Lexus UX 300e (2023 year). Manual in english

253

5-3. Operating the lights and wipers

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When the windshield wipers are not
being used, they retract to below the
hood. To enable the windshield wipers
to be lifted when parking in cold condi-

tions or when replacing a windshield
wiper insert, change the rest position of
the windshield wipers to the service
position using the wiper lever.

Raising the wipers to the service
position

Within approximately 45 seconds of
turning the power switch off, move the
wiper lever to the

position and

hold it for approximately 2 seconds or
more.

The wipers will move to the service posi-
tion.

Lifting the windshield wipers

While holding the hook portion

the wiper arm, lift the windshield wiper
from the windshield.

WARNING

Caution regarding the use of wind-

shield wipers in AUTO mode (vehi-

cles with rain-sensing windshield

wipers)

The windshield wipers may operate

unexpectedly if the sensor is touched or

the windshield is subject to vibration in

AUTO mode. Take care that your fin-

gers, etc. do not become caught in the

windshield wipers.

Caution regarding the use of washer

fluid

When it is cold, do not use the washer

fluid until the windshield becomes warm.

The fluid may freeze on the windshield

and cause low visibility. This may lead to

an accident, resulting in death or serious

injury.

NOTICE

When the washer fluid tank is empty

Do not operate the switch continually as

the washer fluid pump may overheat.

When a nozzle becomes blocked

In this case, contact any authorized

Lexus retailer or Lexus authorized

repairer, or any reliable repairer.

Do not try to clear it with a pin or other

object. The nozzle will be damaged.

To prevent 12-volt battery discharge

Do not leave the wipers on longer than

necessary when the EV system is off.

Changing the windshield wiper
rest position/Lifting the wind-
shield wipers

254

5-3. Operating the lights and wipers

Lowering the windshield wipers to the

retracted position

With the windshield wipers placed on the

windshield, turn the power switch to ON

and then move the wiper lever to an operat-

ing position. When the wiper switch is

turned off, the windshield wipers will stop at

the retracted position. Even if the wipers

deviate while the power switch is OFF, the

wipers will return to the normal position.

NOTICE

When lifting the windshield wipers

Do not lift the windshield wipers when

they are in the retracted position

below the hood. Otherwise, they may

contact the hood, possibly resulting in

damage to a windshield wiper and/or

the hood.

Do not lift a windshield wiper by the

wiper blade. Otherwise, the wiper

blade may be deformed.

Do not operate the wiper lever when

the windshield wipers are lifted. Oth-

erwise, the windshield wipers may

contact the hood, possibly resulting in

damage to the windshield wipers

and/or hood.

255

5-3. Operating the lights and wipers

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Operating the

switch operates

the rear wiper as follows:

Off

Intermittent operation

Normal operation

Washer/wiper dual opera-

tion

Pushing the lever operates the wiper and
washer.
The wiper will automatically operate a cou-
ple of times after the washer squirts.

The rear window wiper and washer can

be operated when

The power switch is in ON.

If no windshield washer fluid sprays

Check that the washer nozzles are not

blocked, if there is washer fluid in the

washer fluid tank.

Reverse-linked rear window wiper

function

When the shift position is shifted to R when

the front wipers are operating, the rear win-

dow wiper will operate once.

Back door opening linked rear window

wiper stop function

When the rear window wiper is operating, if

the back door is opened while the vehicle is

stopped, operation of the rear window

wiper will be stopped to prevent anyone

near the vehicle from being sprayed by

water from the wiper. When the back door
is closed, wiper operation will resume.

: The setting must be customized at any

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

Customization

Setting of the reverse-linked function can

Rear window wiper and
washer

The rear window wiper and washer
can be used by operating the lever.

NOTICE

When the rear window is dry

Do not use the wiper, as it may damage

the rear window.

Operating the wiper lever

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

258

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.

259

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.

262

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.

263

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

264

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

265

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)

266

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

267

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

268

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.

269

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.

270

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.

271

5-4. Using the driving support systems

ivin
g

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.

272

5-4. 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.
Vehicle with BSM: When the system
determines that the vehicle might
depart from its lane and that the possi-
bility 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

Steering assist function

When the system determines that the
vehicle might depart from its lane or
course

, the system provides assis-

tance as necessary by operating the
steering wheel in small amounts for a
short period of time to keep the vehicle
in its lane.
If the system detects that the steering
wheel has not been operated for a

WARNING

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 sys-
tem

273

5-4. Using the driving support systems

ivin
g

fixed amount of time or the steering
wheel is not being firmly gripped, a
warning is displayed on the multi-infor-
mation display and the function is tem-
porarily canceled.
Vehicle with BSM: When the system
determines that the vehicle might
depart from its lane and that the possi-
bility of a collision with an overtaking
vehicle in the adjacent lane is high, the
steering assist function will operate
even if the turn signals are operating.

: Boundary between asphalt and the side

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

Vehicle sway warning function

When the vehicle is swaying within a
lane, the warning buzzer will sound
and a message will be displayed on the
multi-information display to alert the
driver.

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-infor-

275

5-4. Using the driving support systems

ivin
g

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).

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 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 rec-
ognize white (yellow) lines or a course

is temporarily canceled.

: Boundary between asphalt and the side

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

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 50 km/h

(32 mph) or more.

• System recognizes white (yellow) lane

lines or a course

. (When a white [yel-

276

5-4. Using the driving support systems

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 3 m

(9.8 ft.) or more.

• Turn signal lever is not operated. (Vehi-

cles with BSM: 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.278)

: The function operates even if the vehicle

speed is less than approximately 50
km/h (32 mph) when the lane centering
function is operating.

: Boundary between asphalt and the side

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

Steering assist function

This function operates when all of the fol-
lowing conditions are met in addition to the
operation conditions for the lane departure
alert function.
• Setting for “Steering Assist” in

of the

multi-information display is set to “On”.

(



P.164)

• 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, TRC and PCS are not oper-

ating.

• TRC or VSC is not turned off.

• Hands off steering wheel warning is not

displayed. (



P.277)

Vehicle sway warning function

This function operates when all of the fol-
lowing conditions are met.
• Setting for “Warning” in

of the multi-

information display is set to “On”.

(



P.164)

• Vehicle speed is approximately 50 km/h

(32 mph) or more.

• Width of traffic lane is approximately 3 m

(9.8 ft.) or more.

• No system malfunctions are detected.

(



P.278)

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

Centre” in

of the multi-information

display are set to “On”. (



P.164)

• 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 vehicle-

to-vehicle distance control mode.

• Width of traffic lane is approximately 3 to

4 m (10 to 13 ft.).

• Turn signal lever is not operated.

• Vehicle is not being driven around a

sharp curve.

• No system malfunctions are detected.

(



P.278)

• 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, TRC and PCS are not oper-

ating.

• TRC or VSC is not turned off.

• Hands off steering wheel warning is not

displayed. (



P.277)

• The vehicle is being driven in the center

of a lane.

• Steering assist function is not operating.

Temporary cancelation of functions

When operation conditions are no lon-

ger met, a function may be temporarily

canceled. However, when the operation

conditions are met again, operation of

the function is automatically restored.

(



P.275)

If the operation conditions (



P.275) 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-

277

5-4. Using the driving support systems

ivin
g

porarily canceled. However, if the Steer-

ing wheel vibration customization setting

is set to On, the system will notify the

driver by vibrating the steering wheel

instead of sounding the buzzer.

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.

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.

Vehicles with BSM: It may not be possi-

ble for the system to determine if there is

a danger of a collision 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

Hands off steering wheel warning

In the following situations, a warning mes-

sage urging the driver to hold the steering

wheel and the symbol shown in the illustra-

tion are displayed on the multi-information

display to warn the driver. The warning

stops when the system determines that the

driver holds the steering wheel. Always

keep your hands on the steering wheel

when using this system, regardless of warn-

ings.

When the system determines that the

driver is driving without holding the steer-

ing wheel while the system is operating

If the driver continues to keep their hands
off of the steering wheel, the buzzer sounds,
the driver is warned and the function is tem-
porarily canceled. This warning also oper-
ates in the same way when the driver
continuously operates the steering wheel
only a small amount. The buzzer also
sounds even if the alert type is set to Steer-
ing wheel vibration.

When the system determines that the

vehicle may deviate from the lane while

driving around a curve while the lane

centering function is operating.

Depending on the vehicle condition and
road conditions, the warning may not oper-
ate. Also, if the system determines that the
vehicle is driving around a curve, warnings
will occur earlier than during straight-lane
driving.

When the system determines that the

driver is driving without holding the steer-

ing wheel while the steering wheel assist

of the steering assist function is operat-

ing.

If the driver continues to keep their hands
off of the steering wheel and the steering
wheel assist is operating, the buzzer sounds
and the driver is warned. Each time the
buzzer sounds, the continuing time of the
buzzer becomes longer.
The buzzer also sounds even if the alert
type is set to Steering wheel vibration.

278

5-4. Using the driving support systems

Vehicle sway warning function

When the system determines that the vehi-

cle is swaying while the vehicle sway warn-

ing function is operating, a buzzer sounds

and a warning message urging the driver to

rest and the symbol shown in the illustration

are simultaneously displayed on the multi-

information display.

Depending on the vehicle and road condi-

tions, the warning may not operate.

Warning message

If the following warning message is dis-

played on the multi-information display and

the LTA indicator illuminates in orange, fol-

low the appropriate troubleshooting proce-

dure. Also, if a different warning message is

displayed, follow the instructions displayed

on the screen.

“LTA Malfunction Visit Your Dealer”

The system may not be operating properly.
Have the vehicle inspected by any autho-
rized Lexus retailer or Lexus authorized
repairer, or any reliable repairer.

“LTA Unavailable”

The system is temporarily canceled due to a
malfunction in a sensor other than the front
camera. Turn the LTA system off, wait for a
little while, and then turn the LTA system
back on.

“LTA Unavailable at Current Speed”

The function cannot be used as the vehicle
speed exceeds the LTA operation range.
Drive slower.

Customization

Function settings can be changed.
(Customizable features:



P.483)

When the front camera recognizes a
sign and/or information of a sign is

RSA (Road Sign Assist)

The RSA system recognizes spe-
cific road signs using the front cam-
era and/or navigation system
(when speed limit information is
available) to provide information to
the driver via the display.

If the system judges that the vehicle
is being driven over the speed limit,
performing prohibited actions, etc.
according to the recognized road
signs, it notifies the driver through a
visual notification and notification
buzzer or steering wheel vibration.

WARNING

Before using the RSA

Do not rely solely upon the RSA system.

RSA is a system which supports the

driver by providing information, but it is

not a replacement for a driver’s own

vision and awareness. Drive safely by

always paying careful attention to the

traffic rules.

Indication on the multi-informa-
tion display

279

5-4. Using the driving support systems

ivin
g

available from the navigation system,
the sign will be displayed on the multi-
information display.



When the driving support system
information display is selected, a
maximum of 3 signs can be dis-
played. (



P.164)



When a tab other than the driving
support system information display
is selected, the following types of
road signs will be displayed.
(



P.164)

• Speed limit begins/ends sign
• Speed limit related information sign

(Motorway, Expressway, Urban area,
Residential area)

• End of prohibition sign

• No-entry sign

(when notification is nec-

essary)

• Speed limit with supplemental sign

(Ramp way only)

: For vehicles with navigation system

If signs other than speed limit signs are rec-
ognized, they will be displayed in an over-
lapping stack under the current speed limit
sign.

The following types of road signs,
including electronic signs and blinking
signs, are displayed.

A non-official (not meeting the Vienna
Convention) or a recently introduced traf-
fic sign may not be displayed.



Speed limit road signs

: Speed limit begins/Maximum

speed zone begins

: Speed limit ends/Maximum

speed zone ends

: No speed limit information

is dis-

played when speed limit sign or speed
limit related sign information is not avail-
able.



Speed limit related information

*1, 2

: Motorway entrance

Supported types of road signs

280

5-4. Using the driving support systems

: Motorway exit

: Expressway entrance

: Expressway exit

: Urban area beginning

: Urban area ending

: Urban area beginning

: Urban area ending

: Residential area beginning

: Residential area ending

: Displayed when a sign is recognized

but speed limit information for the road
is not available from the navigation sys-
tem

: No speed limit information

is dis-

played when speed limit sign or speed
limit related sign information is not
available.



No-overtaking road signs

: No overtaking begins

: No overtaking ends



Other road signs

: No-entry

: End of prohibition

: Stop

: For vehicles with navigation system



Speed limit with supplemental
mark

: Wet

: Rain

: Ice

: Supplemental mark exists

: Exit ramp on right

: Exit ramp on left

: Time

: Displayed simultaneously with speed

limit.

: Contents not recognized.

: If the turn signal indicator is not oper-

ated when changing lanes, the mark
does not display.

281

5-4. Using the driving support systems

ivin
g

In the following situations, the RSA sys-
tem will notify the driver.



When the vehicle speed exceeds
the speed notification threshold of
the speed limit sign displayed, the
sign display will be emphasized and
a buzzer will sound.



When the RSA system recognizes a
no-entry sign and detects that the
vehicle has entered a no-entry area
based on the map information of the
navigation system, the no-entry sign
flashes and a buzzer will sound. (For
vehicles with navigation system)



If it is detected that your vehicle is
overtaking when a no overtaking
sign is displayed on the multi-infor-
mation display, the displayed sign
will flash and a steering wheel will
vibrate.
Depending on the situation, traffic
environment (traffic direction,
speed unit) may be detected incor-
rectly and a notification function
may not operate properly.

Setting procedure

Press

of the meter control

switches and select

Press

of the meter control

switches and select “Vehicle Settings”,

then press “OK”

Press

of the meter control

switches and select

, then press

“OK”

Press

of the meter control

switches and select “RSA”, then press

“OK”

Automatic turn-off of RSA sign display

One or more signs automatically turn off in

the following situations.

No sign has been recognized for a cer-

tain distance.

The road changes due to a left or right

turn, etc.

Conditions in which the function may

not operate or detect correctly

In the following situations, RSA does not

operate normally and may not recognize

signs, display the incorrect sign, etc. How-

ever, this does not indicate a malfunction.

The front camera is misaligned due to a

strong impact being applied to the sen-

sor, etc.

Dirt, snow, stickers, etc. are on the wind-

shield near the front camera.

In inclement weather such as heavy rain,

fog, snow or sand storms.

Light from an oncoming vehicle, the sun,

etc. enters the front camera.

The sign is dirty, faded, tilted or bent.

The contrast of electronic sign is low.

All or part of the sign is hidden by the

leaves of a tree, a pole, etc.

The sign is only visible to the front camera

for a short amount of time.

The driving scene (turning, lane change,

etc.) is judged incorrectly.

If a sign not appropriate for the currently

traveled lane, but the sign exists directly

after a freeway branches, or in an adja-

cent lane just before merging.

Stickers are attached to the rear of the

preceding vehicle.

A sign resembling a system compatible

sign is recognized.

Side road speed signs may be detected

and displayed (if positioned in sight of the

front camera) while the vehicle is travel-

Notification function

282

5-4. Using the driving support systems

ing on the main road.

Roundabout exit road speed signs may

be detected and displayed (if positioned

in sight of the front camera) while travel-

ing on a roundabout.

The front of the vehicle is raised or low-

ered due to the carried load.

The surrounding brightness is not suffi-

cient or changes suddenly.

When a sign intended for trucks, etc. is

recognized.

The vehicle is driven in a country with a

different direction of traffic.

The navigation system map data is out-

dated.

The navigation system is not operating.

The speed information displayed on the

meter and on the navigation system may

be different due to the navigation system

using map data.

Speed limit sign display

If the power switch was last turned off while

a speed limit sign was displayed on the

multi-information display, the same sign dis-

plays again when the power switch is turned

to ON.

Customization

Some functions can be customized. (Cus-

tomizable features:



P.483)

Meter display

Multi-information display

Set speed

Indicators

Dynamic radar cruise con-
trol with full-speed range

In vehicle-to-vehicle distance con-
trol mode, the vehicle automati-
cally accelerates, decelerates and
stops to match the speed changes
of the preceding vehicle even if the
accelerator pedal is not depressed.
In constant speed control mode,
the vehicle runs at a fixed speed.
Use the dynamic radar cruise con-
trol with full-speed range on free-
ways and highways.



Vehicle-to-vehicle distance con-
trol mode (



P.285)



Constant speed control mode
(



P.289)

System components

A
B
C

283

5-4. Using the driving support systems

ivin
g

Operation switches

Vehicle-to-vehicle distance switch

“+RES” switch

Cruise control main switch

Cancel switch

“-SET” switch

WARNING

Before using dynamic radar cruise

control with full-speed range

Driving safely is the sole responsibility

of the driver. Do not rely solely on the

system, and drive safely by always pay-

ing careful attention to your surround-

ings.

The dynamic radar cruise control with

full-speed range provides driving

assistance to reduce the driver’s bur-

den. However, there are limitations to

the assistance provided.

Read the following conditions care-

fully. Do not overly rely on this system

and always drive carefully.

• When the sensor may not be correctly

detecting the vehicle ahead:



P.291

• Conditions under which the vehicle-

to-vehicle distance control mode may

not function correctly:



P.292

A
B
C
D

Set the speed appropriately depend-

ing on the speed limit, traffic flow, road

conditions, weather conditions, etc.

The driver is responsible for checking

the set speed.

Even when the system is functioning

normally, the condition of the preced-

ing vehicle as detected by the system

may differ from the condition

observed by the driver. Therefore, the

driver must always remain alert, assess

the danger of each situation and drive

safely. Relying solely on this system or

assuming the system ensures safety

while driving can lead to an accident,

resulting in death or serious injury.

Switch the dynamic radar cruise con-

trol with full-speed range setting to off,

using the cruise control main switch

when not in use.

Cautions regarding the driving assist

systems

Observe the following precautions, as

there are limitations to the assistance

provided by the system.

Failure to do so may cause an accident

resulting in death or serious injury.

Assisting the driver to measure follow-

ing distance

The dynamic radar cruise control with

full-speed range is only intended to

help the driver in determining the fol-

lowing distance between the driver’s

own vehicle and a designated vehicle

traveling ahead. It is not a mechanism

that allows careless or inattentive driv-

ing, and it is not a system that can assist

the driver in low-visibility conditions. It

is still necessary for driver to pay close

attention to the vehicle’s surroundings.

284

5-4. Using the driving support systems

WARNING

Assisting the driver to judge proper

following distance

The dynamic radar cruise control with

full-speed range determines whether

the following distance between the

driver’s own vehicle and a designated

vehicle traveling ahead is within a set

range. It is not capable of making any

other type of judgement. Therefore, it

is absolutely necessary for the driver to

remain vigilant and to determine

whether or not there is a possibility of

danger in any given situation.

Assisting the driver to operate the

vehicle

The dynamic radar cruise control with

full-speed range does not include

functions which will prevent or avoid

collisions with vehicles ahead of your

vehicle. Therefore, if there is ever any

possibility of danger, the driver must

take immediate and direct control of

the vehicle and act appropriately in

order to ensure the safety of all

involved.

Situations unsuitable for dynamic

radar cruise control with full-speed

range

Do not use dynamic radar cruise control

with full-speed range in any of the follow-

ing situations.
Doing so may result in inappropriate

speed control and could cause an acci-

dent resulting in death or serious injury.

Roads where there are pedestrians,

cyclists, etc.

In heavy traffic

On roads with sharp bends

On winding roads

On slippery roads, such as those cov-

ered with rain, ice or snow

On steep downhills, or where there

are sudden changes between sharp up

and down gradients

Vehicle speed may exceed the set

speed when driving down a steep hill.

At entrances to freeways and high-

ways

When weather conditions are bad

enough that they may prevent the sen-

sors from detecting correctly (fog,

snow, sandstorm, heavy rain, etc.)

When there is rain, snow, etc. on the

front surface of the radar or front cam-

era

In traffic conditions that require fre-

quent repeated acceleration and

deceleration

During emergency towing

When an approach warning buzzer is

heard often

Lexus UX 300e (2023 year). Manual in english - page 8