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Circuit/System Testing

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

Fog Lamp Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the fog lamp switch.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool front fog lamp switch parameter is INACTIVE.
    • If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal C and the ground circuit terminal A. Verify the scan tool front fog lamp switch parameter is ACTIVE.
    • If not the specified value, test the signal circuit terminal C for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the fog lamp switch.

Front Fog Lamps Malfunction

  1. Ignition OFF, disconnect the fog lamp relay.
  2. Test for less than 1 ohm of resistance between the relay coil ground circuit and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the fog lamp relay control circuit and the relay coil ground circuit.
  4. Command the fog lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
  5. Verify that a test lamp illuminates between the relay switch B+ circuit and ground.
    • If the test lamp does not illuminate, test the relay switch B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay coil B+ circuit fuse is open, test the relay controlled output circuit for a short to ground.
  6. Disconnect the harness connector at the Inoperative fog lamp.
  7. Test for less than 1 ohm of resistance between the inoperative fog lamp ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  8. Connect the harness connector at the inoperative fog lamp.
  9. Connect a 15A fused jumper wire between the relay switch B+ circuit and the relay controlled output circuit. Verify the fog lamps are activated.
    • If the fog lamps do not activate, test the relay controlled output circuit for an open/high resistance. If the circuit tests normal, test or replace the inoperative fog lamp.
  10. If all circuits test normal, test or replace the fog lamp relay.

Fog Lamp Indicator Malfunction

  1. Ignition OFF, disconnect the harness connector at the fog lamp switch.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the fog lamp relay control circuit terminal B and ground.
  4. Command the fog lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit terminal B for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit terminal B for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the fog lamp switch.
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