Flow of Diagnosis

1. Verify the customer's concern by operating the backup lamps to duplicate the condition.
2. Inspect to determine if one of the mechanical or electrical concerns apply:

Mechanical
- Damaged Transmission Range (TR) sensor.

Electrical
- Circuitry open/shorted.
- Blown fuse junction panel, Fuse 5 (15 A).
- Bulb burned out.

3. If the inspection reveals obvious concern(s) that can be readily identified, service as required.
4. If the concern(s) remains after the inspection, determine the symptom(s) and go to the Symptom Chart. Symptom Related Diagnostic Procedures