Lexus GS430 User Manual page 400

STARTING AND DRIVING
The selector lever must be in any position other than "P" or "R"
for these sensors to operate, however the obstacle at an angle
to the front of the vehicle will also be detected while the selector
lever is in "R".
CAUTION
With long obstacles such as walls, the decision of the
sensor may change as the obstacle gets closer; from
certain avoidance to avoidance if steering is changed;
from certain avoidance to unavoidable collision; and
there are also times when the decision will be changed
from avoidance if steering is changed, to certain
collision. When you move your vehicle, be sure to
confirm a safe distance around your vehicle with your
eyes and drive slowly, or an accident or injury may
result.
The steering guidance may not operate properly in the
following conditions:
D Tires other than those of Lexus genuine size are
installed.
D The steering sensor information cannot be received
properly. (See "Intuitive parking assist failure warning"
on page 385.)
376
(A) Collision will be unavoidable
G31055
" 3 About 50 cm (1.5 ft.) to about 100 cm (3.0 ft.)
4 About 37.5 cm (1.1 ft.) to about 50 cm (1.5 ft.)
5 About 25 cm (0.8 ft.) to about 37.5 cm (1.1 ft.)
6 Less than about 25 cm (0.8 ft.)