warning TOYOTA MIRAI 2023 Owners Manual

4297-3. Do-it-yourself maintenance
Owners Manual_USA_M62064_en
7
Maintenance and care
Tire pressure gauge
1 Remove the tire valve cap.
2 Press the tip of the tire pres-
sure 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 infla-
tion pressure measurement
and adjustment, 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 pres-
sure every two weeks, or at least
once a month. Do not forget to
check the spare.
■Effects of incorrect tire inflation
pressure
Driving with incorrect tire inflation
pressure may result in the following:
●Reduced fuel economy
●Reduced driving comfort and poor
handling
●Reduced tire life due to wear
●Reduced safety
●Damage to the drive train
If a tire needs frequent inflating,
have it checked by your Toyota
dealer.
■Instructions for checking tire
inflation pressure
When checking tire inflation pres-
sure, 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 inflation pressure reading.
●Always use a tire pressure gauge.
It is difficult to j udge if a tire is
properly inflated based only on its
appearance.
●It is normal for the tire inflation
pressure to be higher after driving
as heat is generated in the tire. Do
not reduce tire inflation pressure
after driving.
●Never exceed the vehicle capacity
weight.
Passengers and luggage weight
should be placed so that the vehi-
cle 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 seri-
ous 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
damage

4307-3. Do-it-yourself maintenance
Owners Manual_USA_M62064_en
When replacing wheels, care
should be taken to ensure that
they are equivalent to those
removed in load capacity, diam-
eter, rim width and inset
*.
Replacement wheels are avail-
able at your Toyota dealer.
*: Conventionally referred to as off- set.
Toyota does not recommend
using the following:
 Wheels of different sizes or
types
 Used wheels
 Bent wheels that have been
straightened
■When replacing wheels
The wheels of your vehicle are
equipped with tire pressure warning
valves and transmitters that allow
the tire pressure warning system to
provide advance warning in the
event of a loss in tire inflation pres-
sure. Whenever wheels are
replaced, the tire pressure warning
valves and transmitters must be
installed. ( P.419)
WARNING
●Greater possibility of tire dam-
age while driving (due to road
hazards, expansion joints,
sharp edges in the road, etc.)
NOTICE
■When inspecting and adjust-
ing tire inflation pressure
Be sure to put the tire valve caps
back on.
If a valve cap is not installed, dirt
or moisture may get into the valve
and cause an air leak, resulting in
decreased tire inflation pressure.
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

4317-3. Do-it-yourself maintenance
Owners Manual_USA_M62064_en
7
Maintenance and care
 Use only Toyota wheel nuts
and wheel nut wrenches
designed for use with your
aluminum wheels.
 When rotating, repairing or
changing your tires, check
that the wheel nuts are still
tight after driving 1000 miles
(1600 km).
 Be careful not to damage the
aluminum wheels when using
tire chains.
 Use only Toyota genuine bal-
ance weights or equivalent
and a plastic or rubber ham-
mer when balancing your
wheels.
WARNING
■When replacing wheels
●Do not use wheels that are a dif-
ferent size from those recom-
mended 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 acci-
dent, causing death or serious
injury.
■When installing the wheel
nuts
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, caus-
ing an accident and resulting in
death or serious injury. Remove
any oil or grease from the wheel
bolts or wheel nuts.
■Use of defective wheels pro-
hibited
Do not use cracked or deformed
wheels. Doing so could cause the
tire to leak air during driving, pos-
sibly causing an accident.
NOTICE
■Replacing tire pressure warn-
ing valves and transmitters
●Because tire repair or replace-
ment may affect the tire pres-
sure warning valves and
transmitters, make sure to have
tires serviced by your Toyota
dealer or other qualified service
shop. In addition, make sure to
purchase your tire pressure
warning valves and transmit-
ters at your Toyota dealer.
●Ensure that only genuine Toyota
wheels are used on your vehi-
cle.
Tire pressure warning valves
and transmitters may not work
properly with non-genuine
wheels.
Aluminum wheel precau-
tions

4347-3. Do-it-yourself maintenance
Owners Manual_USA_M62064_en
1Turn the power switch off.
2 Remove the grille.
3 Remove the filter from the air
intake vent grille.
If dust has accumu lated on the air
intake vent grille, remove t he dust
with a vacuum cleaner, etc.
4 Remove the dust and sand
from the filter.
Using a vacuum cleaner, etc.,
absorb dust and sand from the filter
by profiling the nozzle lightly along
the fold.
5Hold the filter to the light and
check if it is not clogged.
If the dust or sand cannot be
removed completely, contact your
Toyota dealer.
6Reinstall the filter to the grille.
NOTICE
■If “Maintenance Required for
Traction Battery Cooling
Parts See Owner’s Manual” is
shown on the multi-informa-
tion display
Clean the air intake vents immedi-
ately.
If the vehicle is continuously
driven with the warning message
displayed, it may cause a mal-
function or output restriction of the
traction battery.
Cleaning procedure

4357-3. Do-it-yourself maintenance
Owners Manual_USA_M62064_en
7
Maintenance and care
7 Install the grille.
If “Maintenance Required for
Traction Battery Cooling Parts
See Owner’s Manual” was
displayed on the multi-infor-
mation display
8 Start the fuel cell system and
check that the warning mes-
sage is no longer displayed.
It may be necessary to drive the
vehicle for approximately 20 min-
utes before the warning message is
displayed again then disappears.
If the warning message does not
disappear after some time, have
the vehicle inspected by your Toy-
ota dealer.
■If the dust or sand on the filter
cannot be removed
It is recommended to use a vacuum
cleaner with plastic brushes.
WARNING
■When cleaning the air intake
vents
●Do not use water or other liq-
uids to clean the air intake
vents. If water is applied to the
traction battery or other compo-
nents, a malfunction or fire may
occur.
●Before cleaning the air intake
vents, make sure to turn the
power switch off to stop the fuel
cell system.
●Do not put a han d or leg in the
air intake vent. If it is caught in a
cooling fan, or if it touches a
high voltage part that results in
an electric shock, death or seri-
ous injuries may result.
■When removing the air intake
vent covers
Do not touch the service plug
located near the air intake vents.
(  P. 8 1 )
NOTICE
■When cleaning the air intake
vents
Do not use an ai r blow gun, etc.
Dust may be blown out, possibly
causing a malfunction or output
restriction of the traction battery.
■To prevent damage to the
vehicle
Observe the following precau-
tions:
●Do not allow wa ter or foreign
matter to enter the air intake
vent.
●Make sure to reinstall the filter
and cover to their original posi-
tions after cleaning.

4377-3. Do-it-yourself maintenance
Owners Manual_USA_M62064_en
7
Maintenance and care
1 Take out the mechanical key.
2 Remove the cover.
To prevent damage to the key,
cover the tip of the flathead screw-
driver with a rag.
3Remove the depleted battery.
Insert a new battery with the “+” ter-
minal facing up.
Replacing the batteryWARNING
■Battery precautions
Observe the following precau-
tions.
Failure to do so may result in
death or serious injury.
●Do not swallow the battery.
Doing so may cause chemical
burns.
●A coin battery or button battery
is used in the electronic key. If a
battery is swa llowed, it may
cause severe chemical burns in
as little as 2 hours and may
result in death or serious injury.
●Keep away new and removed
batteries from children.
●If the cover cannot be firmly
closed, stop using the electronic
key and stow the key in the
place where children cannot
reach, and then contact your
Toyota dealer.
●If you accidentally swallow a
battery or put a battery into a
part of your b ody, get emer-
gency medical attention imme-
diately.
■To prevent battery explosion
or leakage of flammable liq-
uid or gas
●Replace the battery with a new
battery of the same type. If a
wrong type of battery is used, it
may explode.
●Do not expose batteries to
extremely low pr essure due to
high altitude or extremely high
temperatures.
●Do not burn, bre ak or cut a bat-
tery.

4417-3. Do-it-yourself maintenance
Owners Manual_USA_M62064_en
7
Maintenance and care
Blown fuse
Type B Normal fuse
Blown fuse
Type CNormal fuse
Blown fuse
Type DNormal fuse
Blown fuse
■After a fuse is replaced
●When installing the lid, make sure
that the tab is ins talled securely.
●If the lights do not turn on even
after the fuse has been replaced,
a bulb may need replacement.
●If the replaced fuse blows again,
have the vehicle inspected by
your Toyota dealer.
■If there is an ove rload in a cir-
cuit
The fuses are designed to blow, pro-
tecting the wiring harness from
damage.
WARNING
■To prevent system break-
downs and vehicle fire
Observe the following precau-
tions.
Failure to do so may cause dam-
age to the vehicle, and possibly a
fire or injury.
●Never use a fuse of a higher
amperage rating than that indi-
cated, or use any other object in
place of a fuse.
●Always use a genuine Toyota
fuse or equivalent.
Never replace a fuse with a
wire, even as a temporary fix.
●Do not modify the fuses or fuse
boxes.
NOTICE
■Before replacing fuses
Have the cause of electrical over-
load determined and repaired by
your Toyota dealer as soon as
possible.

445
Owners Manual_USA_M62064_en
8
8
When trouble arises
When trouble arises
8-1. Essential informationEmergency flashers .... 446
If your vehicle has to be stopped in an emergency.................................. 446
If the vehicle is submerged or water on the road is ris-
ing ............................. 4478-2. Steps to take in an emer-
gency
If your vehicle needs to be towed ......................... 449
If you think s omething is
wrong......................... 453
If a warning light turns on or a warning buzzer sounds.................................. 454
If a warning message is dis- played ........................ 464
If you have a flat tire .... 467
If the fuel cell system will not start ........................... 480
If you lose your keys ... 481
If the fuel door cannot be opened ........ ..............482
If the electro nic key does
not operate properly .. 482
If the 12-volt battery is dis- charged ..................... 485
If your vehicle overheats .................................. 490
If the vehicle becomes stuck .................................. 494

4478-1. Essential information
Owners Manual_USA_M62064_en
8
When trouble arises
briefly 3 times or more in suc-
cession.
5 Stop the vehicle in a safe
place by the road.
If the door can be opened,
open the door and exit the
vehicle.
 If the door can not be opened,
open the window using the
power window switch and
ensure an escape route.
 If the window can be opened,
exit the vehicle through the
window.
 If the door and window cannot
be opened due to the rising
water, remain calm, wait until
the water level inside the
vehicle rises to the point that
the water pressure inside of
the vehicle equals the water
pressure outside of the vehi-
cle and then open the door
after waiting for the rising
water to enter the vehicle, and
exit the vehicle. When the
WARNING
■If the fuel cell system has to
be turned off while driving
Power assist for the steering
wheel will be lost, making the
steering wheel heavier to turn.
Decelerate as much as possible
before turning off the fuel cell sys-
tem.
If the vehicle is sub-
merged or water on
the road is rising
This vehicle is not designed
to be able to drive on roads
that are deeply flooded with
water. Do not drive on roads
where the roads may be
submerged or the water
may be rising. It is danger-
ous to remain in the vehicle,
if it anticipated that the vehi-
cle will be flooded or set a
drift. Remain calm and fol-
low the following.

4488-1. Essential information
Owners Manual_USA_M62064_en
outside water level exceeds
half the height of the door, the
door cannot be opened from
the inside due to water pres-
sure.
■Water level exceeds the floor
When the water level exceeds the
floor and time has passed, the elec-
trical equipment will get damaged,
the power windows will not operate,
the motor stop, and the vehicle may
not be able to get moving.
■Using an emergency escape
hammer*
Laminated glass is used in the wind-
shield on this vehicle.
Laminated glass cannot be shat-
tered with an emergency hammer
*.
Tempered glass is used in the win-
dows on this vehicle.
*: Contact your Toyota dealer or aftermarket accessory manufac-
turer for further information about
an emergency hammer.
WARNING
■Caution while driving
Do not drive on roads where the
roads may be submerged or the
water may be rising. Otherwise
the vehicle may be damaged and
cannot move, as well as become
flooded and set a drift, which may
lead to death.