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Home >> Saturn >> 2009 >> Vue Red Line, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 573 (Lighting System) >> Diagnostic Information and Procedures >> DTC B2530 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac XLR. 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 ground circuit terminal C3 and ground.
    • 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 terminal A4 and the ground circuit terminal C3.
  4. Command the front fog lamps ON and OFF with the front fog lamp switch. 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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