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Axxess GMOS-044 Wiring Interface

Connect a new car stereo and retain OnStar® and safety warning chimes in select 2011-up GM vehicles

Item #: 120GMOS044

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3 Reviews | 1 question - 1 answer

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The Axxess GMOS-044 GM interface lets you replace the factory radio in select OnStar-equipped 2011-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.

Connect the GMOS-044 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 2011-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: 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-044 Wiring Interface Reviews

Average Customer Review:

3 Reviews

Axxess GMOS-044 Wiring Interface

Written by: nupatriot from Maine on April 18, 2015

Terrible product to install. the directions were incomplete. Chimes, dings and Aux display do not function.

Pros: None

Cons: waste of money and time

Solid interface.

Written by: Anonymous from Denver, CO on February 22, 2015

2011 Chevrolet Cruze
Crutchfield Customer Review (What's this?)

The interface works as it should. It retains factory functions and is easy to connect. One recommendation is that if you don't have factory steering wheels controls, get the control stalk from Axxess. If you don't you won't be able to adjust date and time on the factory display rendering the unit useless other than the factory chimes.

Pros: None

Cons: None

it adapts

Written by: Bill H from Lexington, KY on March 4, 2014

2011 Chevrolet Cruze
Crutchfield Customer Review (What's this?)

i still have the main display in my chevy cruze hooked up. it is annoying because i cant change the date or time or anything.

Pros: it kept the door chimes and turn signal clicker sound.

Cons: can't adjust any settings.

Hands-on research

What's in the box?

Download owner's manual

  • GM OnStar/chime retention interface module
  • Connecting harness with multiple connectors: 22-pin / 16-pin / 12-pin / 30-pin / 2 RCAs / Minijack / Relay
  • Installation Instructions

Product Research


Overview: The GMOS-044 lets you replace the factory radio in select GM vehicles with an aftermarket head unit. It works in both amplified and non-amplified factory audio systems and is designed to retain OnStar and the warning chimes that are normally lost when the OEM radio is removed. It also provides a 12-volt accessory output for aftermarket radio operation. Additionally, the GMOS-044 provides a Mute, Parking Brake, VSS (speed sense), and Reverse outputs to make installing an aftermarket navigation unit less time consuming.

Vehicle Compatibility: The GMOS-044 works in select GM vehicles. Please consult the Crutchfield Car Selector to confirm compatibility with your specific vehicle.

OEM Steering Wheel Control Compatible (optional): The GMOS-044 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 & Chime Volume Adjustment: The volume is adjustable for both the OnStar output and the warning chime.

Our Product Research Team

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Customer Q&A

1 question already asked

Good question! However I am not sure if it retains the reverse warning chime. My car doesnt have that feature. I would suggest you give a call into axxess support before you buy. Their number can be found on axxessinterfaces dot com. they have much more know how on these gmos harnesses than Crutchfield support does. They can be tricky. I tried doing it myself once and it didn't work out well. Crutchfield sent me a replacement and I just broke down and had the local big box store put it in for 95 bucks. Works flawlessly now. Don't know if it was me or the first unit I had. Oh well. Good luck! [ Michael  Mar 31, 2014 ]

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