LIGHTING SYSTEM, Diagnostic DTC:B124E

DTC Code DTC Name
B124E Flasher Relay Circuit

DESCRIPTION

This DTC is stored when the main body ECU (multiplex network body ECU) detects a malfunction in the turn signal flasher relay circuit.

DTC Code DTC Detection Condition Trouble Area
B124E Malfunction in turn signal flasher relay circuit

  • Turn signal flasher assembly

  • Main body ECU (Multiplex network body ECU)

  • Harness or connector

  • Headlight dimmer switch assembly

WIRING DIAGRAM

A019OJ2E01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK DTC


    1. Operate the turn signal switch to cause the left and right turn signal lights to blink for 3 seconds or more.

    2. Check for DTCs Click here.

      OK
      DTC B124E is not output.

    NG

    READ VALUE USING INTELLIGENT TESTER Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menu items: Body / Main Body / Data List.

    5. Read the display on the intelligent tester.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Right LaneChgFlas Turn Signal Switch Turn signal switch right lane change position signal / ON or OFF

      ON: Turn signal switch in right turn position

      OFF: Turn signal switch not in right turn position

      		 -
      Left LaneChgFlas Turn Signal Switch Turn signal switch left lane change position signal / ON or OFF

      ON: Turn signal switch in left turn position

      OFF: Turn signal switch not in left turn position

      		 -
      R or L TurnFlas Turn Signal Switch (Auto Off) Turn signal switch in full turn position signal / ON or OFF

      ON: Turn signal in full left turn or full right turn position

      OFF: Turn signal switch in off, half left turn or half right turn position

      		 -
      OK
      Normal conditions listed above are displayed.

    NG

    INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY (TURN SIGNAL SWITCH) Click here

    OK

  4. INSPECT TURN SIGNAL FLASHER ASSEMBLY


    1. Remove the turn signal flasher assembly Click here.

    2. Inspect the turn signal flasher assembly Click here.


    NG

    REPLACE TURN SIGNAL FLASHER ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY - BATTERY AND IG SIGNAL CIRCUIT)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F44-4 (B) - Body ground Always 11 to 14 V
      F44-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F44-7 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. A019P07E02
      Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-45 - A-26 (TRNL) Always Below 1 Ω
      2A-45 - Body ground Always 10 kΩ or higher

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - TURN SIGNAL FLASHER ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F14-5 (HZCT) - F44-3 (LL) Always 1 MΩ or higher*1
      Approximately 1 Ω*2
      F14-5 (HZCT) - F44-2 (LR) Always 1 MΩ or higher*1
      Approximately 1 Ω*2
      2A-45 (TRNL) - F44-5 (EL) Always Below 1 Ω
      F12-2 (TRNR) - F44-6 (ER) Always Below 1 Ω
      2A-45 (TRNL) - Body ground Always 10 kΩ or higher
      F12-2 (TRNR) - Body ground Always 10 kΩ or higher

      Tech Tips

      *1: Measure the resistance by connecting the positive (+) tester probe to terminal F14-5 (HZCT) and the negative (-) tester probe to terminal F44-3 (LL) or F44-2 (LR).

      *2: Measure the resistance by connecting the positive (+) tester probe to terminal F44-3 (LL) or F44-2 (LR) and the negative (-) tester probe to terminal F14-5 (HZCT). Use this value only as a reference, as the resistance varies depending on the measurement instrument.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  8. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY (TURN SIGNAL SWITCH)


    1. for LHD:


      1. A019KY8E98
        Text in Illustration
        *1

        Component without harness connected

        (Headlight Dimmer Switch Assembly)

        Remove the headlight dimmer switch assembly Click here.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        13 (TR) - 12 (EL) Turn signal switch in right turn position Below 1 Ω
        Turn signal switch not in right turn position 10 kΩ or higher
        14 (CR) - 12 (EL) Turn signal switch in full right turn position Below 1 Ω
        Turn signal switch in full left turn position Below 1 Ω
        Turn signal switch in off position 10 kΩ or higher
        Turn signal switch in half right turn position 10 kΩ or higher
        Turn signal switch in half left turn position 10 kΩ or higher
        15 (TL) - 12 (EL) Turn signal switch in left turn position Below 1 Ω
        Turn signal switch not in left turn position 10 kΩ or higher

    2. for RHD:


      1. A019KY8E99
        Text in Illustration
        *1

        Component without harness connected

        (Headlight Dimmer Switch Assembly)

        Remove the headlight dimmer switch assembly Click here.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        16 (TR) - 19 (EL) Turn signal switch in right turn position Below 1 Ω
        Turn signal switch not in right turn position 10 kΩ or higher
        17 (CR) - 19 (EL) Turn signal switch in full right turn position Below 1 Ω
        Turn signal switch in full left turn position Below 1 Ω
        Turn signal switch in off position 10 kΩ or higher
        Turn signal switch in half right turn position 10 kΩ or higher
        Turn signal switch in half left turn position 10 kΩ or higher
        18 (TL) - 19 (EL) Turn signal switch in left turn position Below 1 Ω
        Turn signal switch not in left turn position 10 kΩ or higher

    NG

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY) AND BODY GROUND)


    1. Disconnect the F39*1 or F82*2 headlight dimmer switch assembly connector.

    2. Disconnect the F12 and F14 main body ECU (multiplex network body ECU) connectors.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      F14-27 (TRI) - F39-13 (TR) Always Below 1 Ω
      F14-28 (TLI) - F39-15 (TL) Always Below 1 Ω
      F12-13 (CNRI) - F39-14 (CR) Always Below 1 Ω
      F39-12 (EL) - Body ground Always Below 1 Ω
      F14-27 (TRI) - Body ground Always 10 kΩ or higher
      F14-28 (TLI) - Body ground Always 10 kΩ or higher
      F12-13 (CNRI) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      F14-27 (TRI) - F82-16 (TR) Always Below 1 Ω
      F14-28 (TLI) - F82-18 (TL) Always Below 1 Ω
      F12-13 (CNRI) - F82-17 (CR) Always Below 1 Ω
      F82-19 (EL) - Body ground Always Below 1 Ω
      F14-27 (TRI) - Body ground Always 10 kΩ or higher
      F14-28 (TLI) - Body ground Always 10 kΩ or higher
      F12-13 (CNRI) - Body ground Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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