Expedition 2WD V8-5.4L (2009)
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Is the voltage greater than 10 volts?
Yes
GO to AA6.
No
VERIFY the BJB fuse 28 (25A) is OK. If OK, REPAIR circuit SBB28 (GN/RD) for an open. TEST the system for normal operation. If not OK, REFER
to the Wiring Diagrams to identify the possible causes of the circuit short.
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AA6 CHECK THE VOLTAGE SUPPLY CIRCUIT TO THE TRAILER TOW PARKING LAMP RELAY USING THE RELAY GROUND
PIN
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Measure the voltage between the trailer tow parking lamp relay pin 3, circuit SBB28 (GN/RD), BJB face side and the trailer tow parking lamp
relay pin 2, circuit GD123 (BK/GY), BJB face side.
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Is the voltage greater than 10 volts?
Yes
REPAIR circuit CAT11 (BN) for an open. TEST the system for normal operation.
No
REPAIR circuit GD123 (BK/GY) for an open. TEST the system for normal operation.
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Pinpoint Test AB: The Trailer Lamps Are Inoperative - Trailer Reversing Lamps
Trailer Lamps
Pinpoint Tests
Pinpoint Test AB: The Trailer Lamps Are Inoperative - Trailer Reversing Lamps
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
The Battery Junction Box (BJB) fuse 58 (15A) receives voltage from circuit CLS10 (GY/BN) when the vehicle reversing lamps are illuminated. The
voltage is then routed to the trailer tow connector through circuit CAT16 (GY/BN).
This pinpoint test is intended to diagnose the following:
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Fuse
