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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1952 (Lighting System) >> Diagnostic Information and Procedures >> DTC B2635 >> Circuit/System Testing
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Circuit/System Testing

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  1. Disconnect the harness connector at the appropriate outside rearview mirror courtesy lamp.
  2. Ignition ON, verify a test lamp illuminates between the exterior courtesy lamp signal circuit terminal and ground.
    • If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance.
  3. Connect a test lamp between the control circuit terminal and the signal circuit terminal.
  4. Command the Puddle/Courtesy Lamp 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 ON, test the control circuit for a short to ground. If the circuit tests normal, replace the appropriate door lock/window switch.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate door lock/window switch.
  5. If all circuits test normal, test or replace the inoperative outside rearview mirror courtesy lamp.
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