E 450 V8-5.4L (2009)
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Select REVERSE.
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Measure the voltage between the trailer tow connector reversing lamp voltage supply pin, circuit CAT03 (GY/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 BJB fuse 58 (15A) is OK. If OK, GO to V2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
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V2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR ON THE VEHICLE HARNESS
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Select PARK.
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Ignition OFF.
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Disconnect: Trailer Tow C4099.
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Ignition ON.
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Select REVERSE.
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Measure the voltage between the trailer tow C4099-7, circuit CAT03 (GY/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 V3.
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V3 CHECK FOR VOLTAGE TO THE TRAILER TOW REVERSING LAMP FUSE
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Measure the voltage between the BJB fuse 58 (15A), circuit CLS28 (BU/WH), input side and ground.
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Is the voltage greater than 10 volts?
Yes
REPAIR circuit CAT03 (GY/BN) for an open. TEST the system for normal operation.
