2011 Lexus IS 350 User Guide - Page 207

2-4. Using other driving systems PCS (Pre-Collision System)∗ When the radar sensor detects possibility of a frontal collision, the pre-collision systems such as the brakes and seat belts are automatically engaged in an attempt to lessen damage. n Pre-collision seat belts If the pre-collision sensor detects that a collision is unavoidable, the precollision system will retract the seat belt before the collision occurs. The same will happen if the driver makes an emergency braking or loses control of the vehicle. (→P. 68) However, the system will not operate in the event of skidding when the VSC systems are disabled. n Pre-collision brake assist When there is a high possibility of a frontal collision, the system applies greater braking force in relation to how strongly the brake pedal is depressed. n Pre-collision braking When there is a high possibility of a frontal collision, the system warns the driver using a warning light, warning display and buzzer. If the system determines that a collision is unavoidable, the brakes are automatically applied to reduce the collision speed. The pre-collision braking function can be turned on and off using the satellite switch. ∗: If equipped 214