Backup Lamps Inoperative

*BACKUP LAMPS INOPERATIVE

POSSIBLE CAUSES:
OPEN LEFT BACK-UP LAMP BULB
OPEN RIGHT BACK-UP LAMP BULB
INTERMITTENT BACKUP LIGHTS
BACK-UP LAMP GROUND CIRCUIT OPEN
BACK-UP LAMP SUPPLY CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
BACK-UP LAMP SUPPLY CIRCUIT SHORT TO GROUND
TRANSMISSION RANGE SENSOR - NO BACKUP LIGHTS