Flex FWD V6-3.5L (2010)
The Smart Junction Box (SJB) fuse 2 (15A) supplies voltage to both trailer tow stop/turn relays.
The trailer tow LH stop/turn relay coil receives voltage when the vehicle LH rear stoplamp is illuminated. When the trailer tow LH stop/turn relay is
energized, the voltage is routed to the trailer tow LH stop/turn relay and the trailer tow connector.
The trailer tow RH stop/turn relay coil receives voltage when the vehicle RH rear stoplamp is illuminated. When the trailer tow RH stop/turn relay is
energized, the voltage is routed to the trailer tow RH stop/turn relay and the trailer tow connector.
This pinpoint test is intended to diagnose the following:
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Fuse
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Wiring, terminals or connectors
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Trailer tow connector
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Trailer tow stop/turn relay
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Trailer
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SJB
PINPOINT TEST Z: THE TRAILER STOP/TURN LAMP IS 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 mounted on the bumper for signs of corrosion or damage. Repair or
install a new trailer tow connector as required.
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Z1 DETERMINE IF BOTH TRAILER STOP/TURN LAMPS ARE INOPERATIVE
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Ignition OFF.
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Determine if both trailer stop/turn lamps are inoperative.
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Are both trailer stop/turn lamps inoperative?
Yes
VERIFY the SJB fuse 2 (15A) is OK. If OK, GO to Z2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
See: Diagrams/Electrical Diagrams/Diagrams By Number
No
GO to Z3.
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Z2 CHECK THE TRAILER TOW STOP/TURN RELAY VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
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Disconnect: Trailer Tow LH Stop/Turn Relay.
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Disconnect: SJB C2280d.
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Measure the resistance between the trailer tow LH stop/turn relay pin 3, circuit SBP02 (YE/RD), BJB face side and the SJB C2280d-13, circuit
SBP02 (YE/RD), harness side.
