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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 909 (Exterior Lighting System) >> Diagnostic Tests >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test Q: The Reversing Lamps Are Inoperative >> Pinpoint Test Q: The Reversing Lamps Are Inoperative

Pinpoint Test Q: The Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. Q1 CHECK THE STOPLAMP OPERATION 
    • Key in OFF position.
    • Apply and release the brake pedal while observing the stoplamp.
    • Do the stoplamp operate correctly? 
    1. YES  : Go to  Q2.
    2. NO  : REFER to Stoplamp  in this article.
  2. Q2 CHECK CIRCUIT CBP20 (YE/VT) FOR VOLTAGE 
    • Disconnect: Digital TR Sensor C167
    • Disconnect: Reversing Lamp Switch C169
    • Key in ON position.
    • Measure the voltage between the digital TR sensor C167-9, circuit CBP20 (YE/VT), harness side and ground; or between the reversing lamp switch C169-2, circuit CBP20 (YE/VT), harness side and ground.
      Fig 1: Measuring Voltage Between Digital TR Sensor C167-9, CBP20 (YE/VT), Harness Side & Ground
      GF0011114Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  Q4.
    2. NO  : VERIFY the SJB fuse 20 (10A) is OK. If OK, go to  Q3 .
  3. Q3 CHECK CIRCUIT CBP20 (YE/VT) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280b
    • Measure the resistance between the digital TR sensor C167-9, circuit CBP20 (YE/VT), harness side and the SJB C2280b-23, circuit CBP20 (YE/VT), harness side; or between the reversing lamp switch C169-2, circuit CBP20 (YE/VT), harness side and the SJB C2280b-23, circuit CBP20 (YE/VT), harness side.
      Fig 2: Measuring Resistance Between Digital TR Sensor C167-9, CBP20 (YE/VT) & SJB C2280b-23, CBP20 (YE/VT)
      GF0011115Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  Q5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. Q4 CHECK CIRCUIT CET41 (BN/YE) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the digital TR sensor C167-11, circuit CET41 (BN/YE), harness side and ground; or between the reversing lamp switch C169-1, circuit CET41 (BN/YE), harness side and ground.
      Fig 3: Measuring Resistance Between Digital TR Sensor C167-11, CET41 (BN/YE), Harness Side & Ground
      GF0011116Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : For an automatic transmission, INSTALL a new digital TR sensor. REFER to AUTOMATIC TRANSMISSION - 5R44E AND 5R55E article. TEST the system for normal operation.

      For a manual transmission, INSTALL a new reversing lamp switch. TEST the system for normal operation.

    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. Q5 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the 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 MODULES article. TEST the system for normal operation.
    2. 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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