LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2021 >> Expedition Platinum, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 453 (Exterior Lighting (2 Of 2)) >> Diagnosis And Testing >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test A : One Or Both Reversing Lamps Are Inoperative >> Pinpoint Test A : One Or Both Reversing Lamps Are Inoperative

Pinpoint Test A : One Or Both Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

  1. A1 CHECK THE PCM (POWERTRAIN CONTROL MODULE) GEAR COMMANDED PID (PARAMETER IDENTIFICATION)

    • Apply the parking brake.

    • Ignition ON.

    • Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

    • Monitor the Gear Commanded (GEAR_CMD) 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 .

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

    • Ignition OFF.

    • Disconnect: BCM C2280C.

    • Disconnect: For incandescent rear lamps, LH Rear Lamp C4035 and RH Rear Lamp C4032.

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

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

    • For incandescent rear lamps, measure:
      Positive Lead Measurement / Action Negative Lead
      C4035-2
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For LED rear lamps not equipped with BLIS, measure:
      Positive Lead Measurement / Action Negative Lead
      C412-4
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For LED rear lamps equipped with BLIS, measure:
      Positive Lead Measurement / Action Negative Lead
      C4483-4
      GFD465490Courtesy 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 GUIDED ROUTINE .

  3. A3 CHECK THE REVERSING LAMP VOLTAGE CIRCUITS FOR AN OPEN

    • For incandescent rear lamps, measure:
      Positive Lead Measurement / Action Negative Lead
      C4035-2
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 C2280C-11

    • For LED rear lamps not equipped with BLIS, measure:
      Positive Lead Measurement / Action Negative Lead
      C412-4
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 C2280C-11

    • For LED rear lamps equipped with BLIS, measure:
      Positive Lead Measurement / Action Negative Lead
      C4483-4
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 C2280C-11

    Is the resistance less than 3 ohms? 

    Yes  GO to  A7
    No  REPAIR the circuit in question.

  4. A4 CHECK FOR VOLTAGE TO THE REVERSING LAMP

    • Ignition OFF.

    • Apply the parking brake.

    • Disconnect: For incandescent rear lamps, inoperative LH Rear Lamp C4035 or RH Rear Lamp C4032.

    • 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 Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4035-2
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4032-2
      GFD465489Courtesy 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
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C415-4
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For LED rear lamps equipped with BLIS, measure:

      LH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4483-4
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4484-4
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  A6
    No  GO to  A5

  5. A5 CHECK THE REVERSING LAMP SUPPLY CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • For incandescent rear lamps, measure:

      LH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4035-2
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 C2280C-11

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4032-2
      GFD465490Courtesy 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
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 C2280C-11

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C415-4
      GFD465490Courtesy 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
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 C2280C-11

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4484-4
      GFD465490Courtesy of FORD MOTOR COMPANY
      		 C2280C-11

    Is the resistance less than 3 ohms? 

    Yes  GO to  A7
    No  REPAIR the circuit.

  6. A6 CHECK THE REVERSING LAMP GROUND CIRCUIT FOR AN OPEN

    • For incandescent rear lamps, measure:

      LH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4035-2
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 C4035-6

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4032-2
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 C4032-6

    • For LED rear lamps not equipped with BLIS, measure:

      LH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C412-4
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 C412-1

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C415-4
      GFD465489Courtesy 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
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 C4483-1

      RH Rear Lamp 

      Positive Lead Measurement / Action Negative Lead
      C4484-4
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 C4484-1
      C4484-4
      GFD465489Courtesy of FORD MOTOR COMPANY
      		 C4484-9

    Is the voltage greater than 11 volts? 

    Yes  For an incandescent rear lamp, CHECK the rear lamp harness for open or shorted circuits and damaged or pushed-out pins. If the harness is OK, INSTALL a new reversing lamp bulb. REFER to: Rear Lamp Bulb . . If the harness is not OK, REPAIR the harness. If the harness cannot be repaired, INSTALL a new rear lamp harness. For LED rear lamps, INSTALL a new rear lamp assembly. REFER to: Headlamp Assembly .
    No  REPAIR the circuit in question.

  7. 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 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.
scientia non olet · About LEMON Manuals