Lexus LS460 2011 Owner's Manual page 370

2-4. Using other driving systems
When the radar sensor detects possibility of a frontal collision, the pre-
crash safety system such as the brakes and seat belts are automatically
engaged to lessen impact and injuries to occupants as well as vehicle
damage.

Pre-crash seat belts (front seats)
If the pre-crash sensor detects that a collision is unavoidable, the
pre-crash safety 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.
However, the system will not operate in the event of skidding when
the VSC system is disabled.

Pre-crash 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.

Pre-crash 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 help reduce the collision speed. Pre-
crash braking function can be turned on and off using the pre-crash
braking off switch. (P. 355)

Suspension control (if equipped)
When it has been determined that there is a high possibility of a col-
lision, suspension firmness is adjusted appropriately.

Driver monitor system (if equipped)
When the system determines that there is a possibility of a collision
and that the driver is not facing forward, a warning will be issued at
an earlier stage, promptly informing the driver of danger. If the situ-
ation does not improve, the brakes will be applied briefly to give the
driver a sensory warning (pre-crash alert braking), encouraging the
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