Expedition 2WD V8-5.4L (2009)
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 C4098-3, circuit CAT11 (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 CAT11 (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
For the 4-pin connector, GO to AA3.
For the 7-pin connector, GO to AA2.
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AA2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (7-PIN)
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Disconnect: Trailer Tow C4099.
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Measure the voltage between the trailer tow C4099-6, circuit CAT11 (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 AA3.
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