Lexus 2004 LS430 Owner's Manual page 335

Up to 4 indicator bars are shown on the front and rear sides of
the vehicle mark and up to 3 indicator arcs are shown on each
corner of the vehicle mark. The number of indicators shows
the approximate range up to the obstacle. The indicator marks
disappear one-by-one as your vehicle comes closer to the
obstacle. Also, as you get closer to the obstacle, the beeping
interval becomes shorter.
To turn off the system, push the main switch again.
NOTICE
D If an accident should occur, the sensors will be
affected, resulting in a system failure.
D If the indicators remain on the display but you do not
hear a beeping sound, the system may be
malfunctioning. Contact your Lexus dealer.
STARTING AND DRIVING
Indicators and beeps
34L148b
" Front or rear obstacles
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 .
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