Expedition 2WD V8-5.4L (2009)
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Is the voltage greater than 10 volts?
Yes
REPAIR circuit CAT16 (GY/BN) for an open. TEST the system for normal operation.
No
REPAIR circuit CLS10 (GY/BN) for an open. TEST the system for normal operation.
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Pinpoint Test AC: The Trailer Lamps Are On Continuously
Trailer Lamps
Pinpoint Tests
Pinpoint Test AC: The Trailer Lamps Are On Continuously
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation - Trailer Tow Turn/Stoplamp
The trailer tow LH turn relay coil receives voltage through circuit CLS18 (GY/BN) when the vehicle LH rear stoplamp is illuminated. When the trailer
tow LH turn relay is energized, the voltage is routed to the trailer tow connector through circuit CAT06 (YE).
The trailer tow RH turn relay coil receives voltage through circuit CLS19 (VT/OG) when the vehicle RH rear stoplamp is illuminated. When the trailer
tow RH turn relay is energized, the voltage is routed to the trailer tow connector through circuit CAT09 (GN).
Trailer Tow Parking
The trailer tow parking lamp relay coil receives voltage through circuit CLS30 (VT/WH) when the vehicle parking lamps are illuminated. When the
trailer tow parking lamp relay is energized, the voltage is routed to the trailer tow connector through circuit CAT11 (BN).
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Trailer tow relay
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Trailer
PINPOINT TEST AC: THE TRAILER LAMPS ARE ON CONTINUOUSLY
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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AC1 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR
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Ignition ON.
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Measure the voltage between the trailer tow 4-pin connector, harness side and ground as follows:
