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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.
GMOS-05
5
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