LIGHTING SYSTEM Headlight Dimmer Switch Circuit

DESCRIPTION

The steering sensor receives the following switch information:


WIRING DIAGRAM

Figure 1. for LH Side Type:

B004T2DE03

Figure 2. for RH Side Type:

B004T2DE04
B004VJTE02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. READ VALUE USING GTS


    1. Using the GTS, read the Data List.

      Click here


      Chassis > Steering Angle Sensor > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Light OFF Switch Light control switch Off position signal OFF or ON

      OFF: Light control switch not in Off position

      ON: Light control switch in Off position

        w/ Light Control Switch Off Position:

      • -


        w/o Light Control Switch Off Position:

      • Although the item is displayed on the GTS, it is not applicable to the vehicle.
      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 Headlight dimmer switch High position signal OFF or ON

      OFF: Headlight dimmer switch not in High position

      ON: Headlight dimmer switch in High position

      		 -
      Passing Light Switch Headlight dimmer switch Flash position signal OFF or ON

      OFF: Headlight dimmer switch not in Flash position

      ON: Headlight dimmer switch in Flash position

      		 -
      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
      Light OFF Switch
      Auto Light Switch
      Head Light Switch (Tail)
      High Beam Main Switch
      Passing Light Switch
      Rear Fog Light/Bad Weather Switch
      OK
      Normal condition listed above are displayed.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT TURN SIGNAL SWITCH Click here

    OK

  2. READ VALUE USING GTS


    1. Using the GTS, read the Data List.

      Click here


      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 condition 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

    A

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

    B

    REPLACE STEERING SENSOR Click here

    D

    INSPECT TURN SIGNAL SWITCH Click here

    C

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - STEERING SENSOR)


    1. Disconnect the G12 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the G29*1 or G30*2 steering sensor connector.


      • *1: w/ VGRS

      • *2: w/o VGRS

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

      Standard Resistance
      w/ VGRS
      Tester Connection Condition Specified Condition
      G12-16 (HEAD) - G29-7 (HEAD) Always Below 1 Ω
      w/o VGRS
      Tester Connection Condition Specified Condition
      G12-16 (HEAD) - G30-7 (HEAD) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. 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

  5. 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

    NG

    REPLACE STEERING WHEEL SWITCH HOUSING Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - STEERING SENSOR)


    1. Disconnect the G12 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the G29*1 or G30*2 steering sensor connector.


      • *1: w/ VGRS

      • *2: w/o VGRS

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

      Standard Resistance
      w/ VGRS
      Tester Connection Condition Specified Condition
      G12-16 (HEAD) or G29-7 (HEAD) - Body ground Always 10 kΩ or higher
      w/o VGRS
      Tester Connection Condition Specified Condition
      G12-16 (HEAD) or G30-7 (HEAD) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEERING SENSOR Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. 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

  8. 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