ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 9106 > < Initial Inspection and Diagnostic Overview|Page 9104
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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:

-

Wiring, terminals or connectors

-

Trailer tow connector

-

CJB

-

Trailer

Initial Inspection and Diagnostic Overview|Page 9106 > < Initial Inspection and Diagnostic Overview|Page 9104