Axxess GMOS-LAN-012 GM Wiring Interface

Connect a new car stereo and retain the GM satellite radio, OnStar®, and factory safety warning chimes in select 2006-up GM vehicles

Item #: 120GMOSL12

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The Axxess GMOS-LAN-012 radio replacement interface lets you replace the factory radio in select 2006-up GM vehicles, and keep your factory-installed OnStar system, satellite radio tuner, and door chimes. Even if you don't subscribe to OnStar, you'll need this interface to connect an aftermarket stereo.

Connect the GMOS-LAN-012 to your aftermarket radio, mount the module, and plug it into the existing factory plug. Get the great sound you want, and keep all of the important safety features intact. You can adjust volume settings for OnStar as well as the safety chimes. 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.

This interface is compatible with select 2006-and up General Motors 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: Your vehicle must have factory-installed steering wheel controls in order to control the GM satellite radio tuner after installation.

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

Axxess GMOS-LAN-012 GM Wiring Interface Reviews

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Easy instillation

Written By Pat, Fort Washington, PA on Sunday, October 04, 2015

Crutchfield Customer Review (What's this?)

I would never believe installing the radio would be this easy

Pros: Every wire color coded to OEM radio, clear instructions and great tech support if you have a question. When I opened the box and saw the number of wires I thought I would never be able to get this right. One cal, and the tech told me it would all be very clear when I had the radio out and harness in front of me. He was right. I have used other install kits before none were ever this easy

Cons: None

Axxess GMOS-LAN-012

Written By Greg, Wisconsin on Wednesday, April 15, 2015

Crutchfield Customer Review (What's this?)

Got everything to work and pretty easy to install. Not a fan of how the factory SiriusXM works with the aftermarket radio. Also I get a "hissing" noise from all the speakers which I will have to get used to it seems. Other than that it does what its supposed to, just can't give it 5 stars because of these flaws.

Pros: Works as advertised Easy to install

Cons: SiriusXM Hissing from speakers

axxess GMOS-LAN 012

Written By rodneyfe, Chicago Illinois on Sunday, February 01, 2015

Crutchfield Customer Review (What's this?)

After dealing with best buy and getting the wrong product twice choose Crutchfield and I couldn't be happier the harness works perfectly now everything on my aftermarket radio works thanks for all your help you have a customer for life

Pros: Does everything it says it would

Cons: No cons

Axxess GMOS-LAN-012 GM Wiring Interface

Written By Derek, Rochester, NY on Tuesday, September 23, 2014

Crutchfield Customer Review (What's this?)

It works perfectly! Thanks Crutchfield

Meets expectations.... mostly.

Written By Jesse, Springfield, MO on Saturday, May 24, 2014

Crutchfield Customer Review (What's this?)

Overall, this harness was simple and straight forward to install. I haven't installed a stereo in 15 years, so I was a little worried going into it. The connections are straightforward and the manual was useful. I did call Crutchfield for a few questions, but they were mostly due to my inexperience and not wanting to make a mistake. I also love the way this thing integrates with the ASWC-1. By the time you are done, you have quite a bundle of a harness to fit behind your dash, but I was able to make it work. My biggest beef, and reason for docking a star, is that my factory XM tuner does not work as advertised. I have a 2006 Cadillac DTS, and was originally told this sucker would display XM on my driver information panel. The manual says this also, and that I can even change channels using the steering wheel controls. Well, I CAN listen to XM if I switch to AUX, but I have no visibility on my info panel, and can not change the station. Luckily, it was already set to the station I listen to 75% of the time. After calling Tech Support, I was basically told that factory integration of the XM tuner is dicey, and for full functionality I should just purchase an aftermarket tuner. Fortunately, I only paid half price for this harness as part of a bundle, or I would have been much more disappointed with this shortcoming.

Pros: Overall pretty easy to install. Integrates great with an ASWC-1.

Cons: Factory XM integration did not deliver as advertised.

Hands-on research

What's in the box?

Download owner's manual

  • GMLAN29 Data OnStar/Satellite Radio/Chime Retention interface module
  • GMLAN29 factory radio harness
  • Antenna adapter cable (AD-CR1)
  • 16-pin to composite video back-up camera harness
  • Installation Instructions

Product Research


Overview: The GMOS-LAN-012 is designed to retain OnStar, OEM Satellite Radio, and the warning chimes that are normally lost when a factory GMLAN29 radio is removed and provide a 12 volt accessory output for aftermarket radio operation. The GMOS-LAN-012 also provides a Mute, Parking Brake, VSS (Vehicle Speed Sensor), and a Reverse output to make installing an aftermarket navigation radio simple and less time consuming.

GM Vehicle Compatibility: The GMOS-LAN-012 is compatible with the following 2006-up GM vehicles (as of 2/28/2012):

Make Model Year
Enclave 2007-2011
Lucerne 2006-2011
Cadillac SRX 2007-2009
Escalade 2007-2011
DTS 2006-2010
Chevrolet Avalanche 2007-2011
Equinox 2007-2009
Express 2008-2011
Impala 2006-2011
Monte Carlo 2006-2007
Silverado 2007-2011
Suburban 2007-2010
Tahoe 2007-2011
Traverse 2009-2011
GMC Acadia 2007-2011
Savanna 2008-2011
Sierra 2007-2011
Yukon 2007-2011
Hummer H2 2008-2009
Torrent 2007-2009
Vibe 2009
Outlook 2007-2009
Vue 2008-2009
Suzuki XL-7 2007-2009

Note: Please consult Crutchfield's Outfit My Car to see if your vehicle is compatible and what additional accessories will be needed.

Backup Camera Harness: This harness is used when you are trying to retain the factory backup camera in your GM vehicle. The backup harness is fitted with a 16-pin GMLAN29 connector on one end and a male composite video RCA connector on the other end.

OEM Steering Wheel Control Compatible (optional): The GMOS-LAN-012 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 that also support steering wheel control.

Our Product Research Team

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