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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) >> Brake Warning Light does not Come ON [04/2018 - 08/2021] >> Procedure

Brake Warning Light does not Come ON [04/2018 - 08/2021]: Procedure

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  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if CAN communication system DTCs are output.

      Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -]

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

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

    Result: 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE WARNING LIGHT) 
    1. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

      Chassis > ABS/VSC/TRAC/EPB > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Brake Warning Light Brake system warning light (red indicator) Warning light OFF/ON Observe combination meter assembly

      Chassis > ABS/VSC/TRAC/EPB > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Brake Warning Light Brake system warning light (red indicator) ON or OFF ON: Warning light on
      OFF: Warning light off
      -

      Chassis > ABS/VSC/TRAC/EPB > Active Test 

      Active Test Display
      Brake Warning Light
      Data List Display
      Brake Warning Light
    2. Check the operating condition of the brake system warning light (red indicator) when operating it using the Techstream.

      Result

      Result Proceed to
      Brake warning light in the Data List does not change using the Active Test A
      Brake warning light in the Data List turns ON/OFF using the Active Test B

    Result: 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

    Result: 

    See step  3

  3. INSPECT COMBINATION METER ASSEMBLY 
    1. Enter the following menus: Body Electrical / Combination Meter / Active Test.
    2. Perform the 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 Techstream operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

    Result: 

    NG 

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