Axxess GMOS-05 User guide

METRA. THE WORLD’S BEST KITS.™
© COPYRIGHT 2004-2011 METRA ELECTRONICS CORPORATION
1-800-221-0932 metraonline.com
INSTALLATION INSTRUCTIONS FOR PART INSTGMOS-05
REV. 12/21/11
Cutting Tool • Crimping Tool • Tape • Connectors (example: butt-connectors, bell caps, etc.
IGNITION TERMINALS
WIRE CUTTER
M3.5
M2.6
M3
M5
M4
ISO
6
2.5
1.5
TOOLS REQUIRED
GM non-amplified OnStar Class II Data
Bus Interface 2000-2004
GMOS-05
GMOS-05 interface • 16-pin harness with stripped leads
14-pin harness to 32-pin GM harness with stripped leads
INTERFACE COMPONENTS
KIT FEATURES
APPLICATIONS
• Provides accessory (12-volt 10-amp)
• Retains R.A.P. (Retained Accessory Power)
• Used in non-amplified systems or when replacing amplified systems
• Retains chimes
• Provides NAV outputs (Parking Brake, Reverse, Mute, V.S.S.)
• ASWC harness included (ASWC not included)
• Retains OnStar/OE Bluetooth
• Adjustable volume for chimes and OnStar
• High level speaker input
• USB updatable
• Retains balance and fade
See inside front cover

Applications
GMOS-05
Caution
Metra recommends disconnecting the negative battery terminal before beginning any
installation. All accessories, switches, and especially air bag indicator lights must be
plugged in before reconnecting the battery or cycling the ignition.
*NOTE: Refer also to the instructions included with the aftermarket radio.
BUICK
Le Sabre 2000-2004
00-2005
OLDSMOBILE
Aurora 2001-2003
PONTIAC
Bonneville 2000-2004
(Note: This interface will also work in vehicles listed below that are not equipped with OnStar)

From the 16-pin harness:
• Connect the Red wire to the ignition 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 just tape off the Orange/White wire.
• 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
• 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.
• Connect the Light 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.
• Plug the 16 pin harness into the GMOS-05
3
Connections to be made
GMOS-05

4
GMOS-05
From the 32-pin harness:
• Connect the Yellow wire to the radio’s 12 volt battery or memory wire.
• Connect the Black wire to the radio’s ground wire.
• Connect the Blue wire to the antenna turn on wire of the aftermarket radio.
• Connect the Green wire to the radio’s left rear positive speaker output.
• Connect the Green/Black wire to the radio’s left rear negative speaker output.
• Connect the Purple wire to the radio’s right rear positive speaker output.
• Connect the Purple/Black wire to the radio’s right rear negative speaker output.
• Plug the 14-pin harness into the GMOS-05
• The Black/Yellow wire is for the OnStar volume adjustment. This will be discussed in
the OnStar Level Adjustment section of this instruction.
Installing the GMOS-05
• With all connections completed to the aftermarket radio, plug the 32-pin harnesses into
the vehicles wiring harnesses.
• Reconnect the negative battery terminal.
• Cycle the key, by turning the ignition on for 30 seconds. Then off and on again
to test the radio.
Connections to be made

5
GMOS-05
1) Turn the ignition on if not already, and then turn the radio on to verify that the radio
works. Check balance and fader controls for proper operation.
2) Push the OnStar button (if equipped) to verify OnStar is working. The radio will shut off or
mute, depending if the Brown wire on the 16-pin harness is connected, and OnStar will
be heard through the front speakers. Turn off OnStar and the radio will turn back on.
Chime Volume Adjustment
To adjust the chime volume, use a small
screwdriver to rotate the potentiometer
clockwise to make the chime louder and
counterclockwise to make it softer. The
potentiometer is located on 16-pin side
of the GMOS-05.
OnStar Level Adjustment
To adjust the OnStar volume level find the
Black/Yellow wire on the 16-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, the customer may also tap
volume up or down on the steering wheel (if equipped) to adjust the OnStar level.
Testing the GMOS-05

GMOS-05
6
Aftermarket radio and amplifier wiring
BLK
RADIO
YEL
AFTERMARKET RADIO AND AMPLIFIER WIRING
TO ONSTAR 12 PIN GM AUDIO CONNECTOR
GM 12 PIN
SP-2003
SP-2003
OPTIONAL
REQUIRED
GM
OS-05
RF
RF LF LF
- +
- +
CHIME VOLUME ADJUSTMENT
RED
GREEN BLUE/PINK
BLUE/WHITE
GREEN/PURPLE
BROWN
ORANGE/WHITE
16 PIN
14 PIN
BLUE/WHITE
RR-
RR+
LR-
LLR+
GM 24 PIN
TO AFTERMARKET
REAR AMPLIFIER
TO AFTERMARKET
FRONT AMPLIFIER
BROWN
RF RF LF LF
- +
-
+
X X X
X

Notes

METRA. THE WORLD’S BEST KITS.™
© COPYRIGHT 2004-2011 METRA ELECTRONICS CORPORATION
1-800-221-0932 metraonline.com
INSTALLATION INSTRUCTIONS FOR PART INSTGMOS-05
REV. 12/21/11
KNOWLEDGE IS POWER
Enhance your installation and fabrication skills by
enrolling in the most recognized and respected
mobile electronics school in our industry.
Log onto www.installerinstitute.com or call
800-354-6782 for more information and take steps
toward a better tomorrow.
Metra recommends MECP
certified technicians
IMPORTANT WARNING
This product includes instructions for installation which must be carefully
followed. The instructions are worded in such a manner to assume
that the installer is capable of completing these type of electronic
installations. If you are unclear as to what you are instructed to do or
believe that you do not understand the instructions so as to properly and
safely complete the installation you should consult a technician who
does have this knowledge and understanding.
Failure to follow these instructions carefully and to install the
interface as described could cause harm to the vehicle or to safety
systems on the vehicle. Interference with certain safety systems
could cause harm to persons as well. If you have any questions in
this regard please call the Help line or Metra at
1-800-221-0932 for assistance.