Lexus IS250 2009, Service Manual

Page: 192 / 542

192
2-4. Using other driving systems
PCS (Pre-Collision System)
∗
Radar sensor
Detects vehicles or other obsta-
cles on or near the road ahead and
determines whether a collision is
imminent based on the position,
speed, and heading of the obsta-
cles.
Grille cover
Radar sensor
Safety systems such as the brakes and seat belts are automatically
engaged to lessen impact and injuries to occupants as well as vehicle dam-
age when the radar sensor detects an unavoidable frontal collision.
n
Pre-collision seat belts
The seat belts are immediately retracted to provide the driver and passen-
gers with enhanced pretensioner effectiveness in a collision. (
→
P. 57) In
the event of sudden braking or skidding, the system will operate even if no
obstacle has been detected.
n
Pre-collision brake assist
Applies greater braking force in relation to how strongly the brake pedal is
depressed.
n
Obstacles not detected
The sensor cannot detect plastic obstacles such as pylons. There may also be occa-
sions when the sensor cannot detect pedestrians, animals, bicycles, motorcycles,
trees, or snowdrifts.
∗
: If equipped