PRE-CRASH SAFETY SYSTEM GENERAL


  1. OUTLINE


    1. Pre-crash Safety System (PCS)


      1. The pre-crash safety system detects the possible collision of the vehicle with an obstacle, based on information received from various sensors. PCS lessens the damage sustained in the collision by working in unison with other systems to such as the seat belt retraction mechanism, and systems that dampen the impact of a collision, such as the brake control system.

      2. On models with driver monitor camera, when the system determines that there is a possibility of a collision, and it judges that the driver is not facing forward or eyelids are not open based on information from the driver monitor camera, pre-crash warnings are provided in advance to warn the driver. If the driver continues facing away from the road and the obstacle is vehicle ahead, the brakes will be applied briefly to provide a sensory warning to the driver (pre-crash alert braking).

      3. This system uses a millimeter wave radar sensor to detects a possible collision with a vehicle or obstacle in front. It retracts the seat belts before the collision and performs brake assist control and brake control.

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  2. PRECAUTION


    1. When the millimeter wave radar sensor assembly detects an object in front of the vehicle under the following conditions, the driving support ECU assembly may determine that a collision is unavoidable and operate the pre-crash safety system. This does not indicate a malfunction.

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      Text in Illustration
      *a Object on Road Surface at Corner Entrance (Guard Rail, Street Light, Sign, Signboard) *b Opposing Traffic Vehicle while Cornering
      *c Narrow Iron Bridge *d Metal Object, Steel Plate, or Bump on Road Surface
      *e Opposing Traffic at Intersection *f When Vehicle Ahead is Approached Suddenly
      *g When Passing through Toll Gate *h Metal Object such as Sign Board in Front of Vehicle on Uphill Slope
      *i Metal Object or Steel Plate in Ground at Base of Downhill Slope *j Vehicle Height Change Significantly (Front of Vehicle Inclined either Upward or Downward)

      Detection may also not be possible under the following conditions:


      • When passing road signs, billboards and overpasses.

      • When passing through an intersection.

      • When driving on bumpy road.

      • When the axis of the millimeter wave radar sensor assembly displaced.

    2. The millimeter wave radar sensor assembly may not be able to perform detection in the following case:


      • A collision has occurred with an object outside the detection area.

    3. The millimeter wave radar sensor assembly might not be able to detect the following objects as collision objects:

      Objects that cannot be detected Plastic items (safety cones, etc.), etc.
      Objects that cannot be detected in a stable manner People, bicycles, motorcycles, trees, animals, snow fence, etc.

    4. The following conditions make object detection difficult or impossible.


      • When there is a sharp corner or bumpy road.

      • When the vehicle's direction of travel is interrupted.

      • When poor whether (such as rain, fog, snow, sandstorms and so on).

      • When the vehicle height changes significantly (for example, the front of vehicle is inclined either upward or downword).

      • When the axis of the millimeter wave radar sensor assembly is displaced.

      • If the vehicle is sideslipping when the VSC is not activated.