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

Dimmer Controls, IPC, Switches, and Serial Data


Object Number: 1892834  Size: FS
Master Electrical Component List
Interior Lighting Systems Description and Operation
Control Module References
Serial Data Continued, HVAC Control Module, Radio, and Switches
Figure 2:

Serial Data Continued, HVAC Control Module, Radio, and Switches


Object Number: 1892835  Size: FS
Master Electrical Component List
Interior Lighting Systems Description and Operation
Control Module References
Dimmer Controls, IPC, Switches, and Serial Data