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

Power, Ground, Serial Data and Vehicle Speed


Object Number: 1241620  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
Mode Selection
B+ Bus Bar - 1 of 2
Ignition Switch - START, RUN, and ACC/RUN/START Bus Bars
IGN 3, Cruise, and 4WD Fuses
4WS, RADIO, and RADIO AMP Fuses
SP205 - 1 of 2
Vehicle Speed and Speedometer
Figure 2:

Mode Selection


Object Number: 1241641  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
Steering Wheel Speed/Position
Power, Ground, Serial Data and Vehicle Speed
LED Dimming Supply Voltage - 1 of 3
Figure 3:

Steering Wheel Speed/Position


Object Number: 1241651  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
Steering Gear Motor Assembly
Mode Selection
IGN 3, Cruise, and 4WD Fuses
IGN 3, Cruise, and 4WD Fuses
G203 - 3 of 3
Vehicle Theft Deterrent
G203 - 2 of 3
G203 - 1 of 3
G203 - 1 of 3
Interior Lights and LED Dimming Control
Figure 4:

Rear Wheel Position Controls


Object Number: 1241670  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
Steering Wheel Speed/Position