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

A0155E8E01

INSPECTION PROCEDURE

Note

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 (HEAD HI RELAY)


    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) ON or OFF -
      OK
      Headlight high beam turns on/turns off.

    NG

    INSPECT HEADLIGHT RELAY (HEAD HI) Click here

    OK

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

  2. INSPECT HEADLIGHT RELAY (HEAD HI)


    1. A0156JYE01

      Remove the headlight relay from the engine room relay block, junction 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 RELAY (HEAD HI)

    OK

  3. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY [HEAD HI])


    1. A015A9GE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Relay [HEAD HI])

      Remove the headlight 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 2 - Body ground Always 11 to 14 V
      Headlight relay terminal 3 - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [HEAD HI] - MAIN BODY ECU [COWL SIDE JUNCTION BLOCK LH])


    1. Remove the headlight relay from the engine room relay block, junction block.

    2. Disconnect the 2B main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Headlight relay terminal 1 - 2B-16 (DIM) Always Below 1 Ω
      Headlight relay terminal 1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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