Lexus 2003 LS Owner's Manual page 261

Lexus park assist system operating hints
31L290

Sensor detection range
1 About 1 m (3 ft.) 2 About 50 cm (1.5 ft.)
The sensor detection range is limited around the bumper.
Be sure to confirm a safe distance around your vehicle
and drive slowly.
If more than one obstacle is detected in the same
direction, the indicators for the obstacle nearest to the
vehicle will turn on.
STARTING AND DRIVING
CAUTION
Do not install an accessory or the like within the sensor
detection range. Doing so may cause the Lexus park
assist system to malfunction, resulting in an accident.
NOTICE
A The sensors do not detect an obstacle just under the
bumper. A short object, thin stake or the like will be
detected once but might not be detected as your
vehicle gets very close to such an object.
A If an obstacle is very close to your vehicle, it might
not be detected.
A If a sensor is subjected to a strong impact, it will not
operate properly.
The Lexus park assist system may not work properly in
the following cases:
A When icicles, snowflakes or mud gets on the sensors.
If removed, the system will work properly.
A When the sensor is frozen.
If deiced, the system will work properly.
A When the sensor is covered with something.
If removed, the system will work properly.
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