Lexus 2003 LS Owner's Manual page 270

STARTING AND DRIVING
When vehicle–to–vehicle distance control mode is activated,
you must still be attentive to road and traffic conditions. Should
your vehicle speed decrease below about 40 km/h (25 mph),
the dynamic laser cruise control will shut off, requiring you to
apply the brakes to slow. When a vehicle ahead slows
suddenly, stops or a vehicle cuts in front, the system may slow
your vehicle abruptly, but the automatic braking will cease if the
speed decreases below about 40 km/h (25 mph) requiring the
driver's manual application of brakes.
CAUTION
Certain conditions make vehicle detection difficult or
impossible.
A As this system operates by detecting primarily the
reflectors of the vehicle ahead, the distance cannot
be accurately detected in the following cases,
resulting in improper vehicle–to–vehicle distance.
A The vehicle ahead has higher ground clearance,
which means that the placement of the reflectors
is in a higher position.
A The rear section of the vehicle ahead is extremely
dirty.
A The vehicle ahead or other vehicles around you
are flinging up water or snow.
A Excessive exhaust gas (black smoke) is coming
from the vehicle ahead or other vehicles around
you, obscuring your front view.
256
A Protective film is attached to the reflectors on the
vehicle ahead, or reflectors are not installed on the
vehicle ahead or are damaged.
A Heavy luggage which is loaded in your trunk or on
top of your rear seats is raising up the nose of your
vehicle.
A The laser radar sensor automatically detects dirt if
dirt is sticking to the sensor glass of your vehicle, and
if detected, a message
multi–information display.
sensor is covered with a transparent or translucent
vinyl bag, icicle, etc., dirt may not be detected,
resulting in improper vehicle–to–vehicle distance.
Continue driving with due care to the vehicle ahead.
If dirt is detected, the dynamic laser cruise control
function is automatically cancelled. Always keep the
sensor glass clean.
is shown on the
However, if the glass