AUTOMATIC HIGH BEAM SYSTEM Automatic High Beam Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects auto high beam switch signals.

The automatic high beam system can be turned on and off by operating the auto high beam switch.

WIRING DIAGRAM

B003XV3E05

CAUTION / NOTICE / HINT

Note

If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Auto High Beam Main Switch Auto high beam switch signal ON or OFF

      ON: Auto high beam switch pressed

      OFF: Auto high beam switch not pressed

      		 -
      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

  2. INSPECT AUTO HIGH BEAM SWITCH


    1. Remove the auto high beam switch.

      Click here

    2. Inspect the auto high beam switch.

      Click here

      OK
      Auto high beam switch is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AUTO HIGH BEAM SWITCH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)


    1. Disconnect the K89 auto high beam switch connector.

    2. Disconnect the K1 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
      K89-4 (+B) - K1-23 (AHBI) Always Below 1 Ω
      K89-4 (+B) - Body ground Always 10 kΩ or higher
      K89-1 (E) - Body ground 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