Lexus UX 300e (2022 year). Manual in english

257

5-4. Using the driving support systems

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5-4.Using the driving support systems

PCS (Pre-Collision System)



P.262

LTA (Lane Tracing Assist)



P.269

AHS (Adaptive High-beam Sys-
tem)



P.242

AHB (Automatic High Beam)



P.246

RSA (Road Sign Assist)



P.278

Dynamic radar cruise control with
full-speed range



P.282

: If equipped

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 +

The Lexus Safety System + consists
of the following drive assist systems
and contributes to a safe and com-
fortable driving experience:

Driving assist system

WARNING

Lexus Safety System +

The Lexus Safety System + is designed to

operate under the assumption 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 con-

ditions.
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

A
B

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5-4. Using the driving support systems

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.

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 any authorized Lexus

retailer or Lexus authorized repairer,

or any reliable repairer.

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 any

authorized Lexus retailer or Lexus

authorized repairer, or any reliable

repairer for details.

• When the radar sensor or front grille

are removed and installed, or replaced

• When the front bumper is replaced

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 any authorized Lexus

retailer or Lexus authorized repairer,

or any reliable repairer.

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5-4. Using the driving support systems

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WARNING

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 1 cm (0.4 in.) below
the bottom of the front camera

Approximately 20 cm (7.9 in.)
(Approximately 10 cm [4.0 in.] to the
right and left from the center of the
front camera)

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. (



P.347)

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 windshield, the

front camera must be recalibrated.

Contact any authorized Lexus retailer

or Lexus authorized repairer, or any

reliable repairer 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

any authorized Lexus retailer or Lexus

authorized repairer, or any reliable

repairer.

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 any authorized Lexus retailer or

Lexus authorized repairer, or any reli-

able repairer 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.

260

5-4. Using the driving support systems

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 any authorized Lexus retailer or Lexus autho-
rized repairer, or any reliable repairer.

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 any authorized Lexus retailer or Lexus autho-
rized repairer, or any reliable repairer.
• When the temperature around the radar sensor is outside of the operational range, such

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.
(



P.347)

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 Unavailable” is
displayed.

Check whether there is attached materials
on the radar sensor and radar sensor cover,
and if there is, remove it.

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5-4. Using the driving support systems

The system can detect the following:



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.

PCS (Pre-Collision System)

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



P.262) in front of

the vehicle. When the system deter-
mines 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.264)

Detectable objects

System functions

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.

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5-4. Using the driving support systems

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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 follow-

ing conditions carefully. 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.266

• Conditions under which the system

may not operate properly:



P.267

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.

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 EV system on and the tires are

allowed to rotate freely

When inspecting the vehicle using a

drum tester such as a chassis

dynamometer 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

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5-4. Using the driving support systems

Enabling/disabling the pre-colli-
sion system

The pre-collision system can be
enabled/disabled on

(



P.164) of

the multi-information display.

The system is automatically enabled each
time the power 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

(



P.164) 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).

Early

Middle

This is the default setting.

Late

Operational conditions

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

WARNING

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

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5-4. Using the driving support systems

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tal collision with a detected object is high.
Each function is operational at the following speed

Pre-collision warning

Pre-collision brake assist

Pre-collision braking

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)

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.267)

The illustration shows an image of detect-

able objects.

Detectable objects

Vehicle speed

Relative speed between your

vehicle and object

Vehicles

Approx. 10 to 180 km/h (7 to

110 mph)

Approx. 10 to 180 km/h (7 to

110 mph)

Bicyclists and pedestrians

Approx. 10 to 80 km/h (7 to

50 mph)

Approx. 10 to 80 km/h (7 to

50 mph)

Detectable objects

Vehicle speed

Relative speed between your

vehicle and object

Vehicles

Approx. 30 to 180 km/h (20

to 110 mph)

Approx. 30 to 180 km/h (20

to 110 mph)

Bicyclists and pedestrians

Approx. 30 to 80 km/h (20

to 50 mph)

Approx. 30 to 80 km/h (20

to 50 mph)

Detectable objects

Vehicle speed

Relative speed between your

vehicle and object

Vehicles

Approx. 10 to 180 km/h (7 to

110 mph)

Approx. 10 to 180 km/h (7 to

110 mph)

Bicyclists and pedestrians

Approx. 10 to 80 km/h (7 to

50 mph)

Approx. 10 to 80 km/h (7 to

50 mph)

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5-4. Using the driving support systems

Cancelation of the 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.

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

• 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

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5-4. Using the driving support systems

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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, or

other location where strong radio waves

or electrical noise may be present

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 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

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5-4. 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 1 m (3.2 ft.) or taller than approxi-

mately 2 m (6.5 ft.)

• 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 EV system has started the vehi-

cle 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

In some situations such as the following,

sufficient braking force may not be

obtained, preventing the system 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 VSC is disabled

If VSC is disabled (



P.329), the pre-

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.

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5-4. Using the driving support systems

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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 is operating, this
system will operate the steering
wheel to maintain the vehicle’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

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.

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5-4. Using the driving support systems

WARNING

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 any authorized

Lexus retailer or Lexus authorized

repairer, or any reliable repairer.

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 any authorized Lexus retailer or

Lexus authorized repairer, or any reli-

able repairer.

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.274) 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.274) 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.274) 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.274) 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.

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5-4. Using the driving support systems

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WARNING

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,

“Raised pavement marker” or stones

are present.

The white (yellow) lines cannot be

seen or are difficult to see due to sand,

etc.

The vehicle is driven on a road surface

that is wet due to rain, puddles, etc.

The traffic lines are yellow (which may

be more difficult to 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.

Lexus UX 300e (2022 year). Manual in english - page 15