2003 Chevy Tahoe with Bose system? I do not have OnStar or steering wheel controls.

[ Jeremy Apr 16, 2014 ]

1 answer

For details on installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

[ Krissy Apr 16, 2014 ] Staff

do I need another adapter to keep the steering wheel control on my 2004 Pontiac Grand AM with monsoon amp?

[ John C Jan 05, 2014 ]

1 answer

The ability to retain steering wheel controls with aftermarket receivers will be determined by the receiver you are using and the vehicle you have. For full information on this type of integration (including the parts you will need) please contact an Advisor by phone or online chat.

[ Jeff Jan 06, 2014 ] Staff

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Metra GMOS-04 Wiring Interface

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

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About the Metra GMOS-04 Wiring Interface

What's in the box:

10 reasons to shop with us

Customer reviews

Metra GMOS-04 Wiring Interface reviews

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More details on the Metra GMOS-04 Wiring Interface

Product Research

Features

The Metra GMOS-04 Wiring Interface replaces these items

Customer Q&A

23 questions already asked

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