LIGHTING SYSTEM Headlight (HI-BEAM) Circuit

DESCRIPTION

The main body ECU receives a signal from the headlight dimmer switch assembly to control the high beam headlights.

WIRING DIAGRAM

A01CD4WE03

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HEADLIGHT


    1. Check the operation of the low beam headlights.

      OK
      Low beam headlights operate normally.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Active Test.

    5. Check the operation.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Head Light (HI) Headlight dimmer relay ON/OFF -
      OK
      Relay operates. (High beam headlights illuminate.)

    NG

    INSPECT HEADLIGHT DIMMER RELAY (DIM) Click here

    OK

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

  3. INSPECT HEADLIGHT DIMMER RELAY (DIM)


    1. A01CFF8E01

      Remove the headlight dimmer relay from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE HEADLIGHT DIMMER RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (H-LP RELAY - HEADLIGHT DIMMER RELAY)


    1. A01CE8FE01

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Headlight dimmer relay terminal 2 - Body ground Light control switch off → HEAD Below 1 V → 11 to 14 V
      Headlight dimmer relay terminal 3 - Body ground Light control switch off → HEAD Below 1 V → 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the 4K main body ECU connector.

      A01CFECE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Headlight dimmer relay terminal 1 - 4K-8 (DRL) Always Below 1 Ω
      4K-8 (DRL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - HEADLIGHT DIMMER RELAY AND BODY GROUND)


    1. A01CEHLE01

      Disconnect the B3 and B12 headlight assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Headlight dimmer relay terminal 5 - B3-1 Always Below 1 Ω
      Headlight dimmer relay terminal 5 - B12-1 Always Below 1 Ω
      B3-1 - Body ground Always 10 kΩ or higher
      B12-1 - Body ground Always 10 kΩ or higher
      B3-2 - Body ground Always Below 1 Ω
      B12-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU Click here