flat tire LEXUS LS500 2020 Owner's Guide

4237-2. Steps to take in an emergency
7
When trouble arises
*1: This light illuminates on the center panel.
*2: Rear passengers’ seat belt warning buzzer:
The rear passengers’ seat belt warning buzzer sounds to alert the rear passenger that his or
her seat belt is not fastened. If the seat belt is unfastened, the buzzer sounds intermittently
for a certain period of time, af ter the seat belt is fastened and unfastened and the vehicle
reaches a certain speed.
■Tire pressure warning light
■LTA indicator (warning buzzer)
■Intuitive parking assist OFF indicator (warning buzzer)
Warning lightDetails/Actions
When the light comes on after blinking for approximately 1 minute:
Malfunction in the tire pressure warning system
 Have the system checked by your Lexus dealer.
When the light comes on:
Low tire inflation pressure such as
 Natural causes
 Flat tire
 Immediately stop the vehicle in a safe place.
Handling method ( P.426)
Warning lightDetails/Actions
(orange)
Indicates a malfunction in th e LTA (Lane Tracing Assist)
 Follow the instructions displayed on the multi-information display.
(  P.238)
Warning lightDetails/Actions
(flashes)
(if equipped)
Indicates a malfunction in the in tuitive parking assist function
 Have the vehicle inspected by your Lexus dealer immediately.
Indicates that the system is temporarily unavailable, possibly due to a
sensor being dirty or covered with ice, etc.
 Follow the instructions displayed on the multi-information display.
(  P.261)

4277-2. Steps to take in an emergency
7
When trouble arises
pressure warning system. Have the vehicle
inspected by your Lexus dealer immedi-
ately.
If the tire pressure warning light comes
on
1
After the temperature of the tires has
lowered sufficiently, check the inflation
pressure of each tire and adjust them to
the specified level.
2
If the warning light does not turn off
even after several minutes have
elapsed, check that the inflation pres-
sure of each tire is at the specified level
and perform initialization. ( P.392)
■The tire pressure warning light may
come on due to natural causes
The tire pressure warning light may come
on due to natural causes such as natural air
leaks and tire inflation pressure changes
caused by temperature. In this case, adjust-
ing the tire inflation pressure will turn off the
warning light (after a few minutes).
■Conditions that the tire pressure warn-
ing system may not function properly
 P.390
WARNING
■If both the ABS and the brake system
warning lights remain on
Stop your vehicle in a safe place immedi-
ately and contact your Lexus dealer.
The vehicle will become extremely
unstable during braking, and the ABS
system may fail, which could cause an
accident resulting in death or serious
injury.
■When the electric power steering
system warning light comes on
When the light comes on yellow, the
assist to the power steering is restricted.
When the light comes on red, the assist
to the power steering is lost and handling
operations of the steering wheel become
extremely heavy.
When steering wheel operations are
heavier than usual, grip the steering
wheel firmly and operate it using more
force than usual.
■If the tire pressure warning light
comes on
Be sure to observe the following precau-
tions.
Failure to do so could cause a loss of
vehicle control and result in death or
serious injury.
●Decelerate to the lowest appropriate
speed as soon as possible. Do not
drive over 50 mph (80 km/h).
●Check and adjust the tire inflation
pressure immediately.
●If the tire pressure warning light comes
on even after tire inflation pressure
adjustment, it is prob able that you have
a flat tire. Have the flat tire replaced by
the nearest Lexus dealer.
●Avoid abrupt maneuvering and brak-
ing.
If the vehicle tires deteriorate, you
could lose control of the steering
wheel or the brakes.
■If a blowout or sudden air leakage
should occur
The tire pressure warning system may
not activate immediately.
■Maintenance of the tires
Each tire, including the spare (if pro-
vided), should be checked monthly when
cold and inflated to the inflation pressure
recommended by the vehicle manufac-
turer on the vehicle placard or tire infla-
tion pressure label (tire and load
information label). (If your vehicle has
tires of a different size than the size indi-
cated on the vehicle placard or tire infla-
tion pressure label [tire and load
information label], you should determine
the proper tire inflation pressure for
those tires.)

4287-2. Steps to take in an emergency
WARNING
As an added safety feature, your vehicle
has been equipped with a tire pressure
monitoring system (TPMS-tire pressure
warning system) that illuminates a low
tire pressure telltale (tire pressure warn-
ing light) when one or more of your tires
is significantly under-inflated. Accord-
ingly, when the low tire pressure telltale
(tire pressure warnin g light) illuminates,
you should stop and check your tires as
soon as possible, and inflate them to the
proper pressure. Driving on a signifi-
cantly under-inflated tire causes the tire
to overheat and can lead to tire failure.
Under-inflation also reduces fuel effi-
ciency and tire tread life, and may affect
the vehicle’s handling and stopping abil-
ity.
Please note that the TPMS (tire pressure
warning system) is not a substitute for
proper tire maintenance, and it is the
driver’s responsibility to maintain correct
tire pressure, even if under-inflation has
not reached the level to trigger illumina-
tion of the TPMS low tire pressure telltale
(tire pressure warning light).
Your vehicle has also been equipped with
a TPMS (tire pressure warning system)
malfunction indicator to indicate when
the system is not operating properly. The
TPMS (tire pressure warning system)
malfunction indicator is combined with
the low tire pressure telltale (tire pres-
sure warning light). When the system
detects a malfunction, the telltale will
flash for approximately one minute and
then remain continuously illuminated.
This sequence will continue upon subse-
quent vehicle start-ups as long as the
malfunction exists. When the malfunction
indicator is illuminated, the system may
not be able to detect or signal low tire
pressure as intended.TPMS (tire pressure warning system)
malfunctions may occur for a variety of
reasons, including the installation of
replacement or alternate tires or wheels
on the vehicle that prevent the TPMS
(tire pressure warning system) from func-
tioning properly. Always check the
TPMS (tire pressure warning system)
malfunction telltale after replacing one
or more tires or wheels on your vehicle to
ensure that the replacement or alternate
tires and wheels allow the TPMS (tire
pressure warning system) to continue to
function properly.
NOTICE
■To ensure the tire pressure warning
system operates properly
Do not install tires with different specifi-
cations or makers, as the tire pressure
warning system may not operate prop-
erly.

4337-2. Steps to take in an emergency
7
When trouble arises
immediately.
• “Access System with Elec. Key Malfunc- tion”
• “Shift System Malfunction”
• “P Switch Malfunction”
• “Shift System Unavailable”
●If any of the following messages are
shown on the multi-information display, it
may indicate a malfunction. Immediately
stop the vehicle and contact your Lexus
dealer.
• “Braking Power Low”
• “Charging System Malfunction”
• “Oil Pressure Low”
Take your vehicle to the nearest Lexus
dealer or authorized tire dealer as
soon as possible if any tire goes flat.
The vehicle can be driven for a maximum
of 100 miles (160 km) at a speed below 50
mph (80 km/h) after the tire pressure
warning light comes on. ( P.423)
A run-flat tire has a mark on the
side wall.
■In some conditions (such as at high tem-
peratures)
You cannot continue driving for up to 160
miles (100 km).
■For the detailed information on run-flat
tires
See the tire warranty booklet.
NOTICE
■If “High Power Consumption Partial
Limit On AC/Heater Operation” is
displayed frequently
There is a possible malfunction relating
to the charging system or the battery
may be deteriorating. Have the vehicle
inspected by your Lexus dealer.
If you have a flat tire
Your vehicle is not equipped with a
spare tire, but instead you can con-
tinue driving the vehicle with
run-flat tires even if any tire goes
flat.
In this case, slow down and drive
with extra caution.
Run-flat tires

4347-2. Steps to take in an emergency
One of the following may be the cause
of the problem:
There may not be sufficient fuel in
the vehicle’s tank.
Refuel the vehicle.
 The engine may be flooded.
Try to restart the engine again fol-
lowing correct starting procedures.
( P.165)
 There may be a malfunction in the
engine immobilizer system.
( P.63)
 There may be a malfunction in the
shift control system.
* ( P.168, 432)
*: It may not be possible to shift the shift
position from P.
One of the following may be the cause
of the problem:
 The battery may be discharged.
NOTICE
■When replacing the tires
When removing or fitting the wheels,
tires or the tire pressure warning valve
and transmitter, contact your Lexus
dealer as the tire pr essure warning valve
and transmitter may be damaged if not
handled correctly.
■When driving over bumps
If a vehicle has a flat tire, the vehicle
height will be lower than usual. Ensure
that nothing strikes the bottom of the
vehicle.
■To avoid damage to the tire pressure
warning valves and transmitters
When a tire is repaired with liquid seal-
ants, the tire pressure warning valve and
transmitter may not operate properly. If a
liquid sealant is used , contact your Lexus
dealer or other qualified service shop as
soon as possible. Make sure to replace
the tire pressure warning valve and trans-
mitter when replacing the tire. ( P.391)
If the engine will not start
If the engine will not start even
though correct starting procedures
are being followed ( P.165), con-
sider each of the following points:
The engine will not start even
though the starter motor oper-
ates normally.
The starter motor turns over
slowly, the interior lights and
headlights are dim, or the horn
does not sound or sounds at a low
volume.

4568-1. Specifications
warning light is illuminated, refer to P.419.)
*2: Make sure to confirm that the brake warning light (yellow) does not illuminate. (If the brake warning light illuminates, refer to P.419.)
*3: Vehicles without Lexus Safety System + A
*4: Vehicles with Lexus Safety System + A
19-inch tires (type A)
19-inch tires (type B)
Steering
Free playLess than 1.2 in. (30 mm)
Tires and wheels
Tire size245/50RF19 101W
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Driving under normal conditions
Front: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Rear: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Driving at high speeds above 118 mph (190 km/h) (in coun-
tries where such speeds are permitted by law)
Add 9 psi (60 kPa, 0.6 kgf/cm
2 or bar) to the front tires and
rear tires. Never exceed the maximum cold tire inflation
pressure indicated on the tire sidewall.
Wheel size19  8J
Wheel nut torque103 ft•lbf (140 N•m, 14.3 kgf•m)
Tire size245/50RF19 101V
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Driving under normal conditions
Front: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Rear: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160 km/h) (in
countries where such speeds are permitted by law)
Add 9 psi (60 kPa, 0.6 kgf/cm
2 or bar) to the front tires and
rear tires. Never exceed the maximum cold tire inflation
pressure indicated on the tire sidewall.

4578-1. Specifications
8
Vehicle specifications
20-inch tires (type A)
20-inch tires (type B)
Wheel size19  8J
Wheel nut torque103 ft•lbf (140 N•m, 14.3 kgf•m)
Tire size245/45RF20 99Y
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Driving under normal conditions
Front: 35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear: 35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Driving at high speeds above 137 mph (220 km/h) (in
countries where such speeds are permitted by law)
Add 9 psi (60 kPa, 0.6 kgf/cm
2 or bar) to the front tires and
rear tires. Never exceed the maximum cold tire inflation
pressure indicated on the tire sidewall.
Wheel size20  8 1/2J
Wheel nut torque103 ft•lbf (140 N•m, 14.3 kgf•m)
Tire sizeFront tires: 245/45RF20 99Y
Rear tires: 275/40RF20 102Y
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Driving under normal conditions
Front: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Rear: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Driving at high speeds above 137 mph (220 km/h) (in
countries where such speeds are permitted by law)
Add 9 psi (60 kPa, 0.6 kgf/cm
2 or bar) to the front tires and
rear tires. Never exceed the maximum cold tire inflation
pressure indicated on the tire sidewall.
Wheel sizeFront wheels: 20  8 1/2J
Rear wheels: 20  9 1/2J
Wheel nut torque103 ft•lbf (140 N•m, 14.3 kgf•m)

4588-1. Specifications
20-inch tires (type C)
20-inch tires (type D)
Tire size245/45RF20 99V
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Driving under normal conditions
Front: 35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Rear: 35 psi (240 kPa, 2.4 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160 km/h) (in
countries where such speeds are permitted by law)
Add 9 psi (60 kPa, 0.6 kgf/cm
2 or bar) to the front tires and
rear tires. Never exceed the maximum cold tire inflation
pressure indicated on the tire sidewall.
Wheel size20  8 1/2J
Wheel nut torque103 ft•lbf (140 N•m, 14.3 kgf•m)
Tire sizeFront tires: 245/45RF20 99V
Rear tires: 275/40RF20 102V
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Driving under normal conditions
Front: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Rear: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Driving at high speeds above 100 mph (160 km/h) (in
countries where such speeds are permitted by law)
Add 9 psi (60 kPa, 0.6 kgf/cm
2 or bar) to the front tires and
rear tires. Never exceed the maximum cold tire inflation
pressure indicated on the tire sidewall.
Wheel sizeFront wheels: 20  8 1/2J
Rear wheels: 20  9 1/2J
Wheel nut torque103 ft•lbf (140 N•m, 14.3 kgf•m)

4618-1. Specifications
8
Vehicle specifications
Tire size (P.462)
Run-flat tire (RFT) or standard tire ( P.433)
This vehicle can be equipped with either run-flat tires (RFT) or standard tires. A
mark is molded on the sidewall of the run-flat tire.
DOT and Tire Identification Number (TIN) ( P.462)
Location of treadwear indicators ( P.387)
Tire ply composition and materials
Plies are layers of rubber-coated parallel cords. Cords are the strands which form the plies
in a tire.
Radial tires or bias-ply tires
A radial tire has “RADIAL” on the sidewall. A tire not marked “RADIAL” is a bias-ply tire.
TUBELESS or TUBE TYPE
A tubeless tire does not have a tube and air is directly put into the tire. A tube type tire has a
tube inside the tire and the tube maintains the air pressure.
Load limit at maximum cold tire inflation pressure ( P.387)
Maximum cold tire inflation pressure ( P.456)
This means the pressure to which a tire may be inflated.
Uniform tire quality grading
For details, see “Uniform Tire Quality Grading” that follows.
Summer tires or all season tires ( P.387)
Tire information
Typical tire symbols
A
B
C
D
E
F
G
H
I
J
K

4628-1. Specifications
An all season tire has “M+S” on the sidewall. A tire not marked “M+S” is a summer tire.
Type A
DOT symbol
*
Tire Identification Number (TIN)
Tire manufacturer’s identification
mark
Tire size code
Manufacturer’s optional tire type
code (3 or 4 letters)
Manufacturing week
Manufacturing year
*:The DOT symbol cert ifies that the tire
conforms to applicable Federal Motor
Vehicle Safety Standards.
Type B
DOT symbol
*
Tire Identification Number (TIN)
Tire manufacturer’s identification
mark
Manufacturer’s code
Manufacturing week
Manufacturing year
*: The DOT symbol certifies that the tire conforms to applicable Federal Motor
Vehicle Safety Standards.
■Typical tire size information
The illustration indicates typical tire
size.
Tire use (P = Passenger car, T =
Temporary use)
Section width (millimeters)
Aspect ratio (tire height to section
width)
Tire construction code (R = Radial,
D = Diagonal)
Run-flat tire code
Wheel diameter (inches)
Load index (2 digits or 3 digits)
Speed symbol (alphabet with one
Typical DOT and Tire Identifica-
tion Number (TIN)
A
B
C
D
E
F
G
A
Tire size
B
C
D
E
F
A
B
C
D
E
F
G
H