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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 308 (Dynamic Radar Cruise Control System (M20A-FKS) - Diagnostic Codes & Circuit Tests) >> DYNAMIC RADAR CRUISE CONTROL SYSTEM (for M20A-FKS) >> DTC P0571-62: Brake Switch "A" Signal Compare Failure [01/2019 - 09/2022] >> Procedure

DTC P0571-62: Brake Switch "A" Signal Compare Failure [01/2019 - 09/2022]: Procedure

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  1. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Disconnect the A53 stop light switch assembly connector.
      GTY839591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A53-2 (GND) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A53-7 (B) - Body ground Always 11 to 14 V
      A53-6 (B) - Body ground Ignition switch ON 11 to 14 V
      A53-6 (B) - Body ground Ignition switch off Below 1 V
    4. Connect the A53 stop light switch assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Inspect the stop light switch assembly.

      Refer to ON-VEHICLE INSPECTION [01/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY) 
    1. Disconnect the A47 ECM connector.
    2. Disconnect the A53 stop light switch assembly connector.
    3. Disconnect the A51 skid control ECU (brake actuator assembly) connector.
    4. Disconnect the O61 certification ECU (smart key ECU assembly) connector.*
    5. Disconnect the I17 shift lock control ECU (shift lock control unit assembly) connector.*
    6. Disconnect the C80 TCM connector.*
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A47-22 (ST1-) - A53-5 (L) Always Below 1 Ω
      A47-21 (STP) - A53-3 (L) Always Below 1 Ω
      A47-22 (ST1-) or A53-5 (L) - Body ground Always 10 kΩ or higher
      A47-21 (STP) or A53-3 (L) - Body ground Always 10 kΩ or higher
    8. Connect the C80 TCM connector.*
    9. Connect the I17 shift lock control ECU (shift lock control unit assembly) connector.*
    10. Connect the O61 certification ECU (smart key ECU assembly) connector.*
    11. Connect the A51 skid control ECU (brake actuator assembly) connector.
    12. Connect the A53 stop light switch assembly connector.
    13. Connect the A47 ECM connector.
      1. *: w/ Smart Key System

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  COMPONENTS [06/2018 - 09/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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