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

Power, Ground, Serial Data, and Transfer Case Encoder Motor


Object Number: 1748183  Size: FS
Master Electrical Component List
Control Module References
Speed Signal, Front Axle Actuator and Indicators
B+ Bus - Underhood Fuse Block
SP205
G102
G104, G105, and G107
Figure 2:

Speed Signal, Front Axle Actuator and Indicators


Object Number: 1748184  Size: FS
Master Electrical Component List
Control Module References
Power, Ground, Serial Data, and Transfer Case Encoder Motor
Transfer Case Control Schematic Icons
Courtesy Lamp Supply
Ignition Switch - ACCY/RUN/START, RUN, and START Bus Bars, IGN A and CRNK Fuses
4WD, AIRBAG, ECMI, HVAC, and TRANS Fuses
G104, G105, and G107