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ONSTAR LEVEL ADJUSTMENT
To adjust the Onstar volume level find the Black/Yellow wire on the 16-pin har-
ness. 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 auto-
matically 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.
AUDIO LEVEL ADJUSTMENT
When using the GMOS-06 with a radio that has a high pre-out voltage the audio
signal may become distorted.
To resolve this follow these steps:
1. Locate the potentiometer next to the 14-pin connector
located on the GMOS-06.
2. Taking a small flat headed screwdriver, turn the potentiometer
counter-clockwise to lower the input level going to the factory amplifier.
Note: The chime volume will also adjust with the audio input.
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