Lexus GS350 (2020 year). Manual in english - page 15

240

The pre-collision system is equipped with a sophisticated computer that will
record certain data, such as:

• Accelerator status
• Brake status
• Vehicle speed
• Operation status of the pre-collision system functions
• Information (such as the distance and relative speed between your vehicle

and the vehicle ahead or other objects)

• Images from the camera sensor (available only when the pre-collision braking

function or the pre-collision brake assist function was operating)

The pre-collision system does not record conversations, sounds or images of the
inside of the vehicle.

●

Data usage
Lexus may use the data recorded in this computer to diagnose malfunctions,
conduct research and development, and improve quality.
Lexus will not disclose the recorded data to a third party except:

• With the consent of the vehicle owner or with the consent of the lessee if

the vehicle is leased

• In response to an official request by the police, a court of law or a govern-

ment agency

• For use by Lexus in a lawsuit
• For research purposes where the data is not tied to a specific vehicle or

vehicle owner

●

Recorded images can be erased using a specialized device.
The image recording function can be disabled. However, if the function is dis-
abled, data from when the pre-collision system operates will not be available.

Vehicle data recording

241

4-5. Using the driving support systems

iving

Two types of sensors, located behind the front grille and windshield, detect infor-
mation necessary to operate the drive assist systems.

Radar sensor
Camera sensor

Sensors

WARNING

■

To avoid malfunction of the radar sensor

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 front grille emblem clean at all times.

●

Do not attach accessories, stickers (including transparent stickers) or other items to

the radar sensor, front grille emblem or surrounding area.

●

Do not subject the radar sensor or 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 your Lexus dealer.

●

Do not disassemble the radar sensor.

●

Do not modify or paint the radar sensor, front grille emblem or surrounding area.

●

If the radar sensor, front grille, or front bumper needs to be removed and installed, or

replaced, contact your Lexus dealer.

Radar sensor
Front grille emblem

If the front of the radar sensor or the front or

back of the front grille emblem is dirty or

covered with water droplets, snow, etc., clean

it.

Clean the radar sensor and front grille

emblem with a soft cloth so you do not mark

or damage them.

242

4-5. Using the driving support systems

WARNING

■

To avoid malfunction of the camera sensor

Observe the following precautions.
Otherwise, the camera sensor may not operate properly, possibly leading to an acci-

dent 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.,

clear 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 wind-

shield in front of the camera sensor.

• If the inner side of the windshield where the camera sensor is installed is dirty, con-

tact your Lexus dealer.

●

If the part of the windshield in front of the camera sensor is fogged up or covered with

condensation or ice, use the windshield defogger to remove the fog, condensation or

ice. (



P. 324)

●

If water droplets cannot be properly removed from the area of the windshield in front

of the camera sensor by the windshield wipers, replace the wiper insert or wiper

blade.

If the wiper inserts or wiper blades need to be replaced, contact your Lexus dealer.

●

Do not attach window tinting to the windshield.

●

Replace the windshield if it is damaged or cracked.

If the windshield needs to be replaced, contact your Lexus dealer.

●

Do not get the camera sensor wet.

●

Do not allow bright lights to shine into the camera sensor.

●

Do not dirty or damage the camera sensor.

When cleaning the inside of the windshield, do not allow glass cleaner to contact the

lens. Also, do not touch the lens.

If the lens is dirty or damaged, contact your Lexus dealer.

●

Do not subject the camera sensor to a strong impact.

●

Do not change the installation position or direction of the camera sensor or remove it.

●

Do not disassemble the camera sensor.

●

Do not attach objects, such as stickers, trans-

parent stickers, and so forth, to the outer side

of the windshield in front of the camera sensor

(shaded area in the illustration).
A: From the top of the windshield to approxi-

mately 0.4 in. (1 cm) below the bottom of the

camera sensor
B: Approximately 7.9 in. (20 cm) (Approxi-

mately 4.0 in. (10 cm) to the right and left

from the center of the camera sensor)

243

4-5. Using the driving support systems

iving

■

Certification



For vehicles sold in the U.S.A., Hawaii, Guam and Puerto Rico

WARNING

●

Do not modify any components of the vehicle around the camera sensor (inside rear

view mirror, etc.) or ceiling.

●

Do not attach any accessories that may obstruct the camera sensor to the hood, front

grille or front bumper. Contact your Lexus dealer for details.

●

If a surfboard or other long object is to be mounted on the roof, make sure that it will

not obstruct the camera sensor.

●

Do not modify the headlights or other lights.

245

4-5. Using the driving support systems

iving

PCS (Pre-Collision System)



◆

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.



: If equipped

The pre-collision system uses a radar sensor and camera sensor to detect
vehicles 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. 248)

246

4-5. Using the driving support systems

◆

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 (if equipped)

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



P. 298) will control the damping

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

◆

Steering control (if equipped)

When the system determines that the possibility of a frontal collision is high
and the driver is operating the steering wheel, the LDH system (



P. 298) will

control the turning angle of the front and rear wheels and effort necessary to
turn the steering wheel to help enhance steering responsiveness.

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. 250

• Conditions under which the system may not operate properly:



P. 253

●

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.

247

4-5. Using the driving support systems

iving

WARNING

■

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.

■

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 camera sensor is

temporarily installed to the vehicle

248

4-5. Using the driving support systems

■

Enabling/disabling the pre-collision system

The pre-collision system can be enabled/disabled on

(



P. 106, 114)

of the multi-information display.

The system is automatically enabled each time the engine switch is turned to IGNI-

TION ON mode.

If the system is disabled, the PCS
warning light will turn on and a mes-
sage will be displayed on the multi-
information display.

■

Changing the pre-collision warning timing

The pre-collision warning timing can be changed on

(



P. 106, 114)

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.

Changing settings of the pre-collision system

249

4-5. Using the driving support systems

iving

■

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)

250

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. 254)

• 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

251

4-5. Using the driving support systems

iving

• 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.)

252

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

• 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

253

4-5. Using the driving support systems

iving

■

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 camera sensor, 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

• 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 camera sensor

• When the surrounding area is dim, such as at dawn or dusk, or while at night or in a

tunnel

• If a preceding vehicle has a low rear end,

such as a low bed trailer

• If a vehicle ahead has extremely high

ground clearance

• When a vehicle ahead is not directly in front

of your vehicle

254

4-5. Using the driving support systems

• 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 camera sensor

• The vehicle is wobbling.

• The vehicle is being driven at extremely high speeds.

• When driving on a hill

• If the radar sensor or camera sensor 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

camera sensor, 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 sil-

houette 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.)

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

ered

255

4-5. Using the driving support systems

iving

■

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 camera sensor or the area around either sensor is hot,

such as in the sun

• When the radar sensor or camera sensor 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 camera sensor is fogged up or cov-

ered with condensation or ice (Defogging the windshield:



P. 324)

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

attached to the windshield near the camera sensor

●

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. 300), 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.

256

4-5. Using the driving support systems

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 assis-
tance 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 vehicle in its lane.
The LKA system recognizes visible
white or yellow lines with the camera
sensor 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 LKA system

Content .. 13 14 15 16 ..