tires LEXUS LS500 2019 User Guide

222 4-5. Using the driving support systems
LS500_OM_(U)_1810 • If the wheels are misaligned
• If a wiper blade is blocking the front cam-
era
• The vehicle is being driven at extremely
high speeds
• When driving on a hill
• If the radar sensor or front camera is mis-
aligned●
In some situations such as the following,
sufficient braking force may not be
obtained, preventing the system from
performing properly:
• If the braking functions cannot operate to
their full extent, such as when the brake
parts are extremely cold, extremely hot,
or wet
• If the vehicle is not properly maintained
(brakes or tires are excessively worn,
improper tire inflation pressure, etc.)
• When the vehicle is being driven on a
gravel road or other slippery surface■
If VSC is disabled●
If VSC is disabled (  P.296), 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. *
: If equipped
When the system detects a vehicle
approaching from the left or right in
front of your vehicle when approaching
an intersection, a notification will be
displayed on the head-up display and
panoramic view monitor *
. *
: Refer to “NAVIGATION AND MULTI-
MEDIA SYSTEM OWNER’S MAN-
UAL”.
When the system determines that your
vehicle may be about to enter an inter-
section even though a vehicle is
approaching from the left or right in
front of your vehicle, a buzzer will
sound and a message will be displayed
on the multi-information display to
urge you to depress the brake pedal.
 Head-up displayFCTA (Front Cross Traffic
Alert) *
When approaching an intersection
at low speed, the radar sensors on
the front side of the vehicle can
detect approaching vehicles to the
left and right of the front of the vehi-
cle. In this case, the head-up display
is used to inform the driver of
detected vehicles.
FCTA system functions

226 4-5. Using the driving support systems
LS500_OM_(U)_1810 WARNING■
Before using LTA system
Do not rely solely upon the LTA system.
The LTA 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. ■
Situations unsuitable for LTA system
In the following situations, use the LTA
switch to turn the system off. Failure to do
so may lead to an acc ident, resulting in
death or serious injury. ●
Vehicle is driven on a road surface
which is slippery due to rainy weather,
fallen snow, freezing, etc.●
Vehicle is driven on a snow-covered
road.
●
White (yellow) lines are difficult to see
due to rain, snow, fog, dust, etc.
●
Vehicle is driven in a temporary lane or
restricted lane due to construction
work.
●
Vehicle is driven in a construction
zone.
●
A spare tire, tire chains, etc. are
equipped.
●
When the tires have been excessively
worn, or when the tire inflation pres-
sure is low.
●
When tires of a size other than speci-
fied are installed. ●
Vehicle is driven in traffic lanes other
than that highways and freeways. ●
During emergency towing. ■
Situations in whic h the lane change
assist function should not be used ●
When driving on a one lane road or
road without lane markers ●
When there is no broken white line
between your vehicle and the lane
toward which the turn signal is oper-
ated ■
Preventing LTA system malfunctions
and operations performed by mistake ●
Do not modify the headlights or place
stickers, etc. on the surface of the
lights. ●
Do not modify the suspension etc. If
the suspension etc. needs to be
replaced, contact 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, con-
tact your Lexus dealer. ■
Conditions in which functions may
not operate properly
In the following situations, the functions
may not operate properly and the vehicle
may depart from its la ne. Drive safely by
always paying careful attention to your
surroundings and operate the steering
wheel to correct the path of the vehicle
without relying solely on the functions.

228 4-5. Using the driving support systems
LS500_OM_(U)_1810 ■
Lane departure alert function
When the system determines that the
vehicle might depart from its lane or
course *
, a warning is displayed on the
multi-information display, and either a
warning buzzer will sound or the steer-
ing wheel will vibrate to alert the driver.
When the warning buzzer sounds or
the steering wheel vibrates, check the
area around your vehicle and carefully
operate the steering wheel to move the
vehicle back to the center of the lane.
When the system determines that the
vehicle might depart from its lane and
that the possibility of a collision with an
overtaking vehicle in the adjacent lane
is high, the lane departure alert will
operate even if the turn signals are
operating. *
: Boundary between asphalt and the side
of the road, such as grass, soil, or a curbWARNING●
The traffic lines are yellow (which may
be more difficult to recognize than
lines that are white).●
The white (yellow) lines cross over a
curb, etc.●
The vehicle is driven on a bright sur-
face, such as concrete.●
If the edge of the road is not clear or
straight.●
The vehicle is driven on a surface that
is bright due to reflected light, etc.●
The vehicle is driven in an area where
the brightness changes suddenly, such
as at the entrances and exits of tunnels,
etc.●
Light from the headlights of an oncom-
ing vehicle, the sun, etc. enters the
camera.●
The vehicle is driven on a slope.●
The vehicle is driven on a road which
tilts left or right, or a winding road.●
The vehicle is driven on an unpaved or
rough road.
●
The traffic lane is excessively narrow
or wide.
●
The vehicle is extremely tilted due to
carrying heavy luggage or having
improper tire pressure.
●
The distance to the preceding vehicle
is extremely short.
●
The vehicle is moving up and down a
large amount due to road conditions
during driving (poor roads or road
seams).
●
When driving in a tunnel or at night
with the headlights off or when a head-
light is dim due to its lens being dirty or
it being misaligned.
●
The vehicle is struck by a crosswind. ●
The vehicle is affected by wind from a
vehicle driven in a nearby lane. ●
The vehicle has just changed lanes
through operation of the steering
wheel by the driver or crossed an
intersection. ●
Tires which differ by structure, manu-
facturer, brand or tread pattern are
used. ●
Snow tires, etc. are equipped. ●
The vehicle is being driven at
extremely high speeds.
Functions included in LTA system

2554-5. Using the driving support systems
LS500_OM_(U)_1810 4
Driving ations:
• When the sensor is misaligned due to a
strong impact to the sensor or its sur-
rounding area
• When the distance between your vehicle
and a guardrail, wall, etc. that enters the
detection area is short
• When driving up an d down consecutive
steep inclines, such as hills, dips in the
road, etc.
• When vehicle lanes are narrow, or when
driving on the edge of a lane, and a vehi-
cle traveling in a lane other than the adja-
cent lanes enters the detection area
• When driving on roads with sharp bends,
consecutive curves, or uneven surfaces
• When the tires are slipping or spinning
• When the distance between your vehicle
and a following vehicle is short
• When an accessory (such as a bicycle
carrier) is installed to the rear of the vehi-
cle *
: If equipped
■
Intuitive parking assist (if
equipped)
Ultrasonic sensors are used to detect
static objects in the detection area
when driving at a low speed or backing
up. (  P.257) ■
RCTA (Rear Cross Traffic Alert)
function (if equipped)
Radar sensors are used to detect
approaching vehicles in the detection
areas behind the vehicle when backing
up. (  P.263) ■
RCD (Rear camera detection)
function (if equipped)
A rear camera sensor is used to detect
pedestrians in the detection area
behind the vehicle when backing up.
(  P.267)PKSA (Parking Support
Alert) *
The Parking Support Alert system
consists of the following functions
that operate when driving at a low
speed or backing up, such as when
parking. When the system deter-
mines that a collision with a
detected object, such as a wall, or
pedestrian is high, a warning oper-
ates to urge the driver to take eva-
sive action.
PKSA (Parking Support Alert)
system

2694-5. Using the driving support systems
LS500_OM_(U)_1810 4
Driving • Pedestrians who are bending forward or
squatting
• Pedestrians who are lying down
• Pedestrians who are running
• Pedestrians who suddenly enter the
detection area
• People riding a bicycle, skateboard, or
other light vehicle
• Pedestrians wearing oversized clothing
such as a rain coat, long skirt, etc., making
their silhouette obscure
• Pedestrians whose body is partially hid-
den by an object, such as a cart or
umbrella
• Pedestrians which are obscured by dark-
ness, such as at night●
In some situations, such as the following,
pedestrians may not be detected by the
rear camera detection function, prevent-
ing the function from operating properly:
• When backing up in inclement weather
(rain, snow, fog, etc.)
• When the rear camera is obscured (dirt,
snow, ice, etc. are attached) or scratched
• When a very bright light, such as the sun,
or the headlights of another vehicle,
shines directly into the rear camera
• When backing up in a place where the
surrounding brightness changes sud-
denly, such as at the entrance or exit of a
garage or underground parking lot
• When backing up in a dim environment
such as during dusk or in an underground
parking lot●
Even though there are no pedestrians in
the detection area, some objects, such as
the following, may be detected, possibly
causing the rear camera detection func-
tion to operate.
• Three dimensional objects, such as a
pole, traffic cone, fence, or parked vehi-
cle
• Moving objects, such as a car or motor-
cycle
• Objects moving toward your vehicle
when backing up, such as flags or pud-
dles (or airborne matter, such as smoke,
steam, rain, or snow)
• Cobblestone or gravel roads, tram rails,
road repairs, white lines, pedestrian
crossings or fallen leaves on the road
• Metal covers (gratings), such as those
used for drainage ditches • Objects reflected in a puddle or on a wet
road surface
• The roadside or bumps on the road
•Shadows on the road ●
In some situations, such as the following,
the rear camera detection function may
operate even though there are no pedes-
trians in the detection area.
• When backing up toward the roadside or
a bump on the road
• If the vehicle is signif icantly tilted, such as
when carrying a heavy load
• When backing up toward an
incline/decline
• If the suspension has been modified or
tires of a size othe r than specified are
installed
• If the rear of the vehicle is raised or low-
ered due to the carried load
• If an electronic component, such as a
backlit license plate or rear fog light, is
installed near the rear camera
• If a bumper protector, such as an addi-
tional trim strip, is installed to the rear
bumper
• If the orientation of the rear camera has
been changed
• If a towing eyelet is in stalled to the rear of
the vehicle
• When water is flowing over the rear cam-
era lens
• When the rear camera is obscured (dirt,
snow, ice, etc. are at tached) or scratched
• If there is a flashing light in the detection
area, such as the emergency flashers of
another vehicle ●
Situations in which the rear camera
detection function may be difficult to
notice
• If buzzer may be difficult to hear if the
surrounding area is noisy, the volume of
the audio system volume is high, the air
conditioning system is being used, etc.
• If the temperature in the cabin is
extremely high or low, the audio system
screen may not operate correctly.

278 4-5. Using the driving support systems
LS500_OM_(U)_1810 ■
The Parking Support Brake function
(static object) will operate when
The function will operate when the PKSB
OFF indicator is not illuminated or flashing
(  P.69, 70) and all of the following condi-
tions are met: ●
Engine output restriction control
• The Parking Support Brake is enabled.
• The vehicle speed is 9 mph (15 km/h) or
less.
• There is a static ob ject in the traveling
direction of the vehicle and 6 to 13 ft. (2
to 4 m) away.
• The Parking Support Brake determines
that a stronger-than-normal brake opera-
tion is necessary to avoid a collision. ●
Brake control
• Engine output restriction control is oper-
ating.
• The Parking Support Brake determines
that an immediate brake operation is nec-
essary to avoid a collision.
■
The Parking Support Brake function
(static objects) will stop operating when
The function will stop operating if any of the
following conditions are met:
●
Engine output restriction control
• The Parking Support Brake is disabled.
• The system determines that the collision WARNING●
If the area around a radar sensor is
subjected to an impact, the system
may not operate properly due to a
sensor malfunction. Have the vehicle
inspected by your Lexus dealer.■
Handling the suspension
Do not modify the suspension, as
changes to the height or inclination of the
vehicle may prevent the sensors from
detecting objects correctly or cause the
system to not operate or operate unnec-
essarily. ■
If the Parking Support Brake function
(static objects) operates unnecessar-
ily, such as at a railroad crossing
In the event that the Parking Support
Brake function (static objects) operates
unnecessarily, such as at a railroad cross-
ing, brake control w ill be canceled after
approximately 2 seconds, allowing you
to proceed forward and leave the area,
brake control can also be canceled by
depressing the brake pedal. Depressing
the accelerator pedal after brake control
is canceled will allow you to proceed for-
ward and leave the area. ■
Notes when washing the vehicle
Do not apply intensive bursts of water or
steam to the sensor area.
Doing so may result in the sensor mal-
functioning.
●
When using a high pressure washer to
wash the vehicle, do not spray the sen-
sors directly, as doing so may cause a
sensor to malfunction.
●
When using steam to clean the vehicle,
do not direct steam too close to the
sensors as doing so may cause a sen-
sor to malfunction.
■
When to disable the Parking Support
Brake
In the following situations, disable the
Parking Support Brake as the system
may operate even though there is no
possibility of a collision. ●
When inspecting the vehicle using a
chassis roller, chassis dynamo or free
roller ●
When loading the vehicle onto a boat,
truck or other transport vessel ●
If the suspension has been modified or
tires of a size othe r than specified are
installed ●
If the front of the vehicle is raised or
lowered due to the carried load ●
When equipment that may obstruct a
sensor is installed, such as a towing
eyelet, bumper protector (an addi-
tional trim strip, etc.), bicycle carrier, or
snow plow ●
When using an automatic car wash

2814-5. Using the driving support systems
LS500_OM_(U)_1810 4
Driving such as a backlit license plate (especially
fluorescent type), fog lights, fender pole
or wireless antenna is installed near a
sensor●
Changes in the vehicle posture
• If the vehicle is significantly tilted
• If the front of the vehicle is raised or low-
ered due to the carried load
• If the orientation of a sensor has been
changed due to a collision or other
impact
• When equipment that may obstruct a
sensor is installed, such as a bumper pro-
tector (an additional trim strip, etc.), bicy-
cle carrier, or snow plow
• If the suspension has been modified or
tires of a size other than specified are
installed
• If a sensor has been painted or covered
with a sticker, etc.

2854-5. Using the driving support systems
LS500_OM_(U)_1810 4
Driving ●
When equipment that may obstruct a
sensor is installed, such as a towing eye-
let, bumper protector (an additional trim
strip, etc.), bicycle carrier, or snow plow●
If the suspension has been modified or
tires of a size other than specified are
installed●
If the front of the vehicle is raised or low-
ered due to the carried load●
If an electronic component, such as a
backlit license plate (especially fluores-
cent type), fog lights, fender pole or wire-
less antenna is installed near a radar
sensor●
If the orientation of a radar sensor has
been changed●
When multiple vehicles are approaching
with only a small gap between each vehi-
cle●
If a vehicle is approaching the rear of
your vehicle rapidly ●
Situations in which the radar sensor may
not detect a vehicle
• When a vehicle approaches from the
right or left at the rear of the vehicle while
you are turning while backing up
• When turning while backing up
• When backing out of a shallow angle
parking spot • When backing up on a slope with a sharp
change in grade
• When a vehicle turns into the detection
area

288 4-5. Using the driving support systems
LS500_OM_(U)_1810 • People riding a bicycle, skateboard, or
other light vehicle
• Pedestrians wearing oversized clothing
such as a rain coat, long skirt, etc., making
their silhouette obscure
• Pedestrians whose body is partially hid-
den by an object, such as a cart or
umbrella
• Pedestrians which are obscured by dark-
ness, such as at night●
In some situations, such as the following,
pedestrians may not be detected by the
Parking Support Brake function (rear
pedestrians), preventing the function
from operating properly:
• When backing up in inclement weather
(rain, snow, fog, etc.)
• When the rear camera is obscured (dirt,
snow, ice, etc. are attached) or scratched
• When a very bright light, such as the sun,
or the headlights of another vehicle,
shines directly into the rear camera
• When backing up in a place where the
surrounding brightness changes sud-
denly, such as at the entrance or exit of a
garage or underground parking lot
• When backing up in a dim environment
such as during dusk or in an underground
parking lot●
Even though there are no pedestrians in
the detection area, some objects, such as
the following, may be detected, possibly
causing the Parking Support Brake func-
tion (rear pedestri ans) to operate.
• Three dimensional objects, such as a
pole, traffic cone, fence, or parked vehi-
cle
• Moving objects, such as a car or motor-
cycle
• Objects moving toward your vehicle
when backing up, such as flags or pud-
dles (or airborne matter, such as smoke,
steam, rain, or snow)
• Cobblestone or gravel roads, tram rails,
road repairs, white lines, pedestrian
crossings or fallen leaves on the road
• Metal covers (gratings), such as those
used for drainage ditches
• Objects reflected in a puddle or on a wet
road surface
• The roadside or bumps on the road
•Shadows on the road
●
In some situations, such as the following, the Parking Support Brake function (rear
pedestrians) may operate even though
there are no pedestrians in the detection
area.
• When backing up toward the roadside or
a bump on the road
• If the vehicle is signif icantly tilted, such as
when carrying a heavy load
• When backing up toward an
incline/decline
• If the suspension has been modified or
tires of a size othe r than specified are
installed
• If the rear of the vehicle is raised or low-
ered due to the carried load
• If an electronic component, such as a
backlit license plate or rear fog light, is
installed near the rear camera
• If a bumper protector, such as an addi-
tional trim strip, is installed to the rear
bumper
• If the orientation of the rear camera has
been changed
• If a towing eyelet is in stalled to the rear of
the vehicle
• When water is flowing over the rear cam-
era lens
• When the rear camera is obscured (dirt,
snow, ice, etc. are at tached) or scratched
• If there is a flashing light in the detection
area, such as the emergency flashers of
another vehicle

298 4-5. Using the driving support systems
LS500_OM_(U)_1810 (10 km/h) or more and the airbag sensor
detects a collision. (The Secondary Colli-
sion Brake will not operate when the vehicle
speed is below approximately 6 mph [10
km/h].) ■
Secondary Collision Brake automatic
cancellation
The Secondary Collision Brake is automati-
cally canceled in the following situations: ●
The vehicle speed drops below approxi-
mately 6 mph (10 km/h)●
A certain amount of time elapses during
operation●
The accelerator pedal is depressed a
large amount■
When “Check VGRS System” or
“CHECK DRS” is displayed on the
multi-information display
The VGRS or DRS may not operate prop-
erly. Have the vehicle inspected by your
Lexus dealer.
WARNING■
The ABS does not operate effectively
when●
The limits of tire gripping performance
have been exceeded (such as exces-
sively worn tires on a snow covered
road).
●
The vehicle hydroplanes while driving
at high speed on wet or slick roads.
■
Stopping distance when the ABS is
operating may exceed that of normal
conditions
The ABS is not designed to shorten the
vehicle’s stopping di stance. Always main-
tain a safe distance from the vehicle in
front of you, especially in the following
situations:
●
When driving on dirt, gravel or
snow-covered roads
●
When driving with tire chains
●
When driving over bumps in the road ●
When driving over roads with potholes
or uneven surfaces ■
TRAC/VSC may not operate effec-
tively when
Directional control and power may not
be achievable while driving on slippery
road surfaces, even if the TRAC/VSC
system is operating. Drive the vehicle
carefully in conditions where stability and
power may be lost. ■
Hill-start assist control does not oper-
ate effectively when ●
Do not overly rely on hill-start assist
control. Hill-start assist control may
not operate effectively on steep
inclines and roads covered with ice. ●
Unlike the parking brake, hill-start
assist control is not intended to hold
the vehicle stationary for an extended
period of time. Do not attempt to use
hill-start assist control to hold the vehi-
cle on an incline, as doing so may lead
to an accident. ■
When the TRAC/VSC is activated
(vehicles without Lexus Safety Sys-
tem + A)
The slip indicator light flashes. Always
drive carefully. Reckless driving may
cause an accident. Exercise particular
care when the indicator light flashes.
■
When the TRAC/ABS/VSC is acti-
vated (vehicles with Lexus Safety Sys-
tem + A)
The slip indicator light flashes. Always
drive carefully. Reckless driving may
cause an accident. Exercise particular
care when the indicator light flashes.
■
When the TRAC/VSC systems are
turned off
Be especially careful and drive at a speed
appropriate to the road conditions. As
these are the systems to help ensure
vehicle stability and driving force, do not
turn the TRAC/VSC systems off unless
necessary.