Pinpoint Test A : Both Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE STOPLAMP OPERATION
- Ignition ON.
- Apply the brake pedal while observing all the stoplamps.
Do the stoplamps illuminate?

Yes If equipped with a manual transmission, GO to A2 If equipped with an automatic transmission, GO to A5

No REFER to: Stoplamps .

A2 BYPASS THE REVERSING LAMP SWITCH

Apply the parking brake.

Ignition OFF.

Disconnect: Reversing Lamps Switch C169.

Ignition ON.

Connect a fused jumper wire:

Positive Lead	Measurement / Action	Negative Lead
C169-1	Courtesy of FORD MOTOR COMPANY	C169-2

Do the reversing lamps illuminate?

Yes	REMOVE the jumper wire. INSTALL a new reversing lamps switch.

No	REMOVE the jumper wire. GO to A3

A3 BYPASS THE REVERSING LAMP SWITCH GROUND CIRCUIT

Connect a fused jumper wire:

Positive Lead	Measurement / Action	Negative Lead
C169-1	Courtesy of FORD MOTOR COMPANY	Ground

Do the reversing lamps illuminate?

Yes

GO to A4

No	REPAIR the circuit

A4 CHECK THE REVERSING LAMP SWITCH CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: PCM C175B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C169-1	Courtesy of FORD MOTOR COMPANY	C175B-32

Is the resistance less than 3 ohms?

Yes	For vehicles with a pickup bed and incandescent rear lamps, GO to A6 For all others, GO to A7

No	REPAIR the circuit

A5 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 For vehicles with a pickup bed and incandescent rear lamps, GO to A6 For all others, GO to A7

No DIAGNOSE the transmission range concern. REFER to: External Controls .

A6 CHECK THE REVERSING LAMPS GROUND CIRCUIT

Place the gear selector in PARK (P).

Ignition OFF.

Disconnect: For vehicle not equipped with BLIS, LH Reversing Lamp C487.

Disconnect: For vehicle equipped with BLIS, LH Reversing Lamp C451.

For vehicle not equipped with BLIS, measure:

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

For vehicle equipped with BLIS, measure:

Positive Lead	Measurement / Action	Negative Lead
C1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to A7

No	REPAIR the circuit.

A7 CHECK THE REVERSING LAMP VOLTAGE CIRCUITS FOR VOLTAGE

Place the gear selector in PARK (P).

Ignition OFF.

Disconnect: For vehicles without a pickup bed, LH Rear Lamp C423.

Disconnect: For LED rear lamps, LH Rear Lamp C4483.

Ignition ON.

Place the gear selector in REVERSE (R).

For vehicles without a pickup bed, measure:

Positive Lead	Measurement / Action	Negative Lead
C423-1	Courtesy of FORD MOTOR COMPANY	Ground

For incandescent rear lamps and not equipped with BLIS, measure:

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

For incandescent rear lamps and equipped with BLIS, measure:

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

For LED rear lamps, measure:

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

Is the voltage greater than 11 volts?

Yes

GO to A12

GO to A8

A8 REPEAT THE ON-DEMAND SELF-TEST AND CHECK THE REVERSING LAMP VOLTAGE CIRCUITS FOR VOLTAGE

Place the gear selector in PARK (P).

Using a diagnostic scan tool, perform the BCM self-test.

Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver if DTC U1000:00 is present).

Place the gear selector in REVERSE (R).

For vehicles without a pickup bed, measure:

Positive Lead	Measurement / Action	Negative Lead
C423-1	Courtesy of FORD MOTOR COMPANY	Ground

For incandescent rear lamps and not equipped with BLIS, measure:

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

For incandescent rear lamps and equipped with BLIS, measure:

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

For LED rear lamps, measure:

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

Is the voltage greater than 11 volts?

Yes	For vehicles without a pickup bed and vehicles with a bed and incandescent lamps, INSTALL a new LH reversing lamp bulb. If the symptom returns, INSTALL a new LH rear lamp assembly. REFER to: Rear Lamp Assembly . For LED rear lamps, INSTALL a new LH rear lamp assembly. REFER to: Rear Lamp Assembly .

GO to A9

A9 DISCONNECT THE RH (RIGHT-HAND) REAR OR REVERSING LAMP AND REPEAT THE ON-DEMAND SELF-TEST AND CHECK THE REVERSING LAMP VOLTAGE CIRCUITS FOR VOLTAGE

Place the gear selector in PARK (P).

Ignition OFF.

Disconnect: For vehicles without a pickup bed, RH Rear Lamp C422.

Disconnect: For incandescent rear lamps and not equipped with BLIS, RH Reversing Lamp C488.

Disconnect: For incandescent rear lamps and equipped with BLIS, RH Reversing Lamp C461.

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

Ignition ON.

Using a diagnostic scan tool, perform the BCM self-test.

Clear the Diagnostic Trouble Codes (DTCs) and repeat the self-test (required to enable the lamp output driver if DTC U1000:00 is present).

Place the gear selector in REVERSE (R).

For vehicles without a pickup bed, measure:

Positive Lead	Measurement / Action	Negative Lead
C422-1	Courtesy of FORD MOTOR COMPANY	Ground

For incandescent rear lamps and not equipped with BLIS, measure:

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

For incandescent rear lamps and equipped with BLIS, measure:

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

For LED rear lamps, measure:

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

Is the voltage greater than 11 volts?

Yes	For vehicles without a pickup bed and vehicles with a bed and incandescent lamps, INSTALL a new RH reversing lamp bulb. If the symptom returns, INSTALL a new RH rear lamp assembly. REFER to: Rear Lamp Assembly . For LED rear lamps, INSTALL a new RH rear lamp assembly. REFER to: Rear Lamp Assembly .

GO to A10

A10 CHECK THE REVERSING LAMP VOLTAGE CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Disconnect: BCM C2280C.

For vehicles without a pickup bed, measure:

Positive Lead	Measurement / Action	Negative Lead
C422-1	Courtesy of FORD MOTOR COMPANY	Ground

For incandescent rear lamps and not equipped with BLIS, measure:

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

For incandescent rear lamps and equipped with BLIS, measure:

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

For LED rear lamps, measure:

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

Is the resistance greater than 10, 000 ohms?

Yes

GO to A11

REPAIR the circuit 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 Guided Routine .

A11 CHECK THE REVERSING LAMP VOLTAGE CIRCUITS FOR AN OPEN

For vehicles without a pickup bed, measure:

Positive Lead	Measurement / Action	Negative Lead
C422-1	Courtesy of FORD MOTOR COMPANY	C2280C-11

For incandescent rear lamps and not equipped with BLIS, measure:

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

For incandescent rear lamps and equipped with BLIS, measure:

Positive Lead	Measurement / Action	Negative Lead
C461-2	Courtesy of FORD MOTOR COMPANY	C2280C-11

For LED rear lamps, measure:

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 A12

No	REPAIR the circuit in question.

A12 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 Guided Routine .

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.