LIGHTING SYSTEM Daytime Running Light Relay Circuit

DESCRIPTION

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

The system illuminates the high-intensity LED parking lights (high-intensity circuit).

WIRING DIAGRAM

A003WIPE02

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Check that the daytime running lights operate.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Daytime Running Light Daytime running lights ON/OFF -
      OK
      Daytime running lights illuminate. (LED parking lights illuminate on high-intensity (bright) setting.)

    NG

    INSPECT DRL RELAY Click here

    OK

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

  2. INSPECT DRL RELAY


    1. Remove the DRL relay from the engine room relay block.

    2. A003ZUHE01
      Text in Illustration
      *a

      Component without harness connected

      (DRL Relay)

      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 DRL RELAY

    OK

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


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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Relay Terminal 1 - Body ground Power switch off 11 to 14 V
      Relay Terminal 3 - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the A47*1 or A9*2 headlight assembly LH connector.

    2. Disconnect the A48*1 or A38*2 headlight assembly RH connector.

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


      • *1: for LED headlight

      • *2: except LED headlight

      Standard Resistance
      for LED Headlight :
      Tester Connection Condition Specified Condition
      Relay Terminal 5 - A47-4 (B) Always Below 1 Ω
      Relay Terminal 5 - A48-4 (B) Always Below 1 Ω
      Relay Terminal 5 - Body ground Always 10 kΩ or higher
      except LED Headlight :
      Tester Connection Condition Specified Condition
      Relay Terminal 5 - A9-1 (B) Always Below 1 Ω
      Relay Terminal 5 - A38-1 (B) Always Below 1 Ω
      Relay Terminal 5 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the H16 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay Terminal 2 - H16-15 (DRL) Always Below 1 Ω
      Relay Terminal 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here