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: 1909115  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Transfer Case Shift Control Switch Inputs
Ignition Switch - OFF/RUN/START, RUN/START, and START Busses
Ignition Switch - OFF/RUN/START, RUN/START, and START Busses
G101 - 1 of 2
Splice Pack SP203
Figure 2:

Transfer Case Shift Control Switch Inputs


Object Number: 1909117  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Power, Ground, Class 2 Serial Data, Transfer Case Shift Control Module and Transfer Case Encoder Motor
G103 - 1 of 2, G105, and G106
IGN-4, ELEC BRK/BRKLP, HDLP, MKR LTS, PWR WNDW, DRL, and RADIO Fuses/Circuit Breakers