Diagnostic Aids

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for poor connections at the harness connector of the rear wheel steering control module and Lateral/Yaw sensor connector. Refer to TESTING FOR INTERMITTENT and POOR CONNECTIONS and Connector Repairs .
Observe the rear wheel steering mode select switch. If all of the mode indicator LEDs are illuminated the rear wheel steering control module has lost its memory settings and the scan tool must be used to re-calibrate the rear wheel steering alignment data in the rear wheel steering control module. Refer to SPECIFICATIONS .
The system can have a DTC C0186 and 4-Wheel Steering will still function normally.