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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> Washer Malfunction >> Circuit/System Testing >> Washers Inoperative Starting Point
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Washers Inoperative Starting Point

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Ignition ON, with a test lamp connected to ground, probe each of the test points on the WSW/PUMP Fuse while activating the washer switch. The test lamp should illuminate at one or both of the fuse test points.

Washer Switch Test

  1. Ignition ON, verify that the scan tool Windshield Washer Switch parameter is Active while pressing the washer switch.
    • If not Active, test the following:
      • Perform the multifunction switch component test.
      • Test the windshield washer switch signal circuit for an open/high resistance. If the washer switch and circuit test normal, test or replace the body control module.
  2. Ignition OFF, disconnect the C2 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 body control module.
  4. If all circuits test normal, test or replace the underhood fuse block.

Washer Fluid Pump Test

  1. Ignition OFF, disconnect the harness connector at the windshield washer fluid pump.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground.
    • If greater than 1 ohm, repair the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the washer pump control circuit terminal A and ground while pressing the washer switch.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the underhood fuse block.
  4. If all the circuits test normal, test or replace the windshield washer fluid pump.

Washers Always On

  1. Remove the WSW fuse from the underhood fuse block. The washer pump should turn OFF.
    • If the washer pump does not turn OFF, test the washer pump control circuit for a short to voltage.
  2. Ignition ON, verify the scan tool Windshield Washer Switch parameter is Inactive.
    • If not Inactive, test the following:
      • Perform the multifunction switch component test.
      • Test the windshield washer switch signal circuit for a short to ground. If the washer switch and circuit test normal, test or replace the body control module.
  3. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
  4. Ignition ON, verify that a test lamp does not illuminate between the windshield washer relay control circuit terminal 13 and battery voltage.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, test or replace the body control module.
  5. If all circuits test normal, test or replace the underhood fuse block.
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