LIGHTING SYSTEM Daytime Running Light Circuit

DESCRIPTION

The No. 1 headlight ECU sub-assemblies control the daytime running lights.

WIRING DIAGRAM

A003KLFE01

CAUTION / NOTICE / HINT

Note


  • If the No. 1 headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 headlight ECU sub-assembly LH.

    Click here

  • Check the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling*1 or AHS*2 / Active Test.


      • *1: w/o Adaptive High Beam System

      • *2: w/ Adaptive High Beam System

    5. Perform the Active Test according to the display on the GTS.


      1. w/o Adaptive High Beam System


        Body Electrical > HL AutoLeveling > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Daytime Running Light Daytime running lights OFF or ON -

        Body Electrical > HL AutoLeveling > Active Test
        Tester Display
        Daytime Running Light

      2. w/ Adaptive High Beam System


        Body Electrical > AHS > Active Test
        Tester Display Measurement Item Control Range Diagnostic Note
        Daytime Running Light Daytime running lights OFF or ON -

        Body Electrical > AHS > Active Test
        Tester Display
        Daytime Running Light
      OK
      Daytime running lights illuminate.
      Result
      Result Proceed to
      OK A
      NG (for LH Side) B
      NG (for RH Side) C

    A

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

    C

    CHECK HARNESS AND CONNECTOR (POWER SOURCE - FRONT TURN SIGNAL LIGHT ASSEMBLY RH) Click here

    B

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE - FRONT TURN SIGNAL LIGHT ASSEMBLY LH)


    1. Disconnect the A21 front turn signal light assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A21-3 (DRL) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT ASSEMBLY LH - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A21-5 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - FRONT TURN SIGNAL LIGHT ASSEMBLY LH)


    1. Disconnect the A15 No. 1 headlight ECU sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A15-8 (RLD2) - A21-4 (DRLC) Always Below 1 Ω
      A15-8 (RLD2) or A21-4 (DRLC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT FRONT TURN SIGNAL LIGHT ASSEMBLY LH


    1. Remove the front turn signal light assembly LH.

      Click here

    2. Inspect the front turn signal light assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

    REPLACE FRONT TURN SIGNAL LIGHT ASSEMBLY LH Click here

  6. CHECK HARNESS AND CONNECTOR (POWER SOURCE - FRONT TURN SIGNAL LIGHT ASSEMBLY RH)


    1. Disconnect the A12 front turn signal light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A12-3 (DRL) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (FRONT TURN SIGNAL LIGHT ASSEMBLY RH - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A12-5 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - FRONT TURN SIGNAL LIGHT ASSEMBLY RH)


    1. Disconnect the A16 No. 1 headlight ECU sub-assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A16-8 (RLD2) - A12-4 (DRLC) Always Below 1 Ω
      A16-8 (RLD2) or A12-4 (DRLC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT FRONT TURN SIGNAL LIGHT ASSEMBLY RH


    1. Remove the front turn signal light assembly RH.

      Click here

    2. Inspect the front turn signal light assembly RH.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    NG

    REPLACE FRONT TURN SIGNAL LIGHT ASSEMBLY RH Click here