GM Service Manual Online
For 1990-2009 cars only
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Figure 1:

Power, Ground, Serial Data, Antenna, and User Inputs
Object Number: 1893147 Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
Audio Output
Figure 2:

Audio Output
Object Number: 1893148 Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
Power, Ground, Serial Data, Antenna, and User Inputs