Lexus 2003 LS Owner's Manual page 76

GAUGES, METERS AND SERVICE REMINDER INDICATORS
The system will illuminate the following display:
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If the system cannot
vehicle–to–vehicle distance because of the following
conditions while the dynamic laser cruise control is on,
the master warning light comes on and the "CRUISE"
indicator light flashes, the above message appears and a
warning tone sounds.
A The wipers are operated at high or low speeds
A Direct sunlight from the front
A The driving pattern selector switch is set to the "SNOW"
mode.
A It is determined that it is difficult to make a measurement
because of bad weather (such as rainy, foggy, or snowy
weather)
In the following cases, the dynamic laser cruise control
switches to the "RADAR READY" mode:
A The wipers are stopped or are switched to intermittent
operation. (Including intermittent and stopped wipers in the
"AUTO" position)
A No direct sunlight from the front
A The driving pattern selector switch is changed to the
"Normal" or "Power" position.
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easily measure the
In the above conditions, press the control lever upward in the
"RES/ACC" direction and release it. The dynamic laser cruise
control will be restored, however, even after the weather
clears, if the setting operation cannot be performed or if the
warning message still appears, the system might have
malfunctioned.
Although it is no problem to continue driving, contact your
Lexus dealer.
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If a system malfunction is detected when dynamic laser
cruise control is in the "RADAR READY" mode or
operating, the master warning light comes on, the above
message appears and a warning tone sounds.
If this message appears, stop your vehicle in a safe place, turn
the ignition off, and then restart it to reset the system. If the
setting still cannot be made or the same message appears
again, the system might have malfunctioned. Although it is no
problem to continue driving, contact your Lexus dealer.