2018 LEXUS LS500 warning

232 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) ■
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 oper-
ating, 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 displayed on the multi-infor-
mation display and the function is tem-
porarily canceled.

2334-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving
Press the LKA switch to turn the LKA
system on.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 unsuitab le 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 th e 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

2354-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving 
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.
■
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.237)●
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 depar-
ture alert function.
•Setting for “Steering Assist” in of the
multi-information display is set to “On”.
( → P.76)
• Vehicle is not accelerated or decelerated
by a fixed 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 oper-
ating. • TRAC or VSC is not turned off.
• Hands off steering wheel alert is not dis-
played. ( → P.236)●
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.76)
• Vehicle speed is ap proximately 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.237)●
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.76)
• 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.237)
• Vehicle does not ac celerate or deceler-
ate by a fixed 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 oper-
ating.
• TRAC or VSC is not turned off.
• Hands off steering wheel alert is not dis-
played. ( → P.236)
• Steering assist function is not operating.
■
Temporary cancellation of functions
When operation condit ions are no longer
met, a function may be temporarily can-
celed. However, when the operation condi-
tions are met again, operation of the

236 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) function is automatically restored.
( → P.235)■
Steering assist function/lane centering
function
Depending on the vehicle speed, lane
departure situation, ro ad 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.
Also, it may be difficult to feel steering
wheel vibrations due to the road conditions,
etc. ■
Hands off steering wheel alert
When the system determines that the driver
has removed the hands from the steering
wheel while the steering assist function or
lane centering function is operating, a warn-
ing message is displaye d on the multi-infor-
mation display. If the driver continues to
keep the hands off of the steering wheel, a
warning message is displayed and the func-
tion is temporarily canceled. This alert also
operates in the same way when the driver
continuously operates the steering wheel
only a small amount. However, depending
on the road conditions , etc., the function
may not cancel. ■
White (yellow) lines ar e 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 camera sen-
sor may not detect white (yellow) lines and
various 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, such 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
bright due to reflected light, etc. ●
The vehicle is driven in an area where the
brightness changes sudd enly, such as at
the entrances and exits of tunnels, etc. ●
Light from the headlights of an oncoming
vehicle, the sun, etc. enters the camera. ●
The vehicle is driven where the road
diverges, merges, etc. ●
The vehicle is driven on a slope. ●
The vehicle is driven on a road which tilts
left or right, or a winding road. ●
The vehicle is driven on an unpaved or
rough road. ●
The vehicle is driven around a sharp
curve. ●
The traffic lane is excessively narrow or
wide. ●
The vehicle is extremely tilted due to car-
rying heavy luggage or having improper
tire pressure. ●
The distance to the preceding vehicle is
extremely short.
●
The vehicle is moving up and down a
large amount due to road conditions
during driving (poor roads or road
seams).
●
The headlight lenses are dirty and emit a
faint amount of light at night, or the beam
axis has deviated.
●
The vehicle is struck by a crosswind.
●
The vehicle has just changed lanes or
crossed an intersection.
●
Snow tires, etc. are equipped.

2374-5. Using the driving support systems
LS500_OM_OM50F54U_(U) 4
Driving ■
Warning message
If the following warning message is dis-
played on the multi-information display and
the LKA indicator illumi nates in orange, fol-
low the appropriate troubleshooting proce-
dure.
If a different warning message is displayed,
follow the instructio ns displayed on the
screen.
■
Customization
The following settings can be changed.Warning message Details/Actions
“Lane Keeping
Assist Malfunc-
tion Visit Your
Dealer” The system may not be
operating properly.
→ Have the vehicle
inspected at your
Lexus dealer.
“Front Camera
Unavailable
Remove Debris
On Windshield” Dirt, rain, condensa-
tion, ice, snow, etc., are
present on the wind-
shield in front of the
camera sensor.
→ Turn the LKA sys-
tem off, remove any
dirt, rain, condensa-
tion, ice, snow, etc.,
from the windshield,
and then turn the LKA
system back on. “Front Camera
Unavailable” The operation condi-
tions of the camera
sensor (temperature,
etc.) are not met.
→ When the opera-
tion conditions of the
camera sensor (tem-
perature, etc.) are met,
the LKA system will
become available. Turn
the LKA system off,
wait for a little while,
and then turn the LKA
system back on.
“Lane Keeping
Assist Unavail-
able” The LKA system is
temporarily canceled
due to a malfunction in
a sensor other than the
camera sensor.
→ Turn the LKA sys-
tem off and follow the
appropriate trouble-
shooting procedures
for the warning mes-
sage. Afterward, drive
the vehicle for a short
time, and then turn the
LKA system back on.
Function Setting details
Lane departure
alert function Adjust alert sensitivity
Adjust alert type
Steering assist
function Turn steering wheel
assistance on and offWarning message Details/Actions

238 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) For how to change settings, refer to
→ P.468 *
: If equipped
Vehicle sway
warning function Turn function on and
off
Adjust alert sensitivity
Lane centering
function Turn function on and
offFunction Setting details
RSA (Road Sign Assist) *
The RSA system recognizes spe-
cific road signs using the camera
sensor and navigation system
(when data is available) to provide
information to the driver via the
multi-information display and
head-up display.
If the system judges that the vehicle
is being driven over the speed limit,
performing prohibited actions, etc.
in relation to the recognized road
signs, it alerts the driver using a
warning display and warning
buzzer *
. *
: This setting needs to be customized.
WARNING
■
Before using the RSA
Do not rely solely upon the RSA system.
RSA is a system which supports the
driver by providing information, but it is
not a replacement for a driver’s own
vision and awareness. Drive safely by
always paying careful attention to the
traffic rules.
Inappropriate or neg ligent driving could
lead to an unexpected accident.

240 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) *
: Displayed when speed limit information for th e road is available from the navigation sys-
tem
In the following situations, the RSA sys-
tem will alert the driver.
 When the vehicle speed exceeds
the speed warning threshold of the
speed limit sign displayed, the sign
display will be emphasized and a
buzzer will sound.
 When the RSA system recognizes a
do not enter sign and determines
that your vehicle has entered a
no-entry area, the displayed sign will
flash and a buzzer will sound.
Depending on the situation, traffic
environment (traffic direction, speed,
unit) may be detected incorrectly and a
warning display may not operate prop-
erly. ■
Turning the system on/off
1 Select on of the
multi-information display ( → P.76)
2 Press on the steering wheel.
■
Automatic turn-off of RSA sign display
In the following situations, a displayed
speed limit sign will stop being displayed
automatically:
●
A new sign is not recognized for a certain
distance. (When speed limit information
is not available from the navigation sys-
tem)
In the following situations, do not enter, stop
and yield signs will st op being displayed
automatically:
●
The system determines that your vehicle
has passed the sign.
●
The road changes due to a left or right turn, etc. ■
Conditions in which the function may
not operate or detect correctly
In the following situations, RSA does not
operate normally and may not recognize
signs, display the incorrect sign, etc. How-
ever, this does not indicate a malfunction. ●
The camera sensor is misaligned due to a
strong impact being applied to the sen-
sor, etc. ●
Dirt, snow, stickers, etc. are on the wind-
shield near the camera sensor. ●
In inclement weather such as heavy rain,
fog, snow or sand storms ●
Light from an oncoming vehicle, the sun,
etc. enters the camera sensor. ●
The sign is dirty, faded, tilted or bent. ●
All or part of the sign is hidden by the
leaves of a tree, a pole, etc. ●
The sign is only visible to the camera sen-
sor for a short amount of time. ●
The driving scene (turning, lane change,
etc.) is judged incorrectly. ●
Even if it is a sign not appropriate for the
currently traveled lane, such a sign exists
directly after a freeway branches, or in an
adjacent lane just before merging. ●
Stickers are attached to the rear of the
preceding vehicle. ●
A sign resembling a system compatible
sign is recognized. ●
The front of the vehicle is raised or low-
ered due to the carried load.
●
The surrounding brightness is not suffi-
cient or changes suddenly.
●
When a sign intended for trucks, etc. is
recognized.
●
The navigation system map data is old.
●
The navigation system is not operating.
●
Side road speed signs may be detected
and displayed (if positioned in sight of the
camera sensor) while the vehicle is trav-
eling on the main road.Warning indication

242 4-5. Using the driving support systems
LS500_OM_OM50F54U_(U) ■
Operation switches
Vehicle-to-vehicle distance switch
“+RES” switch
Cruise control main switch
Cancel switch
“-SET” switch WARNING■
Before using dynamic radar cruise
control with full-speed range
Driving safely is the sole responsibility of
the driver. Do not rely solely on the sys-
tem, and drive safely by always paying
careful attention to your surroundings.
The dynamic radar cruise control with
full-speed range provides driving assis-
tance to reduce the driver’s burden.
However, there are limitations to the
assistance provided.
Set the speed appropriately depending
on the speed limit, traffic flow, road con-
ditions, weather conditions, etc. The
driver is responsible for checking the set
speed.
Even when the system is functioning nor-
mally, the condition of the preceding
vehicle as detected by the system may
differ from the condition observed by the
driver. Therefore, the driver must always
remain alert, assess the danger of each
situation and drive safely. Relying solely
on this system or assuming the system
ensures safety while driving can lead to
an accident, resulting in death or serious
injury. A
B
C
D
E ■
Cautions regarding the driving assist
systems
Observe the following precautions, as
there are limitations to the assistance
provided by the system.
Failure to do so may cause an accident
resulting in death or serious injury.●
Assisting the driver to measure follow-
ing distance
The dynamic radar cruise control with
full-speed range is only intended to
help the driver in determining the fol-
lowing distance between the driver’s
own vehicle and a designated vehicle
traveling ahead. It is not a mechanism
that allows careless or inattentive driv-
ing, and it is not a system that can assist
the driver in low-visibility conditions. It
is still necessary for driver to pay close
attention to the vehicle’s surroundings. ●
Assisting the driver to judge proper
following distance
The dynamic radar cruise control with
full-speed range determines whether
the following distance between the
driver’s own vehicle and a designated
vehicle traveling ahead is within a set
range. It is not capable of making any
other type of judgement. Therefore, it
is absolutely necessary for the driver to
remain vigilant and to determine
whether or not there is a possibility of
danger in any given situation.
●
Assisting the driver to operate the
vehicle
The dynamic radar cruise control with
full-speed range does not include
functions which will prevent or avoid
collisions with vehicles ahead of your
vehicle. Therefore, if there is ever any
possibility of danger, the driver must
take immediate and direct control of
the vehicle and act appropriately in
order to ensure the safety of all
involved.