Lexus LS500h (2022 year). Manual in english — page 14
236
4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
●
In addition to the above, in some situa-
tions, such as the following, the emer-
gency steering assist may not operate.
• 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 wider or narrower than
normal
• When there is a light and dark pattern on
the road surface, such as due to road
repairs
• When the target is too close
• When there is insufficient safe or unob-
structed space for the vehicle to be
steered into
• If oncoming vehicle is present
• If VSC function is operating
●
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
• When the road surface has deep wheel
tracks
• When driving on a hill road
• When driving on a road that has inclines
to the left or right
■
If VSC is disabled
●
If VSC is disabled (
P.337), the pre-col-
lision brake assist and pre-collision brak-
ing functions are also disabled.
●
The PCS warning light will turn on and
“VSC Turned Off Pre-Collision Brake
System Unavailable” will be displayed on
the multi-information display.
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4-5. Using the driving support systems
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4
Driving
*
: If equipped
When the system detects a vehicle
approaching from the left or right in
front of your vehicle when approaching
an intersection, a notification will be
displayed on the head-up display and
panoramic view monitor
*
.
*
: Refer to “NAVIGATION AND MULTI-
MEDIA SYSTEM OWNER’S MAN-
UAL”.
When the system determines that your
vehicle may be about to enter an inter-
section even though a vehicle is
approaching from the left or right in
front of your vehicle, a buzzer will
sound and a message will be displayed
on the multi-information display to
urge you to depress the brake pedal.
Head-up display
Multi-information display
FCTA (Front Cross Traffic
Alert)
*
When approaching an intersection
at low speed, the radar sensors on
the front side of the vehicle can
detect approaching vehicles to the
left and right of the front of the vehi-
cle. In this case, the head-up display
is used to inform the driver of
detected vehicles.
FCTA system functions
WARNING
■
Cautions regarding the use of the
function
The driver is solely responsible for safe
driving. Always drive safely, taking care
to observe your surroundings.
The FCTA system is a supplementary
system that informs the driver of vehicles
approaching from the left and right of the
front of the vehicle.
Do not overly rely on the FCTA system.
Over reliance on the system may lead to
an accident, resulting in death or serious
injury.
The details of the warning display may
differ from the actual traffic conditions.
Although the warning display will stop
being displayed after a certain amount of
time, this does not indicate that vehicles
or pedestrians are no longer around your
vehicle.
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4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
■
Enabling/disabling the FCTA sys-
tem
The FCTA system can be enabled/dis-
abled on
(
multi-information display.
The system is automatically enabled each
time the power switch is turned to ON
mode.
■
Changing the alert timing
The FCTA (Front Cross Traffic Alert)
timing can be changed on
(
P.84) of the multi-information dis-
play.
The set alert timing is retained when the
power switch is turned off. However, if the
FCTA system is disabled and re-enabled,
the alert timing will return to the default
setting (middle).
1
Early
2
Middle
This is the default setting.
3
Late
■
The FCTA function is operational when
The system operates when all of the follow-
ing conditions are met.
●
A shift position other than P or R is
selected.
●
Vehicle speed is approximately 9 mph
(15 km/h) or lower.
●
A vehicle is approaching from the left or
right in front of your vehicle at a speed
between approximately 6 mph (10 km/h)
and 37 mph (60 km/h).
●
There are no preceding vehicles ahead of
your vehicle.
●
The accelerator pedal is not strongly
depressed.
●
The brake pedal is not being strongly
depressed.
■
Situations in which the system may
operate even though no vehicles are
approaching
In certain situations, such as the following,
the system may operate even though no
vehicles are approaching:
●
When approaching objects on the road-
side, such as guardrails, traffic signs, util-
ity poles, street lights, trees, or walls
●
When driving near a TV tower, broad-
casting station, electric power plant, or
other location where strong radio waves
or electrical noise may be present
●
When passing an object on the side of the
road, such as a parked vehicle
●
When a vehicle or pedestrian is
approaching from the left or right in front
of your vehicle from far away
●
When a vehicle or pedestrian is moving
within a parking spot, etc. next to the lane
your vehicle is driving in
●
When a pedestrian or bicyclist is moving
on a sidewalk
●
When a vehicle or pedestrian is moving
away from your vehicle
●
When a vehicle approaching from the left
or right in front of your vehicle is deceler-
ating or stops
●
When a vehicle approaching from the left
Changing settings of the FCTA
system
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4
Driving
or right in front of your vehicle makes a
left/right turn immediately in front of your
vehicle
●
When a pedestrian is approaching your
vehicle
●
When an oncoming vehicle makes a
left/right turn
●
When your vehicle enters an intersection
before a vehicle approaching from the
left or right in front of your vehicle
●
When stopped at traffic light and a vehi-
cle approaches from the left or right in
front of your vehicle
●
When driving in a location where there
are objects which reflect radar, such as
vehicles, guardrails, walls, traffic signs,
etc.
●
When making a left/right turn in front of
an approaching vehicle
●
When passing an oncoming vehicle
●
When being overtaken by another vehi-
cle
●
When driving next to another vehicle or a
pedestrian
●
When a vehicle or pedestrian
approaches the side of your vehicle
Some objects, such as the following, may be
detected and cause the FCTA system to
operate:
●
Pedestrians
■
Situations in which the system may not
operate properly
In some situations, such as the following, a
vehicle may not be detected by a front side
radar sensor, preventing the system from
operating properly:
●
If the front end or side of an approaching
vehicle is small (sports cars, etc.)
●
If the front end of an approaching vehicle
is low (low-slung sports cars, etc.)
●
If the ground clearance of an approach-
ing vehicle is extremely high
●
If the shape of an approaching vehicle is
unusual (tractors, motorcycles with side-
cars, etc.)
●
If a vehicle suddenly enters the detection
area on the left or right in front of your
vehicle from a parking lot, etc.
●
If an approaching vehicle moves sud-
denly (sudden steering, acceleration,
deceleration, etc.)
●
When driving in inclement weather such
as heavy rain, fog, snow or a sandstorm
●
After the hybrid system has been started
and the vehicle has not been driven for a
certain amount of time
●
When driving on a road with a grade that
changes sharply (sharp incline/decline)
●
When driving around a sharp curve or on
an undulating road
●
If a vehicle is approaching from the left or
right of the front of your vehicle diago-
nally
●
When a vehicle is approaching from the
left or right in front of your vehicle from
far away
●
When there is an object between your
vehicle and an approaching vehicle
●
When driving in a location where there
are objects which reflect radar, such as
guardrails, walls, vehicles, etc.
●
When a group of vehicles which are close
together approach
●
Immediately after the FCTA system has
been enabled
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4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
■
If the PCS warning light illuminates and
a message is displayed on the
multi-information display
The system may be temporarily unavailable
or may be malfunctioning.
While driving on a road with clear
white (yellow) lane lines, the LTA sys-
tem warns the driver if the vehicle may
deviate from the current lane or
course
*
, and also can slightly operate
the steering wheel to help avoid devia-
tion from the lane or course
*
. Also,
while the dynamic radar cruise control
with full-speed range is operating, this
system will operate the steering wheel
to maintain the vehicle’s lane position
and when changing lanes.
The LTA system recognizes white (yel-
low) lane lines or a course
*
using the
front camera. Additionally, it detects
preceding and surrounding vehicles
using the front camera and radar.
*
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
LTA (Lane Tracing Assist)
(vehicles with Lexus Safety
System + A)
Summary of functions
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4
Driving
WARNING
■
Before using LTA system
●
Do not rely solely upon the LTA sys-
tem. The LTA system does not auto-
matically 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 driving safely by pay-
ing careful attention to the surround-
ing conditions and operating 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.
●
When not using the LTA system, use
the LTA switch to turn the system off.
■
Situations unsuitable for LTA system
In the following situations, use the LTA
switch to turn the system off. Failure to do
so may lead to an accident, resulting in
death or serious injury.
●
Vehicle is driven on a road surface
which is slippery due to rainy weather,
fallen snow, freezing, etc.
●
Vehicle is driven on a snow-covered
road.
●
White (yellow) lines are difficult to see
due to rain, snow, fog, dust, etc.
●
Vehicle is driven in a temporary lane or
restricted lane due to construction
work.
●
Vehicle is driven in a construction
zone.
●
A spare tire, tire chains, etc. are
equipped.
●
When the tires have been excessively
worn, or when the tire inflation pres-
sure is low.
●
During emergency towing.
■
Situations in which the lane change
assist function should not be used
●
When driving on a one lane road or
road without lane markers
●
When there is no broken white line
between your vehicle and the lane
toward which the turn signal is oper-
ated
●
Vehicle is driven in traffic lanes other
than that freeways and highways.
■
Preventing LTA 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.
■
Conditions in which functions may
not operate properly
In the following situations, the functions
may not operate properly and the vehicle
may depart from its lane. Drive safely by
always paying careful attention to your
surroundings and operate the steering
wheel to correct the path of the vehicle
without relying solely on the functions.
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4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
WARNING
●
When the follow-up cruising display is
displayed (
P.247) 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.247) and the preced-
ing vehicle is swaying. (Your vehicle
may sway accordingly and depart from
the lane.)
●
When the follow-up cruising display is
displayed (
P.247) and the preced-
ing vehicle departs from its lane. (Your
vehicle may follow the preceding vehi-
cle and depart from the lane.)
●
When the follow-up cruising display is
displayed (
P.247) and the preced-
ing vehicle is being driven extremely
close to the left/right lane line. (Your
vehicle may follow the preceding vehi-
cle and depart from the lane.)
●
Vehicle is being driven around a sharp
curve.
●
Objects or patterns that could be mis-
taken for white (yellow) lines are pres-
ent on the side of the road (guardrails,
reflective poles, etc.).
●
Vehicle is driven where the road
diverges, merges, etc.
●
Repair marks of asphalt, white (yellow)
lines, etc. are present due to road
repair.
●
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 inter-
section, 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.
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4
Driving
■
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.
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 vehi-
cle might depart from its lane and that the
possibility of a collision with an overtaking
vehicle in the adjacent lane is high, the lane
departure alert will operate even if the turn
signals are operating.
*
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
WARNING
●
The traffic lines are yellow (which may
be more difficult to recognize than
lines that are white).
●
The white (yellow) lines cross over a
curb, etc.
●
The vehicle is driven on a bright sur-
face, such as concrete.
●
If the edge of the road is not clear or
straight.
●
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 suddenly, such
as at the entrances and exits of tunnels,
etc.
●
Light from the headlights of an oncom-
ing vehicle, the sun, etc. enters the
camera.
●
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 traffic lane is excessively narrow
or wide.
●
The vehicle is extremely tilted due to
carrying 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).
●
When driving in a tunnel or at night
with the headlights off or when a head-
light is dim due to its lens being dirty or
it being misaligned.
●
The vehicle is struck by a crosswind.
●
The vehicle is affected by wind from a
vehicle driven in a nearby lane.
●
The vehicle has just changed lanes or
crossed an intersection.
●
Tires which differ by structure, manu-
facturer, brand or tread pattern are
used.
●
When tires of a size other than speci-
fied are installed.
●
Snow tires, etc. are equipped.
●
The vehicle is being driven at
extremely high speeds.
Functions included in LTA system
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4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
■
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.
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-information display and the
function is temporarily canceled.
When the system determines that the vehi-
cle 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.
*
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
■
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.
245
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4
Driving
■
Lane centering function
This function is linked with dynamic
radar cruise control with full-speed
range and provides the required assis-
tance by operating the steering wheel
to keep the vehicle in its current lane.
When dynamic radar cruise control with
full-speed range is not operating, 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 operate 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-information display and the
function is temporarily canceled.
■
Lane change assist function
This function is linked to the dynamic
radar cruise control with full-speed
range and provides assistance for per-
forming lane changes by operating the
steering wheel when you hold the turn
signal lever partway (lane change posi-
tion). (
When lane change assist function is
operating, the acceleration and decel-
eration of the vehicle is controlled
while the preceding vehicle and vehi-
cles driven in the lane toward which the
turn signal is operated are monitored.
Use lane change assist function on
freeways and highways.
When the lane centering function is not
operating, the lane change assist function
will not operate.
The lane change assist function should not
be operated when changing lanes on a
road that is diverging or merging.
246
4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
Press the LTA switch to turn the LTA
system on.
The LTA indicator illuminates and a mes-
sage 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 continues in
the same condition the next time the hybrid
system is started.
Hold the turn signal lever partway
(lane change position) for approxi-
mately 1 second.(
The direction you are signaling will be dis-
played on the multi-information display.
LTA indicator
The illumination condition of the indicator
informs the driver of the system operation
status.
Illuminated in white: LTA system is operat-
ing.
Illuminated in green: Steering wheel assis-
tance of the steering assist function or lane
centering function is operating.
Flashing in orange: Lane departure alert
Turning LTA system on
Operating the lane change assist
function
Indications on multi-information
display
A
247
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4
Driving
function is operating.
Operation display of steering
wheel operation support
Displayed when the multi-information dis-
play is switched to the driving support sys-
tem information display.
Indicates that steering wheel assistance of
the steering assist function or lane center-
ing function is operating.
Both outer sides of the lane are displayed:
Indicates that steering wheel assist of the
lane centering function is operating.
One outer side of the lane is displayed:
Indicates that steering wheel assist of the
steering assist function is operating.
Both outer sides of the lane are flashing:
Alerts the driver that their input is neces-
sary to stay in the center of the lane (lane
centering function).
Lane departure alert function dis-
play
Displayed when the multi-information dis-
play is switched to the driving support sys-
tem information display.
Inside of displayed lines is white
Indicates that the system is recognizing
white (yellow) lines or a course
*
. When
the vehicle departs from its lane, the
white line displayed on the side the
vehicle departs from flashes orange.
Inside of displayed lines is black
Indicates that the system is not able to
recognize white (yellow) lines or a
course
*
or is temporarily canceled.
*
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
Follow-up cruising display
Displayed when the multi-information dis-
play is switched to the driving support sys-
tem information display.
Indicates 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 moves,
your vehicle may move in the same way.
Always pay careful attention to your sur-
roundings and operate the steering wheel
as necessary to correct the path of the
vehicle and ensure safety.
■
Lane change assist function
Lane change assist display
B
C
D
248
4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
Indicates that steering wheel assist of the
lane change assist function is operating.
Approaching vehicle warning dis-
play
Indicates that an approaching vehicle is
detected in the adjacent lane.
■
Warning display
When the lane centering 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.
This display will also be displayed when
operation of the lane change assist func-
tion is canceled.
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 display
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.
*1
• System recognizes white (yellow) lane
lines or a course
*2
. (When a white [yel-
low] line or course
*2
is recognized 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 another vehicle is in the lane on the
side where the turn signal was operated)
• Vehicle is not being driven around a
sharp curve.
• No system malfunctions are detected.
(
• The Advanced Drive is not operating. (if
equipped)
*1
: The function operates even if the vehi-
cle speed is less than approximately 32
mph (50 km/h) when the lane center-
ing function is operating.
*2
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
●
Steering assist function
Indications on head-up display
249
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4
Driving
This function operates when all of the fol-
lowing conditions are met 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”.
(
• Vehicle is not accelerated or decelerated
by a fixed amount or more.
• Steering wheel is not operated with a
steering force level suitable for changing
lanes.
• ABS, VSC, TRAC and PCS are not oper-
ating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not
displayed. (
• The Advanced Drive is not operating. (if
equipped)
●
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”.
(
• 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.
(
• The Advanced Drive is not operating. (if
equipped)
●
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”. (
• 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.
(
• Vehicle does not accelerate or deceler-
ate by a fixed amount or more.
• Steering wheel is not operated with a
steering force level suitable for changing
lanes.
• ABS, VSC, TRAC and PCS are not oper-
ating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not
displayed. (
• 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.
• The Advanced Drive is not operating. (if
equipped)
●
Lane change assist function
This function will operate when all of the
following conditions are met:
• The lane centering function is operating.
• “Lane Change Assist” is set to “ON” in
of the multi-information dis-
play.(
• The vehicle speed is between approxi-
mately 57 and 85 mph (90 and 140
km/h).
• White (yellow) lane lines are detected by
the system.
• A broken white line is detected between
your vehicle and the lane toward which
the turn signal is operated.
• The turn signal lever is held partway (lane
change position) for approximately 1 sec-
ond.
• A vehicle is not overtaking your vehicle
or detected in the lane toward which the
turn signal is operated.
• The vehicle is being driven straight or
around a slight curve.
• The vehicle is not accelerating or decel-
erating more than a certain amount.
• The steering wheel is not being turned
sufficiently to perform a lane change.
• ABS, VSC, TRAC and PCS are not oper-
ating.
• TRAC or VSC is not turned off.
• Hands off steering wheel warning is not
displayed. (
• The dynamic radar cruise control with
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4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
full-speed range approach warning is not
operating.
• The lane departure alert function is not
operating.
• The curve speed reduction function
(
P.273) is not operating.
• The Advanced Drive is not operating. (if
equipped)
■
Temporary cancelation of functions
●
When operation conditions are no longer
met, a function may be temporarily can-
celed. However, when the operation con-
ditions are met again, operation of the
function is automatically restored.
(
●
If the operation conditions (
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.
●
If the operating conditions (
no longer met, the buzzer may sound to
indicate that the lane change assist func-
tion has been temporarily canceled.
■
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.
●
Even if the curve speed reduction func-
tion (
P.273) operates, the lane center-
ing function may not be able to drive the
vehicle around a curve successfully.
●
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
*
is not clear or
straight, the lane departure alert function
may not operate.
●
It may not be possible for the system to
determine if there is a danger of a colli-
sion with a vehicle in an adjacent lane.
●
Do not attempt to test the operation of
the lane departure alert function.
*
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curb
■
Lane change assist function
Depending on the vehicle speed, vehicle
condition, road conditions, or conditions of
the area around the vehicle, the lane
change assist function may not operate or it
may be difficult to recognize that it has
operated.
If steering control operation is excessive or
insufficient, it can be corrected by the
driver’s operation of the steering wheel.
In situations such as the following, the lane
change assist function may be canceled:
●
When the system no longer detects white
(yellow) lane lines
●
When the turn signal lever is operated
fully (right/left turn position)
●
When the vehicle speed is outside of the
operational range of the function
●
When the system detects operation of
the steering wheel, brake or accelerator
pedal by the driver
While the lane change assist function is
operating, if the system detects that a vehi-
cle is quickly approaching in the lane
toward which the turn signal is operated,
the steering assist may slightly steer the
vehicle away from the lane while a buzzer is
sounding, the steering wheel is vibrating,
and a warning display is displayed on the
multi-information display, to help prevent
the vehicle from entering the lane and alert
the driver of the approaching vehicle.
■
Hands off steering wheel warning
In the following situations, a warning mes-
sage urging the driver to hold the steering
251
4-5. Using the driving support systems
LEXUS LS500h Owner's Manual
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.
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 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
driver is driving without holding the steer-
ing wheel while the steering wheel assist
of the steering assist function is operating
If the driver continues 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.
The buzzer also sounds even if the alert
type is set to
.
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 arms are held in front
of the steering wheel.
■
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 shown in the illustration
are simultaneously displayed on the
multi-information display.
Depending on the vehicle and road condi-
tions, the warning may not operate.
■
Situations in which LTA will turn on auto-
matically (vehicles with Advanced
Drive)
When the dynamic radar cruise control
with full-speed range operates in vehi-
cle-to-vehicle distance control mode, LTA
will turn on. (
■
LTA (Lane Tracing Assist) warning mes-
sages
If the following warning message is dis-
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