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Home >> Lexus >> 2021 >> 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) >> Brake Warning Light does not Come ON [09/2018 - 10/2023] >> Procedure

Brake Warning Light does not Come ON [09/2018 - 10/2023]: Procedure

  1. INSPECT COMBINATION METER ASSEMBLY 
    1. Turn the engine switch off.
    2. Perform Active Test of the combination meter assembly using the Techstream.

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Brake Warning
    3. Check the combination meter assembly.

      OK

      The brake system warning light (red indicator) turns on or off in accordance with the Techstream.

      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 

    INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 10/2023]