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

Power, Ground and Serial Data


Object Number: 1898198  Size: FS
Master Electrical Component List
Transmission Component and System Description
Control Module References
Tap UP/Tap Down Switch
Figure 2:

Tap Up/Tap Down Switch


Object Number: 1898201  Size: FS
Master Electrical Component List
Transmission Component and System Description
Control Module References
Power, Ground and Serial Data