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Pinpoint Test R: The Reversing Lamps Are Inoperative

  1. R1 CHECK THE VOLTAGE TO THE DTR SENSOR (A/T) OR THE REVERSING LAMP SWITCH (M/T) 
    • Key in OFF position.
    • Disconnect: DTR Sensor C167 (A/T).
    • Disconnect: Reversing Lamp Switch C169 (M/T).
    • Key in ON position.
    • If equipped with A/T, measure the voltage between DTR sensor C167 Pin 9, Circuit 1087 (OG), harness side and ground.
      Fig 1: Checking Voltage To DTR Sensor (A/T)
      G03242687Courtesy of FORD MOTOR CO.
    • If equipped with M/T, measure the voltage between reversing lamp switch C169, Circuit 1087 (OG), harness side and ground.
      Fig 2: Checking Voltage To Reversing Lamp Switch (M/T)
      G03242688Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to R2.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  2. R2 CHECK CIRCUIT 140 (BK/PK) FOR OPEN 
    • Key in OFF position.
    • If equipped with A/T, measure the resistance between DTR sensor C167 Pin 11, Circuit 140 (BK/PK), harness side and ground.
      Fig 3: Checking Resistance Between DTR Sensor C167 Pin 11, Circuit 140 (BK/PK)
      G03242689Courtesy of FORD MOTOR CO.
    • If equipped with M/T, measure the resistance between reversing lamp switch C169, Circuit 140 (BK/PK), harness side and ground.
      Fig 4: Checking Resistance Between Reversing Lamp Switch C169, Circuit 140 (BK/PK)
      G03242690Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  INSTALL a new DTR sensor (A/T) or reversing lamp switch (M/T); REFER to AUTOMATIC TRANSAXLE/TRANSMISSION , MANUAL TRANSAXLE-T50D or MANUAL TRANSAXLE-TR3650 . TEST the system for normal operation.
    2. No:  GO to R3.
  3. R3 CHECK REVERSING LAMPS GROUND 
    • Disconnect: Inoperative Reversing Lamp.
    • Measure the resistance between LH reversing lamp C451, Circuit 1205 (BK), or RH reversing lamp C461, Circuit 1205 (BK), harness side and ground.
      Fig 5: Checking Reversing Lamps Ground
      G03242691Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  REPAIR Circuit 140 (BK/PK) for open. TEST the system for normal operation.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
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