ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 6608 > < Initial Inspection and Diagnostic Overview|Page 6606
Page 7
background image

No

REPAIR circuit GD120 (BK/GN) for an open. TEST the system for normal operation.

-------------------------------------------------

Pinpoint Test AB: The Trailer Lamps Are On Continuously

Trailer Lamps

Pinpoint Tests

Pinpoint Test AB: The Trailer Lamps Are On Continuously

Refer to Wiring Diagram Set 95 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Trailer/Camper Adapter for schematic and connector information.  
See: Diagrams/Electrical Diagrams/Diagrams By Number

Normal Operation - Trailer Tow Stop/Turn Lamp

The trailer tow LH stop/turn relay coil receives voltage when the vehicle LH rear stoplamp is illuminated. When the trailer tow LH stop/turn relay is
energized, voltage is routed to the trailer tow connector.

The trailer tow RH stop/turn relay coil receives voltage when the vehicle RH rear stoplamp is illuminated. When the trailer tow RH stop/turn relay is
energized, voltage is routed to the trailer tow connector.

Trailer Tow Parking

The trailer tow parking lamp relay coil receives voltage when the vehicle parking lamps are illuminated. When the trailer tow parking lamp relay is
energized, voltage is routed to the trailer tow connector.

This pinpoint test is intended to diagnose the following:

-

Wiring, terminals or connectors

-

Trailer tow relay

-

Trailer

PINPOINT TEST AB: THE TRAILER LAMPS ARE ON CONTINUOUSLY

NOTICE:  Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.

-------------------------------------------------
AB1 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR

-

Ignition OFF.

-

Disconnect: Trailer Tow C439.

-

Ignition ON.

-

Measure the voltage the between trailer tow connector, harness side and ground as follows:

-

Is any voltage present?

Yes

Initial Inspection and Diagnostic Overview|Page 6608 > < Initial Inspection and Diagnostic Overview|Page 6606