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AUTOMATIC HIGH BEAM SYSTEM Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

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DTC Code DTC Name
  Automatic High Beam System does not Operate or Operation Indicator does not Illuminate
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DESCRIPTION

The main body ECU (multiplex network body ECU) controls the automatic high beam system based on signals received from the forward recognition camera.

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.

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PROCEDURE


  1. Click here

    CHECK AUTOMATIC HIGH BEAM INDICATOR LIGHT


    1. Check the operation of the automatic high beam indicator light.


      1. Turn the engine switch on (IG).

      2. Turn the light control switch to the AUTO or head position.

      3. Cover the automatic light control sensor to turn the low beam headlights on.

      4. Move the dimmer switch to the high position.

      5. Press the auto high beam switch.

      OK
      Automatic high beam indicator light illuminates.
      Result
      Proceed to
      OK
      NG

  2. *1 Forward Recognition Camera (Automatic High Beam Sensor) *2 Work Light or Equivalent *a 100 mm or less
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    READ VALUE USING GTS


    1. Shine a light on the automatic high beam sensor.

      Tip:

      If troubleshooting is being performed in a bright area, such as outside on a sunny day, it will not be necessary to perform this step.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Main Body / Data List.

    6. Read the Data List according to the display on the GTS.


      1. Body Electrical > Main Body > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Auto H Beam STS0 Automatic high beam sensor current state Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err Condition can be displayed -



      1. Body Electrical > Main Body > Data List
        Tester Display
        Auto H Beam STS0




      OK
      "Daytime" is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

  3. *1 Cardboard or Equivalent Object *a 150 mm or more *b 3 mm or more
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    READ VALUE USING GTS


    1. Cover the automatic high beam sensor with an opaque object, such as cardboard.

      Note:

      • Make sure that there is no clearance between the cardboard or equivalent object and the area of the windshield glass in front of the automatic high beam sensor.

      • If there is any clearance, light may shine on the automatic high beam sensor and the value of the Data List will not change.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Main Body / Data List.

    6. Read the Data List according to the display on the GTS.

      Tip:

      As it may take time for the values in the Data List to change, wait at least 10 seconds before reading the Data List.


      1. Body Electrical > Main Body > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Auto H Beam STS0 Automatic high beam sensor current state Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err Condition can be displayed -



      1. Body Electrical > Main Body > Data List
        Tester Display
        Auto H Beam STS0




      OK
      "Speed" is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

  4. Click here

    READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.


      1. Body Electrical > Main Body > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Auto High Beam Main Switch Auto high beam switch signal OFF or ON

        OFF: Auto high beam switch not pressed

        ON: Auto high beam switch pressed

        		 -



      1. Body Electrical > Main Body > Data List
        Tester Display
        Auto High Beam Main Switch




      OK
      Normal conditions listed above are displayed.
      Result
      Proceed to
      OK
      NG

  5. Click here

    READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.


      1. Body Electrical > Main Body > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Auto H Beam STS0 Automatic high beam sensor current state Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err Condition can be displayed -



      1. Body Electrical > Main Body > Data List
        Tester Display
        Auto H Beam STS0




      OK
      "Daytime" or "Speed" is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

  6. Click here

    PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      1. Body Electrical > Combination Meter > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Automatic High Beam Indicator Automatic high beam indicator light OFF or ON -



      1. Body Electrical > Combination Meter > Active Test
        Tester Display
        Automatic High Beam Indicator




      OK
      The automatic high beam indicator illuminates and turns off.
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)Click here

    • NG

      REPLACE COMBINATION METER ASSEMBLYClick here

  7. Click here

    INSPECT AUTO HIGH BEAM SWITCH


    1. Remove the auto high beam switch.

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    2. Inspect the auto high beam switch.

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      Result
      Proceed to
      OK
      NG

  8. Click here

    CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      O85-4 (+B) - O1-23 (AHBI) Always Below 1 Ω
      O85-4 (+B) or O1-23 (AHBI) - Body ground Always 10 kΩ or higher
      O85-1 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR