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Headlight Dimmer Switch Circuit [10/2023 - 11/2024]: Procedure

WARNING: This page is about a different car, the 2025 Toyota RAV4, 2024 Toyota RAV4, 2023 Toyota RAV4, and 2022 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / Steering Angle Sensor / Data List.
    5. Read the Data List according to the display on the Techstream.

      Chassis > Steering Angle Sensor > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Light OFF Switch Light control switch DRL OFF*1 or OFF*2 position signal OFF or ON OFF: Light control switch not in DRL OFF*1 or OFF*2 position
      ON: Light control switch in DRL OFF*1 or OFF*2 position      		 -
      Auto Light Switch Light control switch AUTO*3 or DRL*4 position signal OFF or ON OFF: Light control switch not in AUTO*3 or DRL*4 position
      ON: Light control switch in AUTO*3 or DRL*4 position      		 -
      Head Light Switch (Tail) Light control switch TAIL position signal OFF or ON OFF: Light control switch not in TAIL position
      ON: Light control switch in TAIL position      		 -
      High Beam Main Switch Dimmer switch High position signal OFF or ON OFF: Dimmer switch not in High position
      ON: Dimmer switch in High position      		 -
      Passing Light Switch Dimmer switch Flash position (pass) signal OFF or ON OFF: Dimmer switch not in Flash position
      ON: Dimmer switch in Flash position      		 -
      Front Fog Light Switch Fog light switch (front position) signal*5 OFF or ON OFF: Fog light switch in OFF position
      ON: Fog light switch in Fr position      		 -
      1. *1: w/ DRL OFF Switch
      2. *2: w/ Light Control Switch OFF Position
      3. *3: w/ Automatic Light Control System
      4. *4: w/ DRL Switch
      5. *5: w/ Front Fog Light

      Chassis > Steering Angle Sensor > Data List 

      Tester Display
      Light OFF Switch
      Auto Light Switch
      Head Light Switch (Tail)
      High Beam Main Switch
      Passing Light Switch
      Front Fog Light Switch

      OK

      Normal conditions listed above are displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  2

  2. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      Type A A
      Type B B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus:
      1. Chassis / Steering Angle Sensor / Data List.
      2. Body Electrical / Main Body / Data List.
    5. Read the Data List according to the display on the Techstream.

      Chassis > Steering Angle Sensor > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Head Light Switch (Head) Light control switch HEAD position signal OFF or ON OFF: Light control switch not in HEAD position
      ON: Light control switch in HEAD position      		 -

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Light Control Switch (HEAD) Light control switch HEAD position signal OFF or ON OFF: Light control switch not in HEAD position
      ON: Light control switch in HEAD position      		 -

      Chassis > Steering Angle Sensor > Data List 

      Tester Display
      Head Light Switch (Head)

      Body Electrical > Main Body > Data List 

      Tester Display
      Light Control Switch (HEAD)

      OK

      Normal conditions listed above are displayed.

      Result

      Result Proceed to
      OK A
      NG ("Steering Angle Sensor" side abnormality) B
      NG ("Main Body" side abnormality) C
      NG ("Steering Angle Sensor" and "Main Body" are abnormality) D

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [12/2021 - ]

    Result: 

    B 

    REPLACE STEERING SENSOR 

    Refer to REMOVAL [10/2023 - ]

    Result: 

    C 

    See step  5

    Result: 

    D 

    See step  6

  4. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus:
      1. Chassis / Steering Angle Sensor / Data List.
      2. Body Electrical / Main Body / Data List.
    5. Read the Data List according to the display on the Techstream.

      Chassis > Steering Angle Sensor > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Head Light Switch (Head) Light control switch HEAD position signal OFF or ON OFF: Light control switch not in HEAD position
      ON: Light control switch in HEAD position      		 -

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Head Light SW (Head) Light control switch HEAD position signal OFF or ON OFF: Light control switch not in HEAD position
      ON: Light control switch in HEAD position      		 -

      Chassis > Steering Angle Sensor > Data List 

      Tester Display
      Head Light Switch (Head)

      Body Electrical > Main Body > Data List 

      Tester Display
      Head Light SW (Head)

      OK

      Normal conditions listed above are displayed.

      Result

      Result Proceed to
      OK A
      NG ("Steering Angle Sensor" side abnormality) B
      NG ("Main Body" side abnormality) C
      NG ("Steering Angle Sensor" and "Main Body" are abnormality) D

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [12/2021 - ]

    Result: 

    B 

    REPLACE STEERING SENSOR 

    Refer to REMOVAL [10/2023 - ]

    Result: 

    D 

    See step  6

    Result: 

    C 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (STEERING SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the G44 main body ECU (multiplex network body ECU) connector.
    2. Disconnect the G68 steering sensor connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G68-7 (HEAD) - G44-16 (HEAD) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

    Refer to REMOVAL [10/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. INSPECT TURN SIGNAL SWITCH 
    1. Remove the turn signal switch.

      Refer to REMOVAL [11/2018 - ]

    2. Inspect the turn signal switch.

      Refer to INSPECTION [11/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TURN SIGNAL SWITCH 

    Refer to REMOVAL [11/2018 - ]

    Result: 

    OK 

    See step  7

  7. INSPECT STEERING WHEEL SWITCH HOUSING 
    1. Remove the steering wheel switch housing.

      Refer to REMOVAL [10/2023 - ]

    2. Inspect the steering wheel switch housing.

      Refer to INSPECTION [11/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STEERING WHEEL SWITCH HOUSING 

    Refer to REMOVAL [10/2023 - ]

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (STEERING SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the G44 main body ECU (multiplex network body ECU) connector.
    2. Disconnect the G68 steering sensor connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G68-7 (HEAD) or G44-16 (HEAD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STEERING SENSOR 

    Refer to REMOVAL [10/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. INSPECT TURN SIGNAL SWITCH 
    1. Remove the turn signal switch.

      Refer to REMOVAL [11/2018 - ]

    2. Inspect the turn signal switch.

      Refer to INSPECTION [11/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TURN SIGNAL SWITCH 

    Refer to REMOVAL [11/2018 - ]

    Result: 

    OK 

    See step  10

  10. INSPECT STEERING WHEEL SWITCH HOUSING 
    1. Remove the steering wheel switch housing.

      Refer to REMOVAL [10/2023 - ]

    2. Inspect the steering wheel switch housing.

      Refer to INSPECTION [11/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STEERING SENSOR 

    Refer to REMOVAL [10/2023 - ]

    Result: 

    NG 

    REPLACE STEERING WHEEL SWITCH HOUSING 

    Refer to REMOVAL [10/2023 - ]

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