2011 Lexus HS 250h Owners Manual - Page 239

2-4. Using other driving systems Pre-Collision System∗ When the radar sensor detects possibility of a frontal collision, the pre-collision system such as the brakes and seat belts are automatically engaged to lessen impact and injuries to occupants as well as vehicle damage. n Pre-collision seat belts (front seat belts only) 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. 75) However, when the VSC system is disabled, the system will not operate in the event of skidding. 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. Pre-collision braking can be disabled using the pre-collision braking off switch. *: When the pre-collision braking system activates, "BRAKE!" will appear on the multi-information display and head-up display (if equipped), and the warning light will begin flashing rapidly. (→P. 514) n Driver monitor system (if equipped) When the system determines that there is a possibility of a frontal collision, and the driver is not facing forward, PCS warnings are given in advance to warn the driver. If the driver continues to be not facing forward, and a high possibility of a frontal collision is detected, PCS informs the driver of high possibility of a frontal collision by performing slight braking to provide a physically warning (pre-collision alert braking). (→P. 238) ∗: If equipped 236