Toyota LEXUS LS430 2005 Manual page 336

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You can use this system in either of the following ways.
D Push the main switch of the Lexus park assist system with
the ignition on. A beep sounds for one second. After the
system self−check is performed, the Lexus park assist
system screen appears for 2 seconds.
D Push the main switch of the Lexus park assist system and
turn the ignition on. The Lexus park assist system screen
appears for 2 seconds and a system self−check is
performed. At this time, a beep does not sound.
If an error is detected in the Lexus park assist system while
self−checking, beeps sound and the message appears in the
multi−information display. For details, see "Lexus park assist
system failure warning" on page 319.
STARTING AND DRIVING
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.
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