Axxess GMOS-05 User manual

GM ONSTAR CLASS II DATA BUS INTERFACE
GMOS-05
Installation Instructions
1-800-221-0932
©COPYRIGHT 2004-2008 METRA ELECTRONICS CORPORATION Rev.08-19-08
www.axxessinterface.com
The GMOS-05 is designed to be used in vehicles listed below to retain
Onstar and the warning chimes that are lost when the OEM radio is
removed, and also provide a 12 volt accessory output for proper after-
market radio operation. THE GMOS-05 NOW PROVIDES MUTE, PARK-
ING BRAKE, VSS OR SPEED SENSE, AND A REVERSE OUTPUT TO MAKE
INSTALLING AN AFTERMARKET NAVIGATIONAL RADIO SIMPLER AND
LESS TIME CONSUMING.
*READ IMPORTANT WARNING ON PAGE 1
BEFORE ATTEMPTING ANY INSTALLATION
*NOTE: This inteface will also work in vehicles listed
below that are NOT equipped with Onstar.
*NOTE: This inteface will NOT work to retain factory amplifiers.
BUICK
LeSabre 2000-05
OLDSMOBILE
Aurora 2001-03
PONTIAC
Bonneville 2000-05
APPLICATIONS
INTERFACE COMPONENTS
•GMOS-05 Data Interface
•14 pin harness with stripped leads
•12 pin harness to 32 pin GM
harness with stripped leads

GMOS-05
1
*READ IMPORTANT WARNING
BEFORE ATTEMPTING ANY INSTALLATION
*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 CONSULTATECHNICIAN 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 SAFE-
TY SYSTEMS COULD CAUSE HARM TO PERSONS AS WELL.
IF YOU HAVE ANY QUESTIONS IN THIS REGARD PLEASE CALL THE HELP LINE OR THE METRA
AT: 1-800-221-0932 FOR ASSISTANCE.
K NOWLEDGE IS P OWER
Enhanceyour installation and fabrication skillsby
enrolling in the most recognizedandrespected
mobile electronics school in our industry.
Log onto www.installerinstitute.comor call
800-354-6782 for more informationandtake steps
toward abetter tomorrow.

GMOS-05
2
TOOLS REQUIRED FOR INSTALLATION
WIRING UP THE GMOS-05
*Important: Before beginning anyof the following, disconnect the negative batteryterminal to prevent
accidental short circuit.
**Note: The ignition power source of most factoryGM radios keep the radio on until one of the doors is
opened. This is called the R.A.P. (retained accessorypower). The GMOS-05 is designed to retain
this feature.
FOR AFTERMARKET RADIO ONLY:
CONNECTIONS TO BE MADE ON THE 14 PIN HARNESS:
1. Connect the red wire to the ignition/accessory wire of the aftermarket radio.
2. 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 wire.
3. Connect the blue/white wire to the amp turn on wire of the aftermarket radio and to the blue/white wire
in the 32 pin harness.
4. Connect the white wire to the left front positive speaker output of the aftermarket radio.
5. Connect the white/black wire to the left front negative speaker output of the aftermarket radio.
6. Connect the gray wire to the right front positive speaker output of the aftermarket radio.
7. Connect the gray/black wire to the right front negative speaker output of the aftermarket radio.
8. Connect the brown wire to the mute wire of the aftermarket radio. If the after market radio does not have
a Mute wire, tape up the brown wire.
The following wires on the 14 pin harness are for the aftermarket radios that have navigation built in:
1. Connect the green wire to the parking brake wire of the aftermarket navigation radio.
•Cutting Tool • Tape • Crimping Tool
•Connectors (ie: butt-connectors, bell caps, etc.)
3. Connect the green/purple wire to the reverse wire of the aftermarket navigation radio.
When completed, plug the 14 pin harness into the GMOS-05.
(See wiring diagram on page 6)
CONNECTIONS TO BE MADE ON THE 32 PIN GM HARNESS:
1. Connect the yellow wire to the radio’s 12 volt battery or memory wire.
2. Connect the blue wire to the radio’s antenna turn on wire.
3. Connect the Orange wire to the illumination wire of the aftermarket radio. If the aftermarket radio has no
illumination wire just tape off the orange wire.

GMOS-05
3
4. Connect the black wire to the radio’s ground wire.
5. Connect the green wire to the radio’s left rear positive speaker output.
6. Connect the green/black wire to the radio’s left rear negative speaker output.
7. Connect the purple wire to the radio’s right rear positive speaker output.
8. Connect the purple/black wire to the radio’s right rear negative speaker output.
9. Tape up the Blue/White wires as they are not used.
CONNECTIONS TO BE MADE ON THE 14 PIN HARNESS:
1. Connect the red wire to the ignition/accessory wire of the aftermarket radio.
2. Connect the Orange wire to the illumination wire of the aftermarket radio. If the aftermarket radio
has no illumination wire just tape off the orange wire.
3. Connect the blue/white wire to the amp turn on wire of the aftermarket radio
and to the blue/white wire in the 32 pin harness.
4. White NOT USED
5. White/black NOT USED
6. Gray NOT USED
7. Gray/black NOT USED
8. Connect the Brown wire to the mute wire of the aftermarket radio. If the after market radio does not have a
Mute wire, tape up the Brown wire.
The following wires on the 14 pin harness are for the aftermarket radios that have navigation built in:
1. Connect the Green wire to the parking brake wire of the aftermarket navigation radio.
2. Connect the Blue/Pink wire to the VSS or speed sense wire of the aftermarket navigation radio.
3. Connect the Green/Purple wire to the reverse wire of the aftermarket navigation radio.
When completed, plug the 14 pin harness into the GMOS-05.
CONNECTIONS TO BE MADE ON THE 32 PIN GM HARNESS:
1. Connect the yellow wire to the radio’s12 volt battery or memory wire.
2. Connect the black wire to the radio’s ground wire.
3. Connect the blue wire to the amp turn on wire of the aftermarket radio and to the blue wire of the 14 pin
harness.
4. Connect the green wire to the amplifier’s left rear positive speaker output.
FOR AFTERMARKET RADIO AND AMPLIFIER
(See wiring diagram on page 6)

GMOS-05
5. Connect the the green/black wire to the amplifier’s left rear negative speaker output.
6. Connect the purple wire to the amplifier’s right rear positive speaker output.
7. Connect the purple/black wire to the amplifier’s right rear negative speaker output.
8. The Orange and Orange/White wires are not used. Please tape up wires to avoid a short circuit output.
9. Cut the white wire about half way between the two plugs. Connect the white wire from the 32 pin plug to
amplifier’s left front positive speaker output wire. Connect the white wire from the 12 pin plug to the positive
speaker wire of the Metra SP-2003 or equivalent.
10. Cut the white/black wire about half way between the two plugs. Connect the white/black wire from the 32
pin plug to amplifier’s left front negative speaker output wire. Connect the white/black wire from the 12 pin
plug to the negative speaker wire of the Metra SP-2003 or equivalent.
11. Cut the gray wire about half way between the two plugs. Connect the gray wire from the 32 pin plug to ampli-
fier’s right front positive speaker output wire. Connect the gray wire from the 12 pin plug to the positive
speakerwire of the Metra SP-2003 or equivalent.
12. Cut the gray/black wire about half way between the two plugs. Connect the gray/black wire from the 32 pin
plug to amplifier’s right front negative speaker output wire. Connect the gray/black wire from the 12 pin plug
to the negative speaker wire of the Metra SP-2003 or equivalent.
Note: If only one SP-2003 is used tape up the gray wires that would normally connect to the second
SP-2003 to avoid a short circuit.
4

GMOS-05
5
INSTALLING THE GMOS-05
1. With all connections completed to the aftermarket radio, plug the GM32 and GM12 pin harnesses into the
vehicles wiring harnesses.
2. Reconnect the negative battery terminal.
3. Cycle the key by turning the ignition on then back off, then on again to test the radio.
TESTING THE GMOS-05
1. Turn the ignition on if not already, and then turn the radio on to verify that the radio works. Check the balance
and fader control of the radio for proper operation.
2. Push the Onstar button (if so equipped) to verify Onstar is working properly. The radio will shut off or mute,
depending if the brown wire on the 14 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 the side of the GMOS-05.
ONSTAR LEVEL ADJUSTMENT
To adjust the Onstar volume level find the brown wire on the 12 pin harness. Press the blue Onstar button, while
the voice is talking tap the Brown wire to ground. Each time the Brown wire sees ground the volume level will
change. There are 3 volume settings, low, medium, and high. The volume setting will be set until the Brown wire
is tapped to ground again.

6
GMOS-05
BLK
RADIO
YEL
AFTERMARKET RADIO AND AMPLIFIER WIRING
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
14 PIN
12 PIN
BLUE/WHITE
RR-
RR+
LR-
LLR+
GM 32 PIN
TO AFTERMARKET
REAR AMPLIFIER
TO AFTERMARKET
FRONT AMPLIFIER
BROWN
RF
RF LF LF
- +
-
+
X X X
X

GMOS-05 INSTRUCTIONS
1-800-221-0932
REV. 08/19/08 © COPYRIGHT 2004-2008 METRA ELECTRONICS CORPORATION INSTGMOS-05
www.axxessinterface.com
FINAL WIRING CONNECTIONS
Make wiring connections using the EIA color code chart shown below and the
instructions included with the head unit. Metra recommends making connec-
tions as shown below; Strip, Splice, Solder, Tape. Isolate and individually tape
off ends of any unused wires to prevent electrical short circuit.
METRA/EIA WIRING CODE
12V Ignition / Acc. . . . . . . . . . Red
12V Batt / Memory. . . . . . . . . Yellow
Ground. . . . . . . . . . . . . . . . . . Black*
Power Antenna. . . . . . . . . . . . Blue
Amp Turn-On . . . . . . . . . . . . . Blue / White
Amp Ground. . . . . . . . . . . . . . Black / White
Illumination . . . . . . . . . . . . . . Orange
Dimmer . . . . . . . . . . . . . . . . . Orange / White
Right Front (+) . . . . . . . . . . . . Gray
Right Front (-). . . . . . . . . . . . . Gray / Black
Left Front (+) . . . . . . . . . . . . . White
Left Front (-). . . . . . . . . . . . . . White / Black
Right Rear (+) . . . . . . . . . . . . Violet
Right Rear (-) . . . . . . . . . . . . . Violet / Black
Left Rear (+) . . . . . . . . . . . . . Green
Left Rear (-) . . . . . . . . . . . . . . Green / Black
STRIP
SPLICE
SOLDER
TAPE