2020 Lexus GX460 warning

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GX460_OM_OM60R27U_(U)6-3. Do-it-yourself maintenance
Tires
Check if the treadwear indicators are showing on the tires. Also check the tires
for uneven wear, such as excessive
wear on one side of the tread.
Check the spare tire condition and pressure if not rotated.
New tread
Worn tread
Treadwear indicator
The location of treadwear indicators is shown by a “TWI” or “ ” mark, etc., molded
into the sidewall of each tire.
Replace the tires if the treadwear indicators are showing on a tire.
Rotate the tires in the order shown.
To equalize tire wear and extend tire life,
Lexus recommends that tire rotation is
carried out at the same interval as tire
inspection.
Do not fail to initialize the tire pressure
warning system after tire rotation.
Replace or rotate tires in accordance with maintenance schedules and tread-
wear.
Checking tires
Tire rotation
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6
Maintenance and care
Your vehicle is equipped with a tire pressure warning system that uses tire pres-
sure warning valves and transmitters to detect low tire inflation pressure before
serious problems arise.
●If the tire pressure drops below a predet ermined level, the driver is warned by
a screen display and a warning light. ( P. 513)
●The tire pressure detected by the
tire pressure warning system can be
displayed on the multi-information
display. ( P. 91)
The illustration used is intended as an
example, and may differ from the image
that is actually disp layed on the multi-
information display.
◆Installing tire pressure warning valves and transmitters
When replacing tires or wheels, tire pr essure warning valves and transmitters
must also be installed.
When new tire pressure wa rning valves and transmitters are installed, new ID
codes must be registered in the tire pressure warning computer and the tire
pressure warning system must be initialized. ( P. 467)
◆Initializing the tire pressure warning system
■The tire pressure warning system must be initialized in the following circum-
stances:
●When changing the tire size.
●When rotating the tires.
●When the tire inflation pressure is changed such as when changing travel-
ing speed or load weight.
●After registering the ID codes. ( P. 467)
When the tire pressure warning system is initialized, the current tire inflation
pressure is set as the benchmark pressure.
Tire pressure warning system

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GX460_OM_OM60R27U_(U)6-3. Do-it-yourself maintenance
■How to initialize the tire pressure warning system
Park the vehicle in a safe place and st op the engine for 20 minutes or more.
Initialization cannot be performed while the vehicle is moving.
Adjust the tire inflation pressure to th e specified cold tire inflation pressure
level. ( P. 560)
Make sure to adjust the tire pressure to the specified cold tire inflation pressure
level. The tire pressure warning system will operate based on this pressure level.
Start the engine. (P. 196)
Press or of the meter control switches and select .
Press or of the meter control switches and select “Vehicle
Settings”, and then press .
Press or of the meter control switches and select “TPWS”, and
then press .
Press or of the meter
control switches and select “Set
Pressure”, and then press and
hold until the tire pressure
warning light starts blinking.
A message is displayed on the multi-
information display. Also, “--” is dis-
played for inflation pressure of each
tire on the multi-information display
while the tire pressure warning sys-
tem determines the position.
Drive at approximately 25 mph (40 km /h) or more for approximately 10 to
30 minutes.
When initialization is comple te, the inflation pressure of each tire will be displayed
on the multi-information display.
Even if the vehicle is not driven at ap proximately 25 mph (40 km/h) or more, ini-
tialization can be co mpleted by driving for a long ti me. However, if initialization
does not complete after driving for 1 hour or more, park the vehicle in a safe place
for approximately 20 minutes and then drive the vehicle again.
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Maintenance and care
◆Registering ID codes
Every tire pressure warning valve and transmitter has a unique ID code.
When replacing a tire pressure warning valve and transmitter, it is necessary
to register the ID code.
When registering the ID codes, perform the following procedure.
Park the vehicle in a safe place, wait for approximately 20 minutes, and
then start the engine. ( P. 196)
Press or of the meter control switches and select .
Press or of the meter control switches and select “Vehicle
Settings”, and then press .
Press or of the meter control switches and select “TPWS”, and
then press .
Press or of the meter
control switches and select
“Change Wheel Set”, and then
press and hold until the tire
pressure warning light starts
slowly blinking 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
pressure of each tire on the multi-information display.
Drive 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 each tire is displayed on the multi-information display.
Even if the vehicle is not driven at approxim ately 25 mph (40 km/h) or more, reg-
istration can be completed by driving for a long time. However, if registration does
not complete after driving for 1 hour or more, perform the procedure again from
the beginning.
Initialize the tire pressure warning system. ( P. 466)
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GX460_OM_OM60R27U_(U)6-3. Do-it-yourself maintenance
■When to replace your vehicle’s tires
Tires should be replaced if:
●The treadwear indicators are showing on a tire.
●You have tire damage such as
cuts, splits, cracks deep enough to expose the fabric, and
bulges indicating internal damage
●A tire goes flat repeatedly or cannot be properly repaired due to the size or location of
a cut or other damage
If you are not sure, consult with your Lexus dealer.
■Replacing tires and wheels
If the ID code of the tire pressure warning valve and transmitter is not registered, the tire
pressure warning system will not work proper ly. After driving for about 20 minutes, the
tire pressure warning light blinks for 1 minu te and stays on to indicate a system malfunc-
tion.
■Tire life
Any tire over 6 years old must be checked by a qualified technician even if it has seldom
or never been used or damage is not obvious.
■Routine tire inflation pressure checks
The tire pressure warning syst em does not replace routine tire inflation pressure checks.
Make sure to check tire inflat ion pressure as part of your routine of daily vehicle checks.
■Maximum load of tire
Check that the number given by dividing the maximum load by 1.10 of the replacement
tire is greater than 1/2 of the Gross Axle We ight Ratings (GAWR) of either the front axle
or the rear axle, whichever is greater.
For the GAWR, see the Certification Label. For
the maximum load of the tire, see the load limit
at maximum cold tire inflation pressure men-
tioned on the sidewall of the tire. ( P. 565)

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GX460_OM_OM60R27U_(U)6-3. Do-it-yourself maintenance
■If the tread on snow tires wears down below 0.16 in. (4 mm)
The effectiveness of the tire
s as snow tires is lost.
■Situations in which the tire pressure warning system may not operate properly
●In the following cases, the tire pressure warning system may not operate properly.
• If non-genuine Lexus wheels are used.
• A tire has been replaced with a tire that is not an OE (Original Equipment) tire.
• A tire has been replaced with a tire that is not of the specified size.
• Tire chains etc. are equipped.
• An auxiliary-supported run-flat tire is equipped.
• If a window tint that affects th e 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 extr emely higher than the specified level.
• If the spare tire is in a location subj ect to poor radio wave signal reception.
• If a large metallic object which can interfere with signal reception is put near the
spare tire.
• If tires not equipped with the tire pressure warning valves and transmitters are used.
• If the ID code on the tire pressure warning valves and transmitters is not registered
in the tire pressure warning computer.
●Performance may be affected in the following situations.
• Near a TV tower, electric power plant, gas station, radio station, large display, air-
port or other facility that generates st rong radio waves or electrical noise
• When carrying a portable radio, cellular phone, cordless phone or other wireless
communication device
If tire position information is not correctl y displayed due to the radio wave conditions,
the display may be corrected by driving and changing the radio wave conditions.
●When the vehicle is parked, the time taken for the warning to start or go off could be
extended.
●When tire inflation pressure declines rapidly for example when a tire has burst, the
warning may not function.

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6
Maintenance and care
■The initialization operation
●Make sure to carry out initialization after adjusting the tire inflation pressure.
Also, make sure the tires are cold before carryi ng out initialization or tire inflation pres-
sure adjustment.
●If you have accidentally turned the engine swit ch off during initialization, it is not neces-
sary to manually restart the in itialization again, as initialization will restart automatically
the next time the engine switch is turned to IGNITION ON mode.
●If you accidentally perform initialization when initialization is not necessary, adjust the
tire inflation pressure to the specified leve l when the tires are cold, and conduct initial-
ization again.
●While the position of each tire is being de termined and the inflation pressures are not
being displayed on the multi-info rmation display, if the inflation pressure of a tire drops,
the tire pressure warning light will come on.
■Warning performance of the tire pressure warning system
The warning of the tire pressu re warning system will change in accordance with the con-
ditions under which it was init ialized. 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 initialized.
■When initialization of the tire pressure warning system has failed
●Do not move the vehicle backward during in itialization. Initialization is started again
from the beginning and it ma y take longer than usual.
●Initialization may take longer to complete if the vehicle is driven on an unpaved road.
When performing initialization, drive on a paved road if possible. Depending on the
driving environment and cond ition of the tires, initialization will be completed in
approximately 10 to 30 minutes.
• If initialization is not comp lete after driving approximately 30 minutes, continue
driving for a while.
• If initialization is not complete after driv ing approximately 1 hour, park the vehicle in
a safe place for approximately 20 minutes. Then drive straight (with occasional left
and right turns) at approximat ely 25 mph (40 km/h) or more
* for approximately 10
to 30 minutes.
If initialization is still not complete, have the vehicle inspected by your Lexus dealer.
*: Except when making a left/right turn
●In the following situations, th e tire inflation pressure will not be recorded and the system
will not operate properly. Perform initialization 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 ab out 20 minutes after performing initializa-
tion, the tire pressure warning light blinks for approximately 1 minute and then illumi-
nates.

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GX460_OM_OM60R27U_(U)6-3. Do-it-yourself maintenance
■When registering ID codes
●ID code registration is performed while driving at a vehicle speed of approximately 25
mph (40 km/h) or more.
●Before performing ID code registration, make
sure that no wheels with tire pressure
warning valve and transmitters installed are near the vehicle.
●Initialize the tire pressure warning system after ID code registration. Initialization is dis-
abled if the system was init ialized before registration.
●After ID code registration, the tires are hot by driving. Initialize the tire pressure warn-
ing system after the tires become cold.
●ID codes can be registered by yourself, bu t depending on the driving conditions and
driving environment, registration may take some time to complete.
■Canceling the change wheel set mode
●If turning the engine switch off when in th e change wheel set mode before driving, the
change wheel set mode is canceled.
●After driving when in the ch ange wheel set mode, the change wheel set mode cannot
be canceled. To cancel the mode, perform th e procedure for ID code registration again
and turn the engine switch off before driving.
●If the change wheel set mode is canceled, the ID codes that have already been regis-
tered are communicated. When communication is finished, the tire pressure warning
light will turn off.
■When ID code registration has failed
●Registration may take long time or the ID codes may not be registered in the following
situations.
• When the vehicle is moved ba ckward during registration.
Registration is started again from the beginning and it may take longer than usual.
• When another vehicle is running the side of the vehicle such as in heavy traffic. It may take longer to detect the vehicle’s tire pressure warning valves and transmit-
ters.
• If tire pressure warning valves an d transmitters are in the vehicle.
The ID codes may not be registered.
●When performing registration , drive on a paved road if possible. Depending on the
driving environment and conditio n of the tires, registration will be completed in approx-
imately 10 to 30 minutes.
• If registration is not comple te after driving approximately 30 minutes, continue driv-
ing for a while.
• If registration is not complete after driving approximately 1 hour, park the vehicle in a safe place for approximately 20 minutes. Then drive straight (with occasional left
and right turns) at approximat ely 25 mph (40 km/h) or more
* for approximately 10
to 30 minutes.
If registration is still not complete, have the vehicle inspected by your Lexus dealer.
*: Except when making a left/right turn
●When the tire pressure warning light does not blink slowly 3 times, the ID code will not
be registered and the system will not operate properly. Perform registration again.