System Outline

1. ABS Operation 

   If the brake pedal is depressed suddenly, the ABS controls the hydraulic pressure of the wheel cylinders for all four wheels automatically to prevent the wheels from locking and ensure the directional and steering stability of the vehicle. If the brake pedal is depressed suddenly, the skid control ECU controls the solenoids in the actuators using the signals from the sensors to move the brake fluid to the reservoir in order to release the braking pressure applied to the wheel cylinders. If the skid control ECU detects that the fluid pressure in the wheel cylinders is insufficient, the ECU adjusts the solenoids in the actuators to increase the braking pressure.

2. Traction Control Operation 

   The traction control system controls the engine torque, the hydraulic pressure of the driving wheel cylinders, and any slipping of the wheels which may occur at take off or when accelerating the vehicle. This is to optimize the driving power and vehicle stability according to the road conditions.

3. VSC Operation 

   Unexpected road conditions, vehicle speed, emergency situations, and other external factors may cause an excessive under or over-steer of the vehicle. If this occurs, the VSC system automatically controls the engine power and wheel brakes to reduce the under- or over-steer.

   To reduce excessive over-steer :

   If the VSC system determines that the over-steer is excessive, it activates the brakes for the outer turning wheels according to the degree of the over-steer, to produce moment toward the outside of the vehicle and reduce the over-steer.

   To reduce excessive under-steer :

   If the VSC system determines that the under-steer is excessive, it adjusts the engine power and activates the rear wheel brakes to reduce the under-steer.

4. Fail Safe Function 

If an error occurs in the skid control ECU, sensor signals, and/or actuators, the skid control ECU prohibits the brake actuator control and sends an error signal to the engine control module. According to the error signal, the brake actuator will turn off the solenoid and the engine control module rejects any electronically controlled throttle open request from the VSC system. As a result, the vehicle will continue to function, but without the ABS, TRAC, and VSC systems.

* The system reaches an ignition judgment to deploy the following device based on the signals received from the front airbag sensor and deceleration sensor.

• river Airbag
• Front Passenger Airbag
• Knee Airbag
• Seat Belt Pretensioner

* The system reaches an ignition judgment to deploy the following device based on the signals received from the side airbag sensors.

• Side Airbags
• Curtain Shield Airbags

* The dual-stage SRS airbag system has been used for the driver and front passenger airbags. This system controls the optimal airbag inflation by judging the extent of impact, seat position (driver seat) and whether or not the seat belt is fastened (driver seat) and information from the Front Passenger Occupant Classification System.

* The front passenger occupant classification system judges whether the front passenger seat is occupied by an adult or child (with child seat) or is unoccupied, according to the load applied to the front passenger seat, seat position (passenger), the load applied to the belt tension sensor (passenger), and whether the seat belt is buckled (passenger). Based on the results, it restricts the deployment of the front passenger airbag, front passenger side airbag, and front passenger seat belt pretensioner. In addition, the system informs the driver of the result of the judgment through the use of the AIRBAG ON/OFF indicator lights.

* The airbag manual ON-OFF switch is used to disable the deployment of the front and side airbags for the front passenger, such as when a child seat is installed on the front passenger seat.

* The airbag sensor assembly transmits a signal to the main body ECU in order to release the door lock.