Lexus ES350 (2023 year). Manual in english — page 10
168
4-5. Using the driving support systems
4-5.Using the driving support systems
■
PCS (Pre-Collision System)
■
LTA (Lane Tracing Assist)
■
AHB (Automatic High Beam)
■
RSA (Road Sign Assist) (if
equipped)
■
Dynamic radar cruise control with
full-speed range
Two types of sensors, located behind
the front grille and windshield, detect
information necessary to operate the
drive assist systems.
Radar sensor
Front camera
Lexus Safety System + 2.5
The Lexus Safety System + 2.5 con-
sists of the following drive assist sys-
tems and contributes to a safe and
comfortable driving experience:
Driving assist system
WARNING
■
Lexus Safety System + 2.5
The Lexus Safety System + 2.5 is
designed to operate under the assump-
tion that the driver will drive safely, and is
designed to help reduce the impact to
the occupants and the vehicle in the case
of a collision or assist the driver in normal
driving conditions.
As there is a limit to the degree of recog-
nition accuracy and control performance
that this system can provide, do not
overly rely on this system. The driver is
always responsible for paying attention
to the vehicle’s surroundings and driving
safely.
Sensors
WARNING
■
To avoid malfunction of the radar sen-
sor
Observe the following precautions.
Otherwise, the radar sensor may not
operate properly, possibly leading to an
accident resulting in death or serious
injury.
A
B
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4-5. Using the driving support systems
4
Driving
WARNING
●
Keep the radar sensor and the radar
sensor cover clean at all times.
Radar sensor
Radar sensor cover
If the front of the radar sensor or the front
or back of the radar sensor cover is dirty
or covered with water droplets, snow,
etc., clean it.
Clean the radar sensor and radar sensor
cover with a soft cloth to avoid damaging
them.
●
Do not attach accessories, stickers
(including transparent stickers) or
other items to the radar sensor, radar
sensor cover or surrounding area.
●
Do not subject the radar sensor or its
surrounding area to a strong impact.
If the radar sensor, front grille, or front
bumper has been subjected to a
strong impact, have the vehicle
inspected by your Lexus dealer.
●
Do not disassemble the radar sensor.
●
Do not modify or paint the radar sen-
sor or radar sensor cover.
●
In the following cases, the radar sensor
must be recalibrated. Contact your
Lexus dealer for details.
• When the radar sensor or front grille
are removed and installed, or replaced
• When the front bumper is replaced
A
B
■
To avoid malfunction of the front
camera
Observe the following precautions.
Otherwise, the front camera may not
operate properly, possibly leading to an
accident resulting in death or serious
injury.
●
Keep the windshield clean at all times.
• If the windshield is dirty or covered
with an oily film, water droplets, snow,
etc., clean the windshield.
• If a glass coating agent is applied to the
windshield, it will still be necessary to
use the windshield wipers to remove
water droplets, etc. from the area of
the windshield in front of the front
camera.
• If the inner side of the windshield
where the front camera is installed is
dirty, contact your Lexus dealer.
●
Do not attach objects, such as stickers,
transparent stickers, etc., to the outer
side of the windshield in front of the
front camera (shaded area in the illus-
tration).
From the top of the windshield to
approximately 0.4 in. (1 cm) below
the bottom of the front camera
Approximately 7.9 in. (20 cm)
(Approximately 4.0 in. [10 cm] to the
right and left from the center of the
front camera)
A
B
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4-5. Using the driving support systems
WARNING
●
If the part of the windshield in front of
the front camera is fogged up or cov-
ered with condensation or ice, use the
windshield defogger to remove the
fog, condensation or ice. (
●
If water droplets cannot be properly
removed from the area of the wind-
shield in front of the front camera by
the windshield wipers, replace the
wiper insert or wiper blade.
●
Do not attach window tint to the wind-
shield.
●
Replace the windshield if it is damaged
or cracked. After replacing the wind-
shield, the front camera must be recal-
ibrated. Contact your Lexus dealer for
details.
●
Do not allow liquids to contact the
front camera.
●
Do not allow bright lights to shine into
the front camera.
●
Do not dirty or damage the front cam-
era.
When cleaning the inside of the wind-
shield, do not allow glass cleaner to
contact the lens of the front camera.
Also, do not touch the lens.
If the lens is dirty or damaged, contact
your Lexus dealer.
●
Do not subject the front camera to a
strong impact.
●
Do not change the installation position
or direction of the front camera or
remove it.
●
Do not disassemble the front camera.
●
Do not modify any components of the
vehicle around the front camera
(inside rear view mirror, etc.) or ceil-
ing.
●
Do not attach any accessories to the
hood, front grille or front bumper that
may obstruct the front camera. Con-
tact your Lexus dealer for details.
●
If a surfboard or other long object is to
be mounted on the roof, make sure
that it will not obstruct the front cam-
era.
●
Do not modify the headlights or other
lights.
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4-5. Using the driving support systems
4
Driving
■
If a warning message is displayed on the multi-information display
A system may be temporarily unavailable or there may be a malfunction in the system.
●
In the following situations, perform the actions specified in the table. When the normal
operating conditions are detected, the message will disappear and the system will
become operational.
If the message does not disappear, contact your Lexus dealer.
●
In the following situations, if the situation has changed (or the vehicle has been driven for
some time) and the normal operating conditions are detected, the message will disap-
pear and the system will become operational.
If the message does not disappear, contact your Lexus dealer.
• When the temperature around the radar sensor is outside of the operational range, such
as when the vehicle is in the sun or in an extremely cold environment
• When the front camera cannot detect objects in front of the vehicle, such as when driving
in the dark, snow, or fog, or when bright lights are shining into the front camera
• Depending on the conditions in the vicinity of the vehicle, the radar may judge the sur-
rounding environment can not be properly recognized. In that case, “Pre-Collision Sys-
Situation
Actions
When the area around a camera is covered
with dirt, moisture (fogged up, covered with
condensation, ice, etc.), or other foreign
matter
Using the wiper and A/C function, remove
the dirt and other attached matter.
(
When the temperature around the front
camera is outside of the operational range,
such as when the vehicle is in the sun or in an
extremely cold environment
If the front camera is hot, such as after the
vehicle had been parked in the sun, use the
air conditioning system to decrease the tem-
perature around the front camera.
If a sunshade was used when the vehicle was
parked, depending on its type, the sunlight
reflected from the surface of the sunshade
may cause the temperature of the front cam-
era to become excessively high.
If the front camera is cold, such after the
vehicle is parked in an extremely cold envi-
ronment, use the air conditioning system to
increase the temperature around the front
camera.
The area in front of the front camera is
obstructed, such as when the hood is open
or a sticker is attached to the part of the
windshield in front of the front camera.
Close the hood, remove the sticker, etc. to
clear the obstruction.
When “Pre-Collision System Radar In Self
Calibration Unavailable See Owner’s Man-
ual” is displayed.
Check whether there is attached materials
on the radar sensor and radar sensor cover,
and if there is, remove it.
173
4-5. Using the driving support systems
4
Driving
The system can detect the following
(The detectable objects differs
depending on the function.):
Vehicles
Bicyclists
Pedestrians
■
Pre-collision warning
When the system determines that the
possibility of a frontal collision is high, a
buzzer will sound and a warning mes-
sage will be displayed on the multi-
information display to urge the driver
to take evasive action.
■
Pre-collision brake assist
When the system determines that the
possibility of a frontal collision is high,
the system applies greater braking
force in relation to how strongly the
brake pedal is depressed.
■
Pre-collision braking
If the system determines that the possi-
bility of a frontal collision is extremely
high, the brakes are automatically
applied to help avoid the collision or
reduce the impact of the collision.
■
Emergency steering assist
If the system determines that the possi-
bility of a frontal collision is high and
that there is sufficient space for the
vehicle to be steered into within its
lane, and the driver has begun evasive
maneuver or steering, emergency
steering assist will assist the steering
movements to help enhance the vehi-
cle stability and for lane departure pre-
vention. During operation, the
indicator will illuminate in green.
PCS (Pre-Collision System)
The pre-collision system uses a
radar sensor and front camera to
detect objects (
P.173) in front of
the vehicle. When the system
determines that the possibility of a
frontal collision with an object is
high, a warning operates to urge
the driver to take evasive action
and the potential brake pressure is
increased to help the driver avoid
the collision. If the system deter-
mines that the possibility of a frontal
collision with an object is extremely
high, the brakes are automatically
applied to help avoid the collision or
help reduce the impact of the colli-
sion.
The pre-collision system can be dis-
abled/enabled and the warning tim-
ing can be changed. (
Detectable objects
System functions
174
4-5. Using the driving support systems
■
Intersection right/left turn assis-
tance
If the system determines that there is a
high possibility of a collision in the fol-
lowing situations, it will assist with Pre-
collision warning and, if necessary Pre-
collision braking.
Depending on the configuration of the
intersection, it may not be possible to
support.
When you turn right/left at an inter-
section and cross the path of an
oncoming vehicle
When you turn right/left, pedestrian
is detected in the forward direction
and estimated to enter your vehi-
cle’s path (bicyclists are not
detected.)
■
Suspension control (if equipped)
When the system determines that the
possibility of a frontal collision is high,
the Adaptive Variable Suspension Sys-
tem (
ing force of the shock absorbers to
help maintain an appropriate vehicle
posture.
WARNING
■
Limitations of the pre-collision sys-
tem
●
The driver is solely responsible for safe
driving. Always drive safely, taking
care to observe your surroundings.
Do not use the pre-collision system
instead of normal braking operations
under any circumstances. This system
will not prevent collisions or lessen col-
lision damage or injury in every situa-
tion. Do not overly rely on this system.
Failure to do so may lead to an acci-
dent, resulting in death or serious
injury.
175
4-5. Using the driving support systems
4
Driving
WARNING
●
Although this system is designed to
help avoid a collision or help reduce
the impact of the collision, its effective-
ness may change according to various
conditions, therefore the system may
not always be able to achieve the same
level of performance.
Read the following conditions care-
fully. Do not overly rely on this system
and always drive carefully.
• Conditions under which the system
may operate even if there is no possi-
bility of a collision:
• Conditions under which the system
may not operate properly:
●
Do not attempt to test the operation of
the pre-collision system yourself.
Depending on the objects used for
testing (dummies, cardboard objects
imitating detectable objects, etc.), the
system may not operate properly, pos-
sibly leading to an accident.
■
Pre-collision braking
●
When the pre-collision braking func-
tion is operating, a large amount of
braking force will be applied.
●
If the vehicle is stopped by the opera-
tion of the pre-collision braking func-
tion, the pre-collision braking function
operation will be canceled after
approximately 2 seconds.
Depress the brake pedal as necessary.
●
The pre-collision braking function may
not operate if certain operations are
performed by the driver. If the acceler-
ator pedal is being depressed strongly
or the steering wheel is being turned,
the system may determine that the
driver is taking evasive action and pos-
sibly prevent the pre-collision braking
function from operating.
●
In some situations, while the pre-colli-
sion braking function is operating,
operation of the function may be can-
celed if the accelerator pedal is
depressed strongly or the steering
wheel is turned and the system deter-
mines that the driver is taking evasive
action.
●
If the brake pedal is being depressed,
the system may determine that the
driver is taking evasive action and pos-
sibly delay the operation timing of the
pre-collision braking function.
■
Emergency steering assist
●
As emergency steering assist opera-
tion will be canceled when the system
determines that lane departure pre-
vention function has been completed.
●
Emergency steering assist may not
operate or may be cancel in the fol-
lowing cases as the system may deter-
mine the driver is taking actions.
• If the accelerator pedal is being
depressed strongly, the steering wheel
is being operated sharply, the brake
pedal is being depressed or the turn
signal lever is being operated. In this
case, the system may determine that
the driver is taking evasive action and
the emergency steering assist may not
operate.
• In some situations, while the emer-
gency steering assist is operating,
operation of the function may be can-
celed if the accelerator pedal is
depressed strongly, the steering wheel
is operated sharply or the brake pedal
is being depressed and the system
determines that the driver is taking
evasive action.
• When the emergency steering assist is
operating, if the steering wheel is held
firmly or is operated in the opposite
direction to that which the system is
generating torque, the function may
be canceled.
176
4-5. Using the driving support systems
■
Enabling/disabling the pre-colli-
sion system
The pre-collision system can be
enabled/disabled on
(
the multi-information display.
The system is automatically enabled each
time the engine switch is turned to ON.
If the system is disabled, the PCS warn-
ing light will turn on and a message will
be displayed on the multi-information
display.
■
Changing the pre-collision warn-
ing timing
The pre-collision warning timing can
be changed on
(
multi-information display.
The warning timing setting is retained
when the engine switch is turned OFF.
However, if the pre-collision system is dis-
abled and re-enabled, the operation timing
will return to the default setting (middle).
If the pre-collision warning timing is
WARNING
■
When to disable the pre-collision sys-
tem
In the following situations, disable the
system, as it may not operate properly,
possibly leading to an accident resulting
in death or serious injury:
●
When the vehicle is being towed
●
When your vehicle is towing another
vehicle
●
When transporting the vehicle via
truck, boat, train or similar means of
transportation
●
When the vehicle is raised on a lift with
the engine running and the tires are
allowed to rotate freely
●
When inspecting the vehicle using a
drum tester such as a chassis dyna-
mometer or speedometer tester, or
when using an on vehicle wheel bal-
ancer
●
When a strong impact is applied to the
front bumper or front grille, due to an
accident or other reasons
●
If the vehicle cannot be driven in a sta-
ble manner, such as when the vehicle
has been in an accident or is malfunc-
tioning
●
When the vehicle is driven in a sporty
manner or off-road
●
When the tires are not properly
inflated
●
When the tires are very worn
●
When tires of a size other than speci-
fied are installed
●
When tire chains are installed
●
When a compact spare tire or an
emergency tire puncture repair kit is
used
●
If equipment (snow plow, etc.) that
may obstruct the radar sensor or front
camera is temporarily installed to the
vehicle
Changing settings of the pre-
collision system
177
4-5. Using the driving support systems
4
Driving
changed, emergency steering assist
timing will also be changed accord-
ingly. If late is selected, emergency
steering assist would not operate in
case of an emergency.
1
Early
2
Middle
This is the default setting.
3
Late
■
Operational conditions for each pre-collision function
The pre-collision system is enabled and the system determines that the possibility of a fron-
tal collision with a detected object is high.
The system may not operate in the following situations:
• If a battery terminal has been disconnected and reconnected and then the vehicle has not
been driven for a certain amount of time
• If the shift lever is in R
• When the VSC OFF indicator is illuminated (only the pre-collision warning function will
be operational)
The operation speeds and operation cancellation for each function is listed below.
●
Pre-collision warning
While the pre-collision warning function is operating, if the steering wheel is operated heav-
ily or suddenly, the pre-collision warning may be cancelled.
Detectable objects
Vehicle speed
Relative speed between your
vehicle and object
Preceding and stopped vehi-
cles
Approx. 7 to 110 mph (10 to
180 km/h)
Approx. 7 to 110 mph (10 to
180 km/h)
Oncoming vehicles
Approx. 7 to 110 mph (10 to
180 km/h)
Approx. 13 to 110 mph (20 to
180 km/h)
Bicyclists and pedestrians
Approx. 7 to 50 mph (10 to
80 km/h)
Approx. 7 to 50 mph (10 to
80 km/h)
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4-5. Using the driving support systems
●
Pre-collision brake assist
●
Pre-collision braking
If either of the following 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.
●
Emergency steering assist
When the turn signal lights are flashing, emergency steering assist will not operate in case of
an emergency.
If any of the following occur while the emergency steering assist function is operating, it will
be canceled:
• The accelerator pedal is depressed strongly.
• The steering wheel is turned sharply or abruptly.
• The brake pedal is depressed.
●
Intersection right/left turn assistance (pre-collision warning)
When the turn signal lights are not flashing, support for turning left or right at an intersection
which targets oncoming vehicles does not work.
Detectable objects
Vehicle speed
Relative speed between your
vehicle and object
Preceding and stopped vehi-
cles
Approx. 20 to 110 mph (30
to 180 km/h)
Approx. 20 to 110 mph (30
to 180 km/h)
Bicyclists and pedestrians
Approx. 20 to 50 mph (30
to 80 km/h)
Approx. 20 to 50 mph (30
to 80 km/h)
Detectable objects
Vehicle speed
Relative speed between your
vehicle and object
Preceding and stopped vehi-
cles
Approx. 7 to 110 mph (10 to
180 km/h)
Approx. 7 to 110 mph (10 to
180 km/h)
Oncoming vehicles
Approx. 7 to 110 mph (10 to
180 km/h)
Approx. 13 to 110 mph (20 to
180 km/h)
Bicyclists and pedestrians
Approx. 7 to 50 mph (10 to
80 km/h)
Approx. 7 to 50 mph (10 to
80 km/h)
Detectable objects
Vehicle speed
Relative speed between your
vehicle and object
Preceding and stopped vehi-
cles, bicyclists and pedestri-
ans
Approx. 25 to 50 mph (40
to 80 km/h)
Approx. 25 to 50 mph (40
to 80 km/h)
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4-5. Using the driving support systems
4
Driving
●
Intersection right/left turn assistance (pre-collision braking)
When the turn signal lights are not flashing, support for turning left or right at an intersection
which targets oncoming vehicles does not work.
■
Object detection function
The system detects objects based on their
size, profile, motion, etc. However, an
object may not be detected depending on
the surrounding brightness and the motion,
posture, and angle of the detected object,
preventing the system from operating
properly. (
P.181) The illustration shows
an image of detectable objects.
■
Conditions under which the system may
operate even if there is no possibility of a
collision
●
In some situations such as the following,
the system may determine that there is a
possibility of a frontal collision and oper-
ate.
• When passing a detectable object, etc.
• When changing lanes while overtaking a
detectable object, etc.
• When approaching a detectable object
in an adjacent lane or on the roadside,
such as when changing the course of
travel or driving on a winding road
• When rapidly closing on a detectable
object, etc.
• When approaching objects on the road-
side, such as detectable objects, guard-
rails, utility poles, trees, or walls
• When there is a detectable object or
other object by the roadside at the
entrance of a curve
Detectable objects
Vehicle speed
Oncoming vehicle
speed
Relative speed
between your vehi-
cle and object
Oncoming vehicles
Approx. 7 to 15 mph
(10 to 25 km/h)
Approx. 20 to 35
mph (30 to 55 km/h)
Approx. 25 to 50
mph (40 to 80
km/h)
Pedestrians
Approx. 7 to 15 mph
(10 to 25 km/h)
Approx. 7 to 15 mph
(10 to 25 km/h)
Detectable objects
Vehicle speed
Oncoming vehicle
speed
Relative speed
between your vehi-
cle and object
Oncoming vehicles
Approx. 10 to 15 mph
(15 to 25 km/h)
Approx. 20 to 28
mph (30 to 45 km/h)
Approx. 28 to 43
mph (45 to 70 km/h)
Pedestrians
Approx. 7 to 15 mph
(10 to 25 km/h)
Approx. 7 to 15 mph
(10 to 25 km/h)
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4-5. Using the driving support systems
• When there are patterns or paint in front
of your vehicle that may be mistaken for a
detectable object
• When the front of your vehicle is hit by
water, snow, dust, etc.
• When overtaking a detectable object
that is changing lanes or making a
right/left turn
• When passing a detectable object in an
oncoming lane that is stopped to make a
right/left turn
• When a detectable object approaches
very close and then stops before entering
the path of your vehicle
• If the front of your vehicle is raised or low-
ered, such as when on an uneven or
undulating road surface
• When driving on a road surrounded by a
structure, such as in a tunnel or on an iron
bridge
• When there is a metal object (manhole
cover, steel plate, etc.), steps, or a protru-
sion in front of your vehicle
• When passing under an object (road
sign, billboard, etc.)
• When approaching an electric toll gate
barrier, parking area barrier, or other
barrier that opens and closes
• When using an automatic car wash
• When driving through or under objects
that may contact your vehicle, such as
thick grass, tree branches, or a banner
• When driving through steam or smoke
• When driving near an object that reflects
radio waves, such as a large truck or
guardrail
• When driving near a TV tower, broad-
casting station, electric power plant,
radar equipped vehicles, etc., or other
location where strong radio waves or
electrical noise may be present
• When there are many things which can
reflect the radio waves of the radar in the
vicinity (tunnels, truss bridges, gravel
roads, snow covered road that have
tracks, etc.)
• While making a right/left turn, when an
oncoming vehicle or a crossing pedes-
trian has already exited the path of your
vehicle
• While making a right/left turn, closely in
front of an oncoming vehicle or a cross-
ing pedestrian.
• While making a right/left turn, when an
oncoming vehicle or a crossing pedes-
trian stops before entering the path of
your vehicle
• While making a right/left turn, when an
oncoming vehicle turns right/left in front
of your vehicle
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4-5. Using the driving support systems
4
Driving
• While steering into the direction of
oncoming traffic
■
Situations in which the system may not
operate properly
●
In some situations such as the following,
an object may not be detected by the
radar sensor and front camera, prevent-
ing the system from operating properly:
• When a detectable object is approaching
your vehicle
• When your vehicle or a detectable object
is wobbling
• If a detectable object makes an abrupt
maneuver (such as sudden swerving,
acceleration or deceleration)
• When your vehicle approaches a detect-
able object rapidly
• When a detectable object is not directly
in front of your vehicle
• When a detectable object is near a wall,
fence, guardrail, manhole cover, vehicle,
steel plate on the road, etc.
• When a detectable object is under a
structure
• When part of a detectable object is hid-
den by an object, such as large baggage,
an umbrella, or guardrail
• When there are many things which can
reflect the radio waves of the radar in the
vicinity (tunnels, truss bridges, gravel
roads, snow covered road that have
tracks, etc.)
• When there is an effect on the radio
waves to the radar that is installed on
another vehicle
• When multiple detectable objects are
close together
• If the sun or other light is shining directly
on a detectable object
• When a detectable object is a shade of
white and looks extremely bright
• When a detectable object appears to be
nearly the same color or brightness as its
surroundings
• If a detectable object cuts or suddenly
emerges in front of your vehicle
• When the front of your vehicle is hit by
water, snow, dust, etc.
• When a very bright light ahead, such as
the sun or the headlights of oncoming
traffic, shines directly into the front cam-
era
• When approaching the side or front of a
vehicle ahead
• If a vehicle ahead is a motorcycle
• If a vehicle ahead is narrow, such as a
personal mobility vehicle
• If a preceding vehicle has a small rear
end, such as an unloaded truck
• If a preceding vehicle has a low rear end,
such as a low bed trailer
• If a vehicle ahead has extremely high
ground clearance
• If a vehicle ahead is carrying a load which
protrudes past its rear bumper
• If a vehicle ahead is irregularly shaped,
such as a tractor or side car
• If a vehicle ahead is a child sized bicycle,
a bicycle that is carrying a large load, a
182
4-5. Using the driving support systems
bicycle ridden by more than one person,
or a uniquely shaped bicycle (bicycle with
a child seat, tandem bicycle, etc.)
• If a pedestrian/or the riding height of a
bicyclist ahead is shorter than approxi-
mately 3.2 ft. (1 m) or taller than approxi-
mately 6.5 ft. (2 m)
• If a pedestrian/bicyclist is wearing over-
sized clothing (a rain coat, long skirt,
etc.), making their silhouette obscure
• If a pedestrian is bending forward or
squatting or bicyclist is bending forward
• If a pedestrian/bicyclist is moving fast
• If a pedestrian is pushing a stroller,
wheelchair, bicycle or other vehicle
• When driving in inclement weather such
as heavy rain, fog, snow or a sandstorm
• When driving through steam or smoke
• When the surrounding area is dim, such
as at dawn or dusk, or while at night or in
a tunnel, making a detectable object
appear to be nearly the same color as its
surroundings
• When driving in a place where the sur-
rounding brightness changes suddenly,
such as at the entrance or exit of a tunnel
• After the engine has started the vehicle
has not been driven for a certain amount
of time
• While making a left/right turn and for a
few seconds after making a left/right turn
• While driving on a curve and for a few
seconds after driving on a curve
• If your vehicle is skidding
• If the front of the vehicle is raised or low-
ered
• If the wheels are misaligned
• If a wiper blade is blocking the front cam-
era
• The vehicle is being driven at extremely
high speeds
• When driving on a hill
• If the radar sensor or front camera is mis-
aligned
• When driving in a traffic lane separated
by more than one lane where oncoming
vehicles are driving while making a
right/left turn
• When largely out of place with the oppo-
site facing targeted oncoming vehicle
during a right/left turn
• While making a right/left turn, when a
pedestrian approaches from behind or
side of your vehicle
●
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
183
4-5. Using the driving support systems
4
Driving
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 (
collision brake assist and pre-collision
braking 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.
LTA (Lane Tracing Assist)
While driving on a road with clear
white (yellow) lane lines, the LTA
system warns the driver if the vehi-
cle may deviate from the current
lane or course
*
, and also can
slightly operate the steering wheel
to help avoid deviation from the
lane or course
*
. Also, while the
dynamic radar cruise control with
full-speed range (
P.195) is oper-
ating, this system will operate the
steering wheel to maintain the vehi-
cle’s lane position.
The LTA system recognizes white
(yellow) lane lines or a course
*
using the front camera. Addition-
ally, it detects preceding vehicles
using the front camera and radar.
*
: Boundary between asphalt and the
side of the road, such as grass, soil, or
a curb
184
4-5. Using the driving support systems
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.
■
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
■
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 vehi-
cle 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 func-
tions.
●
When the follow-up cruising display is
displayed (
P.188) 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.188) and the preced-
ing vehicle is swaying. (Your vehicle
may sway accordingly and depart from
the lane.)
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