LIGHTING SYSTEM Headlight (HI-BEAM) Circuit

DESCRIPTION

The main body ECU receives light control switch and dimmer switch information signals from the headlight dimmer switch, and illuminates the high beam headlight.

WIRING DIAGRAM

A004S6XE02

CAUTION / NOTICE / HINT

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 INTELLIGENT TESTER (HEADLIGHT [HIGH])


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / 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. (for HID Headlight)

      OK
      Headlight (high) turns on/off.

    OK

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

    NG

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

    A004NPEE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Headlight [High])
    *2 for LH
    *3 for RH
    *4 for HID Headlight
    *5 for Halogen Headlight

    1. for HID Headlight:


      1. Disconnect the A58 or A57 headlight (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
        A58-1 (B) - 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
        A57-1 (B) - 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. Disconnect the A58 or A57 headlight (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
        A58-3 (HI) - 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
        A57-3 (HI) - 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

    INSPECT HEADLIGHT DIMMER RELAY (DIMMER) Click here

    OK

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

    A004PFGE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Headlight [High])
    *2 for LH
    *3 for RH
    *4 for HID Headlight
    *5 for Halogen Headlight

    1. for HID Headlight:


      1. Disconnect the A58 or A57 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
        A58-5 (E) - Body ground Always Below 1 Ω
        for RH
        Tester Connection Condition Specified Condition
        A57-5 (E) - Body ground Always Below 1 Ω

    2. for Halogen Headlight:


      1. Disconnect the A58 or A57 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
        A58-4 (E) - Body ground Always Below 1 Ω
        for RH
        Tester Connection Condition Specified Condition
        A57-4 (E) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for HID Headlight) A
      OK (for Halogen Headlight) B
      NG C

    A

    REPLACE HEADLIGHT ASSEMBLY Click here

    B

    REPLACE HEADLIGHT ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. INSPECT HEADLIGHT DIMMER RELAY (DIMMER)

    A004SZVE02
    Text in Illustration
    *1 for HID Headlight:
    *2 for Halogen Headlight:

    1. Remove the headlight 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

    REPLACE HEADLIGHT DIMMER RELAY

    OK

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

    A004RHME01
    Text in Illustration
    *1

    Component without relay connected

    (Engine Room No. 1 Relay Block)
    *2 Headlight Dimmer Relay (DIMMER [for HID Headlight])
    *3 Headlight Dimmer Relay (DIMMER [for Halogen Headlight])

    1. Remove the headlight dimmer relay from the engine room No. 1 relay block.

    2. for HID Headlight:


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

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

    3. for Halogen Headlight:


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

        Standard Voltage
        Tester Connection Condition Specified Condition
        Headlight dimmer relay terminal 1 - Body ground Always 11 to 14 V
        Headlight dimmer relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A004NEBE02
      Text in Illustration
      *1

      Component without relay connected

      (Engine Room No. 1 Relay Block [for HID Headlight])
      *2

      Component without relay connected

      (Engine Room No. 1 Relay Block [for Halogen Headlight])
      *3

      Front view of wire harness connector

      (to Headlight [High])
      *4 for LH
      *5 for RH
      *6 for HID Headlight
      *7 for Halogen Headlight

      Remove the headlight dimmer relay from the engine room No. 1 relay block.

    2. for HID Headlight:


      1. Disconnect the A58 or A57 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
        Headlight dimmer relay terminal 3 - A58-1 (B) Always Below 1 Ω
        Headlight dimmer relay terminal 3 - Body ground Always 10 kΩ or higher
        for RH
        Tester Connection Condition Specified Condition
        Headlight dimmer relay terminal 3 - A57-1 (B) Always Below 1 Ω
        Headlight dimmer relay terminal 3 - Body ground Always 10 kΩ or higher

    3. for Halogen Headlight:


      1. Disconnect the A58 or A57 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
        Headlight dimmer relay terminal 3 - A58-3 (HI) Always Below 1 Ω
        Headlight dimmer relay terminal 3 - Body ground Always 10 kΩ or higher
        for RH
        Tester Connection Condition Specified Condition
        Headlight dimmer relay terminal 3 - A57-3 (HI) Always Below 1 Ω
        Headlight dimmer relay terminal 3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - MAIN BODY ECU)


    1. A004O65E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)

      Disconnect the D80 main body ECU 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

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR