LIGHTING SYSTEM(w/ Automatic Headlight Beam Level Control System) Headlight Dimmer Switch Circuit

DESCRIPTION

The steering sensor receives the following switch information:


WIRING DIAGRAM


  1. for LHD

    B0070TDE01
    B0071AOE01

  2. for RHD

    B006ZQBE01
    B0071AOE02

CAUTION / NOTICE / HINT

Note


  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*1

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*2


    • *1: w/ Door Control Battery

    • *2: w/ Smart Entry and Start System

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / Steering Angle Sensor / Data List.

    5. Read the Data List according to the display on the GTS.


      Chassis > Steering Angle Sensor > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      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

      		 -
      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

      		 -
      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

      		 w/ Front Fog Light
      Rear Fog Light/Bad Weather Switch Rear fog light switch signal OFF or ON

      OFF: Rear fog light switch off

      ON: Rear fog light switch on

      		 w/ Rear Fog Light

      Chassis > Steering Angle Sensor > Data List
      Tester Display
      Auto Light Switch
      Head Light Switch (Tail)
      Head Light Switch (Head)
      High Beam Main Switch
      Passing Light Switch
      Front Fog Light Switch
      Rear Fog Light/Bad Weather Switch
      OK
      Normal conditions listed above are displayed.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT TURN SIGNAL SWITCH Click here

    OK

  2. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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.


      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

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  3. INSPECT STEERING SENSOR

    B006YYHC08
    *a

    Component without harness connected

    (Steering Sensor)

    		 - -

    1. Remove the steering sensor.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K71-7 (HEAD) - z6-4 (H) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STEERING SENSOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (STEERING SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the K52 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K71-7 (HEAD) - K52-16 (HEAD) Always Below 1 Ω
      K71-7 (HEAD) or K52-16 (HEAD) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT TURN SIGNAL SWITCH


    1. Remove the turn signal switch.

      Click here

    2. Inspect the turn signal switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TURN SIGNAL SWITCH Click here

    OK

  6. INSPECT STEERING WHEEL SWITCH HOUSING


    1. Remove the steering wheel switch housing.

      Click here

    2. Inspect the steering wheel switch housing.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEERING SENSOR Click here

    NG

    REPLACE STEERING WHEEL SWITCH HOUSING Click here