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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 375 (Engine Control System (2ZR-FAE) - Diagnostic Codes (6 Of 8)) >> SFI System >> DTC P0724: Brake Switch "B" Circuit High [01/2019 - 03/2019] >> Procedure

DTC P0724: Brake Switch "B" Circuit High [01/2019 - 03/2019]: Procedure

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  1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Stop Light Switch
    5. Read the values displayed on the Techstream.

      OK

      Techstream Display Measurement Item/Range (display) Normal Condition
      Stop Light Switch Stop light switch status: ON or OFF
      • ON: Brake pedal depressed
      • OFF: Brake pedal released

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [01/2019 - 11/2022] 

    Result: 

    NG 

    See step  2

  2. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION 
    1. Check the stop light switch assembly installation.

      Refer to INSTALLATION [01/2019 - ] .

      OK

      Stop light switch assembly is installed correctly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY. Refer to  INSTALLATION [01/2019 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK TERMINAL VOLTAGE (STP VOLTAGE) 
    GTY873456Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Brake Pedal Depressed *b Brake Pedal Released
    *c Front view of wire harness connector
    (to ECM)    		 - -
    1. Disconnect the ECM connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Brake Pedal Operation Specified Condition
      A46-9 (STP) - Body ground Released Below 1.5 V
      Depressed 7.5 to 14 V

      HINT: 

      If there is a short in the STP terminal circuit, there may be a malfunction in the circuit of a connected ECU.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the stop light switch assembly connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A53-3 (L) or A46-9 (STP) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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