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Pinpoint Test V: The Reversing Lamps Are On Continuously

WARNING: This page is about a different car, the 2009 Ford Mustang. 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. V1 RETRIEVE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Key in OFF position.
    • Retrieve the recorded results from the SJB self-test.
    • Was DTC B2525 or B2532 present? 
    1. YES  : Go to  V2.
    2. NO  : Go to  V3.
  2. V2 CHECK CIRCUITS 1362 (DG/OG) AND 1367 (WH/YE) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280d
    • Key in ON position.
    • Does either reversing lamp continue to illuminate? 
    1. YES  : REPAIR circuit 1362 (DG/OG) (LH reversing lamp) or circuit 1367 (WH/YE) (RH reversing lamp) as necessary. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  V6.
  3. V3 CHECK THE PCM 
    • Disconnect: PCM C175t
    • Key in ON position.
    • Do the reversing lamps continue to illuminate? 
    1. YES  : Go to  V6.
    2. NO  : If equipped with a manual transmission, go to  V4.

      If equipped with an automatic transmission, REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 5R55S to continue diagnosis of the digital transmission range (TR) sensor.

  4. V4 CHECK THE REVERSING LAMP SWITCH 
    • Key in OFF position.
    • Connect: PCM C175t
    • Disconnect: Reversing Lamp Switch C169
    • Key in ON position.
    • Do the reversing lamps continue to illuminate? 
    1. YES  : Go to  V5.
    2. NO  : INSTALL a new reversing lamp switch. REFER to Reversing Lamp Switch . TEST the system for normal operation.
  5. V5 CHECK CIRCUIT 1789 (VT/WH) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: PCM C175t
      • Fig 1: Checking Circuit 1789 (VT/WH) For A Short To Ground
      GF0046556Courtesy of FORD MOTOR CO.
    • Measure the resistance between the reversing lamp switch C169-A, circuit 1789 (VT/WH), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  V7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. V6 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • 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 . 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. CLEAR the DTCs. REPEAT the self-test.
  7. V7 CHECK FOR CORRECT PCM OPERATION 
    • Key in OFF position.
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the PCM 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 PCM. REFER to ELECTRONIC ENGINE CONTROLS . 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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