LEXUS LS 500 (2019 year). Instruction

204

4-5. Using the driving support systems

LS500_OM_(U)_1809

■

Pedestrian alert

When the system determines that
there is a possibility of a frontal collision
with a stationary or moving pedestrian
in front of your vehicle, a message will
be displayed on the head-up display to
warn the driver.

■

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.

■

Active steering assist

If the system determines that the possi-

PCS (Pre-Collision System)
(vehicles with Lexus Safety
System + A)

The pre-collision system uses a
front radar sensor and front camera
to detect vehicles and pedestri-
ans/bicyclists in front of your vehi-
cle and front side radar sensors to
detect vehicles approaching from
the front left or right side. When the
system determines that the possi-
bility of a frontal collision with a
vehicle or pedestrian/bicyclist 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 a vehicle or pedes-
trian/bicyclist 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 dis-
abled/enabled and the warning tim-
ing can be changed. (

P.208)

System functions

205

4-5. Using the driving support systems

LS500_OM_(U)_1809

Driving

bility of a collision with an object, such
as a guardrail, or pedestrian is high,
even though the brakes are applied,
and that the collision may be avoidable
through steering control, the system
will steer the vehicle automatically to
help avoid the collision or help reduce
the impact of the collision.

■

Pre-collision seat belts (front seat
only)

If the system determines that the possi-
bility of a frontal collision is high, the
system will retract the seat belts. Addi-
tionally, the system may retract the seat
belts if the brakes are applied suddenly
or control of the vehicle is lost.

■

Pre-collision seatbacks (front pas-
senger’s seat / power rear seat [if
equipped])

If the system determines that the possi-
bility of a frontal collision is high, it may
move the seatbacks of the front pas-
senger’s seat and power rear seats to
the upright position automatically, if
reclined.

If a seat is being adjusted, it may not be
moved by the pre-collision seat function.

■

Suspension control

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

P.295) will control the damp-

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

■

Steering control

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.295) 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 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.210

• Conditions under which the system

may not operate properly:

P.212

●

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.

206

4-5. Using the driving support systems

LS500_OM_(U)_1809

WARNING

■

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.

■

Active steering assist

●

The steering wheel may turn automati-

cally when active steering assist is

operating.

●

As active steering assist operation will

be canceled when the system deter-

mines that a collision has been

avoided, operate the steering wheel as

necessary.

●

In the following situations, the system

may determine that the driver is taking

evasive action. In this case, the active

steering assist may not operate or may

be canceled.

• If the accelerator pedal is being

depressed strongly or the steering

wheel is being operated. In this case

the system may determine that the

driver is taking evasive action and the

pre-collision braking may not operate.

• In some situations, while the active

steering assist 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.

• When the active steering assist is

operating, if the steering wheel is held

firmly or is operated in the opposite

direction to that which the system is

generating torque, the function may be

canceled.

• If the brake pedal is depressed, the sys-

tem may determine that the driver is

taking evasive action and the active

steering assist operation may be

delayed.

■

Pre-collision seat belts with comfort

function

If the pre-collision seat belts have oper-

ated and the seat belts are locked in a

retracted position, immediately stop the

vehicle in a safe place, release and

retract the seat belts to unlock them and

then fasten them again.
Also, if a seat belt can be loosened, it can

be unlocked by slightly retracting it with-

out releasing it.

■

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

207

4-5. Using the driving support systems

LS500_OM_(U)_1809

Driving

■

Enabling/disabling the pre-colli-
sion system

The pre-collision system can be
enabled/disabled on

(

P.80) 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 warn-
ing light will turn on and a message will
be displayed on the multi-information
display.
If the pre-collision system is disabled,
the pedestrian alert system will also be
disabled. At this time, the FCTA (Front
Cross Traffic Alert) (

P.222) system

will also be disabled.

■

Enabling/Disabling the pedestrian
alert system

The pedestrian alert can be
enabled/disabled on

(

P.80) of

the multi-information display. At this
time, the FCTA (Front Cross Traffic
Alert) system will also be enabled/dis-
abled.

WARNING

●

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 dyna-

mometer or speedometer tester, or

when using an on vehicle wheel bal-

ancer

●

When a strong impact has been

applied to the front bumper, rear

bumper or front grille, due to an acci-

dent 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 a radar sensor or the front

camera is temporarily installed to the

vehicle

Changing settings of the pre-col-
lision system

208

4-5. Using the driving support systems

LS500_OM_(U)_1809

■

Changing the pre-collision warn-
ing timing

The pre-collision warning timing can
be changed on

(

P.80) of the

multi-information display. The warning
timing for the pedestrian and FCTA
(Front Cross Traffic Alert) system will
also be changed.

The warning timing setting is retained
when the engine 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

■

Changing the pedestrian alert tim-
ing

If the pre-collision warning timing is
changed, the pedestrian alert and
FCTA (Front Cross Traffic Alert) timing
will also be changed accordingly.

■

Operational conditions

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

collision with a vehicle, pedestrian/bicyclist, guardrail, etc. or a front side collision with a

vehicle is high. Each function is operational at the following speeds:

●

Pedestrian alert

●

Pre-collision warning

objects

Vehicle speed

Pedestrians

Approx. 20 to 40 mph (30 to 65 km/h)

objects

Vehicle speed

Relative speed between your

vehicle and object

Preceding vehicles

Approx. 3 to 110 mph (5 to

180 km/h)

Approx. 3 to 110 mph (5 to

180 km/h)

Bicyclists and pedestrians

Approx. 3 to 50 mph (5 to

80 km/h)

Approx. 3 to 50 mph (5 to

80 km/h)

209

4-5. Using the driving support systems

LS500_OM_(U)_1809

Driving

●

Pre-collision brake assist

●

Pre-collision braking

●

Active steering assist

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 position is in R

●

If VSC is disabled (only the pedestrian alert and pre-collision warning function will be

operational)

●

When there is insufficient safe or unobstructed space for the vehicle to be steered into

●

When an object is approaching the area the vehicle is to be steered into

■

Vehicle, pedestrian or bicyclist detec-

tion function

The pre-collision system detects vehicles,

pedestrians and bicyclists based on the size,

profile, and motion of the person. However,

objects

Vehicle speed

Approaching vehicle speed

Vehicles approaching from

the front left or right side

Approx. 7 to 37 mph (10 to

60 km/h)

Approx. 10 to 37 mph (15 to

60 km/h)

objects

Vehicle speed

Relative speed between your

vehicle and object

Preceding vehicles

Approx. 20 to 110 mph (30

to 180 km/h)

Approx. 20 to 110 mph (30

to 180 km/h)

Bicyclists and pedestrians

Approx. 20 to 50 mph (30

to 80 km/h)

Approx. 20 to 50 mph (30

to 80 km/h)

objects

Vehicle speed

Approaching vehicle speed

Vehicles approaching from

the front left or right side

Approx. 19 to 37 mph (30 to

60 km/h)

Approx. 10 to 37 mph (15 to

60 km/h)

objects

Vehicle speed

Relative speed between your

vehicle and object

Preceding vehicles

Approx. 3 to 110 mph (5 to

180 km/h)

Approx. 3 to 110 mph (5 to

180 km/h)

Bicyclists and pedestrians

Approx. 3 to 50 mph (5 to

80 km/h)

Approx. 3 to 50 mph (5 to

80 km/h)

objects

Vehicle speed

Pedestrians

Approx. 25 to 40 mph (40 to 65 km/h)

Guardrail

Approx. 37 to 50 mph (60 to 80 km/h)

210

4-5. Using the driving support systems

LS500_OM_(U)_1809

a vehicle, pedestrian or bicyclist may not be

detected depending on the surrounding

brightness and the motion, posture, and

angle of the person, preventing the system

from operating properly. (

P.212)

The illustration shows an image of vehicles,

pedestrians and bicyclists.

■

Cancelation of pre-collision braking

and active steering assist

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, pedestrian or

bicyclist

• When changing lanes while overtaking a

vehicle, pedestrian or bicyclist

• When approaching a vehicle, pedestrian

or bicyclist 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 vehicle,

pedestrian, bicyclist, etc.

• When approaching objects on the road-

side, such as vehicle, pedestrian, bicyclist,

guardrails, traffic signs, utility poles, street

lights, trees, walls, etc.

• When there is a vehicle, pedestrian, bicy-

clist or 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

vehicle, pedestrian or bicyclist

• When the front of your vehicle is hit by

water, snow, dust, etc.

• When overtaking a vehicle, pedestrian or

bicyclist that is changing lanes or making

a right/left turn

• When passing a vehicle, pedestrian or

bicyclist in an oncoming lane that is

stopped to make a right/left turn

• When a vehicle, pedestrian or bicyclist

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

211

4-5. Using the driving support systems

LS500_OM_(U)_1809

Driving

• 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, dips, or a

protrusion on the road surface or road-

side

• When a crossing pedestrian or bicyclist

approaches very close to the vehicle

• When passing through a place with a low

structure above the road such as a low

ceiling, underpass, bridge girder, traffic

sign, etc.

• When passing under an object (road

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 the 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

• When passing an oncoming vehicle on a

narrow road

• When driving close to objects such as

walls or poles on a median

• When passing an oncoming vehicle

around a sharp curve

• When passing a vehicle which is making

a left/right turn

• When being passed by a vehicle

approaching from the left or right side in

front of your vehicle

• When making a left/right turn while a

vehicle is approaching from the left or

right side in front of your vehicle

212

4-5. Using the driving support systems

LS500_OM_(U)_1809

• When passing an object on the side of the

road, such as a parked vehicle

• When passing an oncoming vehicle on a

S curve

• When there is an object that may be mis-

taken for a pedestrian, such as a utility

pole, tree, or pole on the roadside or at

the entrance of a curve

• When there is a bicycle or motorcycle on

the roadside at the entrance of a curve

• If the preceding vehicle is a bicycle or

motorcycle

●

The system may operate the pedestrian

alert unnecessarily if it detects the follow-

ing:

• Pedestrians on a sidewalk

• Bicycles and motorcycles

• Patterns or paint on the road, a wall,

median, billboard, etc. that may be mis-

taken for a pedestrian or bicyclist

■

Situations in which the system may not

operate properly

●

In some situations, such as the following,

a vehicle, pedestrian or bicyclist may not

be detected by the sensors, preventing

the system from operating properly:

• When a vehicle, pedestrian or bicyclist is

approaching your vehicle

• When your vehicle or a vehicle, pedes-

trian or bicyclist is wobbling

• If a vehicle, pedestrian or bicyclist makes

an abrupt maneuver (such as sudden

swerving, acceleration or deceleration)

• When your vehicle approaches a vehicle,

pedestrian or bicyclist rapidly

• When a vehicle, pedestrian or bicyclist is

not directly in front of your vehicle

• When a vehicle, pedestrian or bicyclist is

near a wall, fence, guardrail, manhole

cover, vehicle, steel plate on the road, etc.

• When a vehicle, pedestrian or bicyclist is

under a structure

• When part of a vehicle, pedestrian or

bicyclist is hidden by an object, such as

large baggage, an umbrella, or guardrail

• When multiple vehicles, pedestrians or

bicyclists are close together

• If the sun or other light is shining directly

on a vehicle, pedestrian, bicyclist or

guardrail ahead

• When a vehicle, pedestrian or bicyclist is

a shade of white and looks extremely

bright

• When a vehicle, pedestrian or bicyclist

appears to be nearly the same color or

brightness as its surroundings

• If a vehicles, pedestrians or bicyclists 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 per-

sonal 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

213

4-5. Using the driving support systems

LS500_OM_(U)_1809

Driving

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

mately 6.5 ft. (2 m)

• 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, wheel-

chair, 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 vehicle, pedestrian or

bicyclist 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

• When driving in a location where there

are many objects which reflect radar,

such as a tunnel or parking garage

• 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 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

• If the headlights are misaligned

• When approaching a guardrail at a wide

or narrow angle

• When a vehicle approaches your vehicle

from the front left or right side while your

vehicle is entering an intersection with

poor visibility

• When a vehicle approaches your vehicle

from the rear left or right side

• When a vehicle approaches the side of

your vehicle at a shallow angle

• When driving on a road with a grade that

changes sharply (sharp incline/decline)

• Pedestrians and bicyclists which are not

illuminated by the headlights at night, in a

tunnel, etc.

• Pedestrians and bicyclists which change

speed or direction abruptly

• Pedestrians and bicyclists which suddenly

emerge from behind a vehicle or large

object

• Pedestrians and bicyclists which are

extremely close to the side of the vehicle

(outside rear view mirror, etc.)

214

4-5. Using the driving support systems

LS500_OM_(U)_1809

●

In some situations, such as the following,

the sensors may not detect the lane lines

or a safe space the vehicle can be steered

into, preventing the active steering assist

from operating properly:

• When the white (yellow) lane lines are

difficult to see, such as when they are

faint, diverging/merging, or a shadow is

cast upon them

• When the lane is more wide or narrow

than normal

• When there is a light and dark pattern on

the road surface, such as due to road

repairs

• If the system determines that a collision

can be avoided by only using the brakes

• When a pedestrian is detected near the

centerline of the vehicle

●

In some situations such as the following,

sufficient braking force or steering force

may not be obtained, preventing the sys-

tem 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 there are deep ruts in the road

• When driving on a slope

• When driving on a horizontally slanted

road

●

Some guardrails, such as the following,

may not be detected by the sensors, pre-

venting the system from operating prop-

erly:

• Guardrails which are less than approxi-

mately 1.9 ft. (60 cm) tall

• Short guardrails

• Irregularly-shaped guardrails (wire cable

guardrails, guardrails made of thin poles,

etc.)

• Guardrails which are not illuminated by

the headlights at night, in a tunnel, etc.

• Guardrails which appear to be nearly the

same color or brightness as their sur-

roundings

• Guardrails which appear to be nearly the

same shape as their surroundings (walls,

etc.)

• Guardrails which are over a metal object

(manhole cover, steel plate, etc.)

• Guardrails which are hidden behind thick

grass

• Guardrails which are extremely close to

the side of the vehicle (outside rear view

mirror, etc.)

• Curved guardrails or guardrails at the

entrance of a curve

●

In some situations such as the following,

the system may detect a pedestrian and

display a warning on the head-up display,

even though no pedestrian exists:

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

ered, such as when the road surface is

uneven or undulating (due to ruts, etc.)

• When driving on a slope

• When driving on a horizontally slanted

road

• If the driver’s posture (driver seat posi-

tion) is extreme, such as excessively

reclined

• If the head-up display position is set

extremely high

■

If VSC is disabled

●

If VSC is disabled (

P.294), the pre-col-

lision brake assist and pre-collision brak-

ing 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.

215

4-5. Using the driving support systems

LS500_OM_(U)_1809

Driving

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.

■

Pre-collision seatbacks (front pas-
senger’s seat / power rear seat [if
equipped])

If a seat is being adjusted, it may not be
moved by the pre-collision seat function.

■

Suspension control

When the system determines that the
possibility of a frontal collision is high,

PCS (Pre-Collision System)
(vehicles with Lexus Safety
System + 2.0)

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

P.215) in front of

the vehicle. When the system
determines 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.217)

Detectable objects

System functions

216

4-5. Using the driving support systems

LS500_OM_(U)_1809

the Adaptive Variable Suspension Sys-
tem (

P.295) will control the damp-

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

■

Steering control

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.295) 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 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.219

• Conditions under which the system

may not operate properly:

P.220

●

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

217

4-5. Using the driving support systems

LS500_OM_(U)_1809

Driving

■

Enabling/disabling the pre-colli-
sion system

The pre-collision system can be
enabled/disabled on

(

P.80) 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 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.80) of the

multi-information display.

WARNING

●

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 dyna-

mometer 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 cam-

era is temporarily installed to the vehi-

cle

Changing settings of the pre-col-
lision system

218

4-5. Using the driving support systems

LS500_OM_(U)_1809

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 frontal

collision with a detected object is high.

Each function is operational at the following speed

●

Pre-collision warning

●

Pre-collision brake assist

Detectable objects

Vehicle speed

Relative speed between your

vehicle and object

Vehicles

Approx. 7 to 110 mph (10 to
180 km/h)

Bicyclists and pedestrians

Approx. 7 to 50 mph (10 to
80 km/h)

Detectable objects

Vehicle speed

Relative speed between your

vehicle and object

Vehicles

Approx. 20 to 110 mph (30
to 180 km/h)

Bicyclists and pedestrians

Approx. 20 to 50 mph (30
to 80 km/h)

219

4-5. Using the driving support systems

LS500_OM_(U)_1809

Driving

●

Pre-collision braking

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 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 sur-

rounding brightness and the motion, pos-

ture, and angle of the detected object,

preventing the system from operating prop-

erly. (

P.220)

The illustration shows an image of detect-

able objects.

■

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 detectable object or other

object by the roadside at the entrance of

a curve

Detectable objects

Vehicle speed

Relative speed between your

vehicle and object

Vehicles

Approx. 7 to 110 mph (10 to
180 km/h)

Bicyclists and pedestrians

Approx. 7 to 50 mph (10 to
80 km/h)

LEXUS LS 500 (2019 year). Instruction - part 13