Diagnostic Aids
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 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 inspect the wiring harness. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
- 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 Measuring Wheel Alignment (w/Rear Wheel Steering) or Measuring Wheel Alignment (w/o Rear Wheel Steering) .