AUTOMATIC HIGH BEAM SYSTEM Automatic High Beam Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) detects combination switch assembly signals. The automatic high beam system can be turned on and off by operating the combination switch assembly.

WIRING DIAGRAM

B001B1RE30

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. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Auto High Beam Main Switch combination switch assembly signal / ON or OFF

      ON: Combination switch assembly pressed

      OFF: Combination switch assembly 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 COMBINATION SWITCH ASSEMBLY


    1. Remove the combination switch assembly Click here.

    2. Inspect the combination switch assembly Click here.

      OK
      combination switch assembly is normal.

    NG

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the E117 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the E125 combination switch assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      E125-1 (+B) - E117-23 (AHBI) Always Below 1 Ω
      E125-1 (+B) - Body ground Always 10 kΩ or higher
      E125-10 (E) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      E125-9 (+B) - E117-23 (AHBI) Always Below 1 Ω
      E125-9 (+B) - Body ground Always 10 kΩ or higher
      E125-18 (E) - Body ground Always Below 1 Ω
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

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

    B

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

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR