LIGHTING SYSTEM Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights (high-intensity clearance lights) via the engine room junction block assembly.

WIRING DIAGRAM


  1. for TMC, TMMR Made:

    B000ICAE06

  2. for TMMK Made:

    B000ICAE05

INSPECTION PROCEDURE

PROCEDURE


  1. CONFIRM MODEL

    Result
    Result Proceed to
    for TMC, TMMR Made A
    for TMMK Made B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER Click here

    A

  2. CHECK OPERATION (CLEARANCE LIGHTS)


    1. Check the operation of the clearance lights.

      OK
      The clearance lights operate normally.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

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

    5. Perform the Active Test according to the display on the intelligent tester.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Daytime Running Light Daytime running lights ON/OFF -
      OK
      The daytime running lights illuminate.

    NG

    CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click here

    OK

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

  4. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. Using a voltmeter, check the signal reading of the engine room junction block assembly Click here.

      OK
      Output signal reading is normal.

    NG

    INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY POWER SOURCE AND BODY GROUND)


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

      B000HX2E04
      Text in Illustration
      *a

      Component without engine room junction block assembly

      (Engine Room Relay Block and Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A-1 (BATT) - Body ground Always 11 to 14 V
      B-1 (ALT) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1F-3 (GND1) - Body ground Always Below 1 Ω
      1G-4 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3D main body ECU (multiplex network body ECU) connector.

    2. for TMC, TMMR Made:


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1F-6 (LDRS) - 3D-23 Always Below 1 Ω
        3D-23 - Body ground Always 10 kΩ or higher

    3. for TMMK Made:


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1F-6 (DRLS) - 3D-23 Always Below 1 Ω
        3D-23 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. B000M6KE59
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly 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.

      Standard Resistance
      Tester Connection Condition Specified Condition
      3D-23 - MB-25 (DRL) Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - HEADLIGHT ASSEMBLY OR FRONT TURN SIGNAL LIGHT ASSEMBLY)


    1. for TMC, TMMR Made:


      1. Disconnect the A76 headlight assembly LH connector.

      2. Disconnect the A78 headlight assembly RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1G-8 (LDRL) - A76-1 (B) Always Below 1 Ω
        1G-8 (LDRL) - A78-1 (B) Always Below 1 Ω
        1G-8 (LDRL) - Body ground Always 10 kΩ or higher

    2. for TMMK Made:


      1. Disconnect the A92 front turn signal light assembly LH connector.

      2. Disconnect the A96 front turn signal light assembly RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1G-8 (LDRL) - A92-2 (B) Always Below 1 Ω
        1G-8 (LDRL) - A96-2 (B) Always Below 1 Ω
        1G-8 (LDRL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. Replace the engine room junction block assembly with a new or known good one Click here.

    2. Check that the daytime running lights operate normally.

      OK
      The daytime running lights operate normally.

    NG

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

    OK

    END (ENGINE ROOM JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE)