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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2555 >> Circuit/System Testing
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Circuit/System Testing

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  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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