2008 Lexus LX 570 Owners Manual - Page 331

2-4. Using other driving systems Pre-Collision System (if equipped) Safety systems such as the brakes and seat belts are automatically engaged to lessen impact and injuries to occupants as well as vehicle damage when the radar sensor detects an unavoidable frontal collision. n Pre-collision seat belts (front seats only) The seat belts are immediately retracted as the effect of the pretensioner is increased (→P. 88), to help prepare the driver and passengers. In the event of sudden braking or skidding, the system will operate even if no obstacle has been detected. 2 n Pre-collision brake assist Applies greater braking force in relation to how strongly the brake pedal is depressed. When driving n Pre-collision AVS If the system determines that the collision is unavoidable, the operation of AVS (→P. 246) helps prevent the vehicle front from going down when hard brakes are applied. Radar sensor Detects vehicles or other obstacles on or near the road ahead and determines whether a collision is imminent based on the position, speed, and heading of the obstacles. When traveling on a road with very light traffic and very little to reflect the radar waves emitted by the radar sensor, the system may decide that the radar sensor is dirty, even if the sensor is not actually dirty. The system will automatically restore itself when reflected radar waves are detected. 265