ELECTRONICALLY CONTROLLED BRAKE SYSTEM > Skid Control Buzzer Circuit

for Preparation Click here


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


C109413E01


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 engine switch on (IG) and turn the intelligent tester main switch on.

  1. Select ACTIVE TEST mode on the intelligent tester.

    ABS / VSC / TR(A)C: 
    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 by 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).



B
Go to step 2
A

END 

2.INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)


    C107604E09

  1. Disconnect the skid control buzzer connector.

  1. Turn the engine switch on (IG).

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

    Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L11-2 - Body ground
    		Engine switch on (IG)
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
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 (SKID CONTROL ECU TO SKID CONTROL BUZZER)


    I045407E05

  1. Disconnect the skid control ECU connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-6 (BZ) - L11-1
    		Below 1 Ω
    A13-6 (BZ) - Body ground
    		10 kΩ or higher
    A13-22 (VBZ) - L11-2
    		Below 1 Ω
    A13-22 (VBZ) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT SKID CONTROL ECU (GND TERMINAL)


    C110724E13

  1. Disconnect the skid control ECU (A13, A15) connectors.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-1 (GND) - Body ground
    		Below 1 Ω
    A15-1 (GND4) - Body ground
    		Below 1 Ω

    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 (Click here).



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK

REPLACE SKID CONTROL ECU