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

Antennas, Data Link, Ground, and Power


Object Number: 1551833  Size: FS
Master Electrical Component List
OnStar Description and Operation
Audio Communication and Inside Rearview Mirror
B/U LP, DIC/RKE, PWR DROP and RT HTD ST Fuses, PWR SEATS BRKR Circuit Breaker
DLC
G202
Figure 2:

Audio Communication and Inside Rearview Mirror


Object Number: 909211  Size: FS
Master Electrical Component List
OnStar Description and Operation
Antennas, Data Link, and Power
Roof Lighting
Heat Controls (Monte Carlo)
G302 - 1 of 2
Cellular Communication Schematic Icons
Cellular Communication Schematic Icons