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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 B2540 >> Circuit/System Testing
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Circuit/System Testing

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  1. Inspect the rear fog lamp bulb for an open or shorted filament.
    • If the bulb is inoperable, replace the bulb.
  2. Park lamp switch OFF, clear the DTC and test the rear fog lamp control circuit for a short to voltage, short to ground, open, or high resistance.
    • If all circuits/connections test normal, replace the XBCM.
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