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Home >> Chevrolet >> 2007 >> Impala SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 579 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2580 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTC, ignition OFF, headlamp switch OFF, disconnect the high beam headlamp relay.
  2. Verify a test lamp illuminates between the negative battery terminal and the high beam headlamp relay control circuit.
    • If the test lamp does not illuminate, replace the high beam headlamp relay.
  3. Test for a short to voltage in the high beam headlamp relay control circuit.
    • If all circuits/connections test normal, replace the BCM.
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