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

Antennas, Data Link, Ground, and Power


Object Number: 909207  Size: FS
Master Electrical Component List
OnStar Description and Operation
Audio Comm., and Inside Rearview Mirror
B/U LP, DIL/RKE, PWR DROP, and RT HTD ST Fuses
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, Ground, and Power
Inside Rearview Mirror
Roof Lighting
G203 [1 of 2]
Cellular Communication Schematic Icons
Cellular Communication Schematic Icons