LIGHTING SYSTEM Headlight (HI-BEAM) Circuit

DESCRIPTION

The main body ECU (instrument panel junction block assembly) receives light control switch and dimmer switch information signals from the headlight dimmer switch, and illuminates the high beam headlight.

WIRING DIAGRAM

A004SK4E06

CAUTION / NOTICE / HINT

Note

As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure.

Tech Tips

Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (HEAD LIGHT HI)


    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 / Active Test / Head Light Hi.

    5. Check that the headlight (high) turns on/off.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Head Light Hi Headlight (High) ON or OFF -

      Tech Tips

      Perform the inspection with the low beam headlights turned on.

      OK
      Headlight (high) turns on/off.

    OK
    NG
  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY [HIGH] - HEADLIGHT DIMMER RELAY)


    • *1: for LH

    • *2: for RH


    1. for LED Headlight:


      1. A004QFDE02
        Text in Illustration
        *A for LH
        *B for RH
        *a

        Front view of wire harness connector

        (to Headlight Assembly [High])

        Disconnect the A77*1 or A76*2 headlight assembly (high) connector.

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

        Standard Voltage
        for LH
        Tester Connection Switch Condition Specified Condition
        A77-5 (SOL) - Body ground Light control switch HEAD, dimmer switch high 11 to 14 V
        Light control switch HEAD, dimmer switch not high Below 1 V
        for RH
        Tester Connection Switch Condition Specified Condition
        A76-5 (SOL) - Body ground Light control switch HEAD, dimmer switch high 11 to 14 V
        Light control switch HEAD, dimmer switch not high Below 1 V
    2. for Halogen Headlight:


      1. A004T74E02
        Text in Illustration
        *A for LH
        *B for RH
        *a

        Front view of wire harness connector

        (to Headlight Assembly [High])

        Disconnect the A71*1 or A70*2 headlight assembly (high) connector.

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

        Standard Voltage
        for LH
        Tester Connection Switch Condition Specified Condition
        A71-2 (SOL) - Body ground Light control switch HEAD, dimmer switch high 11 to 14 V
        Light control switch HEAD, dimmer switch not high Below 1 V
        for RH
        Tester Connection Switch Condition Specified Condition
        A70-2 (SOL) - Body ground Light control switch HEAD, dimmer switch high 11 to 14 V
        Light control switch HEAD, dimmer switch not high Below 1 V

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT [HIGH] - BODY GROUND)


    • *1: for LH

    • *2: for RH


    1. for LED Headlight:


      1. A004O7GE02
        Text in Illustration
        *A for LH
        *B for RH
        *a

        Front view of wire harness connector

        (to Headlight Assembly [High])

        Disconnect the A77*1 or A76*2 headlight (high) connector.

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

        Standard Resistance
        for LH
        Tester Connection Condition Specified Condition
        A77-7 (E) - Body ground Always Below 1 Ω
        for RH
        Tester Connection Condition Specified Condition
        A76-7 (E) - Body ground Always Below 1 Ω
    2. for Halogen Headlight:


      1. A004Q9BE02
        Text in Illustration
        *A for LH
        *B for RH
        *a

        Front view of wire harness connector

        (to Headlight Assembly [High])

        Disconnect the A71*1 or A70*2 headlight (high) connector.

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

        Standard Resistance
        for LH
        Tester Connection Condition Specified Condition
        A71-3 (E) - Body ground Always Below 1 Ω
        for RH
        Tester Connection Condition Specified Condition
        A70-3 (E) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for LED Headlight) A
      OK (for Halogen Headlight) B
      NG C

    A
    B
    C
  4. INSPECT DIMMER RELAY


    1. A004U5XE03

      Remove the DIMMER relay from the engine room No. 1 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG
    OK
  5. CHECK HARNESS AND CONNECTOR (DIMMER RELAY - BATTERY)

    A004N7SE03
    Text in Illustration
    *a

    Front view of wire harness connector

    (to DIMMER Relay)


    1. Remove the DIMMER relay from the engine room No. 1 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      DIMMER relay terminal 2 - Body ground Always 11 to 14 V
      DIMMER relay terminal 5 - Body ground Always 11 to 14 V

    NG
    OK
  6. CHECK HARNESS AND CONNECTOR (DIMMER RELAY - HEADLIGHT ASSEMBLY [HIGH])


    • *1: for LH

    • *2: for RH


    1. Remove the DIMMER relay from the engine room No. 1 relay block.

    2. for LED Headlight:


      1. Disconnect the A77*1 or A76*2 headlight assembly (high) connector.

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

        Standard Resistance
        for LH
        Tester Connection Condition Specified Condition
        DIMMER relay terminal 3 - A77-5 (SOL) Always Below 1 Ω
        DIMMER relay terminal 3 - Body ground Always 10 kΩ or higher
        for RH
        Tester Connection Condition Specified Condition
        DIMMER relay terminal 3 - A76-5 (SOL) Always Below 1 Ω
        DIMMER relay terminal 3 - Body ground Always 10 kΩ or higher
    3. for Halogen Headlight:


      1. Disconnect the A71*1 or A70*2 headlight assembly (high) connector.

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

        Standard Resistance
        for LH
        Tester Connection Condition Specified Condition
        DIMMER relay terminal 3 - A71-2 (SOL) Always Below 1 Ω
        DIMMER relay terminal 3 - Body ground Always 10 kΩ or higher
        for RH
        Tester Connection Condition Specified Condition
        DIMMER relay terminal 3 - A70-2 (SOL) Always Below 1 Ω
        DIMMER relay terminal 3 - Body ground Always 10 kΩ or higher

    NG
    OK
  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY])


    1. A004N61E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU [Instrument Panel Junction Block Assembly])

      Disconnect the main body ECU (instrument panel junction block assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D80-12 (DIM) - Body ground Always 11 to 14 V

    OK
    NG