Initial Inspection and Diagnostic Overview

INSPECTION AND VERIFICATION

1. Verify the customer concern by operating the trailer tow lights.
2. Verify the exterior lighting system of the vehicle is operating correctly. If not, refer to the appropriate pinpoint test.
3. Visually inspect for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
- Central junction box (CJB) fuse:
- 21 (10A)
- 16 (10A)
- Connections
- Circuitry
- Relays
- Bulb(s)

4. If the fault is not visually evident, determine the symptom and proceed to the Symptom Chart. Symptom Related Diagnostic Procedures