Lexus 2003 LS Owner's Manual page 259

NOTICE
A If an accident should occur, the sensors will be
affected, resulting in a system failure.
A If the indicators remain on the display but you do not
hear a beeping sound, the system may be
malfunctioning. Contact your Lexus dealer.
Indicators and beeps
34L148b

Front or rear obstacles
STARTING AND DRIVING
Depending on the distance between your vehicle and the
obstacle, the display and beeps change as follows:
1
About 50 cm (1.5 ft.) to about 100 cm (3.0 ft.)*: 4 bars
appear on the front or rear side of the vehicle mark where
the obstacle is detected. If the obstacle is detected on the
rear side of the vehicle, the beeps remind you that your
vehicle is getting closer to the obstacle by sounding
intermittently.
2 About 37.5 cm (1.1 ft.) to about 50 cm (1.5 ft.): The
number of bars will decrease from 4 to 3, and the beeps
sound at shorter intervals than in step 1 .
3
About 25 cm (0.8 ft.) to about 37.5 cm (1.1 ft.): The
number of bars will decrease from 3 to 2. The beeps
sound at shorter intervals than in step 2 .
4
Less than about 25 cm (0.8 ft.): The number of bars will
decrease from 2 to 1, and the bar blinks while the beeps
sound continuously.
NOTE: *The beeps can be activated or deactivated. Ask
your Lexus dealer for details.
245