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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 910 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2555 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the driver or passenger door harness connector C2 as applicable.
  2. Connect a test lamp between the courtesy lamp control circuit terminal 10 at the door harness connector and ground.
    • If the test lamp illuminates, locate and repair a short to voltage in the courtesy lamp control circuit.
    • If the test lamp does not illuminate, locate and repair a short to ground in the courtesy lamp control circuit.
  3. If circuits test OK, replace the driver or passenger door switch as applicable.
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