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

Power and Ground


Object Number: 1907197  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Shift Control and Indicators
RUN/CRANK Bus - AIRBAG IGN, MISC IGN and SEO/ALC Fuses
AMP, ELEC RUN BOARD, ESC/ALC EXH, EXP/BRK MDL, and TREC Fuses
Encoder Motor and Serial Data
Serial Data Communication Enable and Wake-up Circuits
G102, G104, and G108
Figure 2:

Shift Control and Indicators


Object Number: 1907199  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Encoder Motor and Serial Data
Power and Ground
Ignition 1 Voltage
Ignition 1 Voltage
Ignition 1 Voltage
Figure 3:

Encoder Motor and Serial Data


Object Number: 1907201  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Front Drive Axle Actuator and Speed Sensors
Shift Control and Indicators
Data Communication Schematics
HIgh Speed Bus - 2 of 2
Power and Ground
Figure 4:

Front Drive Axle Actuator and Speed Sensors


Object Number: 1907203  Size: FS
Master Electrical Component List
Transfer Case Description and Operation
Control Module References
Encoder Motor and Serial Data
RUN/CRANK Bus - ECM-IGN and TRANS IGN 1 Fuses
G102, G104, and G108