E 250 V8-5.4L (2008)
T5 Continued
Test U: The Trailer Lamps Are Inoperative - Trailer Reversing Lamps
PINPOINT TEST U: THE TRAILER LAMPS ARE INOPERATIVE - TRAILER REVERSING LAMPS
Normal Operation
The trailer tow reversing lamp relay coil is provided voltage through circuit 140 (BK/PK) when the vehicle reversing lamps are illuminated. Ground
for the trailer tow reversing lamp relay coil is provided through circuit 57 (BK). Voltage for the trailer tow reversing lamp relay switch side is
provided through circuit 1043 (DG/YE). When the trailer tow reversing lamp relay is energized, voltage is routed to the trailer tow connector through
circuit 963 (BK/LG).
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
-
Trailer tow reversing lamp relay
-
Trailer
