Lexus GS430 User Manual page 475

Pre−collision seat belts (Front seat belts only)
When the pre−collision sensor detects an object or
vehicle with which your vehicle might collide and
determines that a collision may be unavoidable, the seat
belts are quickly drawn back by the retractors to enhance
the effects of the seat belt pretensioners.
pre−collision seat belts also work as well when hard
braking.
The pre−collision seat belts will operate in the following
conditions:
D When the approaching speed in regard to the object or the
vehicle exceeds about 30 km/h (18 mph).
D When the front seat occupants wear the seat belts.
In the following conditions, the seat belts are quickly drawn
back by the retractors regardless of the possibility of the
collision:
D When the vehicle is spinning or cannot take a turn properly
at more than about 15 km/h (10 mph).
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
The braking according to the amount of pedal depression.
The pre−collision brake assist system will operate when the
following all conditions are met.
D When the vehicle speed is about 30 km/h (18 mph) or over.
D When the brake pedal is depressed.
D When the approaching speed in regard to the object or the
vehicle exceeds about 30 km/h (18 mph).
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.
STARTING AND DRIVING
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