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Test Description

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.

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 6

    This step tests for battery voltage on the signal circuits that are not required.

  2. 7

    This step tests for no battery voltage on the required signal circuits.

  3. 8

    If any ignition switch parameters that should be inactive in the present ignition switch position are active, 2 ignition switch signal circuits may be shorted together.

  4. 9

    This step eliminates open circuits as the cause of the malfunction.

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