Axxess GMOS-100 Installation Instructions

Introduction

The Axxess GMOS-100 is a vehicle integration interface designed to allow the installation of an aftermarket radio into GM vehicles equipped with CLASS II, GMLAN 11, or GMLAN 29 bit data systems. This interface retains essential vehicle features such as warning chimes and convenience functions that are typically lost when the OEM radio is removed. It is compatible with vehicles that are amplified or non-amplified and retain features like satellite radio, Onstar, Bluetooth, and steering wheel controls. The GMOS-100 also provides a 12-volt 10-amp accessory output and outputs for navigation radios, including VSS, Parking Brake, and Reverse.

Applications

The GMOS-100 is compatible with a wide range of Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, Saab, Saturn, and Suzuki vehicles from various model years. Please refer to the detailed application list within the original document for specific vehicle compatibility.

Interface Components

The GMOS-100 package includes:

• GMOS-100 Interface
• 4-pin harness with stripped leads
• 22-pin to 30-pin GMLAN29 harness
• 22-pin to 30-pin GMLAN11 harness
• 22-pin to 24-pin CLASS II harness
• 16-pin Backup camera harness (for GMLAN29 vehicles only)
• 16-pin RSE harness (for GMLAN29 vehicles only)
• Female 3.5mm connector with Brown and Brown/White wires

Tools Required for Installation

• Cutting Tool
• Tape
• Crimping Tool
• Connectors (e.g., butt-connectors, bell caps)

Installation Instructions

Important Safety Note: Before beginning any installation, disconnect the negative battery terminal to prevent accidental short circuits.

GMLAN29 Instructions

Installing The Interface

• From The 20 Pin Harness:
• Connect the Red wire to the ignition/accessory wire of the aftermarket radio.
• Connect the Orange/White wire to the illumination wire of the aftermarket radio. If the aftermarket radio lacks an illumination wire, tape off the Orange/White wire.
• Connect the Blue/White wire to the amp turn-on wire of the aftermarket radio.
• Connect the Brown wire to the mute wire of the aftermarket radio. If the aftermarket radio does not have a mute wire, tape up the Brown wire.
• The Black/Yellow wire will be discussed later in the instructions.

For Non-Amplified Systems:

• Connect the White wire to the left front positive speaker output of the aftermarket radio.
• Connect the White/Black wire to the left front negative speaker output of the aftermarket radio.
• Connect the Gray wire to the right front positive speaker output of the aftermarket radio.
• Connect the Gray/Black wire to the right front negative speaker output of the aftermarket radio.

For Amplified Systems:

• Connect the White RCA to the left front low-level output of the aftermarket radio.
• Connect the Gray RCA to the right front low-level output of the aftermarket radio.
• Connect the Green RCA to the left rear low-level output of the aftermarket radio.
• Connect the Violet RCA to the right rear low-level output of the aftermarket radio.

Wires for Aftermarket Radios with Navigation:

• Connect the Green wire to the parking brake wire of the aftermarket navigation radio.
• Connect the Blue/Pink wire to the VSS or speed sense wire of the aftermarket navigation radio.
• Connect the Green/Purple wire to the reverse wire of the aftermarket navigation radio.

From The 22 Way Harness:

• Connect the Black wire with the ring terminal to the back of the aftermarket radio's chassis.
• Connect the 3.5mm jack to your aftermarket radio's steering wheel control input (if equipped).
• Note: If using an Eclipse or Kenwood radio, use the supplied female 3.5 adapter.
• For Kenwood radios: Connect the Kenwood SWC wire (normally Blue/Yellow) to the Brown wire of the GMOS-100. Isolate and tape the Brown/White wire.
• For Eclipse radios: Connect the Eclipse SWC wires (Normally Brown and Brown/Black) to the Brown and Brown/White wires of the GMOS-100. Brown connects to Brown, and Brown/White connects to Brown/Black.

From The 30 Way Harness:

• Connect the Black wire to the ground wire of the aftermarket radio.
• Connect the RCA's on the 8-pin harness to the AUX input on the aftermarket radio (if equipped). Satellite information will be displayed on the DIC.
• Connect the Yellow wire to the constant wire of the aftermarket radio.

GMLAN29-100 Setup for Amplified Systems:

• If the vehicle is not amplified, disconnect the 4-pin harness located between the 30-way and 22-way connectors.
• Connect the supplied 4-pin speaker harness and connect the following:
• Connect the Violet wire to the right rear positive wire of the aftermarket radio.
• Connect the Violet/Black wire to the right rear negative wire of the aftermarket radio.
• Connect the Green wire to the left rear positive wire of the aftermarket radio.
• Connect the Green/Black wire to the left rear negative wire of the aftermarket radio.

Installing The GMLAN29-100:

• With all connections completed, plug the 20, 22, and 8-pin harnesses into the GMOS-100.
• Reconnect the negative battery terminal.
• Plug the 30-pin GM harness into the vehicle side harness, and plug the aftermarket radio harness into the aftermarket radio.
• Cycle the key by turning the ignition on, then back off, then back on again to test the radio.

Programming SWC (Steering Wheel Controls)

• Turn on the ignition.
• Turn on the aftermarket radio.
• The LED on the GMOS-100 will begin to blink rapidly.
• Press the following buttons in order: Volume Up, Seek Up, Band, PTT/Mute, Fan Up. Each button press will be acknowledged with the LED on steadily.
• If a button is not present on the vehicle's steering wheel, substitute with Volume Up.
• After pressing five buttons, the LED will turn off, then blink a number of times corresponding to the detected vehicle type.

Video and RSE Harness

Note: These two additional harnesses are for use in GMLAN29 systems only.

Backup Camera Harness:

• Connect the Yellow RCA to the aftermarket radio's backup camera video input.

RSE Harness:

• Connect the "From rear AV input" RCA's to the aftermarket radio's audio/video input. Plug Yellow into video in, Red to right audio in, and White to left audio in.
• Connect the "To overhead screen" RCA's to the aftermarket radio's audio/video output. Plug Yellow into video out, Red to right audio out, and White to left audio out.
• Connect the Black wire with the ring terminal to ground.

Controlling Satellite

If your vehicle has a Driver Information Center (DIC), satellite information will be displayed. (If OE satellite is equipped)

• Press and hold the Source button for 3 seconds to enter the Satellite menu.
• Navigate through the menu using your SWC buttons:
• Seek Up/Down: Scrolls through menu options.
• Volume Up: Enter.
• Volume Down: Escape.

Menu Options:

• Show Text: Exits menu.
• Set Tuning Mode: Allows user to select tuning by Preset or channel.
• Set Preset: Allows user to program presets.
• Set Display: Allows user to choose what satellite information is displayed (Seek Up controls the top line, Seek Down controls the bottom line).
• Set XM text mode: Allows user to set the display length of XM information (Options: On, Off, 5 seconds - default 5 seconds).

GMLAN11 Instructions

Installing The Interface

• From The 20 Pin Harness:
• Connect the Red wire to the ignition/accessory wire of the aftermarket radio.
• Connect the Orange/White wire to the illumination wire of the aftermarket radio. If the aftermarket radio has no illumination wire, tape off the Orange/White wire.
• Connect the Blue/White wire to the amp turn-on wire of the aftermarket radio.
• Connect the Brown wire to the mute wire of the aftermarket radio. If the aftermarket radio does not have a mute wire, tape up the Brown wire.
• The Black/Yellow wire will be discussed later in the instructions.

For Non-Amplified Systems:

• Connect the White wire to the left front positive speaker output of the aftermarket radio.
• Connect the White/Black wire to the left front negative speaker output of the aftermarket radio.
• Connect the Gray wire to the right front positive speaker output of the aftermarket radio.
• Connect the Gray/Black wire to the right front negative speaker output of the aftermarket radio.

For Amplified Systems:

• Connect the White RCA to the left front low-level output of the aftermarket radio.
• Connect the Gray RCA to the right front low-level output of the aftermarket radio.
• Connect the Green RCA to the left rear low-level output of the aftermarket radio.
• Connect the Violet RCA to the right rear low-level output of the aftermarket radio.

Wires For The Aftermarket Radios That Have Navigation Built In:

• Connect the Green wire to the parking brake wire of the aftermarket navigation radio.
• Connect the Blue/Pink wire to the VSS or speed sense wire of the aftermarket navigation radio.
• Connect the Green/Purple wire to the reverse wire of the aftermarket navigation radio.

From The 22 Way Harness:

• Connect the Black wire with the ring terminal to the back of the aftermarket radio's chassis.
• Connect the 3.5mm jack to your aftermarket radio's steering wheel control input (if equipped).
• Note: If using an Eclipse or Kenwood radio, use the supplied female 3.5 adapter.
• For Kenwood radios: Connect the Kenwood SWC wire (normally Blue/Yellow) to the Brown wire of the GMOS-100. Isolate and tape the Brown/White wire.
• For Eclipse radios: Connect the Eclipse SWC wires (Normally Brown and Brown/Black) to the Brown and Brown/White wires of the GMOS-100. Brown connects to Brown, and Brown/White connects to Brown/Black.

From The 30 Way Harness:

• Connect the Black wire to the ground wire of the aftermarket radio.
• Connect the RCA's on the 8-pin harness to the AUX input on the aftermarket radio (if equipped). The XIA-LCD is needed to view satellite stations (sold separately).
• Connect the Yellow wire to the constant wire of the aftermarket radio.

GMLAN11-100 Setup for Amplified Systems:

• If the vehicle is not amplified, disconnect the 4-pin harness located between the 30-way and 22-way connectors.
• Connect the supplied 4-pin speaker harness and connect the following:
• Connect the Violet wire to the right rear positive wire of the aftermarket radio.
• Connect the Violet/Black wire to the right rear negative wire of the aftermarket radio.
• Connect the Green wire to the left rear positive wire of the aftermarket radio.
• Connect the Green/Black wire to the left rear negative wire of the aftermarket radio.

Installing The GMLAN11-100:

• With all connections completed, plug the 20, 22, and 8-pin harnesses into the GMOS-100.
• Reconnect the negative battery terminal.
• Plug the 30-pin GM harness into the vehicle side harness, and plug the aftermarket radio harness into the aftermarket radio.
• Cycle the key by turning the ignition on, then back off, then back on again to test the radio.

Programming SWC:

• Turn on the ignition.
• Turn on the radio.
• The LED on the GMOS-100 will begin to blink rapidly.
• The following buttons must be pressed in the following order: Volume Up, Seek Up, Band, PTT/Mute, Fan Up. (Each button press will be acknowledged with the LED on steadily).
• If any of the above buttons are not present, substitute with Volume Up.
• After you have pressed five buttons, the LED will turn off, then blink a number of times according to the detected vehicle type.

CLASS II Instructions

Installing The Interface

• From The 20 Pin Harness:
• Connect the Red wire to the ignition/accessory wire of the aftermarket radio.
• Connect the Orange/White wire to the illumination wire of the aftermarket radio. If the aftermarket radio has no illumination wire, tape off the Orange/White wire.
• Connect the Blue/White wire to the amp turn-on wire of the aftermarket radio.
• Connect the Brown wire to the mute wire of the aftermarket radio. If the aftermarket radio does not have a mute wire, tape up the Brown wire.
• The Black/Yellow wire will be discussed later on in the instructions.

For Non-Amplified Systems:

• Connect the White wire to the left front positive speaker output of the aftermarket radio.
• Connect the White/Black wire to the left front negative speaker output of the aftermarket radio.
• Connect the Gray wire to the right front positive speaker output of the aftermarket radio.
• Connect the Gray/Black wire to the right front negative speaker output of the aftermarket radio.

For Amplified Systems:

• Connect the White RCA to the left front low-level output of the aftermarket radio.
• Connect the Gray RCA to the right front low-level output of the aftermarket radio.
• Connect the Green RCA to the left rear low-level output of the aftermarket radio.
• Connect the Violet RCA to the right rear low-level output of the aftermarket radio.

The Following Wires Are For The Aftermarket Radios That Have Navigation Built In:

• Connect the Green wire to the parking brake wire of the aftermarket navigation radio.
• Connect the Blue/Pink wire to the VSS or speed sense wire of the aftermarket navigation radio.
• Connect the Green/Purple wire to the reverse wire of the aftermarket navigation radio.

From The 22 Way Harness:

• Connect the Black wire with the ring terminal to the back of the aftermarket radio's chassis.
• Connect the 3.5mm jack to your aftermarket radio's steering wheel control input (if equipped).
• Note: If using an Eclipse or Kenwood radio, use the supplied female 3.5 adapter.
• For Kenwood radios: Connect the Kenwood SWC wire (normally Blue/Yellow) to the Brown wire of the female 3.5 jack. Isolate and tape the Brown/White wire.
• For Eclipse radios: Connect the Eclipse SWC wires (Normally Brown and Brown/Black) to the Brown and Brown/White wires of the female 3.5 jack. Brown connects to Brown, and Brown/White connects to Brown/Black.

From The 24 Way Harness:

• Connect the Black wire to the ground wire of the aftermarket radio.
• Connect the Yellow wire to the constant wire of the aftermarket radio.
• Connect the White/Blue wire to the aftermarket radio's amp turn-on (if White/Blue wire is populated on the factory side).
• Connect the RCA's on the 8-pin harness to the AUX input on the aftermarket radio (if equipped). The XIA-LCD is needed to view satellite stations (sold separately).

From the 12 way harness:

• Connect the Blue/Pink wire to the aftermarket radio's VSS (if populated on factory side).

CLASS II-100 Setup for Amplified Systems:

• If the vehicle is not amplified, disconnect the 4-pin harness located between the 24-way and 22-way connectors.
• Connect the supplied 4-pin speaker harness and connect the following:
• Connect the Violet wire to the right rear positive wire of the aftermarket radio.
• Connect the Violet/Black wire to the right rear negative wire of the aftermarket radio.
• Connect the Green wire to the left rear positive wire of the aftermarket radio.
• Connect the Green/Black wire to the left rear negative wire of the aftermarket radio.

Installing The CLASS II-100:

• With all the connections completed, plug the 20, 22, and 8-pin harnesses into the GMOS-100.
• Reconnect the negative battery terminal.
• Plug the 24 and 12-pin GM harness into the vehicle side harness, and plug the aftermarket radio harness into the aftermarket radio.
• Cycle the key by turning the ignition on, then back off, then back on again to test the radio.

PROGRAMMING SWC:

In Class II vehicles, there are two ways to program the SWC. If your vehicle is not on the following list, please refer to the “ALL OTHER VEHICLE” section.

• Buick: 2004-07 Rainer
• Cadillac: 2003-06 Escalade (all models)
• Chevrolet: 2003-06 Avalanche, 2000-05 Cavalier, 2004-09 Colorado, 2007 Silverado (classic), 2003-06 Silverado, 2003-06 SSR, 2003-06 Suburban, 2003-06 Tahoe, 2002-09 Trailblazer
• GMC: 2004-09 Canyon, 2002-09 Envoy
• Hummer: 2003-07 H2
• Isuzu: 2003-05 Ascender
• Oldsmobile: 2002-04 Bravada
• Pontiac: 2000-05 Sunfire
• Saab: 2005-07 9-7x
• Saturn: Relay 2005-09
• For ALL OTHER VEHICLES:
• Turn on the ignition.
• The LED will begin to blink rapidly.
• The following buttons must be pressed in the following order: Volume Up, Seek Up, Band, PTT/Mute, Fan Up. (Each button press will be acknowledged with the LED on steadily).

Testing the GMOS-100

• Turn the ignition on, and then turn the aftermarket radio on.
• Push the Onstar button; the radio should turn off (radio will mute if mute wire is connected) and you should hear Onstar. Push the Onstar cancel button and the radio should come back on.

Chime/Turn Signal Volume Adjustment

To adjust the chime volume, use a small screwdriver to rotate the potentiometer located on the 8-pin harness side of the interface (closest to the 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 the 8-pin harness). Turn clockwise to make the 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.

To Manually Set The Radio Type

This action must begin 20 seconds AFTER the Key is set to ACC ON position.

• Hold Down VOLUME DOWN button for 30 seconds.
• LED will begin to blink rapidly.
• Press the VOLUME UP button the number associated with the desired radio type (as seen in the radio list below). The LED will remain ON while holding down the button & will go back to blinking when released.
• For example: If the radio is a JVC, press the VOLUME UP button 5 times.

Radio List:

• RADIO ECLIPSE - 1
• RADIO KENWOOD - 2
• RADIO CLARION - 3
• RADIO SONY DUAL - 4
• RADIO JVC - 5
• RADIO_JENSEN_PIONEER - 6
• RADIO ALPINE - 7
• RADIO VISTEON - 8
• RADIO VALOR - 9
• RADIO_CLARION_5K - 10

• Press the VOLUME DOWN button to finish. The LED will then go off.
• After a few seconds, the LED will then blink the number of times corresponding to the radio ID type. This number should be the same number the user has just pressed the VOLUME UP button.

Remapping the SWC Buttons

If you have the GMOS-100 programmed to your vehicle and your radio and you want to change the button assignment for the steering wheel controls, follow these steps:

• The GMOS-100 must have detected the vehicle and radio it is attached to before you can remap any buttons.
• You can only start the remapping of the steering wheel controls process within the first 20 seconds of turning the ignition key on. If you wait longer than the 20 seconds, you will have to turn the ignition off then back on again.
• Within the first 20 seconds, if any button other than Volume Up or Volume Down is pushed, the remapping process will stop.
• If during the remapping process no button is pushed for 30 seconds, the remapping process is aborted and the original settings are reset.

Let's Begin The Remapping Process:

• Ideally, having the GMOS-100 visible is recommended since you can see the LED flashes to confirm button recognition.
• Turning off the radio is recommended.
• Within the first 20 seconds of turning the ignition on, press and hold down the Volume Up button for at least 25 seconds. The LED will light up solid red. Release Volume Up and the LED will go out. Volume Up has now been programmed.
• Follow the list below in order, however, push the steering wheel control button you want for the function below. If you want to skip a command, press the Volume Up on the steering wheel; this will tell the GMOS-100 to skip the command and go to the next one.

Steering Wheel Control Functions:

1. Volume Up
2. Volume Down
3. Seek Up/Next
4. Seek Down/Prev
5. Source/Mode
6. Mute
7. Preset Up
8. Preset Down
9. Power
10. Band
11. Play/Enter
12. PTT (Push To Talk)
13. On Hook
14. Off Hook
15. Fan Up
16. Fan Down
17. Temp Up
18. Temp Down

Note: Remember not all radios will have all these commands. Please refer to the radio's owner's manual for specific commands recognized by the radio.

For instance, the next command to be mapped is the Volume Down command. Let's say you want the Mode button on your steering wheel to be the Volume Down command. Hold down the Mode button until the LED lights up solid red, and then release it. Now your Mode button on the steering wheel is Volume Down.

After the last button is programmed on your steering wheel (you do not have to go through the whole list), hold down the Volume Up button for at least 10 seconds, then the LED will go out.

Or, after the 18th button is programmed or skipped, the LED will go out, and the remapping is completed.

Resetting or Forcing Auto Learn on the SWC

If for any reason after remapping the steering wheel controls you want to go back to the original steering wheel control settings, follow these steps:

• After 30 seconds of turning the ignition on, press and hold down the original Volume Up button for at least 25 seconds.
• The LED will blink rapidly.
• Release the Volume Up button and wait until the LED goes on solid.
• After the LED goes off, the original steering wheel control settings will be restored.

The XIA-LCD Screen (Optional)

The XIA-LCD will allow you to navigate through factory-installed satellite options.

XIA-LCD Screen Layout:

• 1. Channel Up: Allows channel up function in satellite mode.
• 2. Channel Down: Allows channel down function in satellite mode.
• 3. Select/Enter button: Selects current item on screen.
• 4. Escape/Exit button: Exits to previous screen.
• 5. Screen: This is where your satellite information is viewed.

Notes

This section is provided for user notes.