Vehicle Stability Control System (W/O Vdim) Skid Control Buzzer Circuit

Brake. Lexus Is250, Is220D. Gse20 Ale20
Brake Control. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SKID CONTROL BUZZER)

INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)

INSPECT SKID CONTROL BUZZER

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

VEHICLE STABILITY CONTROL SYSTEM (w/o VDIM) - Skid Control Buzzer Circuit


DESCRIPTION

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

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/O Vdim) Skid Control Buzzer Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (Click here).
1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SKID CONTROL BUZZER)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Select the Active Test mode on the intelligent tester.

    ABS / VSC:
    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 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 (Click here).


B
END
A


2.INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/O Vdim) Skid Control Buzzer Circuit

  1. Turn the engine switch off.

  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.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    J18-2 - 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


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/O Vdim) Skid Control Buzzer Circuit

  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 - SKID CONTROL BUZZER)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/O Vdim) Skid Control Buzzer Circuit

  1. Turn the engine switch off.

  1. Disconnect the skid control ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A14-30 (BZ) - J18-1
    		Always
    		Below 1 Ω
    A14-30 (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 (Click here).


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY