Lexus 2004 LS430 Owner's Manual page 370

STARTING AND DRIVING
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Dynamic radar cruise control—
If the system cannot
vehicle-to-vehicle distance because of a dirty millimeter
wave radar sensor or grille cover while the dynamic radar
cruise control is on, the above message appears.
If this message appears, clean the sensor and grille cover 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.
Dynamic laser cruise control—
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 above message appears.
If this message appears, 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.
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If the
vehicle- to- vehicle distance because of the following
easily measure the
conditions while the dynamic radar/laser cruise control is
on, the above message appears.
Dynamic radar cruise control—
D The driving pattern selector switch is set to the "SNOW"
mode.
D It is determined that it is difficult to make a measurement
because of bad weather (such as extremely hot weather)
D The wipers are operated at high speed with the wiper lever
in the "AUTO" position
Dynamic laser cruise control—
D The driving pattern selector switch is set to the "SNOW"
easily measure the mode.
D It is determined that it is difficult to make a measurement
because of bad weather (such as rainy, foggy, or snowy
weather)
D The wipers are operated at high or low speeds with the
wiper lever in the "AUTO" position.
D Direct sunlight from the front
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system cannot easily measure the