Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Pontiac >> 2006 >> Solstice Automatic >> Repair and Diagnosis >> Body & Frame >> Windows >> Stationary Window System >> Diagnostic Information and Procedures >> Defogger Inoperative - Rear Window >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, install a scan tool and display the Rear Defog Switch Input parameter in the HVAC data list.
  2. Turn the rear window defogger switch ON and OFF while observing the scan tool. The scan tool should display on and off as the defogger switch is cycled.
    • If the scan tool parameter does not change from ON to OFF as the switch is cycled, repair the rear defog switch signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Ignition OFF, disconnect the rear window defog relay.
  4. Ignition ON, turn on the rear window defogger.
  5. Verify that a test lamp illuminates between the rear defog relay control circuit and ground at the rear window defog relay terminals.
    • If the test lamp does not illuminate, repair a short to ground or an open/high resistance in the rear defog relay control circuit. If the circuit tests normal, replace the BCM.
  6. Verify that a test lamp illuminates between the rear defog relay control circuit and the rear defog relay coil side ground circuit at the rear window defog relay terminals.
    • If the test lamp does not illuminate, repair an open/high resistance in the rear defog relay coil side ground circuit.
  7. Verify that a test lamp illuminates between the rear defog relay voltage supply circuit and ground at the rear defog relay terminals.
    • If the test lamp does not illuminate, repair a short to ground or an open/high resistance in the rear defog relay voltage supply circuit.
  8. Disconnect the rear window defogger grid harness connector.
  9. Verify that a test lamp illuminates between battery voltage and the rear window defogger grid ground circuit.
    • If the test lamp does not illuminate, repair an open/high resistance in the rear window defogger grid ground circuit.
  10. Connect the rear window defogger grid harness connector.
  11. Connect a 20 amp fused jumper between the rear defog relay voltage supply circuit and the rear window defogger grid voltage supply circuit at the rear defog relay terminals. Verify the defogger grid is activated.
    • If the rear window defogger grid is not activated, repair a short to ground or an open/high resistance in the rear window defogger grid voltage supply circuit. If the circuit tests normal, test or replace the rear window defogger grid.
  12. If all circuits test normal, test or replace the rear window defog relay.
scientia non olet · About Mike's Workshop Manuals