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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 997 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> Washer Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Windshield Washer Switch parameter while pressing and releasing the washer switch. The reading should change between Active and Inactive.
    • If the reading does not change between the specified values, refer to the Windshield Washer Switch Circuit Test below.
  2. Connect a test lamp between the relay side of the FRT WASH fuse and ground.
  3. Ignition ON, verify that the test lamp turns ON and OFF while pressing and releasing the windshield washer switch.
    • If the test lamp does not turn ON and OFF while changing between the commanded states, refer to the Windshield Washer Pump Relay Control Circuit Test below.
  4. If the washer pump does not operate, refer to the Windshield Washer Pump Circuit Test below.
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