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

Power, Ground, and Video Signals


Object Number: 1923642  Size: FS
Master Electrical Component List
Video Entertainment System Description and Operation
Control Module References
Audio Signals
Figure 2:

Audio Signals


Object Number: 1923645  Size: FS
Master Electrical Component List
Video Entertainment System Description and Operation
Control Module References
Power, Ground and Video Signals