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Home >> Lexus >> 2022 >> UX 200 Base >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (Exterior) (Diagnostic Codes (2 Of 2) & Circuit Tests) >> Lighting System >> Headlight Dimmer Switch Circuit [10/2019 - 10/2020] >> Procedure

Headlight Dimmer Switch Circuit [10/2019 - 10/2020]: Procedure

  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 position signal OFF or ON OFF: Light control switch not in DRL OFF position
      ON: Light control switch in DRL OFF position      		 -
      Auto Light Switch Light control switch AUTO position signal OFF or ON OFF: Light control switch not in AUTO position
      ON: Light control switch in AUTO position      		 -
      Head Light Switch (Tail) Light control switch tail position signal OFF or ON OFF: Light control switch in neither tail nor head position
      ON: Light control switch in tail or head 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 high flash position (pass) signal OFF or ON OFF: Dimmer switch not in high flash position
      ON: Dimmer switch in high flash position      		 -
      Front Fog Light Switch Front fog light switch signal* OFF or ON OFF: Front fog light switch off
      ON: Front fog light switch on      		 -
      1. *: 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  5

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM 
    1. Enter the following menus: Body Electrical / Main Body / Data List.
    2. Enter the following menus: Chassis / Steering Angle Sensor / Data List.
    3. 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 [10/2019 - 10/2020] 

    Result: 

    B 

    REPLACE STEERING SENSOR. Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    D 

    See step  5

    Result: 

    C 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (STEERING SENSOR - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU]) 
    1. Disconnect the F53 steering sensor connector.
    2. Disconnect the F40 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
      F53-7 (HEAD) - F40-16 (HEAD) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK STEERING SENSOR 
    1. Temporarily replace the steering sensor with a new or normally functioning one.

      Refer to REMOVAL [10/2018 - 07/2022]

    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    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.

      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      		 -

      Body Electrical > Main Body > Data List 

      Tester Display
      Head Light SW (Head)

      OK

      Normal conditions listed above are displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (STEERING SENSOR WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2018 - 07/2022] 

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

      Refer to REMOVAL [10/2018 - ]

    2. Inspect the turn signal switch.

      Refer to INSPECTION [10/2018 - 10/2020]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE TURN SIGNAL SWITCH. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    OK 

    See step  6

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

      Refer to REMOVAL [10/2018 - 07/2022]

    2. Inspect the steering wheel switch housing.

      Refer to INSPECTION [10/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STEERING WHEEL SWITCH HOUSING. Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (STEERING SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the F53 steering sensor connector.
    2. Disconnect the F40 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
      F53-7 (HEAD) or F40-16 (HEAD) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. READ VALUE USING TECHSTREAM 
    1. Disconnect the F40 main body ECU (multiplex network body ECU) connector.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Enter the following menus: Chassis / Steering Angle Sensor / Data List.
    6. 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      		 -

      Chassis > Steering Angle Sensor > Data List 

      Tester Display
      Head Light Switch (Head)

      OK

      Normal conditions listed above are displayed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    NG 

    REPLACE STEERING SENSOR. Refer to  REMOVAL [10/2018 - 07/2022] 

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