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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (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 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the X50A underhood fuse block.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 19 and ground.
    • If the test lamp is ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
  3. Connect a test lamp between the control circuit terminal 19 and B+.
  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 OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, replace the X50A underhood fuse block.
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