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Symptom: *COURTESY LAMP INOPERATIVE-ALL LAMPS POSSIBLE CAUSES COURTESY LAMP SWITCH SENSE CIRCUIT OPEN COURTESY LAMP DRIVER CIRCUIT SHORT TO VOLTAGE INOPERATIVE BULBS OPEN FUSED B+ CIRCUIT INTERIOR LAMP DEFEAT CIRCUIT SHORT TO GROUND CENTRAL TIMER MODULE HEADLAMP SWITCH TEST ACTION APPLICABILITY 1 Turn the ignition off. All Yes → No → Repair the Courtesy Lamp Switch Sense Circuit for an open 2 Turn the ignition off. All Yes → No → Repair the Courtesy Lamp Driver Circuit for a short to voltage. 3 Remove and inspect the inoperative bulbs All Yes → No → Replace the inoperative bulbs. 4 Measure the voltage of the Fused B+ Circuit to one of the Courtesy Lamps. All Yes → No → Repair the open Fused B+ Circuit. 241 INTERIOR LIGHTING |