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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1105 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> Washer Malfunction >> Circuit/System Testing >> Washer Switch Test

Washer Switch Test

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, verify that the scan tool Headlamp Washer Switch parameter is Active while pressing the washer switch.
    • If not Active, test the following:
      • Perform the multifunction switch component test.
      • Test the Headlamp washer switch signal circuit for an open/high resistance. If the headlamp washer switch and circuit test normal, test or replace the BCM.
  2. Ignition OFF, disconnect the X2 harness connector at the underhood fuse block.
  3. Ignition ON, verify that a test lamp illuminates between the windshield washer pump relay control circuit terminal 13 and battery voltage while pressing the washer switch.
    • If the test lamp does not illuminate, test the washer relay control circuit terminal 13 for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the BCM.
  4. If all circuits test normal, test or replace the underhood fuse block.
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