2009 Lexus IS 350 Owners Manual - Page 192

2-4. Using other driving systems PCS (Pre-Collision System)∗ 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 seat belts are immediately retracted to provide the driver and passengers with enhanced pretensioner effectiveness in a collision. (→P. 57) In the event of sudden braking or skidding, the system will operate even if no obstacle has been detected. 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. Grille cover Radar sensor 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. ∗: If equipped 192