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Pinpoint Test H: The AUTOLAMPS Are On Continuously

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. H1 CHECK THE SJB AUTOLAMP ON REQUEST PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB  DataLogger.
      • NOTE: Make sure the headlamp switch is in the OFF position when monitoring the PID.
    • Monitor the SJB  headlamp switch PID (HDLMP_AUT_CKT).
    • Does the PID indicate ON? 
    • Yes:  GO to H2  .
    • No:  GO to  H5.
  2. H2 CHECK FOR A VOLTAGE SIGNAL TO THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch C205-9, circuit CLF19 (VT/GN), harness side and ground.
      Fig 1: Measuring Voltage Between Headlamp Switch C205-9, Circuit CLF19 (VT/GN) And Ground
      G06503727Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to H3  .
  3. H3 CHECK THE AUTOLAMPS REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: SJB  C2280b.
    • Measure the resistance between the headlamp switch C205-9, circuit CLF19 (VT/GN), harness side and ground.
      Fig 2: Measuring Resistance Between Headlamp Switch C205-9, Circuit CLF19 (VT/GN) And Ground
      G06503728Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to H4  .
    • No:  REPAIR circuit CLF19 (VT/GN) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  4. H4 CHECK THE AUTOLAMPS REQUEST INPUT CIRCUIT FOR AN OPEN 
    • Measure the resistance between the headlamp switch C205-9, circuit CLF19 (VT/GN), harness side and the SJB  C2280b-50, circuit CLF19 (VT/GN), harness side.
      Fig 3: Measuring Resistance Between Headlamp Switch C205-9, Circuit CLF19 (VT/GN) And SJB C2280B-50, Circuit CLF19 (VT/GN)
      G06503729Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  H15.
    • No:  REPAIR circuit CLF19 (VT/GN) for an open. CLEAR the DTCs. REPEAT the self-test.
  5. H5 USE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB  self-test.
    • Is DTC B2008, B1791 or B1793 present? 
    • Yes:  For DTC B2008, GO to  H7.

      For DTC B1791, GO to  H9.

      For DTC B1793, GO to  H13.

    • No:  GO to H6  .
  6. H6 CHECK FOR VOLTAGE TO THE LIGHT SENSOR (NO DTC) 
    • Ignition OFF.
    • Disconnect: Light Sensor C286 or C287.
    • Ignition ON.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • For vehicles with automatic temperature control, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 4: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN) And Ground
      G06065236Courtesy of FORD MOTOR CO.
    • For vehicles with manual temperature control, measure the voltage between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 5: Measuring Voltage Between Light Sensor C287-A, Circuit VLF14 (BU/BN) And Ground
      G06065237Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
    • Yes:  INSTALL a new light sensor. REFER to LIGHT SENSOR . CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to  H15.
  7. H7 CHECK THE WINDSHIELD WIPER MOTOR 
    • Ignition OFF.
    • Disconnect: Windshield Wiper Motor C1552.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB  Self-Test.
    • Repeat the SJB  self-test.
    • Is DTC B2008 still present? 
    • Yes:  GO to H8  .
    • No:  INSTALL a new windshield wiper motor. REFER to WIPERS AND WASHERS . TEST the system for normal operation.
  8. H8 CHECK WIPERS ON INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SJB  C2280f.
    • Measure the resistance between the windshield wiper motor C1552-2, circuit CRW01 (WH), harness side and ground.
      Fig 6: Measuring Resistance Between Windshield Wiper Motor C1552-2, Circuit CRW01 (WH) And Ground
      G06075642Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to  H15.
    • No:  REPAIR circuit CRW01 (WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  9. H9 CHECK FOR VOLTAGE TO THE LIGHT SENSOR (DTC B1791) 
    • Ignition OFF.
    • Disconnect: Light Sensor C286 or C287.
    • Ignition ON.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • On vehicles with automatic temperature control, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 7: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN) And Ground
      G06065236Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the voltage between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 8: Measuring Voltage Between Light Sensor C287-A, Circuit VLF14 (BU/BN) And Ground
      G06065237Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
    • Yes:  GO to  H12.
    • No:  GO to H10  .
  10. H10 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: SJB  C2280b.
    • Ignition ON.
    • On vehicles with automatic temperature control, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 9: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN) And Ground
      G06065236Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the voltage between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 10: Measuring Voltage Between Light Sensor C287-A, Circuit VLF14 (BU/BN) And Ground
      G06065237Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR circuit VLF14 (BU/BN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to H11  .
  11. H11 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • On vehicles with automatic temperature control, measure the resistance between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and the SJB  C2280b-46, circuit VLF14 (BU/BN), harness side.
      Fig 11: Measuring Resistance Between Light Sensor C286-2, Circuit VLF14 (BU/BN) And SJB C2280B-46, Circuit VLF14 (BU/BN)
      G06065243Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the resistance between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and the SJB  C2280b-46, circuit VLF14 (BU/BN), harness side.
      Fig 12: Measuring Resistance Between Light Sensor C287-A, Circuit VLF14 (BU/BN) And SJB C2280B-46, Circuit VLF14 (BU/BN)
      G06065244Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to  H15.
    • No:  REPAIR circuit VLF14 (BU/BN) for an open. CLEAR the DTCs. REPEAT the self-test.
  12. H12 CHECK FOR VOLTAGE TO THE LIGHT SENSOR USING THE CONNECTOR GROUND 
    • Ignition OFF.
    • On vehicles with automatic temperature control, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and the light sensor C286-4, circuit GD115 (BK/GY), harness side.
      Fig 13: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN) And Light Sensor C286-4, Circuit GD115 (BK/GY)
      G06075646Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the voltage between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and the light sensor C287-B, circuit GD115 (BK/GY), harness side.
      Fig 14: Measuring Voltage Between Light Sensor C287-A, Circuit VLF14 (BU/BN) And Light Sensor C287-B, Circuit GD115 (BK/GY)
      G06099151Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
    • Yes:  INSTALL a new light sensor. REFER to LIGHT SENSOR . CLEAR the DTCs. REPEAT the self-test.
    • No:  REPAIR circuit GD115 (BK/GY) for an open. CLEAR the DTCs. REPEAT the self-test.
  13. H13 CHECK FOR VOLTAGE TO THE LIGHT SENSOR 
    • Ignition OFF.
    • Disconnect: Light Sensor C286 or C287.
    • Ignition ON.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • On vehicles with automatic temperature control, measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 15: Measuring Voltage Between Light Sensor C286-2, Circuit VLF14 (BU/BN) And Ground
      G06065236Courtesy of FORD MOTOR CO.
    • On vehicles with manual temperature control, measure the voltage between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 16: Measuring Voltage Between Light Sensor C287-A, Circuit VLF14 (BU/BN) And Ground
      G06065237Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
    • Yes:  INSTALL a new light sensor. REFER to LIGHT SENSOR . CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to H14  .
  14. H14 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SJB  C2280b.
    • On vehicles with automatic temperature control, measure the resistance between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 17: Measuring Resistance Between Light Sensor C286-2, Circuit VLF14 (BU/BN) And Ground
      G06065249Courtesy of FORD MOTOR CO.
    • On vehicles with manual temperature control, measure the resistance between the light sensor C287-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 18: Measuring Resistance Between Light Sensor C287-A, Circuit VLF14 (BU/BN) And Ground
      G06065250Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes:  GO to H15  .
    • No:  REPAIR circuit VLF14 (BU/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  15. H15 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? 
    • Yes:  INSTALL a new SJB  . REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.
    • 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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