Backup Lamps Inoperative

SYMPTOM
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