PRE-CRASH SAFETY SYSTEM SYSTEM DESCRIPTION

PRE-CRASH SAFETY SYSTEM

1. The pre-crash safety system optimizes and activates occupant protection equipment (see below) to attempt to reduce damage due to a collision.

OUTLINE OF PRE-CRASH SAFETY SYSTEM

1. When operating according to sensor detection:

   The millimeter wave radar sensor detects vehicles and other objects on the road in front of the user's vehicle. The distance control ECU determines if a collision is unavoidable based on object position, speed and track information. If the distance control ECU determines that a collision is unavoidable, it transmits this information to the following areas using CAN communication:

   
   

   • Seat belt control ECU (initiates control of pre-crash seat belts)

   • Skid control ECU (activates pre-crash brake assist)

   • Skid control ECU (activates pre-crash brake)

2. When operating as a result of sudden braking:

   The skid control ECU uses brake pressure information and other data to determine if the driver has suddenly applied the brakes. If so, the skid control ECU sends a signal to the seat belt control ECU through CAN communication and the pre-crash safety seat belt activates.

OUTLINE OF PRE-CRASH SEAT BELT CONTROL

1. The pre-crash seat belt operates depending on what the sensor detects, or whether sudden braking has occurred. The pre-crash safety seat belt motor tightens the seat belt to optimize occupant restraint performance.

2. Operative condition

   
   

   1. Refer to the sensor and sudden braking descriptions under "Outline of Pre-Crash Safety System" (see above).

OUTLINE OF PRE-CRASH BRAKE ASSIST CONTROL

1. The pre-crash brake assist operates depending on what the sensor detects. The system then enters standby mode before a collision. When the driver depresses the brake pedal, brake fluid pressure is increased to improve fluid pressure response and improve vehicle speed reduction rate.

2. Operative condition

   
   

   1. Refer to the sensor description under "Outline of Pre-Crash Safety System" (see above).

   2. When the driver depresses the brake pedal after the distance control ECU determines that a collision is unavoidable:

      Brake fluid pressure is increased at the same time the driver depresses the brake pedal.

   3. When the driver depresses the brake pedal before the distance control ECU determines that a collision is unavoidable:

      Brake fluid pressure is increased at the same time that the distance control ECU receives a pre-crash safety sensor signal (indicating that other vehicles or objects are in front of the vehicle).

OUTLINE OF PRE-CRASH BRAKE CONTROL

1. The pre-crash brake operates depending on what the sensor detects. This system can be canceled by the satellite switch (pre-crash brake off switch).

   Tech Tips

   While the pre-crash brake is canceled, the PCS indicator light on the combination meter blinks.

2. Operative condition

   
   

   1. Refer to the sensor description under "Outline of Pre-Crash Safety System" (see above).

   2. When the distance control ECU determines that a collision is unavoidable, the system performs brake control to reduce the vehicle speed.

OPERATIVE CONDITION AND INOPERATIVE CONDITION OF EACH CONTROL (REVIEW)

• *1: Operates when sudden braking or skidding is detected.

• *2: Operates according to sensor detection in either of the following situations.




• When the vehicle collides with an object outside the detection range of the millimeter wave radar sensor (side collision, rear collision, etc.)

• When the millimeter wave radar sensor cannot detect a possible collision object

• ○: Main basis for operation

• -: Not main basis for operation

PRECAUTION FOR PRE-CRASH SAFETY SYSTEM OPERATION