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

Power, Ground, Illumination, and Serial Data


Object Number: 1898269  Size: FS
Master Electrical Component List
Instrument Cluster Description and Operation
Control Module References
Indicators
Figure 2:

Indicators


Object Number: 1898270  Size: FS
Master Electrical Component List
Indicator/Warning Message Description and Operation
Control Module References
Power, Ground, Illumination, and Serial Data