Vehicle Stability Control System (For Hydraulic Brake Booster) Skid Control Buzzer Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DSS SIGNAL BUZZER)

CHECK TERMINAL VOLTAGE (IG1)

INSPECT SKID CONTROL BUZZER

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

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


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Vehicle Stability Control System (For Hydraulic Brake Booster) Skid Control Buzzer Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the master cylinder solenoid, perform calibration (LandCruiser RM00000452J00ZX.html).
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DSS SIGNAL BUZZER)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. 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.

  1. 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 (LandCruiser RM000003YMJ00XX.html)
A


2.CHECK TERMINAL VOLTAGE (IG1)

  1. Disconnect the A12 skid control buzzer connector.



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Vehicle Stability Control System (For Hydraulic Brake Booster) Skid Control Buzzer Circuit

  1. 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
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control Buzzer)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT SKID CONTROL BUZZER

  1. Remove the skid control buzzer (LandCruiser RM000001WYY052X.html).



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Brake Control Dynamic Control Systems.Anti-Lock Brake System.Vehicle Stability Control System (For Hydraulic Brake Booster) Skid Control Buzzer Circuit

  1. 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)
    Text in Illustration
    *a
    		Component without harness connected
    (Skid Control Buzzer)


NG
REPLACE SKID CONTROL BUZZER ASSEMBLY (LandCruiser RM000001WYY052X.html)
OK


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

  1. Disconnect the A7 skid control ECU connector.

  1. Disconnect the A12 skid control buzzer connector.

  1. 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


B
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02DX.html)

C
REPLACE MASTER CYLINDER SOLENOID (LandCruiser RM00000171U02EX.html)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR