PINPOINT TEST AL : The Trailer Lamps Are On Continuously

NOTE: Before beginning diagnostics, visually inspect the trailer tow connector mounted on the bumper for signs of corrosion or damage. Repair or install a new trailer tow connector as required.

AL1 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR

Ignition ON.

For a trailer tow 4-pin connector, measure:

Positive Lead	Measurement / Action	Negative Lead
C439-1	Courtesy of FORD MOTOR COMPANY	Ground
C439-2		Ground
C439-3		Ground

For a trailer tow 7-pin connector, measure:

Positive Lead	Measurement / Action	Negative Lead
Trailer Tow Connector Pin 1 (Left Stop/Turn)	Courtesy of FORD MOTOR COMPANY	Ground
Trailer Tow Connector Pin 4 (Right Stop/Turn)		Ground
Trailer Tow Connector Pin 6 (Parking)		Ground
Trailer Tow Connector Pin 7 (Reversing)		Ground

Is any voltage present?

Yes	GO to AL2.
No	The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.

AL2 CHECK THE RELAY OUTPUT CIRCUIT TO THE TRAILER TOW CONNECTOR FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect: Suspect Trailer Tow Relay.

Ignition ON.

For a trailer tow 4-pin connector, measure:

Positive Lead	Measurement / Action	Negative Lead
C439-1	Courtesy of FORD MOTOR COMPANY	Ground
C439-2		Ground
C439-3		Ground

For a trailer tow 7-pin connector, measure:

Positive Lead	Measurement / Action	Negative Lead
Trailer Tow Connector Pin 1 (Left Stop/Turn)	Courtesy of FORD MOTOR COMPANY	Ground
Trailer Tow Connector Pin 4 (Right Stop/Turn)		Ground
Trailer Tow Connector Pin 6 (Parking)		Ground
Trailer Tow Connector Pin 7 (Reversing)		Ground

Is any voltage present?

Yes	REPAIR the circuit in question.
No	For the trailer tow parking or reversing lamps, INSTALL a new trailer tow relay. For a trailer tow left or right stop/turn lamp, GO to AL3.

AL3 CHECK FOR VOLTAGE TO THE TRAILER TOW RELAY COIL

For the trailer tow left stop/turn lamp, measure:

Positive Lead	Measurement / Action	Negative Lead
Trailer Tow Left Stop/Turn Relay Pin 2	Courtesy of FORD MOTOR COMPANY	Ground

For the trailer tow right stop/turn lamp, measure:

Positive Lead	Measurement / Action	Negative Lead
Trailer Tow Right Stop/Turn Relay Pin 2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	GO to AL4.
No	INSTALL a new trailer tow relay.

AL4 CHECK THE BCM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect: BCM C2280D.

Ignition ON.

For the trailer tow left stop/turn lamp, measure:

Positive Lead	Measurement / Action	Negative Lead
Trailer Tow Left Stop/Turn Relay Pin 2	Courtesy of FORD MOTOR COMPANY	Ground

For the trailer tow right stop/turn lamp, measure:

Positive Lead	Measurement / Action	Negative Lead
Trailer Tow Right Stop/Turn Relay Pin 2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit in question.
No	GO to AL5.

AL5 CHECK FOR CORRECT BCM OPERATION

Disconnect and inspect all BCM connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the BCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new BCM. REFER to Multifunction Electronic Modules - Without Intelligent Access or REFER to Multifunction Electronic Modules - With Intelligent Access .
No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.