Axxess GMOS-04 Instrucciones De Instalación página 5

Installing the GMOS-04
• With all connections completed to the aftermarket radio, plug the 24- and
12-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.
Testing the GMOS-04
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
Note: If Y91 is present on the RPO list, refer to your
owner's manual to adjust chimes.
1) With car on, shut off car and leave keys in
ignition. Open the car door and leave it open.
Chimes will be heard.
GMOS-04
Potentiometer located on 16-pin
side of the interface
Testing the GMOS-04
2) Wait 10 seconds, then with a small screwdriver adjust the potentiometer fully
counterclockwise (all the way left), then clockwise to raise chime level and
counterclockwise to lower the chime level.
3) When the volume is at the desired level, remove the keys from the ignition. This
will lock the chime volume at its current level.
Audio Level Adjustment
1) Start your vehicle and turn on the radio having audio playing.
2) Turn your aftermarket radio's volume up ¾ of the way.
3) With a small screwdriver adjust the potentiometer clockwise to raise the audio
level and counterclockwise to lower the audio level.
4) Once at desired level your audio adjustment is complete.
OnStar Level Adjustment
To adjust the OnStar "volume up" or "volume down" on the steering wheel. If
steering wheel controls are not present 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 the ground. Once volume is set it will stay at the volume until the
Black/Yellow wire is tapped to ground again. This can be set during installation
and then left alone.
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