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The Steering Responsive Headlight Does Not Operate

CAUTION:
  • Before performing diagnosis, check the fuse in this circuit.
  • Initialization is required after replacing the auto headlight beam leveler Control Module.
  • After replacing the headlight assembly, headlight beam adjustment is required.

Wiring diagram: 

G13265080Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK DTC. 
    1. Turn the ignition switch to OFF.
    2. Start the engine.
    3. Using the Subaru Select Monitor, clear the auto headlight beam leveler system memory. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>CLEAR MEMORY MODE .
    4. Use the Subaru Select Monitor and read DTCs. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

      Is the auto headlight beam leveler system DTC displayed? (Current malfunction)

      Yes:  Perform the diagnosis according to DTC. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

      No:  Go to  2.

  2. CHECK DTC. 

    Using the Subaru Select Monitor, read all the DTCs. Refer to LAN SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

    Is a U-code DTC displayed? (Current malfunction)

    Yes:  Perform the inspection according to the diagnosis for LAN system. Refer to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

    No:  Go to  3.

  3. CHECK DTC. 

    Check DTC of VDC.

    Is any DTC related to the vehicle speed and steering angle sensor detected?

    Yes:  Perform the diagnosis according to DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

    No:  Go to  4.

  4. CHECK INITIALIZE FUNCTION. 

    Perform the function check (the initialize function) for the steering responsive headlight. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION>FUNCTION CHECK .

    Do the left and right headlights operate?

    Yes:  Go to  6.

    No

    • Only one side does not operate: Go to  5.
    • Both sides do not operate: Go to  6.
  5. CHECK SWIVEL ACTUATOR POWER SUPPLY. 

    Using the Subaru Select Monitor, display «Left Steering Responsive Headlight Power Supply Failure»«Right Steering Responsive Headlight Power Supply Failure». Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>READ CURRENT DATA .

    Is «Failure» displayed?

    Yes:  Check the battery and fuse. If no fault is found, check the swivel actuator power supply circuit.

    No:  Go to  10.

  6. CHECK REVERSE SIGNAL. 
    1. Using Subaru Select Monitor, display «MT Reverse SW» for MT model, or «Shift Position Signal» for CVT model.
    2. Place the shift in reverse.

      For MT model, is «ON» displayed? For CVT model, is «R» displayed?

      Yes:  For MT model, check the reverse switch or reverse switch harness. Refer to MANUAL TRANSMISSION AND DIFFERENTIAL (6MT) (TY75)>SWITCHES AND HARNESS .

      For CVT model, perform the diagnosis for CVT. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

      When DTC is not stored, check the inhibitor switch or inhibitor switch harness. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>INHIBITOR SWITCH .

      No:  Go to  7.

  7. CHECK SWIVEL ACTUATOR POWER SUPPLY. 

    Using the Subaru Select Monitor, display «Left Steering Responsive Headlight Power Supply Failure»«Right Steering Responsive Headlight Power Supply Failure». Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>READ CURRENT DATA .

    Is «Failure» displayed?

    Yes:  Go to  8.

    No:  Go to  9.

  8. CHECK SWIVEL ACTUATOR POWER SUPPLY CIRCUIT. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the headlight assembly connector.
    3. Turn the ignition switch to ON.
    4. Using a tester, measure the voltage between headlight assembly connector and chassis ground.

      Connector & terminal

      (F126) No. 13 (+) - Chassis ground (-):

      (F125) No. 13 (+) - Chassis ground (-):

      Is the voltage 8 - 16 V?

      Yes:  Go to  9.

      No:  Check the battery and fuse. If no fault is found, check the swivel actuator power supply circuit.

  9. CHECK SRH OPERATION. 
    1. Turn the ignition switch to OFF.
    2. Connect all the disconnected connectors.
    3. Drive the vehicle to verify on which side, LH side or RH side, the SRH improper operation occurred.
      NOTE: At night, drive a curve of steering wheel angle approximately 45 degrees or more with vehicle speed at 40 km/h (25 MPH) or more, or drive a curve of steering wheel angle approximately 80 degrees or more with vehicle speed at 15 km/h (9 MPH) or more to check the SRH operation.

      Is the improper operation occurring on either left or right side only?

      Yes:  Perform «VSC (VDC) Centering Mode». Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDC Control Module & H/U)>ADJUSTMENT .

      No:  If the fault is not fixed even after the process: Go to  10.

  10. PERFORM ACTIVE TEST FOR SWIVEL ACTUATOR. 

    Perform «Right Steering Responsive Headlight»«Left Steering Responsive Headlight» using the Subaru Select Monitor. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>ACTIVE TEST .

    Is the actuator current position value approximately the same as the input value of the actuator control position? (Within 1.2 seconds)

    Yes:  Go to  12.

    No:  When the value is not the same on one side only, replace the headlight assembly of the side where the same value is not achieved. Refer to LIGHTING SYSTEM>HEADLIGHT ASSEMBLY .

    When the value is not the same on both sides, Go to  11.

  11. CHECK AUTO HEADLIGHT BEAM LEVELER Control Module POWER SUPPLY. 
    1. Turn the ignition switch to ON.
    2. Display «Control module voltage» using Subaru Select Monitor. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>READ CURRENT DATA .

      Is the voltage 8 - 16 V?

      Yes:  Replace the auto headlight beam leveler Control Module. Refer to LIGHTING SYSTEM>AUTO HEADLIGHT BEAM LEVELER CONTROL MODULE .

      No:  Check the battery and fuse. If no fault is found, check the auto headlight beam leveler Control Module power supply circuit.

  12. DRIVING CHECK. 

    Perform the road test to make sure there is no yawing.

    Is it yawing?

    Yes:  Check the vehicle alignment. Refer to FRONT SUSPENSION>WHEEL ALIGNMENT .

    No:  The circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

    NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
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