F 250 2WD Super Duty V8-5.4L (2008)
Trailer Lamps: Pinpoint Tests
Test X: The Trailer Lamps Are Inoperative - All
PINPOINT TEST X: THE TRAILER LAMPS ARE INOPERATIVE - ALL
Normal Operation
The trailer tow connector receives ground through circuit RAT08 (WH). This circuit is the shared ground for all of the trailer lamps.
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
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Trailer tow connector
-
Trailer
X1-X2
Test Y: The Individual Trailer Lamp Is Inoperative - Trailer Stop/Turn Lamp
PINPOINT TEST Y: THE INDIVIDUAL TRAILER LAMP IS INOPERATIVE - TRAILER STOP/TURN LAMP
Normal Operation
The trailer tow LH stop/turn relay coil receives voltage through circuit CLS18 (GY/BN) when the vehicle LH rear stoplamp is illuminated. When the
trailer tow LH stop/turn relay is energized, the voltage is routed to the trailer tow connector through circuit CAT06 (YE).
