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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> Windshield Washer Solvent Heater Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Windshield Washer Solvent Heater Malfunction

  1. Ignition OFF, disconnect the C1 harness connector at the windshield washer solvent heater assembly.
  2. Test for less than 5 ohms of resistance between the ground circuit terminal 2 and ground.
    • If greater than 5 ohms, test the ground circuit for an open/high resistance.
  3. 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.
  4. Ignition OFF, disconnect the C2 harness connector at the windshield washer solvent heater assembly.
  5. Test for less than 5 ohms of resistance between the ground circuit terminal 4 and ground.
    • If greater than 5 ohms, test the ground circuit for an open/high resistance.
  6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 6 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  7. Connect a test lamp between the heated washer fluid switch signal circuit terminal 1 and battery voltage.
  8. The test lamp should turn ON and OFF while pressing and releasing the heated washer fluid switch.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the turn signal/mulitfunction switch.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the turn signal/mulitfunction switch.
  9. Ignition ON, verify that a test lamp does not illuminate between the heated washer fluid indicator control circuit terminal 2 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the instrument panel cluster (IPM).
  10. 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 3A fused jumper wire between the heated washer fluid indicator control circuit terminal 2 and ground. Verify the DIC displays the HEATING WASH FLUID WASH WIPES PENDING message.
    • If the message is not displayed, test the control circuit for a short to voltage or open/high resistance. If the circuit tests normal, replace the instrument panel cluster (IPM).
  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 DIC should not display the HEATED WASHER FLUID WASHER SYSTEM OFF message.
    • If displayed, test the heated washer fluid indicator control circuit for a short to ground. If the circuit tests normal, replace the instrument panel cluster.
  3. If all circuits test normal, replace the windshield washer solvent heater assembly.
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