Lexus 2003 LS Owner's Manual page 260

STARTING AND DRIVING
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.
246
Malfunction warning
31L171a
If a sensor malfunctions, a beep sounds for about 7
seconds and blinking indicators show which sensor is not
working properly.
If the above screen appears on the display, the following
causes are suspected.
A The sensor is malfunctioning or a cable has broken.
A Icicles, snowflakes or mud gets on the sensor.
The sensors operate individually. When one sensor is
malfunctioning, sounding beeps and blinking indicators to
show that it is malfunctioning, if another sensor detects an
obstacle during this time, the approximate distance to the
obstacle will be shown by that sensor.