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Symptom: *OVERHEAD, REAR AND LIFTGATE LAMPS INOPERATIVE POSSIBLE CAUSES BULBS OPEN FUSED B(+) COURTESY LAMP DRIVER CIRCUIT OPEN BCM COURTESY LAMP DRIVER TEST ACTION APPLICABILITY 1 Remove and check inoperative bulbs. All Yes → No → Replace the bulbs. 2 Measure the voltage of the Fused B(+) circuit to the Lamp. All Yes → No → Repair the open Fused B(+) circuit back to splice. 3 Turn ignition off. All Yes → No → Repair the open Courtesy Lamp Driver circuit. 4 Turn the Dome Lamp Switch to the ON position. All Yes → Test Complete. No → Replace the Body Control Module (BCM). 419 INTERIOR LIGHTING |