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Symptom: *BACKUP LAMPS INOPERATIVE POSSIBLE CAUSES OPEN BACKUP LAMP BULB(S) BACKUP LAMP GROUND CIRCUIT OPEN BACKUP LAMP SUPPLY CIRCUIT OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN TRANSMISSION RANGE SENSOR INTERMITTENT BACKUP LAMPS TEST ACTION APPLICABILITY 1 Ignition on, engine not running. All Yes → Go To 2 No → Go To 3 2 If one backup lamp works, the problem must be in the bulb or the wiring to the one All Repair Repair as necessary. 3 Turn the ignition off to the lock position. 9Reverse Light Test9 button on the Transmission Simulator while observing the Back-up Lamps. All Yes → Replace the Transmission Range Sensor per the Service Informa- tion. No → Go To 4 4 Remove both Backup Lamp bulbs. All Yes → Replace the Backup Lamp bulb(s). Verify the bulbs illuminate with the Transmission Simulator. No → Go To 5 172 TRANSMISSION - NGC |