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Home >> Toyota >> 2016 >> Prius Four >> Repair and Diagnosis >> External Pages >> Different car >> Section 415 (Electronically Controlled Brake System - Diagnostic Codes (P0571-U0074) & Symptom Tests (Except Hybrid)) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> VSC OFF Switch Circuit [08/2021 -] >> Procedure

VSC OFF Switch Circuit [08/2021 -]: Procedure

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  1. READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Enter the following menus: Chassis / Brake/EPB / Data List.

      Chassis > Brake/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      TRC(TRAC)/VSC OFF Mode TRAC/VSC off mode Normal mode (TRC(TRAC) ON/VSC ON) /
      TRC(TRAC) OFF mode (TRC(TRAC) OFF/VSC ON) /
      VSC expert mode (VSC expert mode MID ON) /
      VSC OFF mode (TRC(TRAC) OFF/VSC OFF)      		 Normal mode (TRC(TRAC) ON/VSC ON): Normal mode
      TRC(TRAC) OFF mode (TRC(TRAC) OFF/VSC ON): TRAC off mode
      VSC expert mode (VSC expert mode MID ON): VSC expert mode
      VSC OFF mode (TRC(TRAC) OFF/VSC OFF): VSC off mode      		 -

      Chassis > Brake/EPB > Data List 

      Tester Display
      TRC(TRAC)/VSC OFF Mode
    4. Check the indicator light and mode condition on the Techstream changes according to VSC OFF switch operation.

      Standard

      Switch Operation Mode Condition Display Multi-information Display ("Traction Control Turned Off") VSC OFF Indicator Light
      Not pressed Normal mode (TRC(TRAC) ON/VSC ON) Not displayed Does not come on
      Pressing the VSC OFF switch TRC(TRAC) OFF mode (TRC(TRAC) OFF/VSC ON) Displayed Does not come on
      Pressing and holding the VSC OFF switch VSC OFF mode (TRC(TRAC) OFF/VSC OFF) Displayed Comes on

      Result

      Result Proceed to
      Indicator light and mode condition display do not change A
      Mode condition display is normal, but indicator light does not change B
      Indicator light and mode condition display are normal C

    Result: 

    B 

    INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

    Result: 

    C 

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

    Result: 

    A 

    See step  2

  2. INSPECT VSC OFF SWITCH 
    1. Inspect the VSC OFF switch.

      Refer to INSPECTION [04/2018 -]

      OK

      The VSC OFF switch is normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE VSC OFF SWITCH. Refer to  REMOVAL [04/2018 -] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - VSC OFF SWITCH) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

      OK

      The connector is securely connected.

    2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
    3. Disconnect the G26 VSC OFF switch connector.
    4. Check both the connector case and the terminals for deformation and corrosion.

      OK

      No deformation or corrosion.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G26-5 (+) - A28-38 (CSW) Always Below 1 Ω
      G26-5 (+) or A28-38 (CSW) - Body ground Always 10 kΩ or higher
      G26-2 (E) - Body ground 1 minute or more after disconnecting the cable from the negative (-) battery terminal Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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