Navigator 2WD V8-5.4L (2007)
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 the following for obvious signs of electrical damage.
VISUAL INSPECTION CHART
Electrical
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Battery junction box (BJB) fuse(s):
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5 (40A) (trailer electric brake controller)
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12 (25A) (trailer tow parking lamps)
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13 (30A) (trailer tow battery charge relay switch side)
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34 (25A) (trailer tow turn relays)
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63 (15A) (trailer tow reversing lamps)
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Smart junction box (SJB) fuse 42 (10A) (trailer tow battery charge relay coil)
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Circuitry
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Trailer tow turn/stop relays
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Trailer tow battery charge relay
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Trailer tow parking lamp relay
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Trailer brake control module
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Trailer
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SJB
4. If the concern is not visually evident, verify the symptom. GO to Symptom Chart. See: Symptom Related Diagnostic Procedures