Lexus 2003 LS Owner's Manual page 282

STARTING AND DRIVING
Vehicle–to–vehicle distance control mode
failure warning
31L165g
If there is trouble somewhere in the dynamic laser cruise
control while the vehicle–to–vehicle distance control mode is
on, the "CRUISE" indicator light in the instrument cluster
flashes, the master warning light comes on and the warning
tone sounds, and one or more of the following warning
messages will appear on the multi–information display.
A "CLEAN RADAR SENSOR"
A "CRUISE NOT AVAILABLE"
A "CHECK CRUISE SYSTEM"
If any warning message shown above appears, the preset
speed automatically cancels out. Although it is no problem to
continue driving, contact your Lexus dealer.
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If the system cannot
vehicle–to–vehicle distance because of a dirty laser radar
sensor glass while the dynamic laser cruise control is on,
the master warning light comes on and the "CRUISE"
indicator light flashes, the following message appears
and a warning tone sounds.
If this message appears on the screen, clean the sensor glass
with a soft cloth and try setting the preset speed again. If the
dirt is removed without cleaning, the system will automatically
enter the "RADAR READY" mode. If the system does not enter
the "RADAR READY" mode even after cleaning or the
message remains on the display, the system might be
malfunctioning. Although it is no problem to continue driving,
contact your Lexus dealer.
easily measure the