LIGHTING 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

A005D1SE28

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.

      Main Body
      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.

    OK

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

    NG

  2. INSPECT INTEGRATION CONTROL ASSEMBLY (AUTO HIGH BEAM SWITCH)


    1. Remove the integration control assembly Click here.

    2. Inspect the auto high beam switch Click here.


    NG

    REPLACE INTEGRATION CONTROL ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (INTEGRATION CONTROL ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)


    1. Disconnect the L190 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
      L177-7 (+B) - L190-17 (AHBI) Always Below 1 Ω
      L177-7 (+B) - Body ground Always 10 kΩ or higher
      L177-2 (E) - Body ground Always Below 1 Ω

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR