VSC Buzzer Circuit

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): VSC Buzzer Circuit
- VSC Buzzer Circuit

DESCRIPTION

The skid control ECU (master cylinder solenoid) is connected to the combination meter via CAN communication.

The combination meter has a built-in VSC warning buzzer:

* Sounds intermittently to inform the driver if the temperature of hydraulic brake booster has increased excessively due to continuous operation of TRAC, ATRAC and AUTO LSD.

* Sounds intermittently to inform the driver that the VSC is operating.

* Sounds continuously to alert the driver that the hydraulic pressure of accumulator in the hydraulic brake booster has decreased.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU (master cylinder solenoid), perform the zero point calibration Vehicle Stability Control System (for Hydraulic Brake Booster).

PROCEDURE

1. CHECK CAN COMMUNICATION LINE

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus Diagnosis System.

OK:

CAN Bus Check indicates no malfunctions in CAN communication.

NG -- GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) How to Proceed With Troubleshooting
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) According to the display on the tester, perform the Active Test.

ABS/VSC/TRAC





(f) Check that the buzzer sounds or stops in accordance with the Techstream.

Result





B -- USE SIMULATION METHOD TO CHECK Check for Intermittent Problems
A -- Continue to next step.

3. REPLACE COMBINATION METER ASSEMBLY

(a) Turn the ignition switch off.

(b) Replace the combination meter Removal.

NEXT -- Continue to next step.

4. PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) According to the display on the tester, perform the Active Test.

ABS/VSC/TRAC





(f) Check that the buzzer sounds or stops in accordance with the Techstream.

Result





B -- END

A -- REPLACE MASTER CYLINDER SOLENOID Disassembly