LIGHTING SYSTEM Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU (instrument panel junction block assembly) controls the daytime running lights.

WIRING DIAGRAM

A004RUEE05

CAUTION / NOTICE / HINT

Note

As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure.

Tech Tips

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (DAYTIME RUNNING LIGHT)


    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 / Daytime Running Light.

    5. Check that the daytime running light turns on/off.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Daytime Running Light DRL illumination operation ON/OFF -
      OK
      Daytime running light turns on/off.

    OK

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

    NG

  2. INSPECT DRL RELAY

    A004U5XE03

    1. Remove the DRL relay from the No. 2 relay 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 DRL RELAY

    OK

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

    A004P6VE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to DRL Relay)

    1. Remove the DRL relay from the No. 2 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      DRL relay terminal 1 - Body ground Always 11 to 14 V
      DRL relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (DRL RELAY - MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY])


    1. Remove the DRL relay from the No. 2 relay block.

    2. Disconnect the D79*1 or D81*2 main body ECU (instrument panel junction block assembly) connector.


      • *1: for LHD (w/o Seat Position Memory) and RHD (w/o Theft Deterrent System)

      • *2: for LHD (w/ Seat Position Memory) and RHD (w/ Theft Deterrent System)

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

      Standard Resistance
      for LHD (w/o Seat Position Memory) and RHD (w/o Theft Deterrent System)
      Tester Connection Condition Specified Condition
      DRL relay terminal 2 - D79-3 (DRLE) Always Below 1 Ω
      DRL relay terminal 2 - Body ground Always 10 kΩ or higher
      for LHD (w/ Seat Position Memory) and RHD (w/ Theft Deterrent System)
      Tester Connection Condition Specified Condition
      DRL relay terminal 2 - D81-14 (DRLE) Always Below 1 Ω
      DRL relay terminal 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the DRL relay from the No. 2 relay block.

    2. Disconnect the A71 headlight assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      DRL relay terminal 3 - A71-5 (B) Always Below 1 Ω
      DRL relay terminal 3 - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR