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Pinpoint Test F: The AUTOLAMPS Are Inoperative

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. 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. F1 CHECK THE MANUAL HEADLAMP OPERATION 
    • Place the headlamp switch in the HEADLAMPS ON position.
    • Do the headlamps operate correctly? 
    1. YES  : Go to  F2.
    2. NO  : REFER to Headlamps .
  2. F2 CHECK FOR VOLTAGE TO THE LIGHT SENSOR 
    • Key in OFF position.
    • Disconnect: Light Sensor C286
    • Key in ON position.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • Measure the voltage between the light sensor C287-6, circuit VLF14 (BU/BN), harness side and ground.
      • Fig 1: Checking Circuit For Voltage
      GF0023441Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
    1. YES  : INSTALL a new light sensor. REFER to Light Sensor . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  F3.
  3. F3 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. CLEAR the DTCs. REPEAT the self-test.
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