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Home >> Toyota >> 2018 >> Mirai >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Automatic High Beam System - Diagnostic Codes & Circuit Tests >> Automatic High Beam System >> Automatic High Beam System does not Operate or Operation Indicator does not Illuminate [11/2018 - ] >> Procedure

Automatic High Beam System does not Operate or Operation Indicator does not Illuminate [11/2018 - ]: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / Front Recognition Camera / Data List.
    5. Read the Data List according to the display on the Techstream.

      Chassis > Front Recognition Camera > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Front Recognition Camera High Temperature 2 Forward recognition camera condition Not High Temperature or High Temperature Not High Temperature: 65°C (149°F) or lower
      High Temperature: 65°C (149°F) or higher      		 When "High Temperature" is displayed, the automatic high beam system is temporarily suspended.

      Chassis > Front Recognition Camera > Data List 

      Tester Display
      Front Recognition Camera High Temperature 2

      OK

      "Not High Temperature" is displayed on the Techstream.

      HINT: 

      If "High Temperature" is displayed, move the vehicle to a cool place and allow the temperature of the forward recognition camera to decrease before continuing with troubleshooting.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    END (TEMPORARY SUSPENSION OF AUTOMATIC HIGH BEAM SYSTEM DUE TO HIGH FORWARD RECOGNITION CAMERA TEMPERATURE) 

    Result: 

    OK 

    See step  2

  2. 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. Press the auto high beam switch.
      3. Turn the light control switch to the AUTO or head position.
      4. Move the headlight dimmer switch assembly (light control switch) to the high position.
      5. Cover the automatic light control sensor to turn the low beam headlights on.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM 
    GTY874178Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *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.

      HINT: 

      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 Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Body Electrical / Main Body / Data List.
    6. Read the Data List according to the display on the Techstream.

      HINT: 

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

      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 If the value of this item is not as specified, the automatic high beam sensor system may be malfunctioning.

      Body Electrical > Main Body > Data List 

      Tester Display
      Auto H Beam STS0

      OK

      "Daytime" is displayed on the Techstream.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM 
    GTY752756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *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 Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Body Electrical / Main Body / Data List.
    6. Read the Data List according to the display on the Techstream.

      HINT: 

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

      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 If the value of this item is not as specified, the automatic high beam sensor system may be malfunctioning.

      Body Electrical > Main Body > Data List 

      Tester Display
      Auto H Beam STS0

      OK

      "Speed" is displayed on the Techstream.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    NG 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [11/2018 - ] 

  5. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Combination Meter / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Combination Meter > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Automatic High Beam Indicator Automatic high beam indicator light ON or OFF -

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Automatic High Beam Indicator

      OK

      Normal conditions listed above are displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  6

  6. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Data List.
    5. Read the Data List according to the display on the Techstream.

      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 Mode, Undefin or LIN Err Condition can be displayed If the value of this item is not as specified, the automatic high beam sensor system may be malfunctioning.

      Body Electrical > Main Body > Data List 

      Tester Display
      Auto H Beam STS0

      OK

      "Daytime" or "Speed" is displayed on the Techstream.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  7

  7. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus:
      1. for Body Electrical / Combination Meter / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Combination Meter > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Automatic High Beam Indicator Automatic high beam indicator light ON or OFF -

      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

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [11/2018 - ] 

  8. INSPECT AUTO HIGH BEAM SWITCH 
    1. Remove the auto high beam switch.

      Refer to REMOVAL [06/2015 - ]

    2. Inspect the auto high beam switch.

      Refer to INSPECTION [06/2015 - ]

      OK

      Combination switch assembly is normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE AUTOMATIC HIGH BEAM SWITCH. Refer to  REMOVAL [06/2015 - ] 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND) 
    1. Disconnect the G11 auto high beam switch connector.
    2. Disconnect the G5 body ECU (multiplex network body ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G11-4 - G5-23 (AHBI) Always Below 1 Ω
      G11-4 - Body ground Always 10 kΩ or higher
      G11-1 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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