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

Power, Ground, Serial Data, MIL, and Security


Object Number: 1283390  Size: FS
Master Electrical Component List
Horns System Description and Operation
Gages
B+ Bus - Underhood Fuse Block
Power, Ground, MIL, and DLC
Power, Ground, MIL, and DLC
Vehicle Theft Deterrent
Data Link Connector (DLC) Schematics
G300, G301, and G302
Figure 2:

Gages


Object Number: 1283391  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Indicators
Power, Ground, Serial Data, MIL, and Security
Data Link Connector (DLC) Schematics
5 Volt Reference
5 Volt Reference
Figure 3:

Indicators


Object Number: 1283392  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Gages
Turn Signal Lamps
Data Link Connector (DLC) Schematics