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Home >> Lexus >> 2018 >> LS 500 Base, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (4 Of 4) & Symptom Tests >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> VSC OFF Switch Circuit [09/2018 - 10/2023] >> Procedure

VSC OFF Switch Circuit [09/2018 - 10/2023]: Procedure

  1. READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [09/2018 - 10/2023]

      Chassis > Brake > 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 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
      Not defined: Not defined
      VSC OFF mode (TRC(TRAC) OFF/VSC OFF): VSC off mode      		 -

      Chassis > Brake > Data List 

      Tester Display
      TRC(TRAC)/VSC OFF Mode
    4. Check that the indicator light and mode condition on the Techstream change according to VSC OFF switch (No. 2 satellite switch set) operation.

      Standard

      Switch Operation Mode Condition Display Multi-information Display (TRAC OFF Message) VSC OFF Indicator Light
      Not pressed Normal Not displayed Does not come on
      Pressing the VSC OFF switch (No. 2 satellite switch set) TRAC OFF Displayed Does not come on
      Pressing and holding the VSC OFF switch (No. 2 satellite switch set) 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 [12/2017 - 10/2023] 

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

    Result: 

    A 

    See step  2

  2. INSPECT NO. 2 SATELLITE SWITCH SET 
    1. Turn the engine switch off.
    2. Remove the VSC OFF switch (No. 2 satellite switch set).

      Refer to REMOVAL [12/2017 - ]

    3. Inspect the VSC OFF switch (No. 2 satellite switch set).

      Refer to INSPECTION [12/2017 - ]

      OK

      The VSC OFF switch (No. 2 satellite switch set) operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 SATELLITE SWITCH SET. Refer to  REMOVAL [12/2017 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - NO. 2 SATELLITE SWITCH SET) 
    1. Disconnect the A9 skid control ECU (brake actuator assembly) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A9-33 (CSW) - G59-2 (+) Always Below 1 Ω
      A9-33 (CSW) or G59-2 (+) - Body ground Always 10 kΩ or higher
      G59-7 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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