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

Power, Ground, Serial Data, MIL, and Security


Object Number: 1472785  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Body Control Module (BCM) Programming/RPO Configuration
Gages
B+ Bus - Underhood Fuse Block
Module Power, Ground, Serial Data, and MIL
Power, Ground, Serial Data, and MIL
Vehicle Theft Deterrent
Data Link Connector (DLC) Schematics
G300, G301, G302, and G303
Figure 2:

Gages


Object Number: 1472822  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Body Control Module (BCM) Programming/RPO Configuration
Indicators
Power, Ground, Serial Data, MIL, and Security
Data Link Connector (DLC) Schematics
Figure 3:

Indicators


Object Number: 1472823  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Body Control Module (BCM) Programming/RPO Configuration
Gages
Turn Signal Lamps
Data Link Connector (DLC) Schematics