ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 7780 > < Initial Inspection and Diagnostic Overview|Page 7778
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Y5

Test Z: The Trailer Lamps Are Inoperative - Trailer Parking Lamps

PINPOINT TEST Z: THE TRAILER LAMPS ARE INOPERATIVE - TRAILER PARKING LAMPS

Normal Operation

The trailer tow parking lamp relay coil receives voltage through circuit CLS30 (VT/WH) when the vehicle parking lamps are illuminated. The trailer
tow parking lamp relay coil is grounded through circuit GD120 (BK/GN). The battery junction box (BJB) fuse 8 (20A) supplies voltage to the trailer
tow parking lamp relay switch side. When the trailer tow parking lamp relay is energized, the voltage is routed to the trailer tow connector through
circuit CAT11 (BN).

This pinpoint test is intended to diagnose the following:

-

Fuse

-

Wiring, terminals or connectors

-

Trailer tow parking lamp relay

-

Trailer

Z1

Initial Inspection and Diagnostic Overview|Page 7780 > < Initial Inspection and Diagnostic Overview|Page 7778