2008 Lexus LS 460 Owners Manual - Page 281

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 The front seat belts are immediately retracted as the effect of the pretensioner is increased (→P. 79) to help prepare the driver and front passenger. In the event of sudden braking or skidding, the system will operate even if no obstacle has been detected. However, the system will not operate in the event of skidding when the TRAC/VSC systems are disabled. 2 When driving n Pre-collision brake assist Applies greater braking force in relation to how strongly the brake pedal is depressed. 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. n Obstacles not detected The sensor cannot detect plastic obstacles such as pylons. There may also be occasions when the sensor cannot detect pedestrians, animals, bicycles, motorcycles, trees, or snowdrifts. 215