2018 LEXUS LS500H lane assist

218 4-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) into, preventing the ac tive steering assist
from operating properly:
• When the white (yellow) lane lines are
difficult to see, such as when they are
faint, diverging/merging, or a shadow is
cast upon them
• When the lane is more wide or narrow
than normal
• When there is a light and dark pattern on
the road surface , such as due to road
repairs
• If the system determines that a collision
can be avoided by only using the brakes
• When a pedestrian is detected near the
centerline of the vehicle●
In some situations such as the following,
sufficient braking force or steering force
may not be obtained, preventing the sys-
tem from performing properly:
• If the braking functions cannot operate to
their full extent, such as when the brake
parts are extremely cold, extremely hot,
or wet
• If the vehicle is not properly maintained
(brakes or tires are excessively worn,
improper tire inflation pressure, etc.)
• When the vehicle is being driven on a
gravel road or other slippery surface
• If there are deep ruts in the road
• When driving on a slope
• When driving on a horizontally slanted
road●
Some pedestrians and bicyclists, such as
the following, may not be detected by the
sensors, preventing the system from
operating properly:
• Pedestrians and bicyclists shorter than
approximately 3.2 ft. (1 m) or taller than
approximately 6.5 ft. (2 m)
• Bicyclists riding on unusual bicycles
(bicycles for small children, tricycles,
folding bicycles, BMX bicycles, tandem
bicycles, etc.)
• Pedestrians and bicyclists who are wear-
ing white and look extremely bright
• Pedestrians and bicyclists which are not
illuminated by the headli ghts at night, in a
tunnel, etc.
• Pedestrians whose clothing appears to
be nearly the same co lor or brightness as
their surroundings
• Pedestrians and bicy clists near walls,
fences, guardrails, or large objects • Pedestrians and bicyclists which are on a
metal object (manhole cover, steel plate,
etc.) on the road
• Pedestrians and bicyclists which are mov-
ing fast
• Pedestrians and bicyclists which change
speed or direction abruptly
• Pedestrians and bicyclists which suddenly
emerge from behind a vehicle or large
object
• Pedestrians and bicyclists which are
extremely close to the side of the vehicle
(outside rear view mirror, etc.)
• Pedestrians and bicyclists wearing over-
sized clothing, such as a rain coat, long
skirt, etc., making their silhouette obscure
• Pedestrians and bicyclists who are carry-
ing large baggage, ho lding an umbrella,
etc., hiding part of their body
• Pedestrians and bicyclists behind an
object that hides part of their body
• Pedestrians and bicyclists who are bend-
ing forward or squatting
• Pedestrians who are pushing a stroller,
wheelchair, bicycle or other vehicle
• Groups of pedestrians/bicyclists which
are close together ●
Some guardrails, such as the following,
may not be detected by the sensors, pre-
venting the system from operating prop-
erly:
• Guardrails which are less than approxi-
mately 1.9 ft. (60 cm) tall
• Short guardrails
• Irregularly-shaped gu ardrails (wire cable
guardrails, guardrails made of thin poles,
etc.)
• Guardrails which are not illuminated by
the headlights at nigh t, in a tunnel, etc.
• Guardrails which appear to be nearly the
same color or brightness as their sur-
roundings
• Guardrails which appear to be nearly the
same shape as their surroundings (walls,
etc.)
• Guardrails which are over a metal object
(manhole cover, steel plate, etc.)
• Guardrails which are hidden behind thick
grass
• Guardrails which are extremely close to
the side of the vehicle (outside rear view
mirror, etc.)
• Curved guardrails or guardrails at the
entrance of a curve

2234-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 4
Driving This is the default setting.
3 NearThe warning will begin to operate later
than with the default timing. ■
Operational conditions
The pre-collision system is enabled and the
system determines that the possibility of a
frontal collision with a vehicle or pedestrian
is high.
Each function is operat ional at the following
speeds: ●
Pre-collision warning:
• Vehicle speed is be tween approximately
7 and 110 mph (10 and 180 km/h). (For
detecting a pedestrian, vehicle speed is
between approximately 7 and 50 mph
[10 and 80 km/h].)
• The relative speed between your vehicle
and the vehicle or pedestrian ahead is
approximately 7 mph (10 km/h) or more.●
Pre-collision brake assist:
• Vehicle speed is be tween approximately
20 and 110 mph (30 and 180 km/h). (For
detecting a pedestrian, vehicle speed is
between approximately 20 and 50 mph
[30 and 80 km/h].)
• The relative speed between your vehicle
and the vehicle or pedestrian ahead is
approximately 20 mph (30 km/h) or
more.●
Pre-collision braking:
• Vehicle speed is be tween approximately
7 and 110 mph (10 and 180 km/h). (For
detecting a pedestrian, vehicle speed is
between approximately 7 and 50 mph
[10 and 80 km/h].)
• The relative speed between your vehicle
and the vehicle or pedestrian ahead is
approximately 7 mph (10 km/h) or more.
The system may not operate in the following
situations:
●
If a 12-volt battery terminal has been dis-
connected and reconnected and then the
vehicle has not been driven for a certain
amount of time
●
If the shift position is in R
●
If VSC is disabled (only the pre-collision
warning function will be operational) ■
Pedestrian detection function
The pre-collision system detects pedestri-
ans based on the size, profile, and motion of
a detected object. However, a pedestrian
may not be detected depending on the sur-
rounding brightness and the motion, pos-
ture, and angle of the detected object,
preventing the system from operating prop-
erly. ( → P.225)
■
Cancelation of the pre-collision braking
If either of the follo wing occur while the
pre-collision braking function is operating, it
will be canceled: ●
The accelerator pedal is depressed
strongly. ●
The steering wheel is turned sharply or
abruptly. ■
Conditions under which the system may
operate even if there is no possibility of a
collision ●
In some situations su ch as the following,
the system may determine that there is a
possibility of a frontal collision and oper-
ate.
• When passing a vehicle or pedestrian
• When changing lanes while overtaking a
preceding vehicle
• When overtaking a preceding vehicle
that is changing lanes
• When overtaking a preceding vehicle
that is making a left/right turn

230 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 or
course *
, a warning is displayed on the
multi-information display, and either a
warning buzzer will sound or the steer-
ing wheel will vibrate to alert the driver. *
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
When the warning buzzer sounds or
the steering wheel vibrates, check the
area around your vehicle and carefully
operate the steering wheel to move the
vehicle back to the center of the lane.
When the system determines that the
vehicle might depart from its lane and
that the possibility of a collision with an LTA (Lane Tracing 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 LTA system recognizes white or
yellow lane lines using a camera
sensor. Additionally, it detects pre-
ceding and surrounding vehicles
using the camera sensor and front
radar sensor. WARNING■
Before using LTA system
Do not rely solely upon the LTA system.
The LTA 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 LTA system by mis-
take
When not using the LTA system, use the
LTA switch to turn the system off.
Functions included in LTA system

2314-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 4
Driving overtaking vehicle in the adjacent lane
is high, the lane departure alert will
operate even if the turn signals are
operating.
■
Steering assist function
When the system determines that the
vehicle might depart from its lane or
course *
, the system provides assis-
tance as necessary by operating the
steering wheel in small amounts for a
short period of time to keep the vehicle
in its lane. *
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
If the system detects that the steering
wheel has not been operated for a cer-
tain amount of time or the steering
wheel is not being firmly gripped, the
steering assist function may be can-
celed temporarily, a warning message
may be displayed on the multi-informa-
tion display and a warning buzzer may sound. If the steering assist function is
canceled, release the steering wheel
and then grip it again to enable the
function.
When the system determines that the
vehicle might depart from its lane and
that the possibility of a collision with an
overtaking vehicle in the adjacent lane
is high, the steering assist function will
operate even if the turn signals are
operating.
■
Vehicle sway warning function
When the vehicle is swaying within a
lane, the warning buzzer will sound and
a message will be displayed on the
multi-information display to alert the
driver.

232 4-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) ■
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.
In situations where the white (yellow)
lane lines are difficult to see or are not
visible, such as when in a traffic jam,
this function will op erate to help follow
a preceding vehicle by monitoring the
position of the preceding vehicle.
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 warning buzzer
sounds. Make sure to grip the steering wheel firmly.
WARNING■
Situations unsuitable for LTA system
Do not use the LTA system in the follow-
ing situations, as doing so may lead to an
accident, resulting in death or serious
injury. ●
When the follow-up cruising display is
displayed ( → P.234) and the preced-
ing vehicle changes lanes. (Your vehi-
cle may follow the preceding vehicle
and also change lanes.)
●
When the follow-up cruising display is
displayed ( → P.234) and the preced-
ing vehicle is swaying. (Your vehicle
may sway accordingly and depart from
the lane.)

234 4-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) Press the LTA switch to turn the LTA
system on.
The LTA indicator illuminates and a
message is displayed on the
multi-information display.
Press the LTA switch again to turn the
LTA system off.
When the LTA system is turned on or
off, operation of the LTA system contin-
ues in the same condition the next time
the hybrid system is started. LTA indicator The illumination condition of the indicator
informs the driver of the system operation
status.
Illuminated in white:
LTA 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.
Displayed on the outer side of both lane
displays:
Indicates that steering wheel assist of the
lane centering function is operating.
Displayed on the outer side of a lane dis-
play:
Indicates that steering wheel assist of the
steering assist func tion is operating.
Display flashing on the outer side of both
lane displays:
Alerts the driver that their input is neces-
sary to stay in the center of the lane (lane WARNING●
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 LTA system on Indications on multi-information
display
A
B

2354-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) 4
Driving centering function).
Lane departure alert function dis-
playDisplayed when the mu lti-information dis-
play is switched to the 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.
Follow-up cruising displayIndicates that steering assist of the lane
centering function is operating by monitor-
ing the position of a preceding vehicle.
When the follow-up cruising display is dis- played, if the preceding vehicle changes
lanes, your vehicle may change lanes as
well. Always pay carefu l attention to your
surroundings and operate the steering
wheel as necessary to correct the path of
the vehicle and ensure safety. ■
Warning display
When the lane centerin g function is oper-
ating and the system determines that the
vehicle may depart from its lane due to a
sharp curve, etc., a warning display urging
the driver to operate the steering wheel,
will be displayed.
In some situations a warning display may
not be displayed.
Some displays, which are the same as
those displayed on the multi-informa-
tion display, will be displayed. ■
LTA system curve display on the
head-up displayC
D Indications on head-up display

236 4-5. Using the driving support systems
LS500h_OM_OM50F42U_(U) The curve display on the head-up display
changes according to the direction and
curvature of the curve. ■
Operation conditions of each function●
Lane departure alert function
This function operates when all of the fol-
lowing conditions are met.
• LTA is turned on.
• Vehicle speed is approximately 32 mph
(50 km/h) or more.
•System recognizes wh ite (yellow) lane
lines. (When a white [yellow] line is rec-
ognized on only one side, the system will
operate only for the recognized side.)
• Width of traffic lane is approximately 9.8
ft. (3 m) or more.
• Turn signal lever is not operated. (Except
when a vehicle is in the lane on the side
the turn signal was operated)
• Vehicle is not being driven around a
sharp curve.
• No system malfunctions are detected.
( → P.238)●
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.237)
●
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.238)●
Lane centering function
This function operates when all of the fol-
lowing conditions are met.
• LTA is turned on.
• Setting for “Steering Assist” and “Lane
Center” in of the multi-information
display are set to “On”. ( → P.86)
• This function recognizes white (yellow)
lane lines or the position of a preceding
vehicle (except when the preceding vehi-
cle is small, such as a motorcycle).
• The dynamic radar cruise control with
full-speed range is operating in vehi-
cle-to-vehicle distance control mode.
• Width of traffic lane is approximately 10
to 13 ft. (3 to 4 m).
• Turn signal lever is not operated.
• Vehicle is not being driven around a
sharp curve.
• No system malfunctions are detected.
( → P.238)
• 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.237)
• The driver has one or both hands on the
steering wheel.
• The vehicle is being driven in the center
of a lane.
• 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
function is automatically restored.
( → P.236)
If the operating conditions are no longer
met while the lane ce ntering function is