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Pinpoint Test R: The Reversing Lamps Are Inoperative

  1. R1 DETERMINE THE TRANSMISSION TYPE 
    • Check the vehicle and determine the type of transmission.
    • Is the vehicle equipped with a manual transmission? 
    • Yes  : GO to  R2.
    • No  : GO to  R7.
  2. R2 BY-PASS THE REVERSING LAMP SWITCH 
    • Key in OFF position.
    • Connect a fused (10A) jumper wire between the reversing lamp switch C1407-2, circuit 15-LG28 (GN/WH), harness side and the reversing lamp switch C1407-1, circuit 15S-LG3 (GN/YE), harness side.
      Fig 1: By-Passing Reversing Lamp Switch
      G03952434Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Do the reversing lamps illuminate? 
    • Yes  : INSTALL a new reversing lamp switch. REFER to REVERSING LAMP SWITCH . TEST the system for normal operation.
    • No  : REMOVE the jumper wire. GO to  R3.
  3. R3 CHECK THE VOLTAGE TO THE REVERSING LAMP SWITCH 
    • Measure the voltage between the reversing lamp switch C1407, pin 2, circuit 15-LG28 (GN/WH), harness side and ground.
      Fig 2: Measuring Voltage Between Reversing Lamp Switch C1407, Pin 2, Circuit 15-LG28 (GN/WH), Harness Side And Ground
      G03952435Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  R5.
    • No  : GO to  R4.
  4. R4 CHECK CIRCUIT 15-LG28 (GN/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CJB C270f.
    • Measure the resistance between the reversing lamp switch C1407-2, circuit 15-LG28 (GN/WH), harness side and the CJB C270f-9, circuit 15-LG28 (GN/WH), harness side.
      Fig 3: Checking Circuit 15-LG28 (GN/WH) For An Open
      G03952436Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR OR INSTALL a new CJB. TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. R5 CHECK THE REVERSING LAMP POWER SUPPLY CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the reversing lamp switch C1407-1, circuit 15-LG3 (GN/YE), harness side and ground.
      Fig 4: Measuring Resistance Between Reversing Lamp Switch C1407-1, Circuit 15-LG3 (GN/YE), Harness Side And Ground
      G03952437Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
    • No  : For a 3-door or 5-door vehicle, GO to  R6.

    For a 4-door or wagon vehicle, REPAIR the reversing lamp power supply circuit. TEST the system for normal operation.

  6. R6 CHECK THE REVERSING LAMP GROUND CIRCUIT FOR AN OPEN (MANUAL) 
    • Disconnect: Reversing Lamp.
    • Measure the resistance between the LH reversing lamp C451-1, circuit 31-LG9 (BK), harness side and ground; or between the LH reversing lamp C461-1, circuit 31-LG16 (BK), harness side and ground.
      Fig 5: Checking Reversing Lamp Ground Circuit For An Open (Manual)
      G03952438Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR the reversing lamp power supply circuit. TEST the system for normal operation.
    • No  : REPAIR the reversing lamp ground circuit. TEST the system for normal operation.
  7. R7 CHECK THE PCM TRANSMISSION PIDs 
    • Key in ON position.
    • Connect the diagnostic tool.
    • Enter the following diagnostic mode on the diagnostic tool: PCM PID.
    • Monitor the PCM transmission range PID while moving the transmission shift lever through all the transmission ranges.
    • Do the transmission ranges agree with the PIDs? 
  8. R8 CHECK CIRCUIT 15S-TA38B (GN/BU) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CJB 270d.
    • Apply the parking brake.
    • Key in ON position.
    • Place the transmission in REVERSE.
    • Measure the voltage between the CJB C270d-14, circuit 15S-TA38B (GN/BU), harness side and ground.
      Fig 6: Measuring Voltage Between CJB C270d-14, Circuit 15S-TA38B (GN/BU), Harness Side And Ground
      G03952439Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : PLACE the transmission in PARK. GO to  R9.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  9. R9 CHECK CIRCUIT 15S-LG9 (GN/BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the CJB C270d-15, circuit 15S-LG9 (GN/BK), harness side and ground.
      Fig 7: Measuring Resistance Between CJB C270d-15, Circuit 15S-LG9 (GN/BK), Harness Side And Ground
      G03952440Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
    • No  : For a 3-door or 5-door vehicle, GO to  R10.

    For a 5-door or wagon, REPAIR the circuit. TEST the system for normal operation.

  10. R10 CHECK THE REVERSING LAMP GROUND CIRCUIT FOR AN OPEN (AUTOMATIC) 
    • Disconnect: Reversing Lamp.
    • Measure the resistance between the LH reversing lamp C451-1, circuit 31-LG9 (BK), harness side and ground; or between the LH reversing lamp C461-1, circuit 31-LG16 (BK), harness side and ground.
      Fig 8: Checking Reversing Lamp Ground Circuit For An Open (Automatic)
      G03952438Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR the reversing lamp power supply circuit. TEST the system for normal operation.
    • No  : REPAIR the reversing lamp ground circuit. TEST the system for normal operation.
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