Name: Metra GMOS-01 Wiring Interface
Brand: Metra
SKU: 120GMOS01
Price: 109.99 USD
Availability: InStock
Rating: 4 (207 reviews)

by Crutchfield's Ken Nail

Metra's GMOS-01 interface lets you replace the factory radio in select OnStar-equipped 2000-up GM vehicles using the existing wiring and connectors. Even if you don't subscribe to OnStar, you'll need this interface to connect an aftermarket stereo.

KEEP READING

Hook the GMOS-01 to your aftermarket radio, mount the module, and plug it into the existing factory plug. Get the great sound you want, and keep all important safety features intact. And you can adjust volume settings for OnStar as well as the safety chimes. Also, once you turn off the ignition in these GM vehicles, the radio continues to play until you open the door. This interface maintains that function with your new aftermarket radio.

This interface is compatible with select 2000-up GM vehicles. If you haven't done so already, please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this item is compatible with your vehicle. Warranty: 1 year.

Note: The GMOS-01 will not work with factory-installed Bose car audio systems.

READ LESS

What's in the box:

Metra GMOS-01 Wiring Interface owner's manual

GMOS-01 Class II Data Bus interface
Wiring harness with 10-pin Molex on one end and bare wires on the other
Wiring Harness with 12-pin Molex on one end and 24-pin Molex and 12-pin Molex on the other (plus bare wires)
Installation instructions

MFR #GMOS-01

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Researched by Crutchfield's Stacey B.

Product Research

Features

Vehicle Compatibility: The GMOS-01 lets you install an aftermarket receiver in select late model GM vehicles without losing important factory features when the factory radio is removed. Its designed for non-amplified vehicle models, or when bypassing the factory amplifier.

Buick
- Century 2004-2005
- Lacrosse 2005-2009
- Rainier 2004-2007
- Regal 2004
- Rendezvous 2002-2007
- Terraza 2005-2007
CADILLAC
- Escalade 2003-2006
- Escalade ESV & EXT 2003-2006
Chevrolet
- Avalanche 2003-2006
- Cavalier 2000-2005
- Colorado 2004-2012
- Corvette 2005-2016
- Express 2003-2007
- Impala 2000-2005
- Kodiak C4500-C8500 2003-2009
- Malibu 2001-2003
- Malibu Classic 2004-2005
- Monte Carlo 2000-2005
- Silverado Classic 2007
- Silverado 2003-2006
- SSR 2003-2006
- Suburban 2003-2006
- Tahoe 2003-2006
- Trailblazer 2002-2009
- Uplander 2005-2008
GMC
- Canyon 2004-2012
- Envoy 2002-2009
- Savana 2003-2007
- Sierra 2003-2006
- Sierra Classic 2007
- TopKick C4500-C8500 2005-2009
- Yukon 2003-2006
- Yukon XL 2003-2006
Hummer
- H2
- H3 and H3t 2006-2010
Isuzu
Ascender 2003-2008
H-Series 2003-2008
I-Series 2006-2008
Oldsmobile
- Alero 2001-2004
- Bravada 2002-2004
- Intrigue 2002
Pontiac
- Aztec 2001-2005
- Grand Am 2001-2005
- Grand Prix 2004-2008
- Montana SV6 2005-2006
- Sunfire 2000-2005
Saab
- 9-7× 2005-2009
Saturn
- Relay 2005-2007

OnStar & Chime Retention: The GMOS-01 retains your vehicle's OnStar Emergency Services feature and the factory chime that warns the door is open. The volume is adjustable for both the OnStar output and the warning chime.

Retained Accessory Power (R.A.P.): The ignition power source of most GM vehicles keeps the radio on until one of the doors is opened. This feature is called the R.A.P. (retained accessory power). The GMOS-01 is designed to retain this feature.

NAV Outputs: The GMOS-05 also provides Parking Brake, VSS (Vehicle Speed Sensor), and a Reverse Output to make installing an aftermarket Navigation radio simpler and less time consuming.

OEM Steering Wheel Control Compatible (optional): The GMOS-01 features a right-angle 3.5mm connector that lets you keep your GM vehicle's OEM steering wheel controls via the optional Axxess Steering Wheel Control Interface (120ASWC1, sold separately).

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16 questions already asked

Iâ??m going to begging the Sony xav 5000 for my 2007 gmc classic 2500hd with on star will this work for the head unit and the pickup without any thing else?

kaden May 27, 2021

1 answer

This interface works in some versions of the 2007 GMC Sierra pickups and other installation parts are needed to complete the installation. I recommend contacting an advisor by calling 1-800-324-9695 to get a complete listing of all the parts needed to install it into your pickup

jason Jun 12, 2021 (Staff)

Iâ??m going to be getting the Sony xav 5000 for my 2007 gmc classic 2500hd with on star will this work for the head unit and the pickup without any thing else?or any problems

kaden May 27, 2021

4 answers

I highly recommend contacting the support staff at Cruthfield. They are truly excellent in helping people!

anthony May 28, 2021

Had no issues. Works as designed.

jason May 27, 2021

Yes it should, easy to put in, i paid for the wire assembly to be put together . It wont run on star unless you purchase the extra wire kit.

samuel May 27, 2021

My 2001 Chevy Venture has OnStar, but I'm not a subscriber. The wiring interface worked perfecty.

richard May 27, 2021

Is there an additional harness adapter to install pioneer fh-x70bt to Gmos-01. 04 Envoy XL ?

robertrangelak Feb 01, 2021

1 answer

We need to know more about your 04 Envoy XL to determine if you will need other adapters to complete this installation. Give us a call at 1-800-324-9695 and we will be happy to make sure you get the parts you need!

allison Feb 17, 2021 (Staff)

Are there any videos on installation to an aftermarket radio?

robertrangelak Feb 01, 2021

1 answer

I found tons of videos on youtube to familiarize myself with how to remove the old radio., And I was able to install my new radio in under an hour with the included instructions.

michael Feb 01, 2021

2012 Colorado how do i use existing onstar microphone?

mike Dec 27, 2020

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.

kristina Jan 08, 2021 (Staff)

After installing this, onstar audio only appears to be coming from the front left speaker. Is that expected? Other functionality of head unit is fine.

petey Aug 22, 2019

1 answer

Onstar and other vehicle sounds (door open chime, etc) only comes through the drivers side speaker even on OEM installations. This is normal.

william Aug 22, 2019

Will this fit a double dinPioneer AVH-W4400NEX?

avont Feb 03, 2019

1 answer

The Metra GMOS-01 is a wiring interface for compatible vehicles. It will work with most aftermarket stereo models; regardless of their chassis size (single or double DIN). For additional assistance and personalized recommendations, feel free to contact us directly by phone or through our online chat service: https://www.crutchfield.com/support/ContactUs.aspx

ryan Feb 06, 2019 (Staff)

want to put a new radio in my 2007 H3 Hummer . Will I need this?

calvin Dec 18, 2018

2 answers

If your vehicle is equipped with onstar yes, you will need this to retain all the features

brandon Dec 18, 2018

Yes definitly

arnold Dec 18, 2018

I have an '04 GMC Envoy, what is the 3.5mm plug used for? Can I plug it into the microphone port on my aftermarket radio and use the onstar microphone instead?

brad Jul 25, 2017

1 answer

kenneth Aug 01, 2017 (Staff)

Will this product allow me to install an aftermarket stereo to my 2011 Chevy Colorado Z71 with Onstar (no Bose) and keep Onstar, door chimes, and all other stock functions that are run through the stock harness?

stephen Sep 26, 2016

1 answer

kristina Sep 27, 2016 (Staff)

Will this harness retain my hands free phone option?

gary Jul 22, 2016

1 answer

kenneth Jul 22, 2016 (Staff)

this part Metra GMOS-01 will fit my 2003 GMC sierra 1500 SLT , i replace the factory cd to after maket cd-dvd-navigation will control by OEM steering wheel.So this part will do that?

khanh Apr 29, 2016

1 answer

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.

kenneth Apr 29, 2016 (Staff)

Is this compatible with a 2008 Gmc Envoy Denali? I have the Metra 71-2003-1 male harness. I want to replace the radio but I can't find a harness to match.

simsim Mar 29, 2016

1 answer

kristina Mar 29, 2016 (Staff)

I have a 2001 Chevy Impala LS with OnStar, How do I keep the ability to change my vehicle customization settings, like oil reset, low tire pressure, set remote audible and light verification settings after I install after market radio? Will this harness allow me to keep making changes or reset tire pressure and oil life indications?

rick Jan 01, 2016

1 answer

kenneth Jan 01, 2016 (Staff)

radio not dimming with dash control dimmer GMOS 01 AVIC 6000NEX 2006 Envoy?

d Apr 18, 2015

1 answer

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. 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/.

kristina Apr 18, 2015 (Staff)

If I am adding a new head unit, one amplifier for a newly-added subwoofer, and one amplifier to power the existing door speakers, is there any need in adding this module? I'm not sure that I quite see how this module would connect to the speakers if I am using an amp to power the speakers.

michael Dec 28, 2013

5 answers

Though late in the game this is what I have learned and hope it benefits everyone. The module can be used with amps, BUT you must bypass the module of the amp power and get an additional speaker for the warning chimes (Metra SP-2003 sadly not found at Crutchfield). On my 2004 Chevy Colorado I tried using one of the tweeters that I removed (when I upgraded to components) for the chime but it was too quiet whether it was wired before or after the inline resistor. Metra has specific instructions for using this module with amps on page 7 of the owners manual. I do NOT have OnStar so have no idea how this would play in, but if you want your warning chimes on a NON-OnStar vehicle then it appears getting the Metra SP-2003 (or possibly any 12V speaker with a good volume level) appears to be the only route to take when using amps and the Metra GMOS-01. I plan on ordering the SP-2003 in the near future but for now this is the best I have to offer. I do not pretend to know everything, or anything, but this is what my research has come up with and hope it helps any one looking for the same answers I had about the "amp" situation.

lloyd May 28, 2014

Hi, I didn't added an amp to my car, but I'm using the module, I have a 2005 buick lacrosse equipped with on-star. This module helps you keep the door chimes sound for door opens, or seat bealt alerts. Also keeps a Connction going from the radio to the rear view visor that has the built-in Mic in order to talk to the on-star assistant. The radio I bought with this module has its own Mic which I use for phone calls using the Bluetooth service. Hope this information helps.

ranses a Dec 31, 2013

Hi Mike, This unit doesn't have line level inputs or outputs. Provided the unit can handle the additional power of the amplifier, you could hook it up post amp. The purpose of this unit is to allow the OnStar system to use your speakers for communications. If you are wiring head unit-amp-speaker and bypassing the factory wiring and you are not worried with your OnStar the you really don't need it. Hope this helps Will MECP certified installer

william Dec 29, 2013

Mike M, I installed this in a GMC Envoy XL using just the standard speakers. I believe the adapter was required for maintaining the OnStar capabilities thru the new head unit. Unfortunately I didn't add additional amplifiers like you are but I believe the wiring would still be similar to the diagrams provided. I probably didn't give you much help with my answer but I think you should try to keep the adapter in the setup. I wired and soldered everything before hand before I even went out to the car so everything plugged in nicely once I got started. Good luck!

c. scott Dec 28, 2013

The wiring harness makes this much easier to splice into the factory system - I suppose you CAN do it without but you'll have a lot more heartache and virtually no complications this way. This helps you retain OnStar and the door chime which will both disappear if you do not use this. There is also a PAC unit for GM cars that also works but you do not retain OnStar or the chime - which is the route I went. I have a Hummer H3 and this was necessary as the car had an external amp for the separates and no subwoofer. I added a sub (JL Audio Stealthbox) and new amp to replace the factory amp and a whole new amp for the sub.

eric t Dec 28, 2013

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Metra GMOS-01 Wiring Interface Connect a new car stereo and retain OnStar®, factory door chimes, and audible safety warnings in select GM vehicles

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