Diagnostic Aids

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Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .

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.

Fig 1: DTC C0035 Or C0040 (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC C0035 Or C0040 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.