tires LEXUS LS500H 2018 Service Manual

426 7-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U)  Fluid leaks under the vehicle.
(Water dripping from the air condi-
tioning after use is normal.)
 Flat-looking tires or uneven tire
wear
 Engine coolant temperature gauge
needle continually points higher
than normal.
 Changes in exhaust sound
 Excessive tire squeal when corner-
ing
 Strange noises related to the sus-
pension system
 Pinging or other noises related to
the hybrid system
 Engine missing, stumbling or run-
ning roughly
 Appreciable loss of power
 Vehicle pulls heavily to one side
when braking  Vehicle pulls heavily to one side
when driving on a level road
 Loss of brake effectiveness, spongy
feeling, pedal almost touches the
floor
If you think something is
wrong If you notice any of the following
symptoms, your vehicle probably
needs adjustment or repair. Con-
tact your Lexus dealer as soon as
possible.
Visible symptoms
Audible symptoms
Operational symptoms

4357-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 7
When trouble arises If it is, tighten it securely.
The light will go off after several driving
trips.
If the light does not go off even after several
trips, contact your Lexus dealer as soon as
possible. ■
Electric power steering system warning
light (warning buzzer)
When the 12-volt battery charge becomes
insufficient or the voltage temporarily
drops, the electric po wer steering system
warning light may come on and the warning
buzzer may sound. ■
When the tire pressure warning light
comes on
Inspect the tires to check if a tire is punc-
tured.
If a tire is punctured: → P.442
If none of the tires are punctured:
Turn the power switch off then turn it to ON
mode. Check if the ti re pressure warning
light comes on or blinks. 
If the tire pressure wa rning light blinks for
approximately 1 minute then stays on
There may be a malfunction in the tire
pressure warning syst em. 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.401)
■
The tire pressure warning light may
come on due to natural causes
The tire pressure wa rning 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.398
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 br aking, 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 st eering 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.

436 7-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) WARNING●
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). (I f 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], yo u should determine
the proper tire infl ation pressure for
those tires.)
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.

442 7-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 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.431)
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.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 NOTICE■
When replacing the tires
When removing or fitting the wheels,
tires or the tire pr essure warning valve
and transmitter, contact your Lexus
dealer as the tire pressure 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.401)

4577-2. Steps to take in an emergency
LS500h_OM_OM50F42U_(U) 7
When trouble arises 1 Stop the hybrid system. Set the
parking brake and shift the shift
position to P.
2 Remove the mud, snow or sand
from around the rear wheels.
3 Place wood, stones or some other
material under the rear wheels to
help provide traction.
4 Restart the hybrid system.
5 Shift the shift position to D or R and
release the parking brake. Then,
while exercising caution, depress
the accelerator pedal. ■
When it is difficult to free the vehicle
Press the switch to turn off TRAC.If the vehicle becomes stuck Carry out the following proce-
dures if the tires spin or the vehicle
becomes stuck in mud, dirt or snow:
Recovering procedure WARNING■
When attempting to free a stuck vehi-
cle
If you choose to push the vehicle back
and forth to free it, make sure the sur-
rounding area is clear to avoid striking
other vehicles, obje cts or people. The
vehicle may also lunge forward or lunge
back suddenly as it becomes free. Use
extreme caution. ■
When shifting the shift position
Be careful not to shift the shift position
with the accelerator pedal depressed.
This may lead to un expected rapid accel-
eration of the vehicle that may cause an
accident resulting in death or serious
injury.
NOTICE■
To avoid damaging the transmission
and other components ●
Avoid spinning the rear wheels and
depressing the accelerator pedal
more than necessary. ●
If the vehicle remains stuck even after
these procedures are performed, the
vehicle may require towing to be freed.

466 8-1. Specifications
LS500h_OM_OM50F42U_(U) *1
: Minimum pedal clearance when depressed with a force of 11 2 lbf (500 N, 51 kgf) while
the hybrid system is operating.
When performing the brake pedal inspection, also be sure to check that the brake sys-
tem warning light is not illuminated when the hybrid system is operating. (If the brake
system warning light is illuminated, refer to P.427.) *2
: Make sure to confirm that the brake warning light (yellow) does not illuminate. (If the
brake warning light illuminates, refer to P.427.)

19-inch tires (type A) Parking brake indicator *2
When pushing the parking brake switch for 1 to 2
seconds: comes on
When pulling the parking brake switch for 1 to 2
seconds: turns off
Fluid type FMVSS No.116 DOT 3 or SAE J1703
FMVSS No.116 DOT 4 or SAE J1704
Steering Free play Less than 1.2 in. (30 mm)
Tires and wheels Tire size 245/50RF19 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 size 19 × 8J
Wheel nut torque 103 ft•lbf (140 N•m, 14.3 kgf•m)

4678-1. Specifications
LS500h_OM_OM50F42U_(U) 8
Vehicle specifications 
19-inch tires (type B)

20-inch tires (type A) Tire size 245/50RF19 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.
Wheel size 19 × 8J
Wheel nut torque 103 ft•lbf (140 N•m, 14.3 kgf•m)
Tire size 245/45RF20 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 size 20 × 8 1/2J
Wheel nut torque 103 ft•lbf (140 N•m, 14.3 kgf•m)

468 8-1. Specifications
LS500h_OM_OM50F42U_(U) 
20-inch tires (type B)

20-inch tires (type C) Tire size Front 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 size Front wheels: 20 × 8 1/2J
Rear wheels: 20 × 9 1/2J
Wheel nut torque 103 ft•lbf (140 N•m, 14.3 kgf•m)
Tire size 245/45RF20 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 size 20 × 8 1/2J
Wheel nut torque 103 ft•lbf (140 N•m, 14.3 kgf•m)

4698-1. Specifications
LS500h_OM_OM50F42U_(U) 8
Vehicle specifications 
20-inch tires (type D) Tire size Front 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 size Front wheels: 20 × 8 1/2J
Rear wheels: 20 × 9 1/2J
Wheel nut torque 103 ft•lbf (140 N•m, 14.3 kgf•m)

472 8-1. Specifications
LS500h_OM_OM50F42U_(U) Tire size ( → P.473)
Run-flat tire (RFT) or standard tire ( → P.442)This vehicle can be equipped with either run-flat tires (RFT) or standard tires. A
mark is molded on the side wall of the run-flat tire.
DOT and Tire Identification Number (TIN) ( → P.473)
Location of treadwear indicators ( → P.395)
Tire ply composition and materialsPlies are layers of rubber-coa ted parallel cords. Cords are the strands which form the plies
in a tire.
Radial tires or bias-ply tiresA radial tire has “RADIAL” on the sidewall. A tire not marked “RADIAL” is a bias-ply tire.
TUBELESS or TUBE TYPEA 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.396)
Maximum cold tire inflation pressure ( → P.466)This means the pressure to which a tire may be inflated.
Uniform tire quality gradingFor details, see “Uniform Tire Quality Grading” that follows.
Summer tires or all season tires ( → P.396)Tire information
Typical tire symbols
A
B
C
D
E
F
G
H
I
J
K