Explorer 4WD V6-4.0L (2009)
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Disconnect: SJB C2280a.
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Measure the resistance between the SJB C2280a-26, circuit CAT09 (GN), harness side and the trailer tow C439-1 (4-pin) or C473-4 (7-pin),
circuit CAT09 (GN), harness side.
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Is the resistance less than 5 ohms?
Yes
GO to AA9.
No
REPAIR the circuit. TEST the system for normal operation.
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AA9 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
INSTALL a new SJB. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the
self-test.
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Pinpoint Test AB: The Trailer Lamps Are On Continuously
Trailer Lamps
Pinpoint Tests
Pinpoint Test AB: 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
Voltage to the trailer tow lamps is controlled by the Smart Junction Box (SJB). Circuits CAT06 (YE) and CAT09 (GN) supply voltage to the trailer tow
LH and RH stoplamps.
The trailer tow parking lamps share the same voltage supply with the vehicle parking lamps.
This pinpoint test is intended to diagnose the following:
