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

Power, Ground, Serial Data, and Switches


Object Number: 2062430  Size: FS
Figure 2:

Sensors and Solenoids


Object Number: 2062436  Size: FS
Figure 3:

Tow/Haul Switch and Tap Shift System


Object Number: 2062441  Size: FS