258
4-5. Using the driving support systems
cally canceled for any reasons other than
the above, there may be a malfunction in
the system. Contact any authorized Lexus
retailer or Lexus authorized repairer, or any
reliable repairer.
Q The Dynamic Radar Cruise Control
with Road Sign Assist may not operate
properly when
As the Dynamic Radar Cruise Control with
Road Sign Assist may not operate properly
in conditions in which RSA may not operate
or detect correctly (P.247), when using
this function, make sure to check the speed
limit sign displayed.
In the following situations, the set speed
may not be changed to the recognized
speed limit by pressing and holding the
“+RES”/“-SET” switch.
O If speed limit information is not available
O When the recognized speed limit is the
same as the set speed
O When the recognized speed limit is out-
side of the speed range that the dynamic
radar cruise control system can operate
Q Situations in which the curve speed
reduction function may not operate
In situations such as the following, the curve
speed reduction function may not operate:
O When the vehicle is being driven around
a gentle curve.
O When the accelerator pedal is being
depressed.
O When the vehicle is being driven around
an extremely short curve.
Q Brake operation
A brake operation sound may be heard and
the brake pedal response may change, but
these are not malfunctions.
Q Warning messages and buzzers for
dynamic radar cruise control with full-
speed range
Warning messages and buzzers are used to
indicate a system malfunction or to inform
the driver of the need for caution while driv-
ing. If a warning message is shown on the
multi-information display, read the message
and follow the instructions. (P.222, 415)
Q When the sensor may not be correctly
detecting the vehicle ahead
In the case of the following and depending
on the conditions, operate the brake pedal
when deceleration of the system is insuffi-
cient or operate the accelerator pedal
when acceleration is required.
As the sensor may not be able to correctly
detect these types of vehicles, the approach
warning (P.254) may not be activated.
O Vehicles that cut in suddenly
O Vehicles traveling at low speeds
O Vehicles that are not moving in the same
lane
O Vehicles with small rear ends (trailers
with no load on board, etc.)
O Motorcycles traveling in the same lane
O When water or snow thrown up by the
surrounding vehicles hinders the detect-
ing of the sensor
O When your vehicle is pointing upwards
(caused by a heavy load in the luggage
compartment, etc.)
O Preceding vehicle has an extremely high
ground clearance
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