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

Power, Ground, Serial Data , and Encoder Circuits


Object Number: 1469128  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Transfer Case Control Switch and Module
B+ Bus - 1 of 2
RR WPR, STOP LP, TREC, VEH CHMSL, VEH STOP, and 4WS Fuses
Power, Ground, DLC, and Splice Pack SP205
G101 and G110
Figure 2:

Control Switch and Module


Object Number: 1469130  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Power, Ground, Serial Data, and Encoder Motor
Ignition Switch - ACCY/RUN/START, RUN, and START Busses, IGN A and CRANK Fuses
BRAKE, CRUISE, IGN 2, HTR/AC, HVAC 1, and 4WD Fuses
Dimming Control and LED DImming Supply Voltage - 2 of 2