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Home >> Toyota >> 2020 >> Avalon Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 114 (Electronically Controlled Brake System - Diagnostic Codes (C1415-U0073) & Symptom Tests (Hybrid)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> DTC C1425: Open in Stop Switch Circuit; DTC P0573: Brake Switch "A" Circuit High [04/2018 - ] >> Procedure

DTC C1425: Open in Stop Switch Circuit; DTC P0573: Brake Switch "A" Circuit High [04/2018 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK STOP LIGHT OPERATION 
    1. Check that the stop lights come on when the brake pedal is depressed and go off when the brake pedal is released.

      OK

      Condition Illumination Condition
      Brake pedal depressed. On
      Brake pedal released. Off

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY) 
    1. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [04/2018 - ]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch assembly ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Stop Light SW
    2. Check that the stop light switch assembly display observed on the Techstream changes according to brake pedal operation.

      OK

      The Techstream displays on or off according to brake pedal operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [04/2018 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Turn the power switch off.
    3. Turn the power switch on (READY).
    4. Perform a road test.
    5. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [04/2018 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs C1425 and P0573 are not output. A
      DTCs C1425 and/or P0573 are output. B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    B 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

  4. CHECK HARNESS AND CONNECTOR (STP TERMINAL) 
    1. Turn the power switch off.
      GTY883900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK

      The connector is securely connected.

    3. Disconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A35-12 (STP) - Body ground Stop light switch assembly on
      (Brake pedal depressed)      		 11 to 14 V
      A35-12 (STP) - Body ground Stop light switch assembly off
      (Brake pedal released)      		 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

  5. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Check the stop light switch assembly.

      Refer to ON-VEHICLE INSPECTION [04/2018 - ]

      OK

      The stop light switch assembly is normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [04/2018 - ] 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (STP TERMINAL) 
    1. Turn the power switch off.
      GTY883900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK

      The connector is securely connected.

    3. Disconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A35-12 (STP) - Body ground Stop light switch assembly on
      (Brake pedal depressed)      		 11 to 14 V
      A35-12 (STP) - Body ground Stop light switch assembly off
      (Brake pedal released)      		 1.5 V or less

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

    Result: 

    OK 

    See step  7

  7. RECONFIRM DTC 
    1. Reconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.
    2. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [04/2018 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    3. Turn the power switch off.
    4. Turn the power switch on (READY).
    5. Perform a road test.
    6. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [04/2018 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs C1425 and P0573 are not output. A
      DTCs C1425 and/or P0573 are output. B

      HINT: 

      If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake booster with master cylinder assembly).

      Refer to REMOVAL [04/2018 - 08/2021] , or refer to REMOVAL [08/2021 - ]

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

    Result: 

    B 

    INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) 

    for HV Model with Cornering Light: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - 08/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2021 - ]

    for HV Model without Cornering Light: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - 08/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2021 - ]

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