2005 Lexus LS 430 Owners Manual - Page 416

STARTING AND DRIVING Pre−collision brake assist system When the pre −collision sensor detects an object or vehicle with which your vehicle might collide, and determines that a collision may be unavoidable, depressing the brake pedal provides more powerful braking according to the amount of pedal depression. The pre−collision brake assist system will operate in the following conditions: D When the ignition switch is turned on. D When the approaching speed in regard to the object or the vehicle exceeds about 30 km/h (18 mph). D When the brake pedal is depressed. If the brake pedal is kept depressed before the sensor's determination of unavoidable collision, the pre−collision brake assist system will operate soon after the sensor 's determination. Electronically modulated air suspension control When the pre −collision sensor detects an object or vehicle with which your vehicle may collide, and determines that a collision may be unavoidable, the electronically modulated air suspension adjusts the damping effect on the shock absorbers and regulates the vehicle not to pitch forward so much. The electronically modulated air suspension will operate in the following conditions: D When the ignition switch is turned on. D When the vehicle speed is about 5 km/h (3 mph) or over. D When the approaching speed in regard to the object or the vehicle exceeds about 30 km/h (18 mph). 377