Expedition 2WD V8-5.4L (2009)
-
Wiring, terminals or connectors
-
Trailer
PINPOINT TEST AB: THE TRAILER LAMPS ARE INOPERATIVE - TRAILER REVERSING LAMPS
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.
-------------------------------------------------
AB1 CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR
-
Ignition OFF.
-
Apply the parking brake.
-
Ignition ON.
-
Select REVERSE.
-
Measure the voltage between the trailer tow connector pin 7, circuit CAT16 (GY/BN), component side and ground.
-
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 AB2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
-------------------------------------------------
AB2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR
-
Disconnect: Trailer Tow C4099.
-
Measure the voltage between the trailer tow C4099-7, circuit CAT16 (GY/BN), harness side and ground.
-
Is the voltage greater than 10 volts?
Yes
INSTALL a new trailer tow connector. TEST the system for normal operation.
No
GO to AB3.
-------------------------------------------------
AB3 CHECK FOR VOLTAGE TO THE BJB FUSE 58 (15A)
-
Measure the voltage between the BJB fuse 58 (15A), circuit CLS10 (GY/BN), input side and ground.
