LIGHTING SYSTEM HI-beam Headlight does not Illuminate

DESCRIPTION

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

WIRING DIAGRAM

A01ERP5E01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (HEADLIGHT DIMMER SWITCH)


    1. Using the intelligent tester, read the Data List Click here.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Head Light SW (HEAD) Headlight switch signal (Head) /ON or OFF

      ON: Headlight switch (Head) on

      OFF: Headlight switch off

      		 -
      OK
      When the headlight dimmer switch operation is performed, the result will be the same as above.

    NG

    INSPECT HEADLIGHT DIMMER SWITCH Click here

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEADLIGHT)


    1. Using the intelligent tester, perform the Active Test Click here.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Head Light Hi Headlight (Hi) OFF/ON -
      OK
      Headlight hi beam turns on/off.

    NG

    CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - BATTERY AND BODY GROUND) Click here

    OK

    REPLACE MAIN BODY ECU

  3. INSPECT HEADLIGHT DIMMER SWITCH


    1. for LHD


      1. Remove the headlight dimmer switch Click here.

        A01EQX0E02

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) head Below 1 Ω
        20 (H) - 12 (EL)
        17 (HF) - 12 (EL) Headlight dimmer switch (Light control switch) flash
        11 (HU) - 12 (EL)
        11 (HU) - 12 (EL) Headlight dimmer switch (Light control switch) high
        18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) off 10 kΩ or higher
        20 (H) - 12 (EL)

    2. for RHD


      1. Remove the headlight dimmer switch Click here.

        A01ER6LE04

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        13 (T) - 19 (EL) Headlight dimmer switch (Light control switch) head Below 1 Ω
        11 (H) - 19 (EL)
        14 (HF) - 19 (EL) Headlight dimmer switch (Light control switch) flash
        20 (HU) - 19 (EL)
        20 (HU) - 19 (EL) Headlight dimmer switch (Light control switch) high
        13 (T) - 19 (EL) Headlight dimmer switch (Light control switch) off 10 kΩ or higher
        11 (H) - 19 (EL)
        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    B

    REPLACE HEADLIGHT DIMMER SWITCH Click here

    C

    REPLACE HEADLIGHT DIMMER SWITCH Click here

    A

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND)

    A01ENMZE08

    1. Disconnect the E14 switch connector.

    2. Disconnect the E1, E2 and 2D ECU connectors.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      E2-17 (HEAD) - E14-20 (H) Always Below 1 Ω
      E1-23 (TAIL) - E14-18 (T)
      E1-13 (HF) - E14-17 (HF)
      2D-13 (HU) - E14-11 (HU)
      E14-12 (EL) - Body ground
      E2-17 (HEAD) - Body ground Always 10 kΩ or higher
      E1-23 (TAIL) - Body ground
      E1-13 (HF) - Body ground
      2D-13 (HU) - Body ground
      for RHD
      Tester Connection Condition Specified Condition
      E2-17 (HEAD) - E14-11 (H) Always Below 1 Ω
      E1-23 (TAIL) - E14-13 (T)
      E1-13 (HF) - E14-14 (HF)
      2D-13 (HU) - E14-20 (HU)
      E14-19 (EL) - Body ground
      E2-17 (HEAD) - Body ground Always 10 kΩ or higher
      E1-23 (TAIL) - Body ground
      E1-13 (HF) - Body ground
      2D-13 (HU) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU

  5. CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - BATTERY AND BODY GROUND)


    1. A01EOZ4E02

      Remove the running light relay from the engine room relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Running light relay terminal 6 (+B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Running light relay terminal 3 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - MAIN BODY ECU)


    1. Remove the running light relay from the engine room relay block.

      A01ENGVE02

    2. Disconnect the E2 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Running light relay terminal 4 (H) - E2-15 (DIM) Always Below 1 Ω
      Running light relay terminal 4 (H) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - RUNNING LIGHT RELAY AND BODY GROUND)


    1. Remove the running light relay from the engine room relay block.

      A01EP2HE03

    2. Disconnect the A40*1 or A46*2 light connector.


      • *1: for LH

      • *2: for RH

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

      Standard Resistance
      for LH
      Tester Connection Condition Specified Condition
      Running light relay terminal 5 (HLOL) - A40-3 (HI) Always Below 1 Ω
      A40-2 (E) - Body ground Always Below 1 Ω
      A40-3 (HI) - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      Running light relay terminal 1 (HLOR) - A46-3 (HI) Always Below 1 Ω
      A46-2 (E) - Body ground Always Below 1 Ω
      A46-3 (HI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK RUNNING LIGHT RELAY


    1. Temporarily replace the running light relay with a new or normally functioning one.

    2. Check that the high beam headlights.

      OK
      High beam headlights turn on.

    NG

    REPLACE MAIN BODY ECU

    OK

    END (RUNNING LIGHT RELAY WAS DEFECTIVE)