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Inspection Procedure

NOTE: When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).
  1. PERFORM ACTIVE TEST USING TECHSTREAM (SKID CONTROL BUZZER) 
    1. Connect Techstream to the DLC3.
    2. Start the engine.
    3. Select the Active Test mode on Techstream (See DATA LIST/ACTIVE TEST ).

      ABS/VSC/TRAC: 

      ABS/VSC/TRAC TESTER DISPLAY REFERENCE

      Tester Display Test Part Control Range Diagnostic Note
      Buzzer Skid control buzzer Buzzer ON/OFF Buzzer can be heard
    4. Check that the buzzer sounds/stops when turning the skid control buzzer on/off by using Techstream.

    Result 

    RESULT CHART

    Result Proceed to
    Buzzer does not sound or sounds constantly A
    Buzzer sounds/stops B

    HINT:

    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE ).

    B: END 

    A: Go to next step 

  2. INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL) 
    1. Turn the ignition switch off.
    2. Disconnect the skid control buzzer connector.
    3. Turn the ignition switch on (IG).
    4. Measure the voltage according to the value (s) in the table below.

    Standard voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    A16-2 - Body ground Ignition switch on (IG) 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    Fig 1: Identifying Skid Control Buzzer Connector Terminals
    G06120673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. INSPECT SKID CONTROL BUZZER 
    1. Turn the ignition switch off.
    2. Apply battery negative voltage to terminal 1, and battery positive voltage to terminal 2 of the skid control buzzer, and then check that the buzzer sounds.

    OK: 

    The skid control buzzer sounds. 

    NG: REPLACE SKID CONTROL BUZZER  (See REMOVAL )

    Fig 2: Inspecting Skid Control Buzzer
    G05752667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL BUZZER) 
    1. Disconnect the skid control ECU connector.
    2. Measure the resistance according to the value (s) in the table below.

    Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    A24-21 (BZ) - A16-1 Always Below 1 Ω
    A24-21 (BZ) - Body ground Always 10 kΩ or higher

    HINT:

    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See PROBLEM SYMPTOMS TABLE ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 3: Identifying Skid Control ECU And Skid Control Buzzer Connector Terminals
    G06120675Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL )

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