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Axxess GMOS-100 GM Factory Integration Adapter

Connect a new stereo and retain OnStar®, Bluetooth®, factory amp, warning chimes, and steering wheel controls in 2000-up GM vehicles

Item # 120GMOS100

You want to install a new car stereo in your 2000-up GM vehicle, but you don't want to lose useful factory...

Find what Fits your car

You want to install a new car stereo in your 2000-up GM vehicle, but you don't want to lose useful factory...

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Discontinued item

Item # 120GMOS100

Trevor
Need help?
Contact our Virginia-based experts.

About the Axxess GMOS-100 GM Factory Integration Adapter

You want to install a new car stereo in your 2000-up GM vehicle, but you don't want to lose useful factory functions. Thanks to this Axxess adapter, you can upgrade to the higher sound quality of an aftermarket receiver while maintaining your factory-installed satellite radio tuner, OnStar®, Bluetooth®, factory amplifier, and steering wheel audio controls. In some vehicles, you can also retain your factory rear seat entertainment system and your GM backup camera. All harnesses are included, and this interface works with both amplified and non-amplified GM factory systems.

You want to install a new car stereo in your 2000-up GM vehicle, but you don't want to lose useful factory functions. Thanks to this Axxess adapter, you can upgrade to the higher sound quality of an aftermarket receiver while maintaining your factory-installed satellite radio tuner, OnStar®, Bluetooth®, factory amplifier, and steering wheel audio controls. In some vehicles, you can also retain your factory rear seat entertainment system and your GM backup camera. All harnesses are included, and this interface works with both amplified and non-amplified GM factory systems.

The package includes the GMOS-100 module, the 22-pin to 30-pin GMLAN29 harness, the 22-pin to 30-pin GMLAN1 harness, and the 22-pin to 24-pin CLASS II harness. The package also includes the16-pin backup camera harness and the 16-pin rear-seat entertainment system harness, but you can only retain those features in GM vehicles compatible with the GMLAN29 harness (see the Details tab for compatibility chart).

Installation Note: If you plan on keeping the GM satellite radio tuner and your GM vehicle does not have a Driver Information Center screen, you'll need to buy a separate dash-mount screen to display satellite radio and iPod info.

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Product highlights:

  • works with GM vehicles with the CLASS II, GMLAN 11, or GMLAN 29-bit data systems
  • works with amplified and non-amplified systems
  • also allows you to retain GM satellite radio tuner in select models
  • retains rear-view camera and rear-seat entertainment system in select vehicles (new receiver must have camera input and RCA inputs)
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # GMOS-100

What's in the box:

  • GM Steering Wheel Control module (GMOS-100 interface)
  • 4-pin to 4-pin resistor pad harness (LD-GMOS100RPAD)
  • 22-pin to 30-pin LAN 29 wiring harness (LD-LAN29-100-2)
  • 22-pin to 30-pin GMLAN 11 wiring harness (LD-LAN11-100-2)
  • 22-pin to 24-pin Class II wiring harness (LD-CL2-100-2)
  • 16-pin Backup camera harness (with composite video RCA connector)
  • 16-pin RSE harness (LD-GMRSAV)
  • 16-pin harness with stripped leads (LD-2NAVAMP)
  • Female 3.5mm harness (LD-SWC-F3.5)
  • Resistor (tucked in manual)
  • Instructions

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More details on the Axxess GMOS-100 GM Factory Integration Adapter

Stacey B.

Product Research

Adapter Features
Class II Harness
GMLAN 11 Harness
GMLAN 29 Harness
Installation Notes

Adapter Features

Overview: The GMOS-100 is a GM all-in-one solution to add an aftermarket radio to select 2000-up GM vehicles with the CLASS II, GMLAN 11, or GMLAN 29 bit data systems. The GMOS-100 can be used to retain your factory amplifier, OnStar, Bluetooth, Satellite Radio (factory D.I.C. or optional LCD required), steering wheel controls, rear-seat entertainment (GMLAN 29 harness only; depending on type of vehicle), and factory backup camera (GMLAN 29 harness only; depending on type of vehicle). In addition, all the warning chimes and convenience features are retained that are normally lost when the OEM radio is removed. The GMOS-100 also provides a 12-volt/10-amp accessory output and connections to help install a navigation radio which include VSS, Parking Brake, and Reverse (rear-view camera).

Note: There are three types of GM harness included (CLASS II, GMLAN 11 bit, and GMLAN 29 bit). Only one will be used for your specific vehicle. Please consult Crutchfield's Outfit My Car to see if your vehicle is compatible and what additional accessories will be needed.

Class II Harness

Class II Harness Compatibility Chart: The included Class II harness is compatible with the following 2000-up Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, Saab, and Saturn vehicles (as of October 2012):

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
Escalade EXT 2003-2006
Chevrolet Avalanche 2003-2006
Cavalier 2000-2005
Corvette 2005-up
Express 2003-2007
Impala 2000-2005
Malibu Classic 2004
Monte Carlo 2000-2005
Silverado 2003-2006
Silverado Classic 2007
SSR 2003-2006
Suburban 2003-2006
Tahoe 2003-2006
Trailblazer 2002-2009
Uplander 2005-2008
GMC
Envoy 2002-2009
Savanna 2003-2007
Sierra 2003-2006
Sierra Classic 2007
Yukon/XL/Denali 2003-2006
Hummer H2 2003-2007
H3 2006-2009
Isuzu Ascender 2003-2008
I Series 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
Sunfire 2000-2005
Saab 9-7x 2005-2009
Saturn
Relay 2005-2007

Class II Harness Feature Set:

  • 10-Amp ACC 12v output
  • Retains all factory warning chimes
  • Retains OnStar *
  • Retains factory amp *
  • Retains Steering Wheel Controls *
  • Retains factory Bluetooth *
  • Retains factory Satellite Radio (RCA AUX input and separate XIA-LCD required)
  • Provides Navigation outputs (VSS, Park Brake, Reverse signal)
Note: *If equipped

GMLAN 11 Harness

GMLAN 11 Harness Compatibility Chart: The included GMLAN II harness is compatible with the following Chevrolet, Pontiac, and Saturn vehicles (as of October 2012):

Make Model Year
Chevrolet Cobalt 2007-2010
HHR 2006-2011
Malibu 2008-2012
Pontiac G5 2007-2009
G6 2009-2010
Solstice 2006-2009
Saturn Aura 2007-2009
Sky 2007-2009

GM 11-Bit LAN Harness Feature Set:

  • 10-Amp ACC 12v output
  • Retains all factory warning chimes
  • Retains turn signal indicators via pre-wired relay
  • Retains OnStar *
  • Retains factory amp *
  • Retains Steering Wheel Controls *
  • Retains factory Bluetooth *
  • Retains factory Satellite Radio (RCA AUX input and separate XIA-LCD required)
  • Provides Navigation outputs (VSS, Park Brake, Reverse signal)
Note: *If equipped

GMLAN 29 Harness

GMLAN 29 Harness Compatibility Chart: The included GMLAN 29 harness is compatible with the following 2006-up Buick, Cadillac, Chevrolet, GMC, Hummer, Pontiac, Saturn, and Suzuki vehicles (as of October 2012):

Make Model Year
Buick
Enclave 2008-up
Lucerne 2006-2011
Cadillac SRX 2007-2009
Escalade 2007-up
DTS 2006-2011
Chevrolet Avalanche 2007-up
Equinox 2007-2009
Express 2008-up
Impala 2006-up
Monte Carlo 2006-2007
Silverado (new body) 2007-up
Suburban 2007-up
Tahoe 2007-up
Traverse 2009-up
GMC Acadia 2007-up
Savanna 2008-up
Sierra (new body) 2007-up
Yukon 2007-up
Hummer H2 2003-2009
Pontiac
Torrent 2007-2009
Saturn
Outlook 2007-2009
Vue 2008-2009
Suzuki XL-7 2007-2009

GM 29-Bit LAN Harness Feature Set:

  • 10-Amp ACC 12v output
  • Retains all factory warning chimes
  • Retains turn signal indicators via pre-wired relay
  • Retains factory backup cam (video unit with rear cam RCA input required)
  • Retains Rear Seat Entertainment (rear-panel RCA AUX input required)
  • Retains OnStar *
  • Retains factory amp *
  • Retains Steering Wheel Controls *
  • Retains factory Bluetooth *
  • Retains factory Satellite Radio (RCA AUX input required, D.I.C. and factory SWC required, otherwise XIA-LCD must be used)
  • Provides Navigation outputs (VSS, Park Brake, Reverse signal)
Note: *If equipped

Installation Notes

Satellite Radio Note: Your factory Satellite Radio information will continue to be displayed through your vehicle's factory Driver Information Center (D.I.C.). This factory D.I.C. is not removed when replacing your factory radio with your new aftermarket head unit. If your vehicle is not equipped with a separate Driver Information Center and the factory radio displays all Satellite Radio information, you will lose Satellite Radio text, unless you purchase the XIA-LCD (120XIALCD, sold separately), which provides a separate LCD screen from your new aftermarket stereo and allows you to navigate through factory installed Satellite Radio options.

Note: Vehicles that require the GMLAN29 harness still allow you to control your factory Satellite Radio through your vehicle's factory steering wheel controls, even without the Driver Information Center; but you will lose text display.

OEM Steering Wheel Control Compatible: The GMOS-100 features a 3.5mm connector that lets you keep your GM vehicle's OEM steering wheel controls when installing a compatible aftermarket radio.

Level Adjustments: The GMOS-100 provides chime/turn signal volume adjustment, overall gain level adjustment, and OnStar level adjustment.

  • Chime/Turn Signal Volume Adjustment: To adjust the chime volume, use a small screwdriver to rotate the module's potentiometer (located on the 8-pin harness side of the interface; closest to 8-pin harness). Turn clockwise to make the chime/turn signal louder and counterclockwise to make the chime/turn signal softer. Turn signal will not be affected in non-amplified or class II systems.
  • Overall Gain Level Adjustment: To adjust the overall audio volume of your vehicle, use a small screwdriver to rotate the potentiometer, located on the 8-pin harness side; furthest away from 8-pin harness). Turn clockwise to make gain louder and counterclockwise to make the gain softer.
  • OnStar Level Adjustment: To adjust the OnStar volume level, find the Black/Yellow wire on the 20-pin harness. Push the blue OnStar button, while the voice is speaking tap the Black/Yellow wire to ground. There are 4 volume settings for OnStar; once the 4th setting is reached and the Black/Yellow wire is tapped to ground it will automatically go back to the first volume setting. Once the volume is set, it will stay at that volume until the Black/Yellow wire is tapped to ground again. This can be set during installation and then left alone. If user adjustment is desired, a momentary contact switch (sold separately) can be added. Connect one terminal from the switch to ground and the other terminal to the Black/Yellow wire. The volume will change one level every time the switch is pressed.

RSE/Backup Camera Note: The GMOS-100 only retains factory RSE (rear seat entertainment) and backup camera in select vehicle's which require the GMLAN29.

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