ELECTRONICALLY CONTROLLED BRAKE SYSTEM Skid Control Buzzer Circuit

DESCRIPTION

The skid control buzzer assembly sounds intermittently to warn the driver when the accumulator pressure is abnormally low.

WIRING DIAGRAM

A01FVJ0E03

INSPECTION PROCEDURE

Note

When replacing the skid control ECU assembly, perform initialization and calibration of the linear solenoid valve Click here.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (SKID CONTROL BUZZER ASSEMBLY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Active Test on the GTS Click here.

      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.

      w/o Dynamic Radar Cruise Control System:

      The item is displayed on the GTS but not used.

    4. Check that the buzzer sounds/stops when turning the skid control buzzer assembly on/off using the GTS.

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

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. INSPECT SKID CONTROL BUZZER ASSEMBLY


    1. A01FSFHE22
      Text in Illustration
      *a

      Component without harness connected

      (Skid Control Buzzer Assembly)

      Turn the power switch off.

    2. Remove the skid control buzzer assembly.

    3. Connect a negative (-) lead from the battery to terminal 1 (BZ), and a positive (+) lead to terminal 2 (VBZ) of the skid control buzzer assembly, and then check that the buzzer sounds.

      OK
      The skid control buzzer assembly sounds.

    NG

    REPLACE SKID CONTROL BUZZER ASSEMBLY Click here

    OK

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


    1. Disconnect the A14 skid control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A14-22 (BZ) - N1-1 (BZ) Always Below 1 Ω
      A14-22 (BZ) - Body ground Always 10 kΩ or higher
      A14-41 (VBZ) - N1-2 (VBZ) Always Below 1 Ω
      A14-41 (VBZ) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. A01FSXRE16
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU Assembly)

      Disconnect the skid control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A14-1 (GND) - Body ground Always Below 1 Ω
      A16-1 (GND4) - Body ground Always Below 1 Ω

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

    REPLACE SKID CONTROL ECU ASSEMBLY Click here