Lexus RX 450h Owner's Manual page 308

306 4-5. Using the driving support systems
• The vehicle is being driven in the center
of a lane.
• Steering assist function is not operating.
Temporary cancelation of functions
■
When operation conditions are no longer
●
met, a function may be temporarily
canceled. However, when the operation
conditions are met again, operation of the
function is automatically restored.
(P.305)
If the operation conditions (P.305) are
●
no longer met while the lane centering
function is operating, the steering wheel
may vibrate and the buzzer may sound to
indicate that the function has been tem-
porarily canceled. However, if the "Alert"
customization setting is set to
the system will notify the driver by vibrat-
ing the steering wheel instead of sound-
ing the buzzer.
Steering assist function/lane centering
■
function
Depending on the vehicle speed, lane
●
departure situation, road conditions, etc.,
the driver may not feel the function is
operating or the function may not oper-
ate at all.
The steering control of the function is
●
overridden by the driver's steering wheel
operation.
Do not attempt to test the operation of
●
the steering assist function.
Lane departure alert function
■
The warning buzzer may be difficult to
●
hear due to external noise, audio play-
back, etc. Also, it may be difficult to feel
steering wheel vibrations due to the road
conditions, etc.
If the edge of the course
●
straight, the lane departure alert function
may not operate.
Vehicle with BSM: It may not be possible
●
for the system to determine if there is a
danger of a collision with a vehicle in an
adjacent lane.
Do not attempt to test the operation of
●
the lane departure alert function.
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*
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
Hands off steering wheel warning
■
In the following situations, a warning mes-
sage urging the driver to hold the steering
wheel and the symbol shown in the illustra-
tion are displayed on the multi-information
display to warn the driver. The warning
stops when the system determines that the
driver holds the steering wheel. Always
keep your hands on the steering wheel
when using this system, regardless of warn-
ings.
,
When the system determines that the
●
driver is driving without holding the steer-
ing wheel while the system is operating
If the driver continues to keep their hands
off of the steering wheel, the buzzer
sounds, the driver is warned and the func-
tion is temporarily canceled. This warning
also operates in the same way when the
driver continuously operates the steering
wheel only a small amount.
The buzzer also sounds even if the alert
type is set to
When the system determines that the
●
vehicle may not turn and instead depart
from its lane while driving around a curve
* Depending on the vehicle condition and
is not clear or
road conditions, the warning may not
operate. Also, if the system determines that
the vehicle is driving around a curve, warn-
ings will occur earlier than during
straight-lane driving.
When the system determines that the
●
driver is driving without holding the steer-
ing wheel while the steering wheel assist
.