4-5. Using the driving support systems
• The driver is not wearing a seat belt.
• The driver’s door is opened.
• The vehicle has been stopped for about 3
minutes
If vehicle-to-vehicle distance control mode
is automatically canceled for any reasons
other than the above, there may be a mal-
function in the system. Contact your Lexus
dealer.
Q Automatic cancelation of constant
speed control mode
Constant speed control mode is automati-
cally canceled in the following situations:
O Actual vehicle speed is more than
approximately 16 km/h (10 mph) below
the set vehicle speed.
O Actual vehicle speed falls below approxi-
mately 30 km/h (20 mph).
O VSC is activated.
O Active TRC is activated for a period of
time.
O When the VSC or Active TRC system is
turned off.
O When the brake control or output
restriction control of a driving support
system operates.
(For example: Pre-Collision System,
Drive-Start Control)
O The center differential lock/unlock is not
completed within 5 seconds while the
cruise control system is on.
O The parking brake is operated.
If constant speed control mode is automati-
cally canceled for any reasons other than
the above, there may be a malfunction in
the system. Contact your Lexus dealer.
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. (oP.260, 592)
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 (oP.289) 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
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