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Home >> Ford >> 2014 >> F-150 FX2, 2D Pickup >> Repair and Diagnosis >> External Pages >> Different car >> Section 348 (Exterior Lighting System) >> Diagnosis And Testing >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test U: Both Reversing Lamps Are Inoperative >> Pinpoint Test U: Both Reversing Lamps Are Inoperative

Pinpoint Test U: Both Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. U1 CHECK THE STOPLAMP OPERATION 
    • Ignition OFF.
    • Apply the brake pedal while observing all the stoplamps.
    • Do the stoplamps illuminate? 
  2. U2 CHECK THE BCM OUTPUT 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: BCM DataLogger.
    • Select the BCM reverse lamps active command (RVRS_LMPS). Command the reverse lamps on then off.
    • Do the reversing lamps illuminate when commanded on? 
  3. U3 BYPASS THE REVERSING LAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Reversing Lamp Switch C169.
    • Connect a fused jumper wire between the reversing lamp switch C169-1, circuit CET47 (GY/OG or BU), harness side and the reversing lamp switch C169-2, circuit GD124 or GD120 (BK/VT or BK), harness side.
      Fig 1: Connecting Fused Jumper Wire Between Reversing Lamp Switch C169-1, Circuit CET47 (GY/OG Or BU) And C169-2, Circuit GD124 Or GD120 (BK/VT Or BK)
      G07485094Courtesy of FORD MOTOR CO.
    • Ignition ON.
    • Do the reversing lamps illuminate? 
    • Yes  : REMOVE the jumper wire. INSTALL a new reversing lamp switch. TEST the system for normal operation.
    • No  : REMOVE the jumper wire. GO to U4.
  4. U4 BYPASS THE REVERSING LAMP SWITCH GROUND CIRCUIT 
    • Connect a fused jumper wire between the reversing lamp switch C169-1, circuit CET47 (GY/OG or BU), harness side and ground.
      Fig 2: Connecting Fused Jumper Wire Between Reversing Lamp Switch C169-1, Circuit CET47 (GY/OG Or BU), Harness Side And Ground
      G07485095Courtesy of FORD MOTOR CO.
    • Do the reversing lamps illuminate? 
    • Yes  : REMOVE the jumper wire. REPAIR circuit GD124 or GD120 (BK/VT or BK) for an open. TEST the system for normal operation.
    • No  : REMOVE the jumper wire. GO to U5.
  5. U5 CHECK THE REVERSING LAMP SWITCH INPUT CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • Disconnect: PCM C175t.
    • Measure the resistance between the reversing lamp switch C169-1, circuit CET47 (GY/OG or BU), harness side and the PCM C175t-7, circuit CET47 (GY/OG or BU), harness side.
      Fig 3: Measuring Resistance Between Reversing Lamp Switch C169-1, Circuit CET47 (GY/OG Or BU) And PCM C175T-7, Circuit CET47 (GY/OG Or BU)
      G07485096Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  U7.
    • No  : REPAIR circuit CET47 (GY/OG or BU) for an open.

      TEST the system for normal operation.

  6. U6 BYPASS THE BCM 
    NOTE: If the jumper wire fails, refer to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. After the repair: If no DTCs are present, test the system for normal operation. If DTC U1000:00 is present, clear the DTCs and  repeat the self-test (required to enable the reversing lamp output driver if DTC U1000:00 is present)  . Test the system for normal operation. If DTC U3000:49 is present, install a new BCM. Refer to MULTIFUNCTION ELECTRONIC MODULES . Test the system for normal operation.
    • Ignition OFF.
    • Disconnect: BCM C2280d.
    • Connect a fused jumper wire between the BCM C2280d-13, circuit CLS28 (BU/WH), harness side and battery positive.
      Fig 4: Connecting Fused Jumper Wire Between BCM C2280D-13, Circuit CLS28 (BU/WH) And Battery Positive
      G07485097Courtesy of FORD MOTOR CO.
    • Do the reversing lamps illuminate? 
    • Yes  : REMOVE the jumper wire. GO to  U8.
    • No  : REMOVE the jumper wire. REPAIR circuit CLS28 (BU/WH) for an open. TEST the system for normal operation.
  7. U7 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the PCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES .

      TEST the system for normal operation.

    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  8. U8 CHECK FOR CORRECT BCM OPERATION 
    • Disconnect the BCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the BCM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new BCM. REFER to MULTIFUNCTION ELECTRONIC MODULES .

      TEST the system for normal operation.

    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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