F 150 4WD V8-4.6L VIN 8 (2010)
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Measure the voltage between the trailer battery charge relay pin 1, circuit CBB54 (VT/OG), BJB face side and ground.
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Is any voltage present?
Yes
REPAIR circuit CBB54 (VT/OG) for a short to voltage. TEST the system for normal operation.
No
INSTALL a new trailer battery charge relay. TEST the system for normal operation.
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Pinpoint Test AE: The Trailer Electric Brakes Are Inoperative/Always Applied
Trailer Lamps
Pinpoint Tests
Pinpoint Test AE: The Trailer Electric Brakes Are Inoperative/Always Applied
Normal Operation
The Trailer Brake Control (TBC) module is provided voltage at all times by the Battery Junction Box (BJB) fuse 17 (30A). When the brake pedal is
applied, the stoplamp switch sends voltage to the BJB fuse 82 (10A), which then routes voltage to the TBC module. When requested, the TBC module
sends regulated voltage to the trailer tow connector.
This pinpoint test is intended to diagnose the following:
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Fuse
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Wiring, terminals or connectors
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TBC module
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Trailer tow connector
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Trailer
