VEHICLE STABILITY CONTROL SYSTEM(for Hydraulic Brake Booster) Skid Control Buzzer Circuit

DESCRIPTION

The skid control buzzer sounds upon receiving a signal from the skid control ECU.

WIRING DIAGRAM

A01XLZJE05
*a Skid Control Buzzer
*b from IG1 Circuit
*c Master Cylinder Solenoid (Skid Control ECU)

CAUTION / NOTICE / HINT

Note

When replacing the master cylinder solenoid, perform calibration Click here.

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DSS SIGNAL BUZZER)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      DSS Signal Buzzer Skid control buzzer Buzzer ON/OFF The buzzer can be heard.

    6. Check that the skid control buzzer sounds/stops when turning the skid control buzzer on/off by using the intelligent tester.

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK TERMINAL VOLTAGE (IG1)


    1. Disconnect the A12 skid control buzzer connector.

    2. A01XLJ6E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control Buzzer)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A12-2 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SKID CONTROL BUZZER


    1. Remove the skid control buzzer Click here.

    2. A01XF7LE02
      Text in Illustration
      *a

      Component without harness connected

      (Skid Control Buzzer)

      Apply battery voltage to the skid control buzzer, and check that the buzzer sounds.

      OK
      Measurement Condition Specified Condition
      Battery positive (+) voltage - Terminal 2 (IG1) Skid control buzzer sounds
      Battery negative (-) voltage - Terminal 1 (BZ)

    NG

    REPLACE SKID CONTROL BUZZER ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - SKID CONTROL ECU)


    1. Disconnect the A7 skid control ECU connector.

    2. Disconnect the A12 skid control buzzer connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-30 (BZ) - A12-1 (BZ) Always Below 1 Ω
      A7-30 (BZ) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here