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

Power, Ground, Serial Data, and Switches


Object Number: 1873059  Size: FS
Master Electrical Component List
Electronic Component Description
Control Module References
Sensors and Solenoids
Figure 2:

Sensors and Solenoids


Object Number: 1873061  Size: FS
Master Electrical Component List
Electronic Component Description
Control Module References
Tow/Haul Switch and Tap Shift System
Power, Ground, Serial Data, and Switches
Figure 3:

Tow/Haul Switch and Tap Shift System


Object Number: 1873063  Size: FS
Master Electrical Component List
Electronic Component Description
Control Module References
Sensors and Solenoids