Lexus 2004 LS430 Owner's Manual page 336

STARTING AND DRIVING
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.
316
31L149b
" Corner obstacles
Depending on the distance between your vehicle and the
obstacle, the display and beeps change as follows:
1 About 37.5 cm (1.1 ft.) to about 50 cm (1.5 ft.): 3 arcs
appear on the corner of the vehicle mark where the
obstacle is detected. At this time, the beeps remind you
that your vehicle is getting closer to the obstacle by
sounding intermittently.
2 About 25 cm (0.8 ft.) to about 37.5 cm (1.1 ft.): The
number of arcs will decrease from 3 to 2. The beeps
sound at shorter intervals than in step 1 .
3 Less than about 25 cm (0.8 ft.): The number of arcs will
decrease from 2 to 1, and the bar blinks while the beeps
sound continuously.