Explorer Sport Trac 2WD V6-4.0L (2009)
Trailer Lamps: Pinpoint Tests
Pinpoint Test W: All The Trailer Lamps Are Inoperative
Trailer Lamps
Pinpoint Tests
Pinpoint Test W: All the Trailer 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
Ground for all the trailer lamps is provided through circuit RAT08 (WH).
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
-
Trailer tow connector
-
Trailer
PINPOINT TEST W: ALL THE TRAILER 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.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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W1 CHECK CIRCUIT RAT08 (WH) FOR AN OPEN TO THE TRAILER TOW CONNECTOR
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Disconnect the trailer from the vehicle.
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Disconnect: Negative Battery Cable.
-
For the 4-pin connector, measure the resistance between the trailer tow C439-4, circuit RAT08 (WH), harness side and ground.
-
For the 7-pin connector, measure the resistance between the trailer tow connector pin 2, circuit RAT08 (WH), component side and ground.
-
Is the resistance less than 5 ohms?
Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
No
