Pinpoint Test A : One Or Both Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2015 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE PCM (POWERTRAIN CONTROL MODULE) TRANSMISSION RANGE PID (PARAMETER IDENTIFICATION)
- Apply the parking brake.
- Ignition ON.
- Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).
- Monitor the Transmission Range (TR) PID.
- Place the gear selector in REVERSE (R).
Does the PID indicate the gear range is in reverse?

Yes If both reverse lamps are inoperative, GO to A2 If an individual reverse lamps are inoperative, GO to A4

No DIAGNOSE the transmission range concern. REFER to: EXTERNAL CONTROLS .

A2 CHECK THE REVERSING LAMP VOLTAGE CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Disconnect: BCM C2280C .

Disconnect: For incandescent rear lamps, LH Reversing Lamp C487 .

Disconnect: For LED rear lamps not equipped with BLIS, LH Rear Lamp C4483 .

Disconnect: For LED rear lamps equipped with BLIS, RH Rear Lamp C4484 .

For incandescent rear lamps, measure:

Positive Lead	Measurement / Action	Negative Lead
C487-3	Courtesy of FORD MOTOR COMPANY	Ground

For LED rear lamps not equipped with BLIS, measure:

LH Rear Parking Lamp

Positive Lead	Measurement / Action	Negative Lead
C412-4	Courtesy of FORD MOTOR COMPANY	Ground

For LED rear lamps equipped with BLIS, measure:

Positive Lead	Measurement / Action	Negative Lead
C4483-4	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to A3

No	REPAIR the in question. After the repair: If no Diagnostic Trouble Codes (DTCs) are present, TEST the system for normal operation. If DTC U1000:00 is present, CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test (required to enable the lamp output driver if DTC U1000:00 is present). If DTC U3000:49 is present, Refer to BCM Hardware Testing .

A3 CHECK THE REVERSING LAMP VOLTAGE CIRCUITS FOR AN OPEN

For incandescent rear lamps, measure:

Positive Lead	Measurement / Action	Negative Lead
C487-3	Courtesy of FORD MOTOR COMPANY	C2280C-11

For LED rear lamps not equipped with BLIS, measure:

LH Rear Parking Lamp

Positive Lead	Measurement / Action	Negative Lead
C412-4	Courtesy of FORD MOTOR COMPANY	C2280C-11

For LED rear lamps equipped with BLIS, measure:

Positive Lead	Measurement / Action	Negative Lead
C4483-4	Courtesy of FORD MOTOR COMPANY	C2280C-11

Is the resistance less than 3 ohms?

Yes

GO to A7

No	REPAIR the circuit in question.

A4 CHECK FOR VOLTAGE TO THE REVERSING LAMP

Ignition OFF.

Apply the parking brake.

Disconnect: For incandescent rear lamps, inoperative LH Reversing Lamp C487 or RH Reversing Lamp C488 .

Disconnect: For LED rear lamps not equipped with BLIS, inoperative LH Rear Lamp C412 or RH Rear Lamp C415 .

Disconnect: For LED rear lamps equipped with BLIS, inoperative LH Rear Lamp C4483 or RH Rear Lamp C4484 .

Ignition ON.

Place the gear selector in REVERSE (R).

For incandescent rear lamps, measure:

LH Reversing Lamp

Positive Lead	Measurement / Action	Negative Lead
C487-3	Courtesy of FORD MOTOR COMPANY	Ground

RH Reversing Lamp

Positive Lead	Measurement / Action	Negative Lead
C488-3	Courtesy of FORD MOTOR COMPANY	Ground

For LED rear lamps not equipped with BLIS, measure:

LH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C412-4	Courtesy of FORD MOTOR COMPANY	Ground

RH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C415-4	Courtesy of FORD MOTOR COMPANY	Ground

For LED rear lamps equipped with BLIS, measure:

LH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C4483-4	Courtesy of FORD MOTOR COMPANY	Ground

RH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C4484-4	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to A6

No	GO to A5

A5 CHECK THE REVERSING LAMP SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

For incandescent rear lamps, measure:

LH Reversing Lamp

Positive Lead	Measurement / Action	Negative Lead
C487-3	Courtesy of FORD MOTOR COMPANY	C2280C-11

RH Reversing Lamp

Positive Lead	Measurement / Action	Negative Lead
C488-3	Courtesy of FORD MOTOR COMPANY	C2280C-11

For LED rear lamps not equipped with BLIS, measure:

LH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C412-4	Courtesy of FORD MOTOR COMPANY	C2280C-11

RH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C415-4	Courtesy of FORD MOTOR COMPANY	C2280C-11

For LED rear lamps equipped with BLIS, measure:

LH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C4483-4	Courtesy of FORD MOTOR COMPANY	C2280C-11

RH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C4484-4	Courtesy of FORD MOTOR COMPANY	C2280C-11

Is the resistance less than 3 ohms?

Yes

GO to A7

No	REPAIR the circuit.

A6 CHECK THE REVERSING LAMP GROUND CIRCUIT FOR AN OPEN

For incandescent rear lamps, measure:

LH Reversing Lamp

Positive Lead	Measurement / Action	Negative Lead
C487-3	Courtesy of FORD MOTOR COMPANY	C487-1

RH Reversing Lamp

Positive Lead	Measurement / Action	Negative Lead
C488-3	Courtesy of FORD MOTOR COMPANY	C488-1

For LED rear lamps not equipped with BLIS, measure:

LH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C412-4	Courtesy of FORD MOTOR COMPANY	C412-1

RH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C415-4	Courtesy of FORD MOTOR COMPANY	C415-1

For LED rear lamps equipped with BLIS, measure:

LH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C4483-4	Courtesy of FORD MOTOR COMPANY	C4483-1

RH Rear Lamp

Positive Lead	Measurement / Action	Negative Lead
C4484-4	Courtesy of FORD MOTOR COMPANY	C4484-1
C4484-4	Courtesy of FORD MOTOR COMPANY	C4484-9

Is the voltage greater than 11 volts?

Yes	For incandescent rear lamps, INSTALL a new reversing lamp bulb. For LED rear lamps, INSTALL a new rear lamp assembly. REFER to: Headlamp Assembly .

No	REPAIR the circuit in question.

A7 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, Refer to BCM Hardware Testing .

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.