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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Sky. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the front fog lamp relay.
  2. Test for less than 1.0 ohm of resistance between the fog lamp relay ground circuit and ground at the relay terminal.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the front fog lamp relay control circuit and the ground circuit at the relay terminals.
  4. Command the front 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. If all circuits test normal, test or replace the front fog lamp relay.
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