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Last Modified: 11-27-2007 1.6 J
Service Category: Brake Section: Brake Control/Dynamic Control System
Model Year: 2008 Model: LX570 Doc ID: RM000001DXP00JX
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 LX570)

Skid Control Buzzer Circuit

DESCRIPTION

The skid control buzzer sounds while the accumulator pressure is abnormally low or an abnormality causing low fluid pressure occurs, and the skid control buzzer sounds intermittently while the VSC and hill-start assist control is activated.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION (2008 LX570) .

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

Buzzer

Skid control buzzer

Buzzer ON/OFF

The buzzer can be heard.

(d) Check that the buzzer sounds/stops when turning the skid control buzzer on/off by using the Techstream.

Result

Result

Proceed to

Buzzer sounds/stops.

A

Buzzer does not sound or sounds constantly.

B
B

2.

INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)

(a) Disconnect the E5 skid control buzzer connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

E5-2 - Body ground

Engine switch on (IG)

11 to 14 V
OK

3.

INSPECT SKID CONTROL BUZZER

(a) Apply battery voltage to the skid control buzzer, and check that the buzzer sounds.

OK:

Measurement Condition

Specified Condition
  • Battery positive (+) voltage - Terminal 2
  • Battery negative (-) voltage - Terminal 1

Buzzer sounds
OK

4.

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

(a) Disconnect the A24 skid control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-30 (BZ) - E5-1

Always

Below 1 Ω

A24-30 (BZ) - Body ground

Always

10 kΩ or higher
OK