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Circuit/System Testing: Notes

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Windshield Washer Solvent Heater Malfunction

  1. Ignition OFF, disconnect the C1 harness connector at the windshield washer solvent heater assembly.
  2. Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the battery positive voltage circuit for a short to ground or an open/high resistance.
  3. Verify that a test illuminates between the washer solvent heater assembly ground circuit terminal 2 and battery voltage.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  4. Ignition OFF, disconnect the C2 harness connector at the windshield washer solvent heater assembly.
  5. Engine running, verify that a test lamp illuminates between the ignition 3 voltage circuit terminal 6 and ground.
    • If the test lamp does not illuminate, test the ignition 3 voltage circuit for a short to ground or an open/high resistance.
  6. Verify that a test illuminates between the washer solvent heater assembly ground circuit terminal 4 and battery voltage.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  7. Verify that a test lamp does not illuminate between the washer fluid heated control switch signal circuit terminal 1 and battery voltage.
    • If the test lamp is illuminated, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the heated washer fluid switch.
  8. With a test lamp connected between the washer fluid heated control switch signal circuit terminal 1 and battery voltage, press the heated washer fluid switch and verify that the test lamp illuminates.
    • If the test lamp does not illuminate, test the switch signal and ground circuits for a short to voltage or an open/high resistance. If the circuit test normal, test or replace the heated washer fluid switch.
  9. If all circuits test normal, test or replace the windshield washer solvent heater assembly.

Windshield Heated Washer Fluid Indicator Inoperative

  1. Ignition OFF, disconnect the C2 harness connector at the windshield washer solvent heater assembly.
  2. Ignition ON, install a 3-amp fused jumper wire between the washer fluid heated control switch LED control circuit terminal 2 and ground. Verify the heated washer switch indicator is illuminated.
    • If the indicator is not illuminated, test the control circuit for an open/high resistance. If the circuit tests normal, replace the accessory switch assembly.
  3. If all circuits test normal, replace the windshield washer solvent heater assembly.

Windshield Heated Washer Fluid Indicator Always On

  1. Ignition OFF, disconnect the C2 harness connector at the windshield washer solvent heater assembly.
  2. Ignition ON, the heated washer switch indicator should not be illuminated.
    • If illuminated, test the washer fluid heated control switch LED control circuit for a short to voltage. If the circuit tests normal, replace the accessory switch assembly.
  3. If all circuits test normal, replace the windshield washer solvent heater assembly.
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