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

Power, Grounds, Serial Data and Controlled/Monitored Systems
Object Number: 2151236 Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Control Module References
Gauges and Indicators
B+ Bus 1 of 2
Fuse Block - Rear F29, F34, F22, F4, F24, F3, F23, and F1 Fuses
B+ Bus 1 of 2
Fuse Block - Rear F40, F39, F14, F16, F17, F18 and F12 Fuses
Power, Ground , Class 2, and GM Low Speed Serial Data (CAN A)
Tire Pressure Monitoring System Schematics
Door Locks
Module Power, Ground, Serial Data and MIL
Defogger Schematics
Compressor Controls
Stability Off Switch and Yaw and Lateral Accelerometer Sensor
Brake, Hazard, and Turn Signal Switching
Fog Lights Schematics
Interior Lights Dimming Schematics
G203, G204, and G205
Figure 2:

Gauges and Indicators
Object Number: 2151237 Size: FS
Master Electrical Component List
Indicator/Warning Message Description and Operation
Control Module References
Power, Grounds, Serial Data and Controlled/Monitored Systems
Power, Ground , Class 2, and GM Low Speed Serial Data (CAN A)