2018 LEXUS LS500H lane assist

2374-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 4
Driving operating, a buzzer may sound to indicate
that the function has been temporarily can-
celed . If the alert type customization setting
is set to vibrate the steering wheel, the
buzzer will not sound. (The steering wheel
will vibrate.)
If a message urging operation of the steer-
ing wheel is displayed, operate the steering
wheel. ■
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.
The steering control of the function is over-
rided by the driver’s steering wheel opera-
tion.
When the vehicle speed is approximately
31 mph (50 km/h) or less, the warning dis-
play of the lane centering function will not
operate.
Do not attempt to activate the steering
assist function. ■
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.
If the edge of the road is not clear or
straight, the lane departure alert function or
steering assist function may not operate.
In situations such as the following, it may not
be possible for the system to determine if
there is danger of a collision with an over-
taking vehicle in an adjacent lane:
●
When the relative speed between your
vehicle and surrounding vehicles is large
●
When driving around a curve
Do not attempt to activate the lane depar-
ture alert function.
■
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 th e driver continues to
keep the hands off of the steering wheel for
6 seconds, a buzzer sounds, a warning
message is displayed and the function is
temporarily canceled. This alert also oper-
ates in the same way when the driver con-
tinuously operates the steering wheel only a
small amount. If the stee ring assist function
is canceled, release the steering wheel and
then grip it again to enable the function.
In situations such as the following, the sys-
tem may not be able to detect when the
driver’s hands are on the steering wheel: ●
If a steering wheel cover is installed. ●
If the driver is wearing gloves. ●
If something is attached to the steering
wheel. ●
If the driver is gripping the wood trim,
stitched area, spokes, or other part of the
steering wheel that does not have sen-
sors.
In situations such as the following, the hands
off steering wheel alert may not operate
and the steering assist function and lane
centering function may operate even if the
driver’s hands are off the steering wheel: ●
If an object contacts the steering wheel. ●
If a wide object or ar ms are held in front
of the steering wheel. ■
Conditions in whic h functions may not
operate properly
In the following situations, the functions may
not operate properly: ●
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.

2394-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 4
Driving
If 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.481“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 LTA system will
become available. Turn
the LTA system off, wait
for a little while, and
then turn the LTA sys-
tem back on.
“LTA Unavailable” The LTA system is tem-
porarily canceled due
to a malfunction in a
sensor other than the
camera sensor.
→ Turn the LTA system
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
LTA system back on.
“LTA Unavailable
at Current
Speed” The LTA system cannot
be used as the vehicle
speed is too high.
→ Slow down.Warning message Details/Actions Function Setting details
Lane departure
alert function Adjust alert sensitivity
Adjust alert type
Steering assist
function Turn steering wheel
assistance on and off
Vehicle sway
warning function Turn function on and
off
Adjust alert sensitivity
Lane centering
function Turn function on and
off

240 4-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) *
:If equipped
■
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 or the steering wheel
vibrates to alert the driver. When the warning buzzer sounds or
the steering wheel vibrates, 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 displayed on the multi-infor-
mation display and the function is tem-
porarily canceled.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 cam-
era sensor on the upper portion of
the windshield.
Functions included in LKA sys-
tem

2414-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 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 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.

2434-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 4
Driving The LKA indicator illuminates and a
message 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 con-
tinues in the same condition the next
time the hybrid system is started.
LKA indicatorThe 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 assistan ce 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.Indications on multi-information
display
A B
C

244 4-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 
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.246)●
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.86)
• 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.245)●
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.86)
• 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.246)●
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.86)
• 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.246)
• 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.245)
• 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

2454-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 4
Driving function is automatically restored.
( → P.244)■
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.

246 4-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) ■
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