LIGHTING SYSTEM Daytime Running Light Relay Circuit

DESCRIPTION

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

WIRING DIAGRAM

B004ORPE01

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 inspection 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 / Active Test.

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


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

      Body Electrical > HL AutoLeveling > 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 (DAYTIME RUNNING LIGHT RH (FOG LIGHT ASSEMBLY RH) - POWER SOURCE OR BODY GROUND) Click here

    B

  2. CHECK HARNESS AND CONNECTOR (DAYTIME RUNNING LIGHT LH (FOG LIGHT ASSEMBLY LH) - POWER SOURCE OR BODY GROUND)


    1. Disconnect the A26 fog light assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A26-2 (DRL) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A26-1 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - DAYTIME RUNNING LIGHT LH (FOG LIGHT ASSEMBLY LH))


    1. Disconnect the A18 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
      A18-8 (RLD2) - A26-3 (DRLC) Always Below 1 Ω
      A18-8 (RLD2) or A26-3 (DRLC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FOG LIGHT ASSEMBLY LH


    1. Remove the fog light assembly LH.

      Click here

    2. Inspect the fog light assembly LH.

      Click here

      OK
      Daytime running light LH operate normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE FOG LIGHT ASSEMBLY LH Click here

  5. CHECK HARNESS AND CONNECTOR (DAYTIME RUNNING LIGHT RH (FOG LIGHT ASSEMBLY RH) - POWER SOURCE OR BODY GROUND)


    1. Disconnect the A25 fog light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A25-2 (DRL) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A25-1 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - DAYTIME RUNNING LIGHT RH (FOG LIGHT ASSEMBLY RH))


    1. Disconnect the A19 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
      A19-8 (RLD2) - A25-3 (DRLC) Always Below 1 Ω
      A19-8 (RLD2) or A25-3 (DRLC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT FOG LIGHT ASSEMBLY RH


    1. Remove the fog light assembly RH.

      Click here

    2. Inspect the fog light assembly RH.

      Click here

      OK
      Daytime running light RH operate normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE FOG LIGHT ASSEMBLY RH Click here