Installation instructions

99-2022
11
Interface Installation
2. From the 44-way harness:
• Connect the Yellow wire to the 12-volt constant/battery wire of the aftermarket radio
• Connect the Black wire to the ground wire of the aftermarket radio
• Connect the RCA’s to the AUX input of your aftermarket radio.
3. From the 18-way harness:
• Connect the Black wire with the ring terminal to the radio chassis.
(This wire must be grounded here by itself for the interface to work properly)
• The Black/Yellow wire and additional 12-pin harness will be discussed
later in this manual
• Connect the RCA’s to the AUX input of your aftermarket radio (if equipped)
Chime Volume Adjustment
To adjust the chime volume, use a small screwdriver to rotate the potentiometer, located
on the 16-pin harness side of the interface, clockwise to make the chime louder and
counterclockwise to make the chime softer.
Onstar Level Adjustment
To adjust the Onstar volume level find the Black/Yellow wire on the 22-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 to
adjust the Onstar level.
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