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

Power, Ground, Class 2 Serial Data, Transfer Case Shift Control Module and Transfer Case Encoder Motor


Object Number: 1470447  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Batteries and B+ Busses
Figure 2:

Transfer Case Shift Control Switch Inputs


Object Number: 1470448  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Batteries and B+ Busses