Explorer 2WD V6-4.0L (2009)
For the 4-pin connector, GO to Z8.
For the 7-pin connector, GO to Z7.
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Z7 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (7-PIN)
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Disconnect: Trailer Tow C473.
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While applying the brake pedal, measure the voltage between the trailer tow C473-1, circuit CAT06 (YE), 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 Z8.
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Z8 CHECK CIRCUIT CAT06 (YE) FOR AN OPEN
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Disconnect: SJB C2280a.
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Measure the resistance between the SJB C2280a-14, circuit CAT06 (YE), harness side and the trailer tow C439-2 (4-pin) or C473-1 (7-pin),
circuit CAT06 (YE), harness side.
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Is the resistance less than 5 ohms?
Yes
GO to Z9.
No
REPAIR the circuit. TEST the system for normal operation.
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Z9 CHECK FOR CORRECT SJB OPERATION
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Disconnect all the SJB connectors.
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Check for:
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corrosion
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damaged pins
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pushed-out pins
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Connect all the SJB connectors and make sure they seat correctly.
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Operate the system and verify the concern is still present.
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Is the concern still present?
Yes
