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Pinpoint Test Y: The Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Y1 CHECK THE VOLTAGE SUPPLY TO THE REVERSING LAMPS 
    • Key in ON position.
    • Place the multifunction switch in the LH turn position and observe the LH rear turn signal.
    • Does the LR turn signal operate correctly? 
    1. Yes  : GO to Y2.
    2. No  : REFER to TURN SIGNAL AND HAZARD LAMPS  to continue diagnostics.
  2. Y2 CHECK THE PCM 
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Engage the parking brake.
    • Monitor the PCM transmission gear status PID while placing the transmission in reverse and then neutral.
    • Does the PID match with the transmission gear selected? 
    1. Yes  : GO to  Y4.
    2. No  : GO to Y3.
  3. Y3 CHECK FOR PCM OPERATION 
    • Key in OFF position.
    • Disconnect all PCM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all 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 INTAKE AIR, FUEL CHARGING, STARTING & ENGINE ELECTRONICS - 3.0L (4V) - LS or INTAKE AIR, FUEL CHARGING, STARTING & ENGINE ELECTRONICS - 3.9L - LS . 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. REPEAT the self-test.
  4. Y4 CHECK FOR REAR ELECTRONIC MODULE (REM) OPERATION 
    • Key in OFF position.
    • Disconnect all REM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all REM 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 REM. Refer to MODULE COMMUNICATIONS NETWORK . 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. REPEAT the self-test.
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