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 No. 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

B001MQZE05

CAUTION / NOTICE / HINT

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.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. READ VALUE 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 / Data List.

    5. Read the Data List according to 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 turn position signal/ON or OFF

      ON: Turn signal switch in right turn position

      OFF: Turn signal switch in neutral position

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

      ON: Turn signal switch in left turn position

      OFF: Turn signal switch in neutral position

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

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

      OFF: Turn signal switch in neutral, 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
      H35-4 (B) - Body ground Power switch off 11 to 14 V
      H35-1 (IG) - Body ground Power 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
      H35-7 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Disconnect the H17 and H18 main body ECU (multiplex network body ECU) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H35-6 (ER) - H17-16 (TRNR) Always Below 1 Ω
      H35-5 (EL) - H18-5 (TRNL) Always Below 1 Ω
      H35-6 (ER) - Body ground Always 10 kΩ higher
      H35-5 (EL) - Body ground Always 10 kΩ higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT TERMINAL VOLTAGE (TURN SIGNAL OUTPUT SIGNAL)


    1. Install the turn signal flasher assembly Click here.

    2. Reconnect the H17 and H18 main body ECU (multiplex network body ECU) connectors.

    3. B001LCPE02
      Text in Illustration
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H17-5 (HZCT) - Body ground Power switch on (IG), turn signal switch in right turn position Below 1 V ←→ 11 to 14 V (60 to 120 times per minute)
      H17-5 (HZCT) - Body ground Power switch on (IG), turn signal switch in left turn position Below 1 V ←→ 11 to 14 V (60 to 120 times per minute)

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. for Light Control Switch LH Side Type:


      1. B001MOGE02
        Text in Illustration
        *a

        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 in neutral 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 neutral 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 in neutral position 10 kΩ or higher

    2. for Light Control Switch RH Side Type:


      1. B001MOGE03
        Text in Illustration
        *a

        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 in neutral 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 neutral 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 in neutral 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 H26 headlight dimmer switch assembly connector.

    2. Disconnect the H17 and H18 main body ECU (multiplex network body ECU) connectors.

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

      Standard Resistance
      for Light Control Switch LH Side Type
      Tester Connection Condition Specified Condition
      H17-25 (TRI) - H26-13 (TR) Always Below 1 Ω
      H17-26 (TLI) - H26-15 (TL) Always Below 1 Ω
      H18-13 (CNRI) - H26-14 (CR) Always Below 1 Ω
      H26-12 (EL) - Body ground Always Below 1 Ω
      H17-25 (TRI) - Body ground Always 10 kΩ or higher
      H17-26 (TLI) - Body ground Always 10 kΩ or higher
      H18-13 (CNRI) - Body ground Always 10 kΩ or higher
      for Light Control Switch RH Side Type
      Tester Connection Condition Specified Condition
      H17-25 (TRI) - H26-16 (TR) Always Below 1 Ω
      H17-26 (TLI) - H26-18 (TL) Always Below 1 Ω
      H18-13 (CNRI) - H26-17 (CR) Always Below 1 Ω
      H26-19 (EL) - Body ground Always Below 1 Ω
      H17-25 (TRI) - Body ground Always 10 kΩ or higher
      H17-26 (TLI) - Body ground Always 10 kΩ or higher
      H18-13 (CNRI) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR