E 350 V8-4.6L SOHC VIN W (2005)
Trailer Lamps: Initial Inspection and Diagnostic Overview
INSPECTION AND VERIFICATION
1. Verify the customer concern.
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
-
Battery junction box (BJB) fuse(s)
-
24 (10A) (trailer tow reversing and parking lamps)
-
26 (10A) (trailer tow stop/turn lamp relays)
-
10 (30A) (trailer tow brake control module)
-
Central junction box (CJB) fuse 15 (5A) (trailer tow battery charge)
-
Relay(s)
-
Circuitry
-
Bulb(s)
4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
5. If the concern is not visually evident, verify the symptom and GO to Symptom Chart. See: Symptom Related Diagnostic Procedures
