Initial Inspection and Diagnostic Overview

1. Verify the customer concern by operating the trailer towing package.
2. Visually inspect for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
^ Battery Junction Box (BJB) fuse:
- 20 (7.5 A)
- 22 (7.5 A)
- 4 (20 A)
- 110 (30 A)
- 115 (30 A)
^ Circuitry
^ Lamps
^ Trailer tow parking lamps relay
^ Trailer tow backup lamps relay
^ Trailer tow battery charge relay
^ Trailer tow electric brake controller

3. If the concern is not visually evident, verify the symptom and proceed to the Symptom Chart. Symptom Related Diagnostic Procedures