ELECTRONICALLY CONTROLLED BRAKE SYSTEM > Skid Control Buzzer Circuit

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DESCRIPTION

The skid control buzzer sounds while the accumulator pressure is abnormally low or an abnormality causing low fluid pressure occurs, and then the VSC is activated.

WIRING DIAGRAM


C112010E03


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (Click here).

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SKID CONTROL BUZZER)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the intelligent tester main switch on.

  1. Select ACTIVE TEST mode on the intelligent tester.

    ABS / VSC / TRAC: 
    Item (Display)
    		Vehicle Condition/Test Details
    		Diagnostic Note
    BUZZER
    		Turns skid control buzzer ON/OFF
    		Buzzer can be heard

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

    Result:

    Condition
    		Proceed To
    Buzzer sounds/stops
    		A
    Buzzer does not sound or sounds constantly
    		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 (Click here).



A
END
B


2.INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)


    C107604E11

  1. Disconnect the skid control buzzer connector.

  1. Turn the ignition switch on.

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

    Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    V9-2 - Body ground
    		Ignition switch on
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT SKID CONTROL BUZZER


    C110516E01

  1. Disconnect the skid control buzzer connector.

  1. 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:
    Skid control buzzer sounds.



NG
REPLACE SKID CONTROL BUZZER
OK


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


    C113973E03

  1. Disconnect the skid control buzzer connector and the skid control ECU connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    S40-33 (VBZ) - V9-2 (VBZ)
    		Below 1 Ω
    S40-12 (BZ) - V9-1 (BZ)
    		Below 1 Ω

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

    Resistance:
    Tester Connection
    		Specified Condition
    S40-33 (VBZ) - Body ground
    		10 kΩ or higher
    S40-12 (BZ) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT SKID CONTROL ECU (GND TERMINAL)


    F047485E34

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

    Resistance:
    Tester Connection
    		Specified Condition
    S41-1 (GND1) - Body ground
    		Below 1 Ω
    S40-2 (GND2) - Body ground
    		Below 1 Ω
    S40-1 (GND3) - Body ground
    		Below 1 Ω
    S39-2 (GND4) - Body ground
    		Below 1 Ω
    S39-1 (GND5) - Body ground
    		Below 1 Ω
    S38-4 (GND6) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SKID CONTROL ECU