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Pinpoint Test T: The Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. T1 CHECK THE DIGITAL TRANSMISSION RANGE (TR) SENSOR ADJUSTMENT 
    WARNING: If equipped with a fire suppression system, refer to FIRE SUPPRESSION SYSTEM for important safety warnings.

    Yes  : GO to T2.

    No  : ADJUST the digital TR sensor. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION . TEST the system for normal operation.

    If equipped with a fire suppression system, REPOWER the system. REFER to FIRE SUPPRESSION SYSTEM .

  2. T2 CHECK CIRCUIT 1789 (VT/WH) FOR AN OPEN 
    • Disconnect: Digital TR Sensor C167.
    • Key in ON position.
    • Measure the voltage between the digital TR sensor C167-9, circuit 1789 (VT/WH), harness side and ground.
      Fig 1: Checking Circuit 1789 (VT/WH) For An Open
      G04585509Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to T3.

    No  : VERIFY the CJB fuse 20 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. If equipped with a fire suppression system, REPOWER the system. REFER to FIRE SUPPRESSION SYSTEM .

  3. T3 CHECK CIRCUIT 140 (BK/PK) FOR AN OPEN 
    • Key in OFF position.
    • Connect a fused (10A) jumper wire between the digital TR sensor C167-9, circuit 1789 (VT/WH), harness side and the digital TR sensor C167-11, circuit 140 (BK/PK), harness side.
      Fig 2: Checking Circuit 140 (BK/PK) For An Open
      G04585510Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Do the reversing lamps illuminate? 

    Yes  : INSTALL a new digital TR sensor. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION . TEST the system for normal operation. If equipped with a fire suppression system, REPOWER the system. REFER to FIRE SUPPRESSION SYSTEM .

    No  : REPAIR the circuit. TEST the system for normal operation. If equipped with a fire suppression system, REPOWER the system. REFER to FIRE SUPPRESSION SYSTEM .

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