Lexus GS430 User Manual page 408

STARTING AND DRIVING
D Devices issuing ultrasonic waves are operated around your
vehicle, such as a horn from another vehicle, motorcycle
engine, air braking sound from heavy−duty vehicles.
D When another vehicle equipped with ultrasonic sensors
gets close to your vehicle.
D When heavy rain or water is splashed over the vehicle.
(Drive carefully as the braking distance may be affected.)
D When a radio antenna or fender pole is mounted on your
vehicle.
D If towing eyelet is installed on your vehicle.
D When you are driving towards a tall curb stone or curb stone
having right angle.
D The detection range for an object such as a traffic sign may
be shortened.
D An object just under the bumper cannot be detected.
Although an object lower than the location of sensors is
once detected, the detection might be stopped when your
vehicle gets closer to the object.
D When an obstacle is very close to the sensors.
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The intuitive parking assist may not detect the following:
D Thin objects such as wire or rope
D Sound wave absorbing objects such as cotton or snow
D Objects with a sharp edge
D Tall objects with the upper part projected
D Shorter objects