Inspection and Verification
WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the customer concern.
- Verify the exterior lighting system of the vehicle is operating correctly. If not, refer to the appropriate pinpoint test in this article.
- Visually inspect the following for obvious signs of electrical damage.VISUAL INSPECTION CHART
Electrical - Central junction box (CJB) fuse(s):
- 10 (20A) (trailer tow parking and reversing lamps)
- 13 (10A) (trailer tow battery charge relay coil side)
- 36 (10A) (trailer tow RH stop/turn)
- 42 (10A) (trailer tow LH stop/turn)
- 105 (30A) (trailer tow electric brakes)
- 106 (30A) (trailer tow battery charge relay switch side)
- Trailer brake control module
- Circuity
- Relay(s)
- Bulb(s)
NOTE: When diagnosing the trailer tow lamps, begin by verifying that the vehicle lamp systems are all functioning correctly with the trailer disconnected. - Central junction box (CJB) fuse(s):
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the concern is not visually evident, verify the symptom. Go to Symptom Chart .