Skid Control Buzzer Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BUZZER)

INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)

INSPECT SKID CONTROL BUZZER

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

Description

The skid control buzzer sounds while the accumulator pressure is abnormally low or an abnormality causing low fluid pressure occurs.

Wiring diagram

Skid Control Buzzer Circuit. Land Cruiser. Wiring diagram

Inspection procedure

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration .

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BUZZER)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and 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
    Buzzer Skid control buzzer Buzzer ON/OFF The 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
    Result Proceed to
    Buzzer sounds/stops A
    Buzzer does not sound or sounds constantly B
  A  
USE SIMULATION METHOD TO CHECK
 
B  
   

2.INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)

Skid Control Buzzer Circuit. Land Cruiser. Disconnect the E5 skid control buzzer connector.

  1. Disconnect the E5 skid control buzzer connector.

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

    Standard Voltage:

    Tester Connection Switch Condition Specified Condition
    E5-2 (IG1) - Body ground Ignition switch ON 11 to 14 V
  NG  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
   

3.INSPECT SKID CONTROL BUZZER

Skid Control Buzzer Circuit. Land Cruiser. Apply battery voltage to the skid control buzzer, and check that the buzzer sounds.

  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)
  NG  
REPLACE SKID CONTROL BUZZER ASSEMBLY
 
OK  
   

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

Skid Control Buzzer Circuit. Land Cruiser. Disconnect the A24 skid control ECU connector.

  1. Disconnect the A24 skid control ECU connector.

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

    Standard Resistance:

    Tester Connection Condition Specified Condition
    A24-30 (BZ) - E5-1 (BZ) Always Below 1 ?
    A24-30 (BZ) - Body ground Always 10 k? or higher
    Result
    Result Proceed to
    NG A
    OK LHD B
    RHD C
  B  
REPLACE MASTER CYLINDER SOLENOID
 
  C  
REPLACE MASTER CYLINDER SOLENOID
 
A  
   
REPAIR OR REPLACE HARNESS OR CONNECTOR