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Pinpoint Test H: The AUTOLAMPS Are On Continuously

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 USE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE SJB SELF-TEST 
    • Using the recorded results from the SJB self-test:
    • Were any DTCs recorded? 

    Yes  : For DTC B1791, GO to  H7.

    For DTC B1472, B1692 or B2498, GO to  H4.

    For all others, REFER to the SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX  for correct diagnosis.

    No  : GO to H2.

  2. H2 CHECK THE SJB HEADLAMP SWITCH PIDs 
    • Enter the following diagnostic mode on the scan tool: SJB Headlamp Switch PIDs.
      • NOTE: Make sure the headlamp switch is correctly lined up (in a detent position) when checking each PID.
    • Monitor the SJB headlamp switch PIDs while moving the headlamp switch through all positions.
    • Do the headlamp switch positions agree with the PIDs? 

    Yes  : GO to  H7.

    No  : GO to H3.

  3. H3 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN (HEADLAMP SWITCH) 
    • Measure the resistance between the headlamp switch C205-1, circuit GD116 (BK/VT), harness side and ground.
      Fig 1: Checking Circuit GD116 (BK/VT) For Open (Headlamp Switch)
      G04682807Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to H4.

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  4. H4 CHECK THE HEADLAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205.
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING .
    • Is the headlamp switch OK? 

    Yes  : GO to H5.

    No  : INSTALL a new headlamp switch. REFER to HEADLAMP SWITCH . CLEAR the DTCs. REPEAT the self-test.

  5. H5 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: SJB C2280d.
    • Measure the resistance between the headlamp switch, harness side and ground as follows:
      HEADLAMP SWITCH CONNECTOR-PIN SPECIFICATION

      Headlamp Switch Connector-Pin Circuit
      C205-9 CLF19 (VT/GN)
      C205-4 CLF23 (WH/VT)
      C205-3 CLS34 (GY)
      C205-8 CLF18 (BU/WH)
    • Are the resistances greater than 10,000 ohms? 

    Yes  : GO to H6.

    No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

  6. H6 CHECK THE HEADLAMP SWITCH INPUT CIRCUITS FOR AN OPEN 
    • Measure the resistance between the headlamp switch, harness side and the SJB, harness side as follows:
      HEADLAMP SWITCH CONNECTOR-PIN CHART

      Headlamp Switch Connector-Pin SJB Connector-Pin Circuit
      C205-9 C2280d-19 CLF19 (VT/GN)
      C205-4 C2280d-30 CLF23 (WH/VT)
      C205-3 C2280d-5 CLS34 (GY)
      C205-8 C2280d-29 CLF18 (BU/WH)
    • Are the resistances less than 5 ohms? 

    Yes  : GO to  H11.

    No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

  7. H7 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN (LIGHT SENSOR) 
    • Key in OFF position.
    • Disconnect: Light Sensor C286.
    • Measure the resistance between the light sensor C286-4, circuit GD116 (BK/VT), harness side and ground.
      Fig 2: Checking Circuit GD116 (BK/VT) For Open (Light Sensor)
      G04682808Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to H8.

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  8. H8 CHECK CIRCUIT VLF14 (BU/BN) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB 2280d.
    • Key in ON position.
    • Measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 3: Checking Circuit VLF14 (BU/BN) For Short To Voltage
      G04682809Courtesy of FORD MOTOR CO.
    • Is any voltage present? 

    Yes  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

    No  : GO to H9.

  9. H9 CHECK CIRCUIT VLF14 (BU/BN) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and the SJB C2280d-13, circuit VLF14 (BU/BN), harness side.
      Fig 4: Checking Circuit VLF14 (BU/BN) For Open
      G04682810Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to H10.

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  10. H10 CHECK FOR VOLTAGE TO THE LIGHT SENSOR 
    • Connect: SJB D2280d.
    • Key in ON position.
    • Place the headlamp switch in the AUTOLAMPS ON position.
    • Measure the voltage between the light sensor C286-2, circuit VLF14 (BU/BN), harness side and ground.
      Fig 5: Checking For Voltage To Light Sensor
      G04682811Courtesy 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 H11.

  11. H11 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • Disconnect all the SJB connectors.
    • Check for:
      • Corrosion
      • 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 CONTROL 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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