Mountaineer 2WD V8-4.6L (2010)
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.
-------------------------------------------------
Y1 CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR
-
Ignition OFF.
-
Disconnect the trailer from the vehicle.
-
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 SJB fuse 16 (10A) is OK. If OK, GO to Y2. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
See: Diagrams/Electrical Diagrams/Diagrams By Number
-------------------------------------------------
Y2 CHECK THE TRAILER TOW REVERSING LAMP CIRCUIT FOR VOLTAGE
-
Disconnect: Trailer Tow C473.
-
Measure the voltage between the trailer tow C473-7, 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 Y3.
-------------------------------------------------
Y3 CHECK THE TRAILER TOW REVERSING LAMP CIRCUIT FOR AN OPEN
-
Select PARK.
-
Ignition OFF.
-
Disconnect: SJB C2280a.
-
Measure the resistance between the SJB C2280a-21, circuit CAT16 (GY/BN), harness side and the trailer tow C473-7, circuit CAT16 (GY/BN),
