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

Power, Ground, DLC, and Vehicle Speed


Object Number: 857689  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
Mode Select Inputs
RADIO, RADIO AMP, 4WS
RADIO, RADIO AMP, 4WS
IGN 3
SP205 - 1 of 2
Gauges, VSS, Engine Oil Signals
Figure 2:

Mode Select Inputs


Object Number: 857690  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
Steering Wheel/Speed Position Sensor
Power, Ground, DLC, and Vehicle Speed
LED Dimming Supply Voltage - 1 of 2
Figure 3:

Steering Wheel Speed/Position Inputs


Object Number: 1201188  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
YAW/LAT and Rear Wheel Position Sensors
Mode Select Inputs
BRAKE, HTR/AC, HVAC I, CRUISE, 4WD
BRAKE, HTR/AC, HVAC I, CRUISE, 4WD
G203 - 3 of 3
G203 - 2 Of 2
G203 - 1 Of 2
G203 - 1 Of 2
Passlock Sensor Inputs and Class 2
Interior Lights and LED Dimming Control
Steering Wheel Speed/Position Inputs
Steering Wheel Speed/Position Sensor Inputs
Figure 4:

YAW/LAT and Rear Wheel Position Sensors


Object Number: 857691  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
Steering Gear Motor Assembly
Steering Wheel/Speed Position Sensor
Figure 5:

Steering Gear Motor Assembly


Object Number: 857692  Size: FS
Master Electrical Component List
Rear Wheel Steering Description and Operation
YAW/LAT and Rear Wheel Position Sensors