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Pinpoint Test R: The Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. R1 CHECK THE STOPLAMP OPERATION 
    • Press and release the brake pedal while observing the rear lamps.
    • Do the stoplamps operate correctly? 
    1. Yes  : GO to R2.
    2. No  : REFER to STOPLAMPS .
  2. R2 CHECK CIRCUIT 298 (VT/OG) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Digital Transmission Range (TR) Sensor (Automatic Transmission) C167.
    • Disconnect: Reversing Lamp Switch (Manual Transmission) C169.
    • Key in ON position.
    • Measure the voltage between the digital TR sensor C167 pin 9, circuit 298 (VT/OG) (A/T), harness side and ground; or between the reversing lamp switch C169 pin 2, circuit 298 (VT/OG) (M/T), harness side and ground.
      Fig 1: Checking Circuit 298 (VT/OG) For Voltage
      G03277219Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to  R4.
    2. No  : GO to R3.
  3. R3 CHECK THE SMART JUNCTION BOX (SJB) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280b.
    • Measure the resistance between the SJB C2280b pin 7, circuit 298 (VT/OG), component side and the SJB C2280b pin 17, circuit 687 (GY/YE), component side.
      Fig 2: Checking Smart Junction Box (SJB) For An Open
      G03277220Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : REPAIR circuit 298 (VT/OG). TEST the system for normal operation.
    2. No  : GO to R5.
  4. R4 CHECK CIRCUIT 140 (BK/PK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the digital TR sensor C167 pin 11, circuit 140 (BK/PK) (A/T), harness side and ground; or between the reversing lamp switch C169 pin 1, circuit 140 (BK/PK) (M/T), harness side and ground.
      Fig 3: Checking Circuit 140 (BK/PK) For An Open
      G03277221Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : INSTALL a new digital TR sensor or reversing lamp switch. REFER to TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS or MANUAL TRANSAXLE/TRANSMISSION accordingly. TEST the system for normal operation.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  5. R5 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • Disconnect all SJB connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all SJB connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
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