Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS , CONNECTOR REPAIRS , TESTING FOR ELECTRICAL INTERMITTENTS and to WIRING REPAIRS .
If the customer's concern is that the ABS indicator is on only during humid conditions such as rain, snow or vehicle wash, thoroughly inspect the wheel speed sensor circuits for signs of water intrusion. Use the following procedure in order to help isolate the problem area:
- Spray the suspected area with a 5 percent salt water solution.
- Operate the vehicle at a speed greater than 13 km/h (8 mph) for at least 30 seconds.
Repair or replace the suspect harness if the DTC sets.