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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

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

Find what Fits your car

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

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Item # 120GMOS044

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$179.99
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About the Axxess GMOS-044 Wiring Interface

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.

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.

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What's in the box:

  • 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
MFR #GMOS-044

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Axxess GMOS-044 Wiring Interface reviews

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14 reviews

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Axxess GMOS-044 Wiring Interface

Crutchfield customer from East Providence, RI on 8/7/2019

2014 Chevrolet Equinox

Verified customer (What's this?)
Verified employee purchase (What's this?)

Installed it on my 2014 Chevy Equinox LS. No issue what so ever. I had Crutchfield do the cable assembly which made the job a lot easier.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Ok but...

Guest from Wausau, WI on 7/11/2019

2016 Chevrolet Cruze Limited

Verified customer (What's this?)
Verified employee purchase (What's this?)

Honestly wanted to like it but now the screen above the HU goes to car settings randomly and drives me up the wall, plus if you want to amp your speakers the factory chimes go through one of the front spealers so it will be amplified, if I had it to do all over again I would spend 40-50 bucks more and get the idatalink rr and gm install kit.

Pros: Works kinda

Cons: Starting to do quirky things

Crutchfield response on

1 of 1 found this helpful

Axxess GMOS-044 Wiring Interface

Crutchfield customer from Mc Calla, AL on 3/3/2019

2014 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (What's this?)

So a lil advice if installing in gm and is plugged in the radio comes on without key you need to attach ground cable and will work as supose to and if you add steering wheel adapter it may take a few restarts to program

Pros: Keep factory screen working and all chimes and sounds working

Cons: Not great install guide needs more details

Crutchfield response on
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0 of 0 found this helpful

Axxess GMOS-044 Wiring Interface

Crutchfield customer from Bruceville, IN on 12/27/2018

2012 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (What's this?)

Works but hard to get all the Harness back up in a dash with the radio and heater controls

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Axxess GMOS-044 Wiring Interface

Crutchfield customer from Bradenton, FL on 7/12/2018

2012 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (What's this?)

Spent the better half of my week and a half trying to figure out the wiring, then come to find out that you have to guess most of the wiring so that sucks. The fact that I had to do continuous revisions to the wiring harness and to see that all it did was do half job shows that this harness needs revision because it doesn't work properly. I want a refund

Pros:

Cons:

Crutchfield response on 7/16/2018
Once we saw this review, our Tech Support team reached out to this customer to help him further. We'll either help him get the interface working the way it should, or help him return it for an exchange or refund.

0 of 0 found this helpful

Everything I needed

Jesse from Wausau, WI on 4/1/2018

2016 Chevrolet Cruze Limited

Verified customer (What's this?)
Verified employee purchase (What's this?)

Great item, easy to install if you have a common grasp of matching colors and reading the diagram, everything works on my chevy cruze limited except the steering wheel controls and xm radio which im not crying over. You can adjust your time and date, and other vehicle settings using your steering wheel controls just youtube or google how and its easy.

Pros: Simple to install

Cons: Kind of clunky and stiff, would be better if they didn't tessa tape it into oblivion.

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0 of 0 found this helpful

Axxess GMOS-044 Wiring Interface

Crutchfield customer from Elgin, IL on 9/22/2017

2012 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (What's this?)

Once I figured out how it all fit together (thank you Dempsey from technical support) it was easy. Had some issues with a defective module but it was replaced and we were off and running.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Great Harness

Enrique from Denver, CO on 6/13/2017

2014 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (What's this?)

This harness and the associated mass of wires works flawlessly combined with the Sony XAV-712HD, in my 2014 Chevy Cruze LT/RS. And be sure to read the diagram, it shows you exactly how the wires connect.

Pros: Easy to follow diagram. Works perfectly

Cons: Takes up space. More of a my vehicle design issue, but it tucks away.

Crutchfield response on

1 of 1 found this helpful

Excellent bypass harness

Michael from San Diego, CA on 9/11/2016

2012 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (What's this?)

This harness just worked, it interfaces with the OnStar. Everything works in the car, all the chimes, all the displays all of the buttons. Simply fantastic.

Pros: Everything works all of the connections are present

Cons: So far, none, everything just works

Crutchfield response on

0 of 0 found this helpful

Great integration

Erik from Auburn NY on 5/12/2016

2013 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (What's this?)

Decent install time, good sound retention. Makes squealing noises when vehicle first starts up.

Pros: Easy install. Retains function of monochrome display for the econ and external temp display.

Cons: Ground wire for the gmos box is far far to sensitive to system noise from the head unit it self.

Crutchfield response on

0 of 0 found this helpful

Great Instructions and Easy To Install

Richard from St. Charles MO on 2/19/2016

2012 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (What's this?)

Works great easy to install thanks to the wonderful people that work at Crutchfield

Pros: Free download of manual and install instructions

Cons: Alot of wires all hooked together in one big wire harness was a little overwhelming at first

Crutchfield response on

0 of 0 found this helpful

Axxess GMOS-044 Wiring Interface

nupatriot from Maine on 4/18/2015

Verified customer (What's this?)
Verified employee purchase (What's this?)

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

Pros: None

Cons: waste of money and time

Crutchfield response on

0 of 1 found this helpful

Solid interface.

Crutchfield customer from Denver, CO on 2/22/2015

2011 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (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

Crutchfield response on

0 of 0 found this helpful

it adapts

Bill H from Lexington, KY on 3/4/2014

2011 Chevrolet Cruze

Verified customer (What's this?)
Verified employee purchase (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.

Crutchfield response on

1 of 2 found this helpful

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Pros:

Cons:

Crutchfield response

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More details on the Axxess GMOS-044 Wiring Interface

Stacey B.

Product Research

Features

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.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Need to wire my new radio to my vehicle. [ Cruz  Apr 07, 2019 ]
A
Needed to retain all my factory annoying dings. [ Zach  Mar 02, 2019 ]
A
Needed for install [ Dakota  Dec 01, 2017 ]
A
Wanted to keep the install as simple as possible. [ Eddie  Sep 02, 2017 ]
A
Retains factory amp in Chevy Cruze and onstar and all warning chimes. Also alows the factory radio screen to be customized to say anything you want! [ Travis  Sep 22, 2016 ]
A
needed this as well [ William  Sep 15, 2016 ]
A
to have all the abilities this stereo has to offer. [ Tristan Michael  May 04, 2016 ]
A
need to install aftermarket radio [ Erik  Apr 29, 2016 ]
A
My car called for it to hook up aftermarket stereo [ Richard  Feb 17, 2016 ]
SHOW MORESHOW LESS

3 questions already asked

Q
Does this retain the color factory display in the ltz model 2014 chevy cruze? I don't see several of the required connectors that run to the display.
[ Robert  Jun 06, 2019 ]
3 answers
A
yes it retains the factory display but not the color.
[ janice  Jun 07, 2019 ]
A
If you are asking about the display that shows temps and time, then yes. it works. although you need to set it from the steering wheel controls. I googled the procedure.
[ Eddie  Jun 06, 2019 ]
A
Yes it does. Everything is color coded.
[ IRWIN H  Jun 06, 2019 ]
Q
Does this retain the monochromatic display?
[ Vegaman434  Mar 10, 2019 ]
1 answer
A
Yes listen to these guys they have been a great help on all levels
[ RICHARD  Mar 10, 2019 ]
Q
Does it support rear parking assist sensor warning sounds?
[ Darrell  Mar 30, 2014 ]
1 answer
A
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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