F 150 4WD V8-4.6L VIN 8 (2010)
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Pinpoint Test AA: The Trailer Parking Lamps Are Inoperative
Trailer Lamps
Pinpoint Tests
Pinpoint Test AA: The Trailer Parking Lamps Are Inoperative
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
The trailer tow parking lamp relay coil receives voltage when the vehicle parking lamps are illuminated. Voltage is supplied from the Battery Junction
Box (BJB) fuse 31 (20A) to the trailer tow parking lamp relay switch side. When the trailer tow parking lamp relay is energized, voltage is routed 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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Trailer tow parking lamp relay
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Trailer tow connector
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Trailer
PINPOINT TEST AA: THE TRAILER PARKING LAMPS ARE INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Before beginning diagnostics, visually inspect the trailer tow connector for signs of corrosion or damage. Repair or install a new trailer tow
connector as required.
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AA1 CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR
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Ignition OFF.
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Place the headlamp switch in the PARKING LAMPS ON position.
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For the 4-pin connector, measure the voltage between the trailer tow C439b-3, circuit CAT17 (BN), harness side and ground.
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For the 7-pin connector, measure the voltage between the trailer tow connector pin 6, circuit CAT17 (BN), component side and ground.
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Is the voltage greater than 10 volts?
