Mountaineer 2WD V8-4.6L (2010)
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For the 4-pin connector, measure the voltage between the trailer tow C439-3, 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?
Yes
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
No
VERIFY the SJB fuse 25 (15A) is OK.
If OK for the 4-pin connector, GO to X3.
If OK for the 7-pin connector, GO to X2.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. See: Diagrams/Electrical Diagrams/Diagrams By Number
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X2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (7-PIN)
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Disconnect: Trailer Tow C473.
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Measure the voltage between the trailer tow C473-6, circuit CAT17 (BN), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
INSTALL a new trailer tow connector. TEST the system for normal operation.
No
GO to X3.
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X3 CHECK THE TRAILER TOW PARKING LAMP CIRCUIT FOR AN OPEN
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Place the headlamp switch in the OFF position.
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Disconnect: SJB C2280a.
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Measure the resistance between the SJB C2280a-13, circuit CAT17 (BN), harness side and the trailer tow C439-3 (4-pin connector) or C473-6
(7-pin connector), circuit CAT17 (BN), harness side.
