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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 434 (Exterior Lighting System) >> Diagnosis And Testing >> Autolamps >> Pinpoint Tests >> Pinpoint Test H: The Autolamps Are On Continuously >> Pinpoint Test H: The AUTOLAMPS Are On Continuously

Pinpoint Test H: The AUTOLAMPS Are On Continuously

WARNING: This page is about a different car, the 2013 Ford Mustang. 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 
    NOTE: Make sure the headlamp switch is lined up in the correct position when monitoring the PID.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: SJB DataLogger.
    • While placing the headlamp switch in the AUTOLAMPS ON and then OFF position, monitor the SJB headlamp switch PID (HDLMP_AUT_CKT).
    • Does the PID indicate ON with the headlamp switch in the AUTOLAMPS ON position and OFF when the headlamp switch is in the OFF position? 
    • Yes  : GO to  H5.
    • No  : GO to H2.
  2. H2 CHECK FOR A VOLTAGE SIGNAL TO THE HEADLAMP SWITCH 
    • Ignition OFF.
    • Disconnect: Headlamp Switch C205.
    • Measure the voltage between the headlamp switch C205-4, circuit CLF19 (VT/GN), harness side and ground.
      Fig 1: Measuring Voltage Between Headlamp Switch C205-4, Circuit CLF19 (VT/GN) And Ground
      G06258162Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 11 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 ON REQUEST INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280b.
    • Measure the resistance between the headlamp switch C205-4, circuit CLF19 (VT/GN), harness side and ground.
      Fig 2: Measuring Resistance Between Headlamp Switch C205-4, Circuit CLF19 (VT/GN) And Ground
      G06065234Courtesy 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 ON REQUEST INPUT CIRCUIT FOR AN OPEN 
    • Measure the resistance between the headlamp switch C205-4, circuit CLF19 (VT/GN), harness side and the SJB C2280b-50, circuit CLF19 (VT/GN), harness side.
      Fig 3: Checking Autolamps Request Input Circuit For Open
      G06065235Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to  H16.
    • No  : REPAIR circuit CLF19 (VT/GN) for an open. CLEAR the DTCs. REPEAT the self-test.
  5. H5 CHECK THE SJB HEADLAMP SWITCH PIDs 
    NOTE: Make sure the headlamp switch is lined up in the correct position when monitoring the PIDs.
    NOTE: Only one PID should indicate ON at each headlamp switch position.
    • Enter the following diagnostic mode on the scan tool: SJB Data Logger.
    • While moving the headlamp switch through all positions, monitor the SJB headlamp switch input PIDs (HDLMP_OFF_CKT, HDLMP_PRK_CKT, HDLMP_ON_CKT).
    • Do the headlamp switch positions agree with the PIDs (with only one PID indicating ON in each position)? 
  6. H6 USE THE RECORDED DTCs FROM THE SJB SELF-TEST 
    • Check the recorded results from the SJB self-test.
    • Was DTC B2008, B1791 or B1793 recorded? 
    • Yes  : For DTC B2008, GO to  H8.

      For DTC B1791, GO to  H10.

      For DTC B1793, GO to  H14.

    • No  : GO to H7.
  7. H7 CHECK FOR VOLTAGE TO THE LIGHT SENSOR (NO DTCs) 
    • Ignition OFF.
    • Disconnect: Light Sensor C2360 or C286.
    • Ignition ON.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • For vehicles with automatic temperature control, measure the voltage between the light sensor C2360-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 4: Measuring Voltage Between Light Sensor C2360-2, Circuit VLF14 (BU/BN) And Ground
      G06065236Courtesy of FORD MOTOR CO.
    • For vehicles with manual temperature control, measure the voltage between the light sensor C286-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 5: Measuring Voltage Between Light Sensor C286-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  H16.
  8. H8 CHECK THE WINDSHIELD WIPER MOTOR 
    • Disconnect: Windshield Wiper Motor C125.
    • 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 H9.
    • No  : INSTALL a new windshield wiper motor. REFER to WIPERS AND WASHERS . TEST the system for normal operation.
  9. H9 CHECK THE WIPERS ON INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SJB C2280f.
    • Measure the resistance between the windshield wiper motor C125-2, circuit CRW01 (WH), harness side and ground.
      Fig 6: Measuring Resistance Between Windshield Wiper Motor C125-2, Circuit CRW01 (WH) And Ground
      G07811314Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to  H16.
    • No  : REPAIR circuit CRW01 (WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  10. H10 CHECK FOR VOLTAGE TO THE LIGHT SENSOR (DTC B1791) 
    • Ignition OFF.
    • Disconnect: Light Sensor C2360 or C286.
    • Ignition ON.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • For vehicles with automatic temperature control, measure the voltage between the light sensor C2360-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 7: Measuring Voltage Between Light Sensor C2360-2, Circuit VLF14 (BU/BN)
      G06065236Courtesy of FORD MOTOR CO.
    • For vehicles with manual temperature control, measure the voltage between the light sensor C286-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 8: Measuring Voltage Between Light Sensor C286-A, Circuit VLF14 (BU/BN) And Ground
      G06065237Courtesy of FORD MOTOR CO.
    • Is the voltage approximately 5 volts? 
    • Yes  : GO to  H13.
    • No  : GO to H11.
  11. H11 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Place the headlamp switch in the OFF position.
    • Disconnect: SJB C2280b.
    • Ignition ON.
    • On vehicles with automatic temperature control, measure the voltage between the light sensor C2360-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 9: Measuring Voltage Between Light Sensor C2360-2, Circuit VLF14 (BU/BN) And Ground
      G06065236Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the voltage between the light sensor C286-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 10: Measuring Voltage Between Light Sensor C286-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 H12.
  12. H12 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • On vehicles with automatic temperature control, measure the resistance between the light sensor C2360-2, circuit VLF14 (BU/BN), harness side and the SJB C2280b-46, circuit VLF14 (BU/BN), harness side.
      Fig 11: Measuring Resistance Between Light Sensor C2360-2, Circuit VLF14 (BU/BN) And SJB C2280B-46
      G06065243Courtesy of FORD MOTOR CO.
    • On vehicles with manual climate control, measure the resistance between the light sensor C286-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 C286-A, Circuit VLF14 (BU/BN) And SJB C2280B-46
      G06065244Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to  H16.
    • No  : REPAIR circuit VLF14 (BU/BN) for an open. CLEAR the DTCs. REPEAT the self-test.
  13. H13 CHECK FOR VOLTAGE TO THE LIGHT SENSOR USING THE CONNECTOR GROUND 
    • For vehicles with automatic temperature control, measure the voltage between the light sensor C2360-2, circuit VLF14 (BU/BN), harness side and the light sensor C2360-4, circuit GD116 (BK/VT), harness side.
      Fig 13: Measuring Voltage Between Light Sensor C2360-2, Circuit VLF14 (BU/BN) And Light Sensor C2360-4
      G06403747Courtesy of FORD MOTOR CO.
    • For vehicles with manual temperature control, measure the voltage between the light sensor C286-A, circuit VLF14 (BU/BN), harness side and the light sensor C286-B, circuit GD116 (BK/VT), harness side.
      Fig 14: Measuring Voltage Between Light Sensor C286-A, Circuit VLF14 (BU/BN), Harness Side And Light Sensor C286-B, Circuit GD116 (BK/VT)
      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 GD116 (BK/VT) for an open. CLEAR the DTCs. REPEAT the self-test.
  14. H14 CHECK FOR VOLTAGE TO THE LIGHT SENSOR (DTC B1793) 
    • Disconnect: Light Sensor C2360 or C286.
    • Ignition ON.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • For vehicles with automatic temperature control, measure the voltage between the light sensor C2360-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 15: Measuring Voltage Between Light Sensor C2360-2, Circuit VLF14 (BU/BN) And Ground
      G06065236Courtesy of FORD MOTOR CO.
    • For vehicles with manual temperature control, measure the voltage between the light sensor C286-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 16: Measuring Voltage Between Light Sensor C286-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.
  15. H15 CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: SJB C2280b.
    • For vehicles with automatic temperature control, measure the resistance between the light sensor C2360-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 17: Measuring Resistance Between Light Sensor C2360-2, Circuit VLF14 (BU/BN) And Ground
      G06065249Courtesy of FORD MOTOR CO.
    • For vehicles with manual temperature control, measure the resistance between the light sensor C286-A, circuit VLF14 (BU/BN), harness side and ground.
      Fig 18: Measuring Resistance Between Light Sensor C286-A, Circuit VLF14 (BU/BN) And Ground
      G06065250Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
    • Yes  : GO to H16.
    • No  : REPAIR circuit VLF14 (BU/BN) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  16. H16 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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