Lexus LX570 (2021 year). Manual in english - page 15

256

PCS (Pre-Collision System)



: If equipped

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 pedes-
trian is extremely high, the brakes are automatically applied to help avoid the
collision or help reduce the impact of the collision.

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



P. 260)

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4-5. Using the driving support systems

iving

◆

Pre-collision warning

When the system determines that
the possibility of a frontal collision is
high, a buzzer will sound and a warn-
ing message 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

When the system determines that the possibility of a frontal collision is high,
the system warns the driver. If the system 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 System (



P. 385) will control the damp-

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

258

4-5. Using the driving support systems

WARNING

■

Limitations of the pre-collision system

●

The driver is solely responsible for safe driving. Always drive safely, taking care to

observe your surroundings.

Do not use the pre-collision system instead of normal braking operations under any

circumstances. This system will not prevent collisions or lessen collision damage or

injury in every situation. Do not overly rely on this system. Failure to do so may lead to

an accident, 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 effectiveness 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 carefully. Do not overly rely on this system and always

drive carefully.
• Conditions under which the system may operate even if there is no possibility of a

collision:



P. 262

• Conditions under which the system may not operate properly:



P. 264

●

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, possibly leading to an

accident.

■

Pre-collision braking

●

When the pre-collision braking function is operating, a large amount of braking force

will be applied.

●

If the vehicle is stopped by the operation of the pre-collision braking function, 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 per-

formed by the driver. If the accelerator pedal is being depressed strongly or the steer-

ing wheel is being turned, the system may determine that the driver is taking evasive

action and possibly prevent the pre-collision braking function from operating.

●

In some situations, while the pre-collision braking function is operating, operation of

the function may be canceled if the accelerator pedal is depressed strongly or the

steering wheel is turned and the system determines that the driver is taking evasive

action.

●

If the brake pedal is being depressed, the system may determine that the driver is tak-

ing evasive action and possibly delay the operation timing of the pre-collision braking

function.

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4-5. Using the driving support systems

iving

WARNING

■

When to disable the pre-collision system

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 balancer

●

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 stable manner, such as when the vehicle has been

in an accident or is malfunctioning

●

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 specified 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

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4-5. Using the driving support systems

■

Disabling the pre-collision system

Press the PCS switch for 3 seconds or

more.

The PCS warning light will turn on

and a message will be displayed on

the multi-information display.
To enable the system, press the PCS

switch again.
The system is enabled each time the

engine switch is turned to IGNI-

TION ON mode.

■

Changing the pre-collision warning timing

Press the PCS switch to display the
current warning timing on the multi-
information display. Each time the
PCS switch is pressed with the
warning timing displayed, the warn-
ing timing will change as follows.

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.

Changing settings of the pre-collision system

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4-5. Using the driving support systems

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■

Operational conditions

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

detecting a pedestrian, vehicle speed is between approximately 7 and 50 mph [10

and 80 km/h].)

• The relative speed between your vehicle and the vehicle or pedestrian ahead is

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

●

Pre-collision brake assist:
• Vehicle speed is between approximately 20 and 110 mph (30 and 180 km/h). (For

detecting a pedestrian, vehicle speed is between approximately 20 and 50 mph

[30 and 80 km/h].)

• The relative speed between your vehicle and the vehicle or pedestrian ahead is

approximately 20 mph (30 km/h) or more.

●

Pre-collision braking:
• Vehicle speed is between approximately 7 and 110 mph (10 and 180 km/h). (For

detecting a pedestrian, vehicle speed is between approximately 7 and 50 mph [10

and 80 km/h].)

• The relative speed between your vehicle and the vehicle or pedestrian ahead is

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

The system may not operate in the following situations:

●

If a battery terminal has been disconnected and reconnected and then the vehicle has

not been driven for a certain amount of time

●

If the shift lever is in R

●

If VSC is disabled (only the pre-collision warning function will be operational)

●

If the low speed four-wheel drive indicator is illuminated (only the pre-collision warning

function will be operational)

262

4-5. Using the driving support systems

■

Pedestrian detection function

■

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 colli-

sion

●

In some situations such as the following, the system may determine that there is a possi-

bility of a frontal collision and operate.
• When passing a vehicle or pedestrian

• When changing lanes while overtaking a preceding vehicle

• When overtaking a preceding vehicle that is changing lanes

The pre-collision system detects pedestrians

based on the size, profile, and motion of a

detected object. However, a pedestrian 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. 266)

• When overtaking a preceding vehicle that

is making a left/right turn

• When passing a vehicle in an oncoming

lane that is stopped to make a right/left turn

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4-5. Using the driving support systems

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• When rapidly closing on a vehicle ahead

• If the front of the vehicle is raised or lowered, such as when the road surface is

uneven or undulating

• When approaching objects on the roadside, such as guardrails, utility poles, trees, or

walls

• When driving on a narrow path 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 protrusion

on the road surface or roadside

• When driving on a road where relative

location to vehicle ahead in an adjacent

lane may change, such as on a winding

road

• When there is a vehicle, pedestrian, or

object by the roadside at the entrance of a

curve

• 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.)

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4-5. Using the driving support systems

• 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 the vehicle is hit by water, snow, 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, broadcasting 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, 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 bicycle

• When approaching the side or front of a vehicle

• If a preceding vehicle has a small rear end, such as an unloaded truck

• When passing under an object (billboard,

etc.) at the top of an uphill road

• When driving through or under objects

that may contact the vehicle, such as thick

grass, tree branches, or a banner

• If a preceding vehicle has a low rear end,

such as a low bed trailer

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4-5. Using the driving support systems

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• 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 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, accelera-

tion or deceleration)

• When suddenly cutting behind a preceding 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 surrounding 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

• If your vehicle is skidding

• If the wheels are misaligned

• If a wiper blade is blocking the front camera

• The vehicle is wobbling.

• The vehicle is being driven at extremely high speeds.

• If a vehicle ahead has extremely high

ground clearance

• When a vehicle ahead is not directly in front

of your vehicle

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

ered

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4-5. Using the driving support systems

• When driving on a hill

• If the radar sensor or front camera is misaligned

●

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 3.2 ft. (1 m) or taller than approximately

6.5 ft. (2 m)

• Pedestrians wearing oversized clothing (a rain coat, long skirt, etc.), making their

silhouette obscure

• Pedestrians who are carrying large baggage, 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, guardrails, 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.)

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4-5. Using the driving support systems

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■

If the PCS warning light flashes or illuminates and a warning message is displayed on

the multi-information display

The pre-collision system may be temporarily unavailable or there may be a malfunction

in the system.

●

In the following situations, the warning light will turn off, the message will disappear and

the system will become operational when normal operating conditions return:
• When the radar sensor or front camera or the area around either sensor is hot, such

as in the sun

• When the radar sensor or front camera or the area around either sensor is cold,

such as in an extremely cold environment

• When a front sensor is dirty or covered with snow, etc.

• When the part of the windshield in front of the front camera is fogged up or covered

with condensation or ice (Defogging the windshield:



P. 413)

• If the front camera is obstructed, such as when the hood is open or a sticker is

attached to the windshield near the front camera

●

If the PCS warning light continues to flash or remains illuminated or the warning mes-

sage does not disappear even though the vehicle has returned to normal, the system

may be malfunctioning. Have the vehicle inspected by your Lexus dealer immediately.

■

If VSC is disabled

●

If VSC is disabled (



P. 386), 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

LDA (Lane Departure Alert)



When driving on roads with white (yellow) lines, this function alerts the driver
when the vehicle might depart from its lane.
The LDA system recognizes visible
white (yellow) lines with the front cam-
era on the upper portion of the front
windshield.

◆

Lane departure alert function

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

When the warning buzzer sounds or

the steering wheel vibrates, check

the surrounding road situation and

carefully operate the steering wheel

to move the vehicle back to the cen-

ter of the lane.



: If equipped

Summary of functions

Functions included in LDA system

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4-5. Using the driving support systems

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◆

Vehicle sway warning function

When the vehicle is swaying or
appears as if it may depart from its
lane multiple times, the warning
buzzer sounds and a message is dis-
played on the multi-information dis-
play to alert the driver.

WARNING

■

Before using LDA system

Do not rely solely upon the LDA system. The LDA 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 driving safely by pay-

ing careful attention to the surrounding 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.

■

To avoid operating LDA system by mistake

When not using the LDA system, use the LDA switch to turn the system off.

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4-5. Using the driving support systems

Press the LDA switch to turn the LDA
system on.

The LDA indicator illuminates.
Press the LDA switch again to turn the

LDA system off.
When the LDA system is turned on or

off, operation of the LDA system contin-

ues in the same condition the next time

the engine is started.

WARNING

■

Situations unsuitable for LDA system

Do not use the LDA system in the following 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.

●

Objects or patterns that could be mistaken for white (yellow) lines are present 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 in a construction zone.

■

Preventing LDA 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, con-

tact your Lexus dealer.

●

Do not install or place anything on the hood or grille. Also, do not install a grille guard

(bull bars, kangaroo bar, etc.).

●

If your windshield needs repairs, contact your Lexus dealer.

Turning LDA system on

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4-5. Using the driving support systems

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Lane departure alert function display

Displayed when the multi-informa-
tion display is switched to the driving
assist system information screen.

Indications on multi-information display



Inside of displayed white lines is
white



Inside of displayed white lines is
black

Indicates that the system is recognizing
white (yellow) lines. When the vehicle
departs from its lane, the white line dis-
played on the side the vehicle departs
from flashes orange.

Indicates that the system is not able to
recognize white (yellow) lines or is
temporarily canceled.

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