LIGHTING SYSTEM Automatic High Beam System does not Operate or Operation Indicator does not Illuminate

DESCRIPTION

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

WIRING DIAGRAM

B001MJ3E03

CAUTION / NOTICE / HINT

Note


  • 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.

    Click here

PROCEDURE


  1. CHECK AUTOMATIC HIGH BEAM INDICATOR LIGHT


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


      1. Turn the power 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

    NG

    READ VALUE USING GTS Click here

    OK

  2. READ VALUE USING GTS

    B001MKVC01
    *1

    Forward Recognition Camera

    (Automatic High Beam Sensor)
    *2 Work Light or Equivalent
    *a 100 mm or less

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

      Tech Tips

      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 power 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.

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

    NG

    REPLACE FORWARD RECOGNITION CAMERA Click here

    OK

  3. READ VALUE USING GTS

    B001MOVC01
    *1 Cardboard or Equivalent Object
    *a 150 mm or more
    *b 3 mm or more

    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 power 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.

      Tech Tips

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

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

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE FORWARD RECOGNITION CAMERA Click here

  4. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power 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.

      Main Body
      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

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

    NG

    INSPECT AUTO HIGH BEAM SWITCH Click here

    OK

  5. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power 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.

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

    NG

    REPLACE FORWARD RECOGNITION CAMERA Click here

    OK

  6. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power 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.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Automatic High Beam Indicator Automatic high beam indicator light OFF or ON -
      OK
      The automatic high beam indicator light illuminates and turns off.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  7. INSPECT AUTO HIGH BEAM SWITCH


    1. Remove the auto high beam switch.

      Click here

    2. Inspect the auto high beam switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AUTO HIGH BEAM SWITCH Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)


    1. Disconnect the 2B instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H187-4 (+B) - 2B-14 Always Below 1 Ω
      H187-4 (+B) or 2B-14 - Body ground Always 10 kΩ or higher
      H187-1 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    B001LG2C02
    *a

    Component without harness connected

    (Instrument Panel Junction Block Assembly)

    		 - -

    1. Remove the instrument panel junction block assembly.

      Click here

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-14 - A-18 (AHBI) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here