E 450 V8-5.4L (2009)
-
Is any voltage present?
Yes
REPAIR circuit CAT06 (YE) (LH turn), circuit CAT09 (GN) (RH turn), or circuit CAT17 (BN) (parking lamps) for a short to voltage. TEST the system
for normal operation.
No
INSTALL a new trailer tow relay in question. TEST the system for normal operation.
-------------------------------------------------
Pinpoint Test X: The Trailer Battery Charging Is Inoperative/Does Not Operate Correctly
Trailer Lamps
Pinpoint Tests
Pinpoint Test X: The Trailer Battery Charging Is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagram Set 95, Trailer/Camper Adapter for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Refer to Wiring Diagram Set 11, Fuse and Relay Information for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
The trailer battery charge relay coil receives voltage from the Smart Junction Box (SJB) fuse 44 (10A) through circuit CBP44 (VT) when the ignition
switch is in the RUN position. Ground for the trailer battery charge relay coil is supplied through circuit GD123 (BK/GY). The Battery Junction Box
(BJB) fuse 63 (30A) supplies voltage to the trailer battery charge relay switch side. When the trailer battery charge relay is energized, the voltage is
routed to the trailer tow connector through circuit CAT14 (OG).
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
Trailer tow connector
-
Trailer battery charge relay
-
Trailer
-
SJB
PINPOINT TEST X: THE TRAILER BATTERY CHARGING IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
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.
-------------------------------------------------
X1 CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR (BATTERY CHARGE INOPERATIVE)
-
Ignition ON.
-
Measure the voltage between the trailer tow connector battery charge voltage supply pin, circuit CAT14 (OG), component side and ground.