Pre-Crash Safety System System Description

The pre-crash safety system uses the pre-crash alarm control, pre-crash brake assist control and pre-crash brake control to help avoid a collision or reduce the impact if it determines that the possibility of a collision is high based on the position and relative speed of a preceding vehicle.

The operation of this system can be turned off and on using the setting screen of the multi-information display.

The millimeter wave radar sensor assembly and forward recognition camera detect the position and relative speed of preceding vehicles and pedestrians*. This information is sent to the driving support ECU assembly to determine if the possibility of a collision is high.

1. *: Depending on the vehicle destination and specifications, the pedestrian detection function may not be available.
   

PRE-CRASH ALARM:

1. When the system determines that the possibility of a frontal collision is high, a buzzer will sound and a warning message will be displayed on the multi-information display to urge the driver to take evasive action.
   

PRE-CRASH BRAKE ASSIST:

1. When the system determines that the possibility of a frontal collision is high, the system applies greater braking force in relation to how strongly the brake pedal is depressed.
   

PRE-CRASH BRAKE*:
*: Depending on the region in which the vehicle was sold, the pre-crash brake control function may not be available.

1. When the system determines that the possibility of a frontal collision is high, the system warns the driver. If the system determines that the possibility of a collision is extremely high, the brakes are automatically applied to help avoid the collision or reduce the collision speed.
   

   HINT:

   1. The vehicle may creep after the pre-crash brake function has operated, the driver should depress the brake pedal as necessary.
      
   2. If the accelerator pedal is being depressed strongly or the steering wheel is being turned, the system may determine that the driver is taking evasive action and possibly prevent the pre-crash brake function from operating.
      

ADAPTIVE VARIABLE SUSPENSION CONTROL (w/ AVS SYSTEM):

1. When the driving support ECU determines that the possibility of a frontal collision is high, the adaptive variable suspension system controls the damping force of the shock absorbers to enhance the response of the vehicle.
   

In some situations such as the following, the system may determine that there is a possibility of a frontal and operate.

1. When passing a vehicle or pedestrian*
   
2. When changing lanes while overtaking a preceding vehicle
   
3. When overtaking a preceding vehicle that is changing lanes
   
4. When overtaking a preceding vehicle that is making a left/right turn
   
5. When passing a vehicle in an oncoming lane that is stopped to make a right/left turn
   
6. When driving on a road where relative location to vehicle ahead in an adjacent lane may change, such as on a winding road
   
7. When a preceding vehicle suddenly decelerates
   
8. If the front of the vehicle is raised or lowered, such as when the road surface is uneven or undulating
   
9. When approaching objects on the roadside, such as guardrails, utility poles, trees, or walls
   
10. When there is a vehicle, pedestrian*, or object by the roadside at the entrance of a curve
    
11. When driving on a narrow path surrounded by a structure, such as in a tunnel or on an iron bridge
    
12. When there is a metal object (manhole cover, steel plate, etc.), steps, or a protrusion on the road surface or roadside
    
13. When a crossing pedestrian approaches very close to the vehicle*
    
14. When passing through a place with a low structure above the road (low ceiling, traffic sign, etc.)
    
15. When passing under an object (billboard, etc.) at the top of an uphill road
    
16. When rapidly closing on an electric toll gate barrier, parking area barrier, or other barrier that opens and closes
    
17. When using an automatic car wash
    
18. When driving through or under objects that may contact the vehicle, such as thick grass, tree branches, or a banner
    
19. When the vehicle is hit by water, snow, dust, etc. from a vehicle ahead
    
20. When driving through steam or smoke
    
21. When there are patterns or paint on the road or a wall that may be mistaken for a vehicle or pedestrian*
    
22. When driving near an object that reflects radio waves, such as a large truck or guardrail
    
23. When driving near a TV tower, broadcasting station, electric power plant, or other location where strong radio waves or electrical noise may be present
    

In some situations such as the following, a vehicle may not be detected by the millimeter wave radar sensor assembly and forward recognition camera, preventing the system from operating properly:

1. If an oncoming vehicle is approaching your vehicle
   
2. If a vehicle ahead is a motorcycle or bicycle
   
3. When approaching the side of a vehicle
   
4. If a preceding vehicle has a small rear end, such as an unloaded truck
   
5. If a preceding vehicle has a low rear end, such as a low bed trailer
   
6. If a vehicle ahead is carrying a load which protrudes past its rear bumper
   
7. If a vehicle ahead has extremely high ground clearance
   
8. If a vehicle ahead is irregularly shaped, such as a tractor or side car
   
9. If the sun or other light is shining directly on a vehicle ahead
   
10. If a vehicle cuts in front of your vehicle or emerges from beside a vehicle
    
11. If a vehicle ahead makes an abrupt maneuver (such as sudden swerving, acceleration or deceleration)
    
12. When suddenly cutting behind a preceding vehicle
    
13. When a vehicle ahead is not directly in front of your vehicle
    
14. When driving in inclement weather such as heavy rain, fog, snow or a sandstorm
    
15. When the vehicle is hit by water, snow, dust, etc. from a vehicle ahead
    
16. When driving through steam or smoke
    
17. When driving in a place where the surrounding brightness changes suddenly, such as at the entrance or exit of a tunnel
    
18. When a very bright light, such as the sun or the headlights of oncoming traffic, shines directly into the forward recognition camera
    
19. When the surrounding area is dim, such as at dawn or dusk, or while at night or in a tunnel
    
20. After the engine has started the vehicle has not been driven for a certain amount of time
    
21. While making a left/right turn and for a few seconds after making a left/right turn
    
22. While driving on a curve and for a few seconds after driving on a curve
    
23. If your vehicle is skidding
    
24. If the front of the vehicle is raised or lowered, such as when the road surface is uneven or undulating
    
25. If the wheels are misaligned
    
26. If a wiper blade is blocking the forward recognition camera
    
27. The vehicle is wobbling
    
28. The vehicle is being driven at extremely high speeds
    
29. When driving on a hill
    

In some situations such as the following, sufficient braking force may not be obtained, preventing the system from performing properly:

1. If the braking functions cannot operate to their full extent, such as when the brake parts are extremely cold, extremely hot, or wet
   
2. If the vehicle is not properly maintained (brakes or tires are excessively worn, improper tire inflation pressure, etc.)
   
3. When the vehicle is being driven on a gravel road or other slippery surface
   

Some pedestrians such as the following may not be detected by the millimeter wave radar sensor assembly and forward recognition camera, preventing the system from operating properly*:

1. Pedestrians shorter than approximately 3.2 ft. (100 cm) or taller than approximately 6.5 ft. (2 m)
   
2. Pedestrians wearing oversized clothing (a rain coat, long skirt, etc.), making their silhouette obscure
   
3. Pedestrians who are carrying large baggage, holding an umbrella, etc., hiding part of their body
   
4. Pedestrians who are bending forward or squatting
   
5. Pedestrians who are pushing a stroller, wheelchair, bicycle or other vehicle
   
6. Groups of pedestrians which are close together
   
7. Pedestrians who are wearing white and look extremely bright
   
8. Pedestrians in the dark, such as at night or while in a tunnel
   
9. Pedestrians whose clothing appears to be nearly the same color or brightness as their surroundings
   
10. Pedestrians near walls, fences, guardrails, or large objects
    
11. Pedestrians who are on a metal object (manhole cover, steel plate, etc.) on the road
    
12. Pedestrians who are walking fast
    
13. Pedestrians who are changing speed abruptly
    
14. Pedestrians running out from behind a vehicle or a large object
    
15. Pedestrians who are extremely close to the side of the vehicle (outside rear view mirror, etc.)
    

The pre-crash safety system may be temporarily unavailable or there may be a malfunction in the system.

In the following situations, the warning light will turn off, the message will disappear and the system will become operational when normal operating conditions return:

1. When the millimeter wave radar sensor assembly or forward recognition camera or the area around either sensor is hot, such as in the sun
   
2. When the millimeter wave radar sensor assembly or forward recognition camera or the area around either sensor is cold, such as in an extremely cold environment
   
3. When the millimeter wave radar sensor assembly or front grille emblem is dirty or covered with snow, etc.
   
4. If the forward recognition camera is obstructed, such as when the hood is open or a sticker is attached to the windshield near the forward recognition camera
   

If VSC is disabled, the pre-crash brake assist and pre-crash brake functions are also disabled.

The PCS warning light will turn on and "VSC Turned Off Pre-crash Brake System Unavailable" will be displayed on the multi-information display.