LIGHTING SYSTEM Headlight (HI-BEAM) Circuit

DESCRIPTION

The main body ECU receives a headlight hi switch information signal from the light control switch, and illuminates the headlight high beam.

WIRING DIAGRAM

B001Y2ZE02
B001VL2E02
B001Y0ZE02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. READ VALUE USING GTS (HEAD LIGHT SW [HEAD])


    1. Operate the GTS according to the display and select the Data List Click here.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Head Light SW (Head) Headlight switch signal / ON or OFF

      ON: Headlight switch (Head) on

      OFF: Headlight switch (Head) off

      		 -
      OK
      Normal conditions listed above are displayed.

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. PERFORM ACTIVE TEST USING GTS (HEAD HI RELAY)


    1. Using the GTS, perform the Active Test Click here.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Head Light Hi Headlight (Hi) ON or OFF -
      OK
      Headlight high beam turns on/turns off.
      Result
      Result Proceed to
      Headlights (Both high beams turn on) (for LHD) A
      Headlights (Both high beams turn on) (for RHD) B
      Headlights (Neither high beam turns on) C
      Headlight on one side (High beam does not turn on) D
      Headlight on one side (High beam does not turn on) [for Halogen Headlight] E

    A

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

    B

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

    D

    CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP HI OR H-LP RH] - HEADLIGHT ASSEMBLY Click here

    E

    REPLACE HEADLIGHT ASSEMBLY Click here

    C

  3. INSPECT HEADLIGHT RELAY (H-LP HI OR H-LP RH)


    1. Remove the H-LP HI or H-LP RH relay from the engine room relay block, junction block.

    2. Inspect the H-LP HI or H-LP RH relay Click here.


    NG

    REPLACE HEADLIGHT RELAY (H-LP HI OR H-LP RH)

    OK

  4. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY [H-LP HI OR H-LP RH])


    1. B001Z9PE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Relay [H-LP HI or H-LP RH])

      Remove the H-LP HI or H-LP RH relay from the engine room relay block, junction block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Headlight relay terminal 1- Body ground Always 11 to 14 V
      Headlight relay terminal 3 - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP HI OR H-LP RH] - HEADLIGHT ASSEMBLY


    1. Remove the H-LP HI or H-LP RH relay from the engine room relay block, junction block.

    2. Disconnect the A65*1 or A68*2 headlight 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
      Headlight relay terminal 5 - A65-3 (HI) Always Below 1 Ω
      Headlight relay terminal 5 - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      Headlight relay terminal 5 - A68-3 (HI) Always Below 1 Ω
      Headlight relay terminal 5 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEXNETWORK BODY ECU] - HEADLIGHT RELAY [H-LP HI OR H-LP RH]


    1. Remove the H-LP HI or H-LP RH relay from the engine room relay block, junction block.

    2. Remove the cowl side junction block LH.

    3. Disconnect the E118 main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Headlight relay terminal 2 - E118-1 (DIM) Always Below 1 Ω
      E118-1 (DIM) - Body ground Always 10 kΩ or higher
      Result
      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

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP HI OR H-LP RH] - HEADLIGHT ASSEMBLY


    1. Remove the H-LP HI or H-LP RH relay from the engine room relay block, junction block.

    2. Disconnect the A65*1 or A68*2 headlight 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
      Headlight relay terminal 5 - A65-3 (HI) Always Below 1 Ω
      A65-6 (E) - Body ground Always
      Headlight relay terminal 5 - Body ground Always 10 kΩ or higher
      for RH
      Tester Connection Condition Specified Condition
      Headlight relay terminal 5 - A68-3 (HI) Always Below 1 Ω
      A68-6 (E) - Body ground Always
      Headlight relay terminal 5 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT HEADLIGHT ASSEMBLY


    1. for LED Headlight


      1. Remove the headlight assembly Click here.

    2. for Halogen Headlight and LED Headlight


      1. Remove the headlight assembly Click here.

    3. for LED Headlight


      1. Remove the headlight unit from the headlight assembly Click here.

    4. for Halogen Headlight and LED Headlight


      1. Remove the headlight unit from the headlight assembly Click here.

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

      Standard Resistance
      for LED Headlight
      Tester Connection Condition Specified Condition
      A-3 (B) - B-1 Always Below 1 Ω
      A-6 (E) - B-2 Always 10 kΩ or higher
      for Halogen Headlight and LED Headlight
      Tester Connection Condition Specified Condition
      A-3 (B) - B-1 Always Below 1 Ω
      A-6 (E) - B-2 Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LED Headlight) A
      OK (for Halogen Headlight and LED Headlight) B
      NG (for LED Headlight) C
      NG (for Halogen Headlight and LED Headlight) D

    A

    REPLACE HEADLIGHT UNIT Click here

    B

    REPLACE HEADLIGHT UNIT Click here

    C

    REPLACE HEADLIGHT ASSEMBLY Click here

    D

    REPLACE HEADLIGHT ASSEMBLY Click here