2021 Lexus LC500C wheel

1864-5. Using the driving support systems
■Lane departure alert function
When the system determines that the
vehicle might depart from its lane, a
warning is displayed on the multi-infor-
mation display, and either the warning
buzzer sounds to alert the driver.
When the warning buzzer sounds, check
the surrounding road situation and care- fully operate the steering wheel to move
the vehicle back to the center of the lane.
■Steering assist function
When the system determines that the
vehicle might depart from its lane, the
system provides assistance as neces-
sary by operating the steering wheel in
small amounts for a short period of
time to keep the vehicle in its lane.
If the system detects that the steering
wheel has not been operated for a fixed
amount of time or the steering wheel is not
being firmly gripped, a warning is dis-
played on the multi-information display
and the warning buzzer sounds.
LKA (Lane-Keeping Assist)
When driving on highways and
freeways with white or yellow lines,
this function alerts the driver when
the vehicle might depart from its
lane and provides assistance by
operating the steering wheel to
keep the vehicle in its lane. Further-
more, the system also provides
steering assistance when dynamic
radar cruise control with full-speed
range is operating to keep the vehi-
cle in its lane.
The LKA system recognizes visible
white or yellow lines with the front
camera on the upper portion of the
front windshield.
Functions included in LKA sys-
tem

1874-5. Using the driving support systems
4
Driving■Vehicle sway warning function
When the vehicle is swaying or
appears as if it may depart from its lane
multiple times, the warning buzzer
sounds and a message is displayed on
the multi-information display to alert
the driver.
■Lane centering function
This function is linked with radar cruise
control and provides the required
assistance by operating the steering
wheel to keep the vehicle in its current
lane.
When radar cruise control is not operat-
ing, the lane centering function does not
operate.
If the system detects that the steering
wheel has not been operated for a fixed
amount of time or the steering wheel is not
being firmly gripped, a warning is dis-
played on the multi-information display
and the warning buzzer sounds.

1884-5. Using the driving support systems
Press the LKA switch to turn the LKA
system on.
The LKA indicator illuminates and a mes-
sage is displayed on the multi-information
display.
Press the LKA switch again to turn the
LKA system off.
When the LKA system is turned on or off,
operation of the LKA system continues in
the same condition the next time the
engine is started.
WARNING
■Before using LKA system
Do not rely solely upon the LKA system.
The LKA system does not automatically
drive the vehicle or reduce the amount of
attention that must be paid to the area in
front of the vehicle. The driver must
always assume full responsibility for driv-
ing safely by paying careful attention to
the surrounding conditions and operat-
ing the steering wheel to correct the path
of the vehicle. Also, the driver must take
adequate breaks when fatigued, such as
from driving for a long period of time.
Failure to perform appropriate driving
operations and pay careful attention may
lead to an accident, resulting in death or
serious injury.
■To avoid operating LKA system by
mistake
When not using the LKA system, use the
LKA switch to turn the system off.
■Situations unsuitable for LKA system
Do not use the LKA system in the follow-
ing situations.
The system may not operate properly
and lead to an accident, resulting in
death or serious injury.
●A spare tire, tire chains, etc. are
equipped.
●When the tires have been excessively
worn, or when the tire inflation pres-
sure is low.
●Tires which differ by structure, manu-
facturer, brand or tread pattern are
used.
●Objects or patterns that could be mis-
taken for white (yellow) lines are pres-
ent on the side of the road (guardrails,
curbs, reflective poles, etc.).
●Vehicle is driven on a snow-covered
road.
●White (yellow) lines are difficult to see
due to rain, snow, fog, dust, etc.
●Asphalt repair marks, white (yellow)
line marks, etc. are present due to road
repair.
●Vehicle is driven in a temporary lane
or restricted lane due to construction
work.
●Vehicle is driven on a road surface
which is slippery due to rainy weather,
fallen snow, freezing, etc.
●Vehicle is driven in traffic lanes other
than on highways and freeways.
●Vehicle is driven in a construction
zone.
■Preventing LKA system malfunctions
and operations performed by mistake
●Do not modify the headlights or place
stickers, etc. on the surface of the
lights.
●Do not modify the suspension etc. If
the suspension etc. needs to be
replaced, contact your Lexus dealer.
●Do not install or place anything on the
hood or grille. Also, do not install a
grille guard (bull bars, kangaroo bar,
etc.).
●If your windshield needs repairs, con-
tact your Lexus dealer.
Turning LKA system on

1894-5. Using the driving support systems
4
Driving
LKA indicator
The illumination condition of the indicator
informs the driver of the system operation
status.
Illuminated in white:
LKA system is operating.
Illuminated in green:
Steering wheel assistance of the steering
assist function or lane centering function is
operating.
Flashing in orange:
Lane departure alert function is operating.
Operation display of steering
wheel operation support
Indicates that steering wheel assistance of
the steering assist function or lane center-
ing function is operating.
Lane departure alert function dis-
play
Displayed when the multi-information dis-
play is switched to th e driving assist system
information screen.
Inside of displayed white lines is
white
Indicates that the system is recognizing
white (yellow) lines . When the vehicle
departs from its lane , the white line dis-
played on the side the vehicle departs from
flashes orange.
Inside of displayed white lines is
black
Indicates that the system is not able to rec-
ognize white (yellow) lines or is temporar-
ily canceled.
Indications on multi-information
display
A
B
C

1904-5. Using the driving support systems
■Operation conditions of each function
●Lane departure alert function
This function operates when all of the fol-
lowing conditions are met.
• LKA is turned on.
• Vehicle speed is approximately 32 mph (50 km/h) or more.
• System recognizes white (yellow) lines.
• Width of traffic lane is approximately 9.8
ft. (3 m) or more.
• Turn signal lever is not operated.
• Vehicle is driven on a straight road or
around a gentle curve with a radius of
more than approximately 492 ft. (150
m).
• No system malfunctions are detected. ( P.192)
●Steering assist function
This function operates when all of the fol-
lowing conditions are me t in addition to the
operation conditions for the lane departure
alert function.
•Setting for “Steering Assist” in of the multi-information display is set to “On”.
( P.79)
• Vehicle is not accelerated or decelerated by a certain amount or more.
• Steering wheel is not operated with a steering force level su itable for changing
lanes.
• ABS, VSC, TRAC and PCS are not operating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not
displayed. ( P.190)
●Vehicle sway warning function
This function operates when all of the fol-
lowing conditions are met.
• Setting for “Sway Warning” in of the multi-information display is set to “On”.
( P.79)
• Vehicle speed is approximately 32 mph (50 km/h) or more.
• Width of traffic lane is approximately 9.8
ft. (3 m) or more.
• No system malfunctions are detected. ( P.192)
●Lane centering function
This function operates when all of the fol-
lowing conditions are met.
• LKA is turned on.
• Setting for “Steering Assist” and “Lane
Center” in of the multi-information
display are set to “On”. ( P.79)
• System recognizes white (yellow) lines.
• Dynamic radar cruise control with full- speed range is operating.
• Width of traffic lane is approximately 8.2 to 13.5 ft. (2.5 to 4.1 m).
• Turn signal lever is not operated.
• Vehicle is driven on a straight road or around a gentle curve with a radius of
more than approximately 656 ft. (200
m).
• No system malfunctions are detected.
( P.192)
• Vehicle does not ac celerate or deceler-
ate by a certain amount or more.
• Steering wheel is not operated with a steering force level su itable for changing
lanes.
• ABS, VSC, TRAC and PCS are not operating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not
displayed. ( P.190)
• Steering assist function is not operating.
■Temporary cancellation of functions
When the operation conditions are no lon-
ger met, a function may be temporarily can-
celed. However, when the operation
conditions are met agai n, operation of the
function is automatically restored.
(  P.190)
■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 oper-
ating or the function may not operate at all.
■Lane departure alert function
The warning buzzer may be difficult to hear
due to external noise, audio playback, etc.
■Hands off steering wheel warning
In the following situations, a warning mes-
sage urging the driver to hold the steering

1914-5. Using the driving support systems
4
Driving
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 continue s to keep their hands
off of the steering wheel, the buzzer sounds,
the driver is warned and the function is tem-
porarily canceled. This warning also oper-
ates in the same way when the driver
continuously operates the steering wheel
only a small amount.
Depending on the vehicle condition and
road conditions, the warning may not oper-
ate. Also, if the system determines that the
vehicle is driving around a curve, warnings
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 st eering wheel assist
of the steering assist function is operat-
ing.
If the driver continue s to keep their hands
off of the steering wheel and the steering
wheel assist is operating, the buzzer sounds
and the driver is warned. Each time the
buzzer sounds, the continuing time of the
buzzer becomes longer.
■Vehicle sway warning function
When the system determines that the vehi-
cle is swaying while the vehicle sway warn- ing function is operating, a buzzer sounds
and a warning message urging the driver to
rest and the symbol sh
own in the illustration
are simultaneously di splayed on the multi-
information display.
Depending on the vehicle and road condi-
tions, the warning may not operate.
■White (yellow) lines are only on one side
of road
The LKA system will not operate for the
side on which white (yellow) lines could not
be recognized.
■Conditions in whic h functions may not
operate properly
In the following situations, the front camera
may not detect white (yellow) lines and vari-
ous functions may not operate normally.
●There are shadows on the road that run
parallel with, or cover, the white (yellow)
lines.
●The vehicle is driven in an area without
white (yellow) lines, su ch as in front of a
tollgate or checkpoint, or at an intersec-
tion, etc.
●The white (yellow) lines are cracked,
“Botts’ dots”, “Raised pavement marker”
or stones are present.
●The white (yellow) lines cannot be seen
or are difficult to see due to sand, etc.
●The vehicle is driven on a road surface
that is wet due to rain, puddles, etc.
●The traffic lines are yellow (which may be
more difficult to reco gnize than lines that
are white).
●The white (yellow) lines cross over a
curb, etc.
●The vehicle is driven on a bright surface,
such as concrete.
●The vehicle is driven on a surface that is

1934-5. Using the driving support systems
4
DrivingIf a different warning message is displayed,
follow the instructions displayed on the
screen.
■Customization
The following settings can be changed.
For how to change settings, refer to P.367.
“Front Camera Unavailable”
The operation con-
ditions of the front
camera (tempera-
ture, etc.) are not
met.
 When the opera-
tion conditions
of the front cam-
era (tempera-
ture, etc.) are
met, the LKA
system will
become avail-
able. Turn the
LKA system off,
wait for a little
while, and then
turn the LKA
system back on.
“Lane Keeping
Assist Unavailable”
The LKA system is
temporarily can-
celed due to a mal-
function in a sensor
other than the front
camera.
 Turn the LKA
system off and
follow the appro-
priate trouble-
shooting
procedures for
the warning
message. After-
ward, drive the
vehicle for a
short time, and
then turn the
LKA system
back on.
Warning messageDetails/Actions
“Lane Keeping
Assist Unavailable Below Approx 32MPH”
The LKA system
cannot be used as
the vehicle speed is
less than approxi-
mately 32 mph (50
km/h).
 Drive the vehicle
at approxi-
mately 32 mph
(50 km/h) or
more.
“Lane Keeping
Assist Unavailable at Current Speed”
The LKA system
cannot be used as
the vehicle speed is
too high.
 Slow down.
FunctionSetting details
Lane departure alert
functionAdjust alert sensitiv- ity
Steering assist func-tionTurn steering wheel
assistance on and off
Vehicle sway warn- ing function
Turn function on and off
Adjust alert sensitiv-ity
Lane centering
functionTurn function on and off
Warning messageDetails/Actions

2024-5. Using the driving support systems
■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.
■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.199) may not be activated.
●Vehicles that cut in suddenly
●Vehicles traveling at low speeds
●Vehicles that are not moving in the same
lane
●Vehicles with small rear ends (trailers
with no load on board, etc.)
●Motorcycles travelin g in the same lane
●When water or snow thrown up by the
surrounding vehicles hinders the detect-
ing of the sensor
●When your vehicle is pointing upwards
(caused by a heavy load in the luggage
compartment, etc.)
●Preceding vehicle has an extremely high
ground clearance
■Conditions under which the vehicle-to-
vehicle distance control mode may not
function correctly
In the case of the following conditions,
operate the brake pedal (or accelerator
pedal, depending on the situation) as nec-
essary.
As the sensor may not be able to correctly
detect vehicles ahead, the system may not
operate properly.
●When the road curves or when the lanes
are narrow
●When steering wheel operation or your
position in the lane is unstable
●When the vehicle ahead of you deceler-
ates suddenly
●When driving on a road surrounded by a
structure, such as in a tunnel or on a
bridge
●While the vehicle speed is decreasing to
the set speed after the vehicle acceler-
ates by depressing the accelerator pedal