Lexus LS500h (2023 year). Manual in english

216

4-5. Using the driving support systems

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.

●

Active steering assist

If either of the following occur while the active steering assist function is operating, it will be

canceled:
• The accelerator pedal is depressed strongly.
• The steering wheel is turned sharply or abruptly.

●

Intersection right/left turn assistance (pre-collision warning)

When the turn signal lights are not flashing, support for turning left or right at an intersec-
tion which targets oncoming vehicles does not work.

●

Intersection right/left turn assistance (pre-collision braking)

When the turn signal lights are not flashing, support for turning left or right at an intersec-
tion which targets oncoming vehicles does not work.

Detectable objects

Vehicle speed

Relative speed between your

vehicle and object

Preceding and stopped vehi-

cles

Approx. 3 to 110 mph (5 to

180 km/h)

Approx. 3 to 110 mph (5 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. 3 to 50 mph (5 to

80 km/h)

Approx. 3 to 50 mph (5 to

80 km/h)

Detectable objects

Vehicle speed

Pedestrians

Approx. 25 to 40 mph (40 to 65 km/h)

Guardrail

Approx. 37 to 50 mph (60 to 80 km/h)

Detectable objects

Vehicle speed

Oncoming vehicle

speed

Relative speed

between your vehicle

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)

217

4-5. Using the driving support systems

Driving

■

Vehicle, pedestrian or bicyclist detec-

tion function

The pre-collision system detects vehicles,

pedestrians and bicyclists based on the size,

profile, and motion of the person. However,

a vehicle, pedestrian or bicyclist may not be

detected depending on the surrounding

brightness and the motion, posture, and

angle of the person, preventing the system

from operating properly. (



P.219)

The illustration shows an image of vehicles,

pedestrians and bicyclists.

■

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 vehicle, pedestrian or

bicyclist

• When changing lanes while overtaking a

vehicle, pedestrian or bicyclist

• When approaching a vehicle, pedestrian

or bicyclist 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 vehicle,

pedestrian, bicyclist, etc.

• When approaching objects on the road-

side, such as vehicle, pedestrian, bicyclist,

guardrails, traffic signs, utility poles, street

lights, trees, walls, etc.

• When there is a vehicle, pedestrian, bicy-

clist or object by the roadside at the

entrance of a curve

• When there are patterns or paint in front

of your vehicle that may be mistaken for a

vehicle, pedestrian or bicyclist

• When the front of your vehicle is hit by

water, snow, dust, etc.

• When overtaking a vehicle, pedestrian or

bicyclist that is changing lanes or making

a right/left turn

Detectable objects

Vehicle speed

Oncoming vehicle

speed

Relative speed

between your vehicle

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)

218

4-5. Using the driving support systems

• When passing a vehicle, pedestrian or

bicyclist in an oncoming lane that is

stopped to make a right/left turn

• When a vehicle, pedestrian or bicyclist

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, dips, or a

protrusion on the road surface or road-

side

• When a crossing pedestrian or bicyclist

approaches very close to the vehicle

• When passing through a place with a low

structure above the road such as a low

ceiling, underpass, bridge girder, traffic

sign, etc.

• 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 the 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

219

4-5. Using the driving support systems

Driving

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

• While steering into the direction of

oncoming traffic

• When passing an oncoming vehicle on a

narrow road

• When driving close to objects such as

walls or poles on a median

• When passing an oncoming vehicle

around a sharp curve

• When passing a vehicle which is making

a left/right turn

• When being passed by a vehicle

approaching from the left or right side in

front of your vehicle

• When making a left/right turn while a

vehicle is approaching from the left or

right side in front of your vehicle

• When passing an object on the side of the

road, such as a parked vehicle

• When passing an oncoming vehicle on a

S curve

• When there is an object that may be mis-

taken for a pedestrian, such as a utility

pole, tree, or pole on the roadside or at

the entrance of a curve

• When there is a bicycle or motorcycle on

the roadside at the entrance of a curve

• If the preceding vehicle is a bicycle or

motorcycle

●

The system may operate the pedestrian

alert unnecessarily if it detects the follow-

ing:

• Pedestrians on a sidewalk

• Bicycles and motorcycles

• Patterns or paint on the road, a wall,

median, billboard, etc. that may be mis-

taken for a pedestrian or bicyclist

■

Situations in which the system may not

operate properly

●

In some situations, such as the following,

a vehicle, pedestrian or bicyclist may not

be detected by the sensors, preventing

the system from operating properly:

• When a vehicle, pedestrian or bicyclist is

approaching your vehicle

• When your vehicle or a vehicle, pedes-

trian or bicyclist is wobbling

• If a vehicle, pedestrian or bicyclist makes

an abrupt maneuver (such as sudden

swerving, acceleration or deceleration)

220

4-5. Using the driving support systems

• When your vehicle approaches a vehicle,

pedestrian or bicyclist rapidly

• When a vehicle, pedestrian or bicyclist is

not directly in front of your vehicle

• When a vehicle, pedestrian or bicyclist is

near a wall, fence, guardrail, manhole

cover, vehicle, steel plate on the road, etc.

• When a vehicle, pedestrian or bicyclist is

under a structure

• When part of a vehicle, pedestrian or

bicyclist is hidden 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 vehicles, pedestrians or

bicyclists are close together

• If the sun or other light is shining directly

on a vehicle, pedestrian, bicyclist or

guardrail ahead

• When a vehicle, pedestrian or bicyclist is

a shade of white and looks extremely

bright

• When a vehicle, pedestrian or bicyclist

appears to be nearly the same color or

brightness as its surroundings

• If a vehicles, pedestrians or bicyclists 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 per-

sonal 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

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, wheel-

chair, 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 vehicle, pedestrian or

bicyclist appear to be nearly the same

221

4-5. Using the driving support systems

Driving

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

• When driving in a location where there

are many objects which reflect radar,

such as a tunnel or parking garage

• After the hybrid system 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

• If the headlights are misaligned

• When approaching a guardrail at a wide

or narrow angle

• When a vehicle approaches your vehicle

from the front left or right side while your

vehicle is entering an intersection with

poor visibility

• When a vehicle approaches your vehicle

from the rear left or right side

• When a vehicle approaches the side of

your vehicle at a shallow angle

• When driving on a road with a grade that

changes sharply (sharp incline/decline)

• Pedestrians and bicyclists which are not

illuminated by the headlights at night, in a

tunnel, etc.

• 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.)

• 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 some situations, such as the following,

the sensors may not detect the lane lines

or a safe space the vehicle can be steered

into, preventing the active 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,

222

4-5. Using the driving support systems

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 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 guardrails (wire cable

guardrails, guardrails made of thin poles,

etc.)

• Guardrails which are not illuminated by

the headlights at night, 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

●

In some situations such as the following,

the system may detect a pedestrian and

display a warning on the head-up display,

even though no pedestrian exists:

• If the front of the vehicle is raised or low-

ered, such as when the road surface is

uneven or undulating (due to ruts, etc.)

• When driving on a slope

• When driving on a horizontally slanted

road

• If the driver’s posture (driver seat posi-

tion) is extreme, such as excessively

reclined

• If the head-up display position is set

extremely high

■

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.

223

4-5. Using the driving support systems

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.

■

Pre-collision seatbacks (front pas-
senger’s seat / power rear seat [if
equipped])

If the system determines that the possi-
bility of a frontal collision is high, it may
move the seatbacks of the front pas-
senger’s seat and power rear seats to
the upright position automatically, if
reclined.

If a seat is being adjusted, it may not be
moved by the pre-collision seat function.

PCS (Pre-Collision System)
(vehicles with Lexus Safety
System + 2.5)

The pre-collision system uses a
radar sensor and front camera to
detect objects (



P.223) 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. (



P.226)

Detectable objects

System functions

224

4-5. Using the driving support systems

■

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.

■

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

When the system determines that the
possibility of a frontal collision is high,
the Adaptive Variable Suspension Sys-
tem (



P.337) will control the damp-

ing force of the shock absorbers to
help maintain an appropriate vehicle
posture.

225

4-5. Using the driving support systems

Driving

WARNING

■

Limitations of the pre-collision system

●

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.

●

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:



P.229

• Conditions under which the system

may not operate properly:



P.231

●

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 canceled 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.

226

4-5. Using the driving support systems

■

Enabling/disabling the pre-colli-
sion system

The pre-collision system can be
enabled/disabled on

(



P.84) of

the multi-information display.

The system is automatically enabled each
time the power switch is turned to ON
mode.

If the system is disabled, the PCS warn-
ing light will turn on and a message will
be displayed on the multi-information
display.

WARNING

• 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.

■

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 hybrid system on 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 cam-

era is temporarily installed to the vehi-

cle

Changing settings of the pre-col-
lision system

227

4-5. Using the driving support systems

Driving

■

Changing the pre-collision warn-
ing timing

The pre-collision warning timing can
be changed on

(



P.84) of the

multi-information display.

The warning timing setting is retained
when the power switch is turned off. How-
ever, if the pre-collision system is disabled
and re-enabled, the operation timing will
return to the default setting (middle).

If the pre-collision warning timing is
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.

Early

Middle

This is the default setting.

Late

■

Operational conditions for each pre-collision function

The pre-collision system is enabled and the system determines that the possibility of a frontal

collision with a detected object is high.
The system may not operate in the following situations:
• If a 12-volt battery terminal has been disconnected and reconnected and then the vehicle

has not been driven for a certain amount of time

• If the shift position 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

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)

228

4-5. Using the driving support systems

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.

●

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.

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

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)

229

4-5. Using the driving support systems

Driving

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.

●

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 sur-

rounding brightness and the motion, pos-

ture, and angle of the detected object,

preventing the system from operating prop-

erly. (



P.231)

The illustration shows an image of detect-

able 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.

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)

230

4-5. Using the driving support systems

• 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 detectable object or other

object by the roadside at the entrance of

a curve

• 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

231

4-5. Using the driving support systems

Driving

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

• 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 per-

sonal 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

232

4-5. Using the driving support systems

• 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

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, wheel-

chair, 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 hybrid system 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

233

4-5. Using the driving support systems

Driving

●

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.338), the

pre-collision brake assist and pre-colli-

sion 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.

234

4-5. Using the driving support systems

: 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 “MULTIMEDIA OWNER’S

MANUAL”.

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.

235

4-5. Using the driving support systems

Driving

■

Enabling/disabling the FCTA sys-
tem

The FCTA system can be enabled/dis-
abled on

(



P.84) of the

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).

Early

Middle

This is the default setting.

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

236

4-5. Using the driving support systems

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

237

4-5. Using the driving support systems

Driving

■

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

238

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.

●

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.

239

4-5. Using the driving support systems

Driving

WARNING

●

When the follow-up cruising display is

displayed (



P.243) 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.243) 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.243) 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.243) 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.

240

4-5. Using the driving support systems

■

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

242

4-5. Using the driving support systems

■

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). (



P.182)

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.

244

4-5. Using the driving support systems

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

245

4-5. Using the driving support systems

Driving

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.

• System recognizes white (yellow) lane

lines or a course

. (When a white [yel-

low] line or course

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.

(



P.248)

• The Advanced Drive is not operating. (if

equipped)

: 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.

: Boundary between asphalt and the side

of the road, such as grass, soil, or a curb

●

Steering assist function

Indications on head-up display

246

4-5. Using the driving support systems

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”.

(



P.84)

• 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. (



P.247)

• 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”.

(



P.84)

• 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.

(



P.248)

• 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”. (



P.84)

• 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.248)

• 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. (



P.247)

• 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.(



P.84)

• 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. (



P.247)

• The dynamic radar cruise control with

247

4-5. Using the driving support systems

Driving

full-speed range approach warning is not

operating.

• The lane departure alert function is not

operating.

• The curve speed reduction function

(



P.269) 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.

(



P.245)

●

If the operation conditions (



P.245) are

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 (



P.245) are

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.269) 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

Lexus LS500h (2023 year). Manual in english - page 7