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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 164 (Engine Control System (M20A-FKS) - Diagnostic Codes (P0627-P106A)) >> SFI System >> DTC P0703-12: Brake Switch "B" Circuit Short to Battery [06/2018 - 03/2019] >> Procedure

DTC P0703-12: Brake Switch "B" Circuit Short to Battery [06/2018 - 03/2019]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. READ VALUE USING TECHSTREAM (STOP LIGHT SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Stop Light SW.

      Powertrain > Engine > Data List 

      Tester Display
      Stop Light SW
    5. Read the Data List displayed on the Techstream.

      OK

      Techstream Display Measurement Item/Range (Display) Normal Condition
      Stop Light SW Stop light switch assembly 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 [06/2018 - ]

    Result: 

    NG 

    See step  2

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

      Refer to INSTALLATION [06/2018 - 01/2019] , or refer to INSTALLATION [01/2019 - ]

      OK

      Stop light switch is installed correctly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY 

    Refer to INSTALLATION [06/2018 - 01/2019] , or refer to INSTALLATION [01/2019 - ]

    Result: 

    OK 

    See step  3

  3. CHECK TERMINAL VOLTAGE (STP VOLTAGE) 
    GTY945494Courtesy 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
      A47-21 (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 [06/2018 - 01/2019] , or refer to REMOVAL [01/2019 - 03/2019]

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM) 
    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 A47-21 (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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