PINPOINT TEST AB : An Individual Reversing Lamp Is Inoperative

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

AB1 CHECK FOR VOLTAGE TO THE REVERSING LAMP

Apply the parking brake.

Disconnect: For Expedition, Inoperative LH Reversing Lamp C451 or RH Reversing Lamp C461 .

Disconnect: For Navigator, Inoperative LH Reversing (rear) Lamp C412 or RH Reversing (rear) Lamp C415 .

Ignition ON.

Place the vehicle in REVERSE.

For Expedition, measure:

Rear Lamp-Left

Positive Lead	Measurement / Action	Negative Lead
C451-2	Courtesy of FORD MOTOR COMPANY	Ground

Rear Lamp-Right

Positive Lead	Measurement / Action	Negative Lead
C461-2	Courtesy of FORD MOTOR COMPANY	Ground

For Navigator, measure:

Rear Lamp-Left

Positive Lead	Measurement / Action	Negative Lead
C412-5	Courtesy of FORD MOTOR COMPANY	Ground

Rear Lamp-Right

Positive Lead	Measurement / Action	Negative Lead
C415-5	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	For Expedition, GO to AB2For Navigator, if stoplamps operate correctly, INSTALL a new rear lamp assembly. REFER to Rear Lamp Assembly . If the stoplamps do not operate correctly, REFER to Stoplamps and diagnose the stoplamps.
No	REPAIR the reversing lamp voltage supply circuit for an open.

AB2 CHECK THE REVERSING LAMP GROUND CIRCUIT

Measure:

Rear Lamp-Left

Positive Lead	Measurement / Action	Negative Lead
C451-2	Courtesy of FORD MOTOR COMPANY	C451-1

Rear Lamp-Right

Positive Lead	Measurement / Action	Negative Lead
C461-2	Courtesy of FORD MOTOR COMPANY	C461-1

Is the voltage greater than 11 volts?

Yes	INSTALL a new reversing lamp bulb. REFER to Reversing Lamp Bulb .
No	REPAIR the circuit.