Lexus LC Cabriolet (2021 year). Manual in english

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4-5.Using the driving support systems

PCS (Pre-Collision System)



P.232

LKA (Lane-Keeping Assist)



P.240

Automatic High Beam



P.211

RSA (Road Sign Assist)



P.248

Dynamic radar cruise control with
full-speed range



P.252

: 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

WARNING

To avoid malfunction of the radar sen-

sor

Observe the following precautions.
Otherwise, the radar sensor may not

operate properly, possibly leading to an

accident resulting in death or serious

injury.

A
B

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4-5. Using the driving support systems

WARNING

Keep the radar sensor and the radar

sensor cover clean at all times.

Radar sensor

Radar sensor cover

If the front of the radar sensor or the front
or back of the radar sensor cover is dirty
or covered with water droplets, snow,
etc., clean it.
Clean the radar sensor and radar sensor
cover with a soft cloth to avoid damaging
them.

Do not attach accessories, stickers

(including transparent stickers) or

other items to the radar sensor, radar

sensor cover or surrounding area.

Do not subject the radar sensor or its

surrounding area to a strong impact.

If the radar sensor, front grille, or front

bumper has been subjected to a

strong impact, have the vehicle

inspected by 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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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.307)

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.

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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

as when the vehicle is in the sun or in an extremely cold environment

• When the front camera cannot detect objects in front of the vehicle, such as when driving

in the dark, snow, or fog, or when bright lights are shining into the front camera

Situation

Actions

When the area around a sensor is covered
with dirt, moisture (fogged up, covered with
condensation, ice, etc.), or other foreign
matter

To clean the part of the windshield in front of
the front camera, use the windshield wipers
or the windshield defogger of the air condi-
tioning system (



P.307).

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.

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4-5. Using the driving support systems

The countries and areas for each region listed in the table are current as of June
2020. However, depending on when the vehicle was sold, the countries and areas
of each region may be different. Contact your Lexus dealer for details.

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.

PCS (Pre-Collision System)

The pre-collision system uses a radar sensor and front camera to detect vehi-
cles and pedestrians

in front of your vehicle. When the system determines

that the possibility of a frontal collision with a vehicle or pedestrian 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
determines that the possibility of a frontal collision with a vehicle or pedestrian
is extremely high, the brakes are automatically applied to help avoid the colli-
sion or help reduce the impact of the collision.

The pre-collision system can be disabled/enabled and the warning timing can be
changed. (



P.234)

: Depending on the region in which the vehicle was sold, the pedestrian detection

function may not be available. See the following table for details.

Detectable objects

Countries/areas

Function availability

Regions

Iceland, Ireland, United Kingdom, Italy, Ukraine,
Estonia, Austria, Netherlands, Cyprus, Greece,
Switzerland, Sweden, Spain, Slovakia, Slovenia,
Czech Republic, Germany, Norway, Hungary, Fin-
land, France, Bulgaria, Belgium, Poland, Portugal,
Latvia, Lithuania, Romania, Israel, Turkey, Canary
Islands

The pedestrian detection
function is available

Region A

Azerbaijan

The pedestrian detection
function is not available

Region B

System functions

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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

When the system determines that the
possibility of a frontal collision is high,
the system warns the driver. If the sys-
tem determines that the possibility of a
frontal collision is extremely high, the
brakes are automatically applied to
help avoid the collision or reduce the
collision speed.

Suspension control

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



P.291) will control the damping

force of the shock absorbers to help
maintain an appropriate vehicle pos-
ture.

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.

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.236

• Conditions under which the system

may not operate properly:



P.238

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.

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4-5. Using the driving support systems

Enabling/disabling the pre-colli-
sion system

The pre-collision system can be
enabled/disabled on

(



P.93) of

the multi-information display.

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

If the system is disabled, the PCS warn-

WARNING

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 2seconds. 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 engine running 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

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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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.93) of the

multi-information display.

The operation timing setting is retained
when the engine switch is turned off.

Far

The warning will begin to operate earlier
than with the default timing.

Middle

This is the default setting.

Near

The warning will begin to operate later
than with the default timing.

Operational conditions

Availability of the pedestrian detection

function depends on the region in which the

vehicle was sold. (For specific coun-

tries/areas:



P.232)

Read the following for details:



Region A

(The pedestrian detection function is

available)

The pre-collision system is enabled and the

system determines that the possibility of a

frontal collision with a vehicle or pedestrian

is high.
Each function is operational at the following

speeds:

Pre-collision warning:

• Vehicle speed is between approximately

10 and 180 km/h (7 and 110 mph). (For

detecting a pedestrian, vehicle speed is

between approximately 10 and 80 km/h

[7 and 50 mph].)

• The relative speed between your vehicle

and the vehicle or pedestrian ahead is

approximately 10 km/h (7 mph) or more.

Pre-collision brake assist:

• Vehicle speed is between approximately

30 and 180 km/h (20 and 110 mph). (For

detecting a pedestrian, vehicle speed is

between approximately 30 and 80 km/h

[20 and 50 mph].)

• The relative speed between your vehicle

and the vehicle or pedestrian ahead is

approximately 30 km/h (20 mph) or

more.

Pre-collision braking:

• Vehicle speed is between approximately

10 and 180 km/h (7 and 110 mph). (For

detecting a pedestrian, vehicle speed is

between approximately 10 and 80 km/h

[7 and 50 mph].)

• The relative speed between your vehicle

and the vehicle or pedestrian ahead is

approximately 10 km/h (7 mph) or more.

The system may not operate in the following

situations:

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4-5. Using the driving support systems

If a battery terminal has been discon-

nected and reconnected and then the

vehicle has not been driven for a certain

amount of time

If the shift position is in R

If VSC is disabled (only the pre-collision

warning function will be operational)



Region B

(The pedestrian detection function is not

available)

The pre-collision system is enabled and the

system determines that the possibility of a

frontal collision with a vehicle is high.
Each function is operational at the following

speeds:

Pre-collision warning:

• Vehicle speed is between approximately

15 and 180 km/h (10 and 110 mph).

• The relative speed between your vehicle

and the vehicle ahead is approximately

10 km/h (7 mph) or more.

Pre-collision brake assist:

• Vehicle speed is between approximately

30 and 180 km/h (20 and 110 mph).

• The relative speed between your vehicle

and the vehicle ahead is approximately

30 km/h (20 mph) or more.

Pre-collision braking:

• Vehicle speed is between approximately

15 and 180 km/h (10 and 110 mph).

• The relative speed between your vehicle

and the vehicle ahead is approximately

10 km/h (7 mph) or more.

The system may not operate in the following

situations:

If a battery terminal has been discon-

nected and reconnected and then the

vehicle has not been driven for a certain

amount of time

If the shift position is in R

If VSC is disabled (only the pre-collision

warning function will be operational)

Pedestrian detection function

The pre-collision system detects pedestri-

ans based on the size, profile, and motion of

a detected object. However, a pedestrian

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

properly. (



P.238)

: For countries/areas specified as Region

B (



P.232), the pedestrian detection

function may not be available.

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 vehicle or pedestrian

• When changing lanes while overtaking a

preceding vehicle

• When overtaking a preceding vehicle

that is changing lanes

• When overtaking a preceding vehicle

that is making a left/right turn

• When passing a vehicle in an oncoming

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lane that is stopped to make a right/left

turn

• When driving on a road where relative

location to vehicle ahead in an adjacent

lane may change, such as on a winding

road

• When rapidly closing on a vehicle ahead

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

ered, such as when the road surface is

uneven or undulating

• When approaching objects on the road-

side, such as guardrails, utility poles,

trees, or walls

• When there is a vehicle, pedestrian

, or

object by the roadside at the entrance of

a curve

• When driving on a narrow path sur-

rounded by a structure, such as in a tun-

nel or on an iron bridge

• When there is a metal object (manhole

cover, steel plate, etc.), steps, or a protru-

sion on the road surface or roadside

• When a crossing pedestrian approaches

very close to the vehicle

• When passing through a place with a low

structure above the road (low ceiling,

traffic sign, etc.)

• When passing under an object (billboard,

etc.) at the top of an uphill road

• When rapidly closing on 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 the vehicle is hit by water, snow,

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4-5. Using the driving support systems

dust, etc. from a vehicle ahead

• When driving through steam or smoke

• When there are patterns or paint on the

road or a wall that may be mistaken for a
vehicle or pedestrian

• 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

: For countries/areas specified as Region

B (



P.232), the pedestrian detection

function may not be available.

Situations in which the system may not

operate properly

In some situations such as the following, a

vehicle may not be detected by the radar

sensor and front camera, preventing the

system from operating properly:

• If an oncoming vehicle is approaching

your vehicle

• If a vehicle ahead is a motorcycle or bicy-

cle

• When approaching the side or front of a

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 is carrying a load which

protrudes past its rear bumper

• If a vehicle ahead has extremely high

ground clearance

• If a vehicle ahead is irregularly shaped,

such as a tractor or side car

• If the sun or other light is shining directly

on a vehicle ahead

• If a vehicle cuts in front of your vehicle or

emerges from beside a vehicle

• If a vehicle ahead makes an abrupt

maneuver (such as sudden swerving,

acceleration or deceleration)

• When suddenly cutting behind a preced-

ing vehicle

• When a vehicle ahead is not directly in

front of your vehicle

• When driving in inclement weather such

as heavy rain, fog, snow or a sandstorm

• When the vehicle is hit by water, snow,

dust, etc. from a vehicle ahead

• When driving through steam or smoke

• When driving in a place where the sur-

rounding brightness changes suddenly,

such as at the entrance or exit of a tunnel

• When a very bright light, such as the sun

or the headlights of oncoming traffic,

shines directly into the front camera

• When the surrounding area is dim, such

as at dawn or dusk, or while at night or in

a tunnel

• After the engine has started the vehicle

has not been driven for a certain amount

of time

• While making a left/right turn and for a

few seconds after making a left/right turn

• While driving on a curve and for a few

seconds after driving on a curve

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• 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 wobbling.

• 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

Some pedestrians such as the following

may not be detected by the radar sensor

and front camera, preventing the system
from operating properly

• Pedestrians shorter than approximately 1

m (3.2 ft.) or taller than approximately 2

m (6.5 ft.)

• Pedestrians wearing oversized clothing

(a rain coat, long skirt, etc.), making their

silhouette obscure

• Pedestrians who are carrying large bag-

gage, holding an umbrella, etc., hiding

part of their body

• Pedestrians who are bending forward or

squatting

• Pedestrians who are pushing a stroller,

wheelchair, bicycle or other vehicle

• Groups of pedestrians which are close

together

• Pedestrians who are wearing white and

look extremely bright

• Pedestrians in the dark, such as at night

or while in a tunnel

• Pedestrians whose clothing appears to

be nearly the same color or brightness as

their surroundings

• Pedestrians near walls, fences, guard-

rails, or large objects

• Pedestrians who are on a metal object

(manhole cover, steel plate, etc.) on the

road

• Pedestrians who are walking fast

• Pedestrians who are changing speed

abruptly

• Pedestrians running out from behind a

vehicle or a large object

• Pedestrians who are extremely close to

the side of the vehicle (outside rear view

mirror, etc.)

: For countries/areas specified as Region

B (



P.232), the pedestrian detection

function may not be available.

If VSC is disabled

If VSC is disabled (



P.292), 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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4-5. Using the driving support systems

Lane departure alert function

When the system determines that the
vehicle might depart from its lane, a
warning is displayed on the multi-infor-
mation display, and either the warning
buzzer sounds to alert the driver.

When the warning buzzer sounds, check

the surrounding road situation and care-
fully operate the steering wheel to move
the vehicle back to the center of the lane.

Steering assist function

When the system determines that the
vehicle might depart from its lane, the
system provides assistance as neces-
sary by operating the steering wheel in
small amounts for a short period of
time to keep the vehicle in its lane.

If the system detects that the steering
wheel has not been operated for a fixed
amount of time or the steering wheel is not
being firmly gripped, a warning is dis-
played on the multi-information display
and the function is temporarily canceled.

LKA (Lane-Keeping Assist)

When driving on highways and
freeways with white or yellow lines,
this function alerts the driver when
the vehicle might depart from its
lane and provides assistance by
operating the steering wheel to
keep the vehicle in its lane. Further-
more, the system also provides
steering assistance when dynamic
radar cruise control with full-speed
range is operating to keep the vehi-
cle in its lane.
The LKA system recognizes visible
white or yellow lines with the front
camera on the upper portion of the
front windshield.

Functions included in LKA sys-
tem

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4-5. Using the driving support systems

WARNING

Before using LKA system

Do not rely solely upon the LKA system.

The LKA system does not automatically

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 driv-

ing safely by paying careful attention to

the surrounding conditions and operat-

ing 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.

To avoid operating LKA system by

mistake

When not using the LKA system, use the

LKA switch to turn the system off.

Situations unsuitable for LKA system

Do not use the LKA system in the follow-

ing situations.

The system may not operate properly

and lead to an accident, resulting in

death or serious injury.

A spare tire, tire chains, etc. are

equipped.

When the tires have been excessively

worn, or when the tire inflation pres-

sure is low.

Tires which differ by structure, manu-

facturer, brand or tread pattern are

used.

Objects or patterns that could be mis-

taken for white (yellow) lines are pres-

ent on the side of the road (guardrails,

curbs, reflective poles, etc.).

Vehicle is driven on a snow-covered

road.

White (yellow) lines are difficult to see

due to rain, snow, fog, dust, etc.

Asphalt repair marks, white (yellow)

line marks, etc. are present due to road

repair.

Vehicle is driven in a temporary lane

or restricted lane due to construction

work.

Vehicle is driven on a road surface

which is slippery due to rainy weather,

fallen snow, freezing, etc.

Vehicle is driven in traffic lanes other

than on highways and freeways.

Vehicle is driven in a construction

zone.

Preventing LKA system malfunctions

and operations performed by mistake

Do not modify the headlights or place

stickers, etc. on the surface of the

lights.

Lexus LC Cabriolet (2021 year). Manual in english - page 10