PRE-CRASH SAFETY SYSTEM

Info Added 2017-07-26


  1. OUTLINE


    1. Lexus Safety System+


      1. Preventive safety package "Lexus Safety System+" has been adopted to support the safety drive.

      2. System that are included in the "Lexus Safety System+" are as follows:


        • PCS (Pre-crash Safety System)

        • LDA (Lane Departure Alert with steering control) Click here

        • AHB (Automatic High Beam) Click here

    2. Pre-Crash Safety System (PCS)


      1. Pre-crash safety system lessens the damage sustained in a collision by operating in unison with warning device and brake systems.

      2. The pre-crash safety system detects the vehicle in front of the vehicle based on both data from a monocular camera and millimeter wave radar sensor.

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  2. PRECAUTION


    1. Lexus Safety System+


      1. The Lexus Safety System+, is designed to operate under the assumption that the driver will drive safely, and is designed to avoid the collision or help reduce the impact to the occupants and the vehicle in the case of a collision.

      2. As there is a limit to the degree of recognition accuracy and control performance that this system can provide, do not overly rely on this system. The driver is always responsible for paying attention to the vehicle's surroundings and driving safely

    2. Limitations of the pre-crash safety system


      1. The driver is solely responsible for safe driving. Always drive safely, taking care to observe your surroundings.

        Do not use the pre-crash safety system instead of normal braking operations under any circumstances. This system will not prevent collisions or lessen damage or injuries in every situation. Do not overly rely on this system. Failure to do so may lead to an accident, resulting in death or serious injury.

      2. Although this system is designed to help avoid and reduce the impact of a collision, its effectiveness may change according to various conditions, therefore the system may not always be able to achieve the same level of performance.

        Read the following conditions carefully. Do not overly rely on this system and always drive carefully.

    3. Pre-crash braking


      1. The pre-crash braking function may not operate if certain operations are performed by the driver. 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 braking function from operating.

      2. In some situations, while the pre-crash braking function is operating, operation of the function may be canceled if the accelerator pedal is depressed strongly or the steering wheel is turned and the system determines that the driver is taking evasive action.

      3. A large amount of braking force is applied while the pre-crash braking function is operating. Additionally, as the vehicle may creep after the pre-crash braking function has operated, the driver should depress the brake pedal as necessary.

    4. When to disable the pre-crash safety system


      1. If the following situations, disable the system, as it may not operate properly, possibly leading to an accident:


        • When the vehicle is being towed

        • When your vehicle is towing another vehicle

        • When transporting the vehicle via truck, boat, train or similar means of transportation

        • When the vehicle is raised on a lift with the engine switch on and the tires are allowed to rotate freely

        • When inspecting the vehicle using a drum tester such as a chassis dynamometer or speedometer tester, or when using an on vehicle wheel balancer

        • When a strong impact is applied to the front bumper or front grille, due to an accident or other reasons

        • If the vehicle cannot be driven in a stable manner, such as when the vehicle has been in an accident or is malfunction

        • When the vehicle is driven in a sporty manner or off-road

        • When the tires are not properly inflated

        • When the tires are very worn

        • When tires of a size other than specified are installed

        • When tire chains are installed

        • When a compact spare tire or an emergency tire puncture repair kit is used

        • If the suspension is modified

        • If the front of the vehicle is raised or lowered, such as when loaded with heavy luggage

    5. Situations in which the system may not operate properly


      1. The following objects may not be detected by the radar sensor and camera sensor, preventing the system from operating properly:


        • Glass windows, mirrors, walls, gates, fences, shutters, or similar objects

        • Guardrails, utility poles, trees, or similar objects

        • Livestock or other animals

        • Objects which have fallen onto the road

      2. The following vehicles may not be detected by the radar sensor and camera sensor, preventing the system from operating properly:


        • Motorcycles, side cars, and other vehicles with a small rear end

        • Low bed trailers or other vehicles with a low rear end

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        • Vehicles with extremely high ground clearance

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        • Irregularly shaped vehicles, such as unloaded car transporters, unloaded tractor trailers, or similar vehicles

        • Vehicles that cut in front of your vehicle or emerges from beside a vehicle

        • A preceding vehicle that makes an abrupt maneuver (such as sudden swerving, acceleration or deceleration)

        • Vehicles that cross the front of your vehicle

        • Vehicles parked laterally to your vehicle

        • Vehicles that are within approximately 6.5 ft. (2 m) of the front of your vehicle

      3. In the following situations, a vehicle may not be detected, preventing the system from operating properly:


        • When driving in inclement weather such as heavy rain, fog, snow or a sand storm

        • When the vehicle is hit by water, snow, dust, etc. from a preceding vehicle or oncoming vehicle

        • When driving through fog, steam or smoke

        • When a very bright light, such as the sun or the headlights of oncoming traffic, shines directly into the camera sensor

        • When the surrounding area is dim, such as at dawn or dusk

        • When the surrounding area is dark, such as at night or while in a tunnel, and the headlights of your vehicle are not turned on

        • When the surrounding area is dark, such as at night or while in a tunnel, and the taillights of a preceding vehicle are not turned on

        • When driving on a sharp curve

        • When driving on a hill

        • When the road surface is rough or uneven, such as an undulating or unpaved road

        • When the brakes are cold, such as when the ambient temperature is low or immediately after starting the vehicle

        • When the area around the camera sensor is hot, such as after the vehicle has been parked in the sun

      4. Due to the limitations of the radar sensor, camera sensor and system, the system may not operate properly in the following situations:


        • When a preceding vehicle is not directly in front of your vehicle

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        • After the hybrid system has started the vehicle has not been for a certain amount of time.

        • While or after making a left/right turn the vehicle has not been driven for a certain amount of time

        • When cutting immediately behind a preceding vehicle

        • If your vehicle is skidding

      5. In the following situations the system may not function properly:


        • The vehicle is wobbling.

        • The vehicle is being driven at high speeds.

        • The vehicle is backing up.

        • The steering wheel is being turned.

        • The accelerator pedal is being depressed strongly.

        • The brake pedal is being depressed.

      6. In the following situations, the functions of the system may not operate to their full extent:


        • When driving in a place where the surrounding brightness changes suddenly, such as at the entrance or exit of a tunnel

        • If the front of the vehicle is raised or lowered, such as when heavy luggage is loaded

        • When towing a trailer or another vehicle

        • If the suspension is modified

        • When the brakes are overheated and do not operate properly (such as after driving down a long grade or mountain)

        • When the brakes are wet, due to driving through standing water, washing the vehicle, etc., and do not operate properly

        • If the vehicle is not properly maintained (brakes or tires are excessively worn, improper tire inflation pressure, etc.)

        • If the wheels are misaligned

        • When the windshield is fogged up

        • If the windshield is dirty or covered with an oily film, water droplets, snow, ice, or frost, blocking the vision of the camera sensor

        • If a wiper blade is blocking the camera sensor

        • If the area of the windshield around the camera sensor has been hit by a stone, etc. and damaged

        • When the camera sensor is obstructed (for example, if a canoe is mounted on the roof)

        • When the vehicle is driving on a slippery surface

    6. To avoid malfunction of the camera sensor


      1. Observe the following precautions.

      2. Otherwise, the camera sensor may not operate properly, possibly leading to an accident resulting in death or serious injury.


        • Keep the windshield clean all times.

          If the windshield is dirty or covered with an oily film, water droplets, snow, etc., clear the windshield.

          If the inner side of the windshield where the camera sensor is installed is dirty, contact your Lexus dealer

        • Do not install antennas or attach stickers (including transparent stickers) or other items in front of the windshield camera sensor (shaded area in the illustration).

        • Do not attach window tinting to the windshield.

        • If the part of the windshield in front of the camera sensor is fogged up or covered with condensation or ice, use the windshield defogger to remove the fog, condensation or ice.

        • If the windshield needs to be replaced, replace it with a regular parts number.

        • Do not spill liquid onto the camera sensor.

        • Do not allow bright lights to shine into the camera sensor.

        • Do not dirty or damage the camera sensor.

          When cleaning the inside of the windshield, do not allow glass cleaner to contact the lenses. Also, do not touch the lenses.

        • Do not subject the camera sensor to a strong impact.

        • Do not change the installation position or direction of the camera sensor or remove it. The direction of the camera sensor is precisely adjusted.

        • Do not disassemble the camera sensor.

        • Do not install an electronic device or device that emits strong electric waves near the camera sensor.

    7. If the PCS warning light flashes and a warning message is displayed on the multi-information display


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

      2. 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:


        • When the area around the camera sensor is hot, such as after the vehicle has been parked in the sun

        • When the radar sensor or front grille is dirty

        • If the windshield is dirty or covered with an oily film, water droplets, snow, ice, or frost

        • If the area in front of the camera sensor is obstructed, such as when the hood is open

      3. If the PCS warning light continues to flash or the warning message does not disappear, the system may be malfunctioning.

    8. If VSC is disabled


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

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