2008 Lexus LS 460 Owners Manual - Page 284

2-4. Using other driving systems Pre-Collision System with camera sensor (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. 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 button. (→P. 219) n Suspension control When the system determines that a collision is unavoidable, the suspension switches to "SPORT" mode to help prevent the front of the vehicle from dropping when the brakes are applied suddenly n Steering gear control (VGRS) When the system determines that a collision is unavoidable, the steering gear ratio is changed to help improve the response to steering input n Driver monitor system When the system determines that there is a possibility of a collision, and the driver is not facing forward, PCS warnings are given in advance to warn the driver. In some circumstances, the brakes will be applied briefly to give a sensory warning to the driver (pre-collision alert braking). (→P. 220) 218