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

Power, Ground, Serial Data, and Antennas


Object Number: 1803189  Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
Power, Ground, Serial Data, Antennas, and Voice Recorder
Fuse Block - Underhood BATT MAIN 1 Fuse
Fuse Block - Underhood BATT MAIN 1 Fuse
Data Link Connector Schematics L26
Data Link Connector (DLC) Schematics LY7
Entertainment/Communication Schematic Icons
G202
Figure 2:

VCIM to Inside Rearview Mirror


Object Number: 1803191  Size: FS
Master Electrical Component List
OnStar Description and Operation
Control Module References
VCIM to Inside Rearview Mirrors
Entertainment/Communication Schematic Icons
Entertainment/Communication Schematic Icons
Entertainment/Communication Schematic Icons
G302