tire pressure LEXUS LS500 2018 Owner's Manual

3896-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) 6
Maintenance and care before serious problems arise.
 The tire pressure detected by the
tire pressure warning system can be
displayed on the multi-information
display. ( → P.76)
 If the tire pressure drops below a
predetermined level, the driver is
warned by a screen display and a
warning light. ( → P.422)
■
Routine tire inflation pressure checks
The tire pressure warning system does not
replace routine tire inflation pressure
checks. Make sure to check tire inflation
pressure as part of your routine of daily
vehicle checks.
■
Tire inflation pressure
●
It may take a few minutes to display the
tire inflation pressure after the engine
switch is turned to IGNITION ON mode.
It may also take a few minutes to display
the tire inflation pres sure after inflation
pressure has been adjusted.
●
Tire inflation pressu re changes with tem-
perature. The displayed values may also be different from the values measured
using a tire pressure gauge. ■
Situations in which the tire pressure
warning system may not operate prop-
erly ●
In the following cases, the tire pressure
warning system may not operate prop-
erly.
• If non-genuine Lexus wheels are used.
• If a tire has been replaced with a tire that
is not an OE (Original Equipment) tire.
• If a tire has been replaced with a tire that
is not of the specified size.
• If tire chains, etc. are installed.
• An auxiliary-supported run-flat tire is
equipped.
• If a window tint that affects the radio wave
signals is installed.
• If there is a lot of snow or ice on the vehi-
cle, particularly around the wheels or
wheel housings.
• If the tire inflation pressure is much higher
than the specified level.
• If wheels not equipped with tire pressure
warning valves and transmitter are used.
• If the ID code on the tire pressure warn-
ing valves and transmitters is not regis-
tered in the tire pressure warning
computer. ●
Performance may be af fected in the fol-
lowing situations.
• When driving near a TV tower, electric
power plant, gas stat ion, radio station,
large display, airport or other facility that
generates strong radi o waves or electri-
cal noise
• When carrying a portable radio, cellular
phone, cordless phone or other wireless
communication device
If tire position information is not correctly
displayed due to the radio wave conditions,
the display may be corrected by changing
the location of the vehicle as the radio wave
conditions may change.
●
When the vehicle is stopped, the time
taken for the warning to start or turn off
may be longer.
●
When the inflation pressure of a tire
drops rapidly, for example when a tire has
burst, the warning may not operate.

390 6-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) ■
Warning performance of the tire pres-
sure warning system
The warning of the tire pressure warning
system will change in accordance with driv-
ing conditions. For this reason, the system may give a warning even if the tire pressure
does not reach a low enough level, or if the
pressure is higher than the pressure that
was adjusted to when the system was initial-
ized.■
Tire pressure warning system certification 
For vehicles sold in the U.S.A. , Hawaii, Guam and Puerto Rico

392 6-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) When replacing the tires or wheels, the
tire pressure warning valve and trans-
mitters must be installed to the wheels
which will be installed to the vehicle.
When new tire pressure warning
valves and transmitte rs are installed,
new ID codes must be registered in the
tire pressure warning computer and
the tire pressure warning system must
be initialized. ( → P.394)■
Replacing tires and wheels
If the ID codes of the tire pressure warning
valve and transmitters are not registered,
the tire pressure warning system will not
work properly. In this case, after driving for
about 20 minutes, the tire pressure warning
light will blink for ap proximately 1 minute
and then illuminate to indicate a system
malfunction. ■
The tire pressure warning system
must be initialized in the following
circumstances:
 When the tire inflation pressure is
changed such as when changing
traveling speed or load weight.
 When the tire inflation pressure is
changed such as when the tire size
is changed.
 When rotating the tires.
 After performing the transmitter ID
code registration procedure.
( → P.394)
When the tire pressure warning system
is initialized, the current tire inflation
pressure is set as the benchmark pres-
sure. ■
How to initialize the tire pressure
warning system
1 Park the vehicle in a safe place and
turn the engine switch off. The initialization pr ocedure cannot be
started while the vehicle is moving.
2 Adjust the tire inflation pressure to
the specified cold tire inflation pres-
sure level. Make sure to adjust the tire pressure to the
specified cold tire infl ation pressure level.
The tire pressure warning system will oper-
ate based on this pressure level.
3 Turn the engine switch to IGNI-
TION ON mode.
4 Press or of the meter con-
trol switch to select .Installing tire pressure warning
valves and transmitters
NOTICE■
Repairing or replacing tires, wheels,
tire pressure warning valves, trans-
mitters and tire valve caps●
When removing or fitting the wheels,
tires or the tire pressure warning
valves and transmitters, contact your
Lexus dealer as the tire pressure warn-
ing valves and transmitters may be
damaged if not handled correctly.
●
Make sure to install the tire valve caps.
If the tire valve caps are not installed,
water may enter the valves of the tire
pressure warning valve and transmit-
ters and the valves may become stuck.
●
When replacing tire valve caps, do not
use tire valve caps other than those
specified. The cap may become stuck. Initializing the tire pressure
warning system

3936-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) 6
Maintenance and care 5 Press or to select “Vehicle
Settings” and then press .
6 Press or to select “TPWS”
and then press .
7 Press or to select “Set
Pressure”. Then press and hold
until the tire pressure warning light
blinks 3 times.Then a message will be displayed on the
multi-information display.
“--” will be displayed on the multiinforma-
tion display for the inflation pressure of
each tire while initia lization is being per-
formed.
8 Drive straight (with occasional left
and right turns) at approximately
25 mph (40 km/h) or more for
approximately 10 to 30 minutes.Initialization is complete when the position
of each tire is determined and the inflation
pressure of each tire is displayed on the
multi-information display.
Initialization may take longer than approxi-
mately 1 hour in certain situations, such as
when the vehicle is stopped for a long time
at traffic lights, etc. ( → P.393)
■
Initialization procedure
●
Make sure to perform the initialization
procedure after adjusting the tire inflation
pressure.
Also, make sure the tires are cold before performing the initia lization procedure or
adjusting the tire inflation pressure. ●
If the engine switch is turned off during
initialization, it is no t necessary to restart
the initialization procedure from the
beginning as it will begin automatically
when the engine switch is turned back to
IGNITION ON mode. ●
If initialization has accidentally been
started when it is not necessary, adjust
the tire inflation pressure to the specified
level when the tires are cold and then
perform the initiali zation procedure
again. ●
While the position of each tire is being
determined and the inflation pressures
are not being displayed on the
multi-information display, if the inflation
pressure of a tire drops, the tire pressure
warning light will come on. ■
If the tire pressure warning system is not
initialized properly ●
In the following situations, initialization
may take longer than usual to be com-
pleted or may not be possible. (Usually,
the vehicle will need to be driven for
approximately 10 to 30 minutes to com-
plete initialization.) If initialization is not
complete after drivin g approximately 30
minutes, continue driving for a while.
• If the vehicle is driven on an unpaved
road, it may take longer to complete ini-
tialization.
• If the vehicle is backed up while perform-
ing initialization, data collected during ini-
tialization will be cleared and it will take
longer than normal to complete.
• If the vehicle is driven in heavy traffic or
another situation where other vehicles
are driven close by, it may take time for
the system to recognize the tire pressure
warning valve and transmitters of your
vehicle over those of other vehicles.
If initialization is not complete after driving
for approximately 1 hour, park the vehicle in
a safe place for approximately 20 minutes
and then drive the vehicle again.
●
In the following situations, initialization
will not be started or was not completed
properly and the system will not operate
properly. Perform the initialization proce-

394 6-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) dure again.
• If, when attempting to start initialization,
the tire pressure warning light does not
blink 3 times.
• If, when the vehicle has been driven for
about 20 minutes after performing ini-
tialization, the tire pressure warning light
blinks for approximately 1 minute and
then illuminates.●
If initialization cannot be completed after
performing the above procedure, con-
tact your Lexus dealer.
Every tire pressure warning valve and
transmitter has a unique ID code.
When replacing a tire pressure warn-
ing valve and transmitter, it is necessary
to register the ID codes.
The ID codes can be registered on
of the multi-information display.
1 Press or of the meter con-
trol switch to select .
2 Press or to select “Vehicle
Settings” and then press .
3 Press or to select “TPWS”
and then press . 4 Press or to select “Change
Wheel Set”. Then press and hold
until the tire pressure warning
light blinks slowly 3 times. Then a message will be displayed on the
multi-information display.
When registration is being performed, the
tire pressure warning light will blink for
approximately 1 minute then illuminate and
“--” will be displayed for the inflation pres-
sure of each tire on the multi-information
display.
5 Drive straight (with occasional left
and right turns) at approximately
25 mph (40 km/h) or more for
approximately 10 to 30 minutes. Registration is complete when the tire
pressure warning light turns off and the
inflation pressure of ea ch tire is displayed
on the multiinformation display.
Registration may take longer than approxi-
mately 1 hour in certain situations, such as
when the vehicle is stopped for a long time
at traffic lights, etc. ( → P.395)
After registering the ID codes, make sure
to initialize the tire pressure warning sys-
tem. ( → P.392)
■
When registering ID codes
●
Before performing ID code registration,
make sure that no wheels with tire pres-
sure warning valve and transmitters
installed are near the vehicle.
●
Make sure to initializ e the tire pressure
warning system after registering the ID WARNING■
When initializing the tire pressure
warning system
Do not initialize the tire pressure warning
system without first adjusting the tire
inflation pressure to the specified level.
Otherwise, the tire pressure warning
light may not come on even if the tire
inflation pressure is low, or it may come
on when the tire inflation pressure is
actually normal.
Registering ID codes

3956-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) 6
Maintenance and care codes. If the system is initialized before
registering the ID co des, the initialized
values will be invalid.●
As the tires will be warm when registra-
tion is completed, ma ke sure to allow the
tires to cool before performing initializa-
tion.■
Canceling ID code registration●
To cancel ID code registration after it has
been started, turn th e engine switch off
before driving the vehicle.
If the vehicle is driven after ID code regis-
tration is started, to cancel registration,
perform the ID code registration start
procedure again and turn the engine
switch off before driving.●
If ID code registration has been canceled,
the tire pressure warning light will blink
for approximately 1 minute when the
engine switch is turned to IGNITION
ON mode and then illuminate. The tire
pressure warning system will be opera-
tional when the tire pressure warning
light turns off.●
If the warning light does not turn off even
after several minutes have elapsed, ID
code registration may not have been can-
celled correctly. To ca ncel registration,
perform the ID code registration start
procedure again and th en turn the engine
switch off before driving.■
If ID codes are not registered properly●
In the following situat ions, ID code regis-
tration may take longer than usual to be
completed or may not be possible. (Usu-
ally, the vehicle will need to be driven for
approximately 10 to 30 minutes to com-
plete ID code registration.)
If ID code registration is not complete
after driving for approximately 30 min-
utes, continue driving for a while.
• If the vehicle is driven on an unpaved
road, it may take longer than normal to
complete registration.
• If the vehicle is backed up while perform-
ing registration, data collected during
registration will be cleared, and it will take
longer than normal to complete.
• If the vehicle is driven in heavy traffic or
another situation where other vehicles
are driven close by, it may take time for the system to recognize the tire pressure
warning valve and transmitters of your
vehicle over those of other vehicles.
•If a wheel with a ti re pressure warning
valve and transmitter in stalled is inside or
near the vehicle, registration of the ID
codes for the installed wheels may not be
possible.
If ID registration is not complete after driv-
ing for approximately 1 hour, park the vehi-
cle in a safe place for approximately 20
minutes and then perform the ID code reg-
istration procedure again. ●
In the following situations, ID code regis-
tration will not be started or was not com-
pleted properly and the system will not
operate properly. Pe rform the ID code
registration procedure again.
• If, when attempting to start ID code regis-
tration, the tire pressure warning light
does not blink slowly 3 times.
• If, when the vehicle has been driven for
about 20 minutes after performing ID
code registration, the tire pressure warn-
ing light blinks for approximately 1 minute
and then illuminates. ●
If ID code registration cannot be com-
pleted after performing the above proce-
dure, contact your Lexus dealer.

3996-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) 6
Maintenance and care The recommended cold tire inflation
pressure and tire size are displayed on
the tire and loading information label.
( → P.454)
Tire valve
Tire pressure gaugeWARNING■
When installing the tire
Failure to follow these precautions could
cause the wheel nuts to loosen and the
tire to fall off, resulting in death or serious
injury. ●
Never use oil or grease on the wheel
bolts or wheel nuts.
Oil and grease may cause the wheel
nuts to be excessively tightened, lead-
ing to bolt or disc wheel damage. In
addition, the oil or grease can cause
the wheel nuts to loosen and the wheel
may fall off, causing a serious accident.
Remove any oil or grease from the
wheel bolts or wheel nuts.●
Have the wheel nuts tightened with a
torque wrench to 103 ft•lbf (140 N•m,
14.3 kgf•m) as soon as possible after
changing wheels.●
Do not attach a heavily damaged
wheel ornament, as it may fly off the
wheel while the vehicle is moving.●
When installing a tire, only use wheel
nuts that have been specifically
designed for that wheel.●
If there are any cracks or deformations
in the bolt screws, nut threads or bolt
holes of the wheel, have the vehicle
inspected by your Lexus dealer.
NOTICE
■
Repairing or replacing tires, wheels,
tire pressure warning valves, trans-
mitters and tire valve caps
→ P.392 Tire inflation pressure
Checking the specified tire infla-
tion pressure
Inspection and adjustment pro-
cedure
A
B

400 6-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) 1 Remove the tire valve cap.
2 Press the tip of the tire pressure
gauge onto the tire valve.
3 Read the pressure using the gauge
gradations.
4 If the tire inflation pressure is not at
the recommended level, adjust the
pressure.
If you add too much air, press the
center of the valve to deflate.
5 After completing the tire inflation
pressure measurem ent and adjust-
ment, apply soapy water to the
valve and check for leakage.
6 Put the tire valve cap back on. ■
Tire inflation pressure check interval
You should check tire inflation pressure
every two weeks, or at least once a month.
Do not forget to check the spare. ■
Effects of incorrect tire inflation pres-
sure
Driving with incorrect ti re inflation pressure
may result in the following: ●
Reduced fuel economy●
Reduced driving comfort and poor han-
dling●
Reduced tire life due to wear●
Reduced safety●
Damage to the drive train
If a tire needs frequent inflating, have it
checked by your Lexus dealer.
■
Instructions for checking tire inflation
pressure
When checking tire inflation pressure,
observe the following:
●
Check only when the tires are cold.
If your vehicle has been parked for at
least 3 hours or has not been driven for
more than 1 mile or 1.5 km, you will get an
accurate cold tire in flation pressure read- ing. ●
Always use a tire pressure gauge.
It is difficult to judge if a tire is properly
inflated based only on its appearance. ●
It is normal for the ti re inflation pressure
to be higher after driving as heat is gen-
erated in the tire. Do not reduce tire infla-
tion pressure after driving. ●
Never exceed the vehicle capacity
weight.
Passengers and luggage weight should
be placed so that the vehicle is balanced.
WARNING■
Proper inflation is critical to save tire
performance
Keep your tires properly inflated.
If the tires are not properly inflated, the
following conditions may occur which
could lead to an accident resulting in
death or serious injury: ●
Excessive wear ●
Uneven wear ●
Poor handling ●
Possibility of blowouts resulting from
overheated tires
●
Air leaking from between tire and
wheel
●
Wheel deformation and/or tire dam-
age
●
Greater possibility of tire damage
while driving (due to road hazards,
expansion joints, sharp edges on the
road, etc.)
NOTICE
■
When inspecting and adjusting tire
inflation pressure
Be sure to put the tire valve caps back on.
If a valve cap is not installed, dirt or mois-
ture may get into the valve and cause an
air leak, resulting in decreased tire infla-
tion pressure.

4016-3. Do-it-yourself maintenance
LS500_OM_OM50F54U_(U) 6
Maintenance and care When replacing wheels, care should
be taken to ensure that they are equiv-
alent to those removed in load capac-
ity, diameter, rim width and inset *
.
Replacement wheels are available at
your Lexus dealer. *
: Conventionally referred to as offset.
Lexus does not recommend using the
following:
 Wheels of different sizes or types
 Used wheels
 Bent wheels that have been straight-
ened ■
When replacing wheels
The wheels of your vehicle are equipped
with tire pressure warning valves and trans-
mitters that allow the tire pressure warning
system to provide advance warning in the
event of a loss in tire inflation pressure.
Whenever wheels are replaced, the tire
pressure warning valv es and transmitters
must be installed. ( → P.392)  Use only Lexus wheel nuts and
wheel nut wrenches designed for
use with your aluminum wheels.
 When rotating, repairing or chang-
ing your tires, check that the wheel
nuts are still tight after driving 1000
miles (1600 km).
 Be careful not to damage the alumi-
num wheels when using tire chains.
 Use only Lexus genuine balance
weights or equivalent and a plastic
or rubber hammer when balancing
your wheels.Wheels If a wheel is bent, cracked or heavily
corroded, it should be replaced.
Otherwise, the tire may separate
from the wheel or cause a loss of
handling control.
Wheel selection
WARNING
■
When replacing wheels
●
Do not use wheels that are a different
size from those recommended in the
Owner’s Manual, as this may result in a
loss of handling control. ●
Never use an inner tube in a leaking
wheel which is designed for a tubeless
tire.
Doing so may result in an accident,
causing death or serious injury. ■
Use of defective wheels prohibited
Do not use cracked or deformed wheels.
Doing so could cause the tire to leak air
during driving, possibly causing an acci-
dent.
NOTICE■
Replacing tire pressure warning
valves and transmitters ●
Because tire repair or replacement
may affect the tire pressure warning
valves and transmitters, make sure to
have tires serviced by your Lexus
dealer or other qua lified service shop.
In addition, make sure to purchase
your tire pressure warning valves and
transmitters at your Lexus dealer. ●
Ensure that only genuine Lexus wheels
are used on your vehicle.
Tire pressure warning valves and trans-
mitters may not work properly with
non-genuine wheels.
Aluminum wheel precautions

422 7-2. Steps to take in an emergency
LS500_OM_OM50F54U_(U) ■
Rear passengers’ seat belt reminder lights *1
(warning buzzer) *2
*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 passengers that his
or her seat belt is not fastened. The buzzer sounds once if the vehicle reaches a speed of 12
mph (20 km/h). If the seat belt is still unfastened after 24 seconds, the buzzer will sound
intermittently for 6 seconds. Th en, if the seat belt is still un fastened, the buzzer will sound in
a different tone for 30 more seconds. ■
Tire pressure warning light
■
LTA indicator/LKA indicator (warning buzzer) Warning light Details/Actions
Warns the rear passengers to fasten their seat belts
→ Fasten the seat belt.
Warning light Details/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 light Details/Actions
(orange) Indicates a malfunction in the LTA (Lane Tracing Assist) or LKA
(Lane-Keeping Assist)
→ Follow the instructions displayed on the multi-information display.
( → P.229, 237)