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Home >> Lexus >> 2021 >> NX 300h Luxury >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Automatic High Beam System - Diagnostic Codes & Symptom Tests >> Automatic High Beam System >> Automatic High Beam System does not Operate or Operation Indicator does not Illuminate [05/2019 - 07/2020] >> Procedure

Automatic High Beam System does not Operate or Operation Indicator does not Illuminate [05/2019 - 07/2020]: 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 Whether high temperature malfunction of forward recognition camera exists or not Not High Temperature or High Temperature Not High Temperature: Approximately 65°C (149°F) or less
      High Temperature: Approximately 65°C (149°F) or higher      		 If this item is "High Temperature", the automatic high beam system will be temporarily unavailable. If this does not improve even if the inside of the vehicle is left cooled for at least 10 minutes, the forward recognition camera may be malfunctioning.
      HINT: 
      In summertime, the windshield glass may reach 100°C (212°F) or higher

      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.
      • Turn the power switch on (IG).
      • Turn the light control switch to the Auto or Head position.
      • Turn the headlight dimmer switch to the High position.
      • Turn the combination switch assembly (automatic high beam main switch) on.

      OK

      Automatic high beam indicator light illuminates.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM 
    1. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [05/2019 - ]

      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.

        GTY770871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Forward Recognition Camera (Automatic High Beam Sensor)
        *2 Work Light or Equivalent
        *a 100 mm (3.94 in.) or less

        Body Electrical > Main Body > Data List 

        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Auto H Beam STS0 Automatic high beam sensor state past 0 Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err Condition can be displayed -

        Body Electrical > Main Body > Data List 

        Tester Display
        Auto H Beam STS0

        OK

        The Data List value displays "Daytime".

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [05/2019 - ] 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM 
    1. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [05/2019 - ]

      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.
        GTY752756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Cardboard or Equivalent Object
        *a 150 mm (5.91 in.) or higher
        *b 3 mm (0.118 in.) or higher

        Body Electrical > Main Body > Data List 

        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Auto H Beam STS0 Automatic high beam sensor state past 0 Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err Condition can be displayed -

        Body Electrical > Main Body > Data List 

        Tester Display
        Auto H Beam STS0

        OK

        The Data List value displays "Speed".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2019 - 10/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2019 - 07/2020] 

    Result: 

    NG 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [05/2019 - ] 

  5. READ VALUE USING TECHSTREAM 
    1. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [05/2019 - ]

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Auto High Beam Main Switch Combination switch assembly (automatic high beam main switch) signal OFF or ON OFF: Combination switch assembly (automatic high beam main switch) off
      ON: Combination switch assembly (automatic high beam main switch) on      		 -

      Body Electrical > Main Body > Data List 

      Tester Display
      Auto High Beam Main Switch

      OK

      Normal condition listed above is displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  6

  6. READ VALUE USING TECHSTREAM 
    1. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [05/2019 - ]

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Auto H Beam STS0 Automatic high beam sensor state past 0 Undetec, CAM NA, No sens, Hlight, Taillgt, Speed, Daytime, Village, Malfunc, Delay, Aim Lmt, SAE Mod, Undefin or LIN Err Condition can be displayed -

      Body Electrical > Main Body > Data List 

      Tester Display
      Auto H Beam STS0

      OK

      The Data List value displays "Daytime" or "Speed".

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [05/2019 - ] 

    Result: 

    OK 

    See step  7

  7. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Perform the Active Test according to the display on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [05/2019 - ]

      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 -

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Automatic High Beam Indicator

      OK

      Automatic high beam indicator light illuminates.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [05/2019 - ] 

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [09/2017 - ] 

  8. INSPECT COMBINATION SWITCH ASSEMBLY (AUTOMATIC HIGH BEAM MAIN SWITCH) 
    1. Remove the combination switch assembly (automatic high beam main switch).

      Refer to REMOVAL [10/2014 - ]

    2. Inspect the combination switch assembly (automatic high beam main switch).

      Refer to INSPECTION [10/2014 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE COMBINATION SWITCH ASSEMBLY (AUTOMATIC HIGH BEAM MAIN SWITCH). Refer to  REMOVAL [10/2014 - ] 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY [AUTOMATIC HIGH BEAM MAIN SWITCH] - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND) 
    1. Disconnect the I33 combination switch assembly (automatic high beam main switch) connector.
    2. Disconnect the I47 main 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
      I33-1 (+B) - I47-23 (AHBI) Always Below 1 Ω
      I33-10 (E) - Body ground Always Below 1 Ω
      I33-1 (+B) or I47-23 (AHBI) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [05/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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