LIGHTING SYSTEM Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights.

WIRING DIAGRAM


  1. for Hatchback or Wagon

    A012MLYE01

  2. for Sedan

    A012KB5E02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK OPERATION (PARKING LIGHTS)


    1. Check the operation of the parking lights.

      OK
      The parking lights operate normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Check that the daytime running lights illuminate.


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

      Body Electrical > Main Body > Active Test
      Tester Display
      Daytime Running Light
      OK
      The daytime running lights illuminate.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  3. INSPECT DRL RELAY


    1. Remove the DRL relay from the engine room relay block and junction block assembly.

    2. A012MF9N09

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage applied between terminals 1 and 2 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DRL RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (DRL RELAY - BATTERY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1 - Body ground Always 11 to 14 V
      3 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (DRL RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH)


    1. for Hatchback or Wagon


      1. Disconnect the A70*1 or A90*2 headlight assembly LH connector.

      2. Disconnect the A73*1 or A123*2 headlight assembly RH connector.

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

        Standard Resistance
        w/o AFS (Adaptive Front-lighting System)
        Tester Connection Condition Specified Condition
        5 - A70-2 (B) Always Below 1 Ω
        5 - A73-2 (B) Always Below 1 Ω
        5 - Body ground Always 10 kΩ or higher
        Standard Resistance
        w/ AFS (Adaptive Front-lighting System)
        Tester Connection Condition Specified Condition
        5 - A90-2 (B) Always Below 1 Ω
        5 - A123-2 (B) Always Below 1 Ω
        5 - Body ground Always 10 kΩ or higher

        • *1: w/o AFS (Adaptive Front-lighting System)

          *2: w/ AFS (Adaptive Front-lighting System)

    2. for Sedan


      1. Disconnect the A145 headlight assembly LH connector.

      2. Disconnect the A149 headlight assembly RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        5 - A145-4 (B) Always Below 1 Ω
        5 - A149-4 (B) Always Below 1 Ω
        5 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (DRL RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - 3A-53 Always Below 1 Ω
      2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: Click here

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      A012GVXC04
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-53 - MB-26 (DRL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here