F 150 2WD V8-4.6L (2008)
AA8 Continued
Tests AB: The Trailer Lamps Are Inoperative - Reversing
PINPOINT TEST AB: THE TRAILER LAMPS ARE INOPERATIVE - REVERSING
Normal Operation
When the vehicle reversing lamps are on, circuit 1043 (DG/YE) supplies voltage to the coil side of the trailer tow reversing lamp relay. Ground is
supplied to the trailer tow reversing lamp relay through the CJB. When the trailer tow reversing lamp relay is energized, voltage is routed from the
CJB fuse 10 (20A) to the trailer tow connector through circuit 140 (BK/PK).
The trailer tow reversing lamp relay is integral to the CJB and not removable.
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Trailer tow connector
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CJB
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Trailer