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Home >> Toyota >> 2018 >> Prius Four >> Repair and Diagnosis >> External Pages >> Different car >> Section 342 (Electric Parking System - Diagnostic Codes & Symptom Tests (Except Hybrid)) >> ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model) >> Symptom Tests >> Brake Warning Light (Yellow) Remains On [08/2021 -] >> Procedure

Brake Warning Light (Yellow) Remains On [08/2021 -]: Procedure

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  1. CHECK VEHICLE CONTROL HISTORY (RoB) (ELECTRIC PARKING BRAKE SYSTEM) 
    1. Using the Techstream, check for Vehicle Control History (RoB).

      Chassis > Brake/EPB > Utility 

      Tester Display
      Vehicle Control History (RoB)

      HINT: 

      If vehicle control history (RoB) is stored when the electric parking brake system is suspended, the brake warning light (yellow) illuminates.

      Result

      Result Proceed to
      There is no vehicle control history (RoB) for when the electric parking brake system was suspended. A
      There is vehicle control history (RoB) for when the electric parking brake system was suspended. B

    Result: 

    B 

    ERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY (RoB) 

    Refer to VEHICLE CONTROL HISTORY (RoB) [08/2021 -]

    NOTE:

    After performing troubleshooting and repair regarding vehicle control history (RoB), clear the vehicle control history (RoB).

    Result: 

    A 

    See step  2

  2. INSPECT COMBINATION METER ASSEMBLY (BRAKE WARNING LIGHT (YELLOW)) 
    1. Perform the Active Test of the combination meter assembly using the Techstream.

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      ECB Warning
    2. Check the combination meter assembly.

      OK

      The brake warning light (yellow) turns on or off in accordance with Techstream operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

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