key battery TOYOTA MIRAI 2022 User Guide

1334-2. Opening, closing and locking the doors and trunk
Owners Manual_USA_M62084_en
4
Before driving
doors detecting the electronic key
can be used to unl ock the vehicle.
●Even if the electronic key is not
inside the vehicle, it may be possi-
ble to start the fuel cell system if
the electronic key is near the win-
dow.
●The doors may unlock or lock if a
large amount of water splashes on
the door handle, such as in the
rain or in a car wash, when the
electronic key is within the effec-
tive range. (The doors will auto-
matically be locked after
approximately 60 seconds if the
doors are not opened and closed.)
●If the wireless remote control is
used to lock the doors when the
electronic key is near the vehicle,
there is a possib ility that the door
may not be unlocke d by the entry
function. (Use the wireless remote
control to unloc k the doors.)
●Touching the door lock sensor
while wearing gloves may delay or
prevent lock operation.
●When the lock op eration is per-
formed using the lock sensor, rec-
ognition signals will be shown up
to two consecutive times. After
this, no recogniti on signals will be
given.
●If the door handle becomes wet
while the electronic key is within
the effective ran ge, the door may
lock and unlock repeatedly. In this
case, follow the fo llowing correc-
tion procedures to wash the vehi-
cle:
• Place the electronic key in a loca- tion 6 ft. (2 m) or more away from
the vehicle. (Take care to ensure
that the key is not stolen.)
• Set the electronic key to battery- saving mode to disable the smart
key system. ( P.131)
●If the electronic key is inside the
vehicle and a door handle
becomes wet during a car wash, a
message may be shown on the
multi-informatio n display and a buzzer will sound outside the vehi-
cle. To turn off the alarm, lock all
the doors.
●The lock sensor may not work
properly if it comes into contact
with ice, snow, m
ud, etc. Clean
the lock sensor and attempt to
operate it again.
●A sudden approach to the effec-
tive range or door handle may pre-
vent the doors from being
unlocked. In this case, return the
door handle to the original position
and check that t he doors unlock
before pulling the door handle
again.
●If there is another electronic key in
the detection area, it may take
slightly longer to unlock the doors
after the door handle is gripped.
■When the vehicle is not driven
for extended periods
●To prevent theft of the vehicle, do
not leave the electronic key within
6 ft. (2 m) of the vehicle.
●The smart key system can be
deactivated in advance.
●Setting the electronic key to bat-
tery-saving mode helps to reduce
key battery depletion. ( P.131)
■To operate the system properly
●Make sure to carry the electronic
key when operating the system.
Do not get the electronic key too
close to the vehicle when operat-
ing the system from the outside of
the vehicle.
Depending on the position and hold-
ing condition of the electronic key,
the key may not be detected cor-
rectly and the system may not oper-
ate properly. (The alarm may go off
accidentally, or the door lock pre-
vention function m ay not operate.)
●Do not leave the electronic key
inside the trunk.
The key confinement prevention
function may not operate, depend-

1735-2. Driving procedures
Owners Manual_USA_M62084_en
5
Driving
Shutdown Due to Freezing Stop in
a Safe Place See Owner’s Man-
ual” may be displayed in the multi-
information display.
The fuel cell system is frozen and
cannot be started. Contact your Toy-
ota dealer.
●The power output will be tempo-
rarily limited until the fuel cell sys-
tem reaches full operating
temperature.
●When the traction battery is
extremely cold (below approxi-
mately -22˚F [-3 0˚C]) under the
influence of outsi de temperature,
it may not be poss ible to start the
fuel cell system. In this case, try to
start the fuel ce ll system again
after the temperat ure of the trac-
tion battery increases due to the
outside temperature increase etc.
■If the fuel cell system does not
start
●The immobilizer system may not
have been deactivated. ( P. 6 9 )
Contact your Toyota dealer.
●If a message related to start-up is
shown on the multi-information
display, read the message and fol-
low the instructions.
●Check that the fuel door is closed.
When the fuel doo r is open, the
fuel cell system cannot be started.
Close the fuel door before starting
the system. ( P.205)
■Sounds and vibrations specific
to a fuel cell vehicle
 P. 7 5
■If the 12-volt battery is dis-
charged
The fuel cell system cannot be
started using the smart key system.
Refer to P.471to res tart the fuel cell
system.
■Electronic key battery depletion
 P. 1 1 8
■Conditions affecting operation
 P.132
■Notes for the entry function
 P.132
■If “Smart Key System Malfunc-
tion See Owner’s Manual” is
displayed on the multi-informa-
tion display
The system may be malfunctioning.
Have the vehicle inspected by your
Toyota dealer immediately.
■Steering lock function
●After turning the power switch off
and opening and closing the
doors, the steeri ng wheel will be
locked due to the steering lock
function. Operating the power
switch again automatically can-
cels the steering lock.
●When the steering lock cannot be
released, “Push Power Switch
while Turning Steering Wheel in
Either Direction” will be displayed
on the multi-information display.
Press the power switch shortly
and firmly while turning the steer-
ing wheel left and right.
●To prevent the steering lock motor
from overheating , the motor may
be suspended if the fuel cell sys-
tem is turned on and off repeat-
edly in a short period of time. In
this case, refrain from operating
the power switch. After about 10
seconds, the steering lock motor
will resume functioning.
■If the “READY” indicator does
not come on
In the event that the “READY” indi-
cator does not come on even after

1745-2. Driving procedures
Owners Manual_USA_M62084_enperforming the proper procedures
for starting the vehicle, contact your
Toyota dealer immediately.
■If the fuel cell system is mal-
functioning
 P. 4 5 1
■Electronic key battery
 P. 4 2 3
■Operation of the power switch
●If the switch is not pressed shortly
and firmly, the power switch mode
may not change or the fuel cell
system may not start.
●If attempting to restart the fuel cell
system immediately after turning
the power switch off, the fuel cell
system may not start in some
cases. After turn ing the power
switch off, please wait a few sec-
onds before restarting the fuel cell
system.
■Customization
If the smart key system has been
deactivated in a customized setting,
refer to P.468.1 Stop the vehicle completely.
2 Set the parking brake.
( P.183)
3 Press the P position switch.
( P.178)
Check that the shif t position indica-
tor shows P and the parking brake
indicator is illuminated.
4 Press the power switch.
The fuel cell system will stop, and
the meter disp lay will be extin-
guished (the shift position indicator
will be extinguished a few seconds
after the meter display).
5 Release the brake pedal and
check that “ACCESSORY” or
“IGNITION ON” is not shown
on the meter.
■Stopping the fuel cell system in
cold temperatures
●When the power switch is pressed
and the fuel cell system is stopped
WARNING
■When starting the fuel cell
system
Always start the fuel cell system
while sitting in the driver’s seat.
Do not depress the accelerator
pedal while starting the fuel cell
system under any circumstances.
Doing so may cause an accident
resulting in death or serious injury.
■Caution while driving
If fuel cell system failure occurs
while the vehicle is moving, do not
lock or open the doors until the
vehicle reaches a safe and com-
plete stop. The steering lock func-
tion will activate and this may lead
to an accident, resulting in death
or serious injury.
NOTICE
■When starting the fuel cell
system
If the fuel cell system becomes
difficult to start, have your vehicle
checked by your Toyota dealer
immediately.
■Symptoms indicating a mal-
function with the power
switch
If the power switch seems to be
operating somewhat differently
than usual, such as the switch
sticking slightly, there may be a
malfunction. Contact your Toyota
dealer immediately.
Stopping the fuel cell sys-
tem

1925-3. Operating the lights and wipers
Owners Manual_USA_M62084_en
■Headlight control sensor
The sensor may not function prop-
erly if an object is placed on the sen-
sor, or anything that blocks the
sensor is affixed to the windshield.
Doing so interfere s with the sensor
detecting the level of ambient light
and may cause the automatic head-
light system to malfunction.
■Automatic light off system
●When the headlights are on: The
headlights and tail lights turn off
30 seconds after the driver’s door
is opened and clos ed if the power
switch is turned to ACC or off.
(The lights turn off immediately if
on the key is pressed after all
the doors are closed.)
●When only the tail lights are on:
The tail lights tu rn off automati-
cally if the power switch is turned
to ACC or off and the driver’s door
is opened.
To turn the lights on again, turn the
power switch to ON, or turn the light
switch off once and then back to
or .
■Light reminder buzzer
A buzzer sounds when the power
switch is turned off or turned to ACC
and the driver’s door is opened
while the lights are turned on.
■Automatic headlight leveling
system (if equipped)
The level of the headlights is auto-
matically adjusted according to the
number of passengers and the load-
ing condition of the vehicle to ensure that the headlights do not
interfere with other road users.
■Windshield wiper linked head-
light illumination
When driving during daytime with
the headlight switch turned to , if
the windshield wipers are used, the
headlights will turn o n automatically
after several seconds to help
enhance the visibility of your vehi-
cle.
■12-volt battery-saving function
In order to prevent the 12-volt bat-
tery of the vehicle from discharging,
if the headlights and/or tail lights are
on when the power switch is turned
off the 12-volt battery saving func-
tion will operate and automatically
turn off all the lig hts after approxi-
mately 20 minutes. When the power
switch is turned to ON, the 12-volt
battery-saving function will be dis-
abled.
When any of the following are per-
formed, the 12-volt battery-saving
function is canceled once and then
reactivated. All the lights will turn off
automatically 20 minutes after the
12-volt battery-saving function has
been reactivated:
●When the headlight switch is oper-
ated
●When a door or the trunk is
opened or closed
■Customization
Some functions can be customized.
(  P.498)
NOTICE
■To prevent 12-volt battery dis-
charge
Do not leave the lights on longer
than necessary when the fuel cell
system is off.

3486-2. Using the interior lights
Owners Manual_USA_M62084_en
1Select .
2 Select “Illumination Color”.
3 Select the desired color.
■Illuminated entry system
The lights automatically turn on/off
according to the power switch
mode, the presence of the elec-
tronic key, whether the doors are
locked/unlocked, and whether the
doors are open/closed.
■To prevent the 12-volt battery
from being discharged
If the interior lights remain on when
the power switch is turned off, the
lights will go off automatically after
20 minutes.
■When the interior lights or front
personal lights do not respond
as normal
●When water, dirt, etc., have
adhered to the lens surface
●When operated with a wet hand
●When wearing gloves, etc.
■The interior lights may turn on
automatically when
If any of the SRS airbags deploy
(inflate) or in the event of a strong
rear impact, the interior lights will
turn on automatically.
The interior lights will turn off auto-
matically after approximately 20min-
utes.
The interior lights can be turned off
manually. However, in order to help
prevent further collisions, it is rec-
ommended that they be left on until
safety can be ensured.
(The interior lights may not turn on
automatically depending on the
force of the impact and conditions of
the collision.)
■Customization
Some functions can be customized.
(  P.498)
NOTICE
■To prevent 12-volt battery dis-
charge
Do not leave the lights on longer
than necessary when the fuel cell
system is off.
■Removing light lenses
Never remove the lens for the
interior lights and front personal
lights. Otherwise, the lights will be
damaged. If a lens needs to be
removed, contact your Toyota
dealer.

3616-4. Using the other interior features
Owners Manual_USA_M62084_en
6
Interior features
Pull the armrest down for use.
WARNING
●Do not attempt t o dismantle for
disassembly or modifications
●Do not hit or apply a strong
force
NOTICE
■Conditions in wh ich the func-
tion may not operate cor-
rectly
In the following conditions, it may
not operate correctly
●The portable device is fully
charged
●There is foreign matter between
the charge area and portable
device
●The temperature of the portable
device gets higher from
charging
●The charging surface of the por-
table device is facing up
●The placement of the portable
device is out of alignment with
the charge area
●Near a TV tower, electric power
plant, gas station, radio station,
large display, airport or other
facility that generates strong
radio waves or electrical noise
●When the portable device is in
contact with, or is covered by
the following metallic objects
• Cards to which aluminum foil is attached
• Cigarette boxes that have alu- minum foil inside
• Metallic wallets or bags
• Coins
• Hand warmers made of metal
• Media such as CDs and DVDs
●When other wireless keys (that
emit radio waves) are being
used nearby
In addition, excluding the above-
mentioned, when the charger
does not perform normally or the
operation display lamp is flashing
continuously, it is considered that
the wireless char ger is malfunc-
tioning. Contact authorized Toyota
dealer.
■To prevent failure or damage
to data
●Do not bring magnetic cards,
such as credit cards, or mag-
netic recording media, etc.,
close to the charger while
charging, otherwise, data may
disappear under the influence of
magnetism. Also, do not bring
precision instruments such as
wrist watches, etc., close to the
charger, as such objects may
break.
●Do not leave portable devices in
the cabin. The temperature
inside the cabin may become
high, when under the sun, and
cause damage to the device.
■To prevent 12-volt battery dis-
charge
When the fuel cell system is
stopped, do not use the wireless
charger for a long time.
Armrest

3636-4. Using the other interior features
Owners Manual_USA_M62084_en
6
Interior features
■The power outlet can be used
when
The power switch i s in ACC or ON.
■When stopping the fuel cell sys-
tem
Disconnect electrical devices with
charging functions, such as mobile
battery packs. If such devices are
left connected, the fuel cell system
may not stop normally.
Please use as a power supply
for electronic devices that use
less than 120 VAC (power con-
sumption of 1500 W).
■Using the power outlets
Rear of the console box
Open the lid.
NOTICE
■To avoid damaging the power
outlet
Close the power outlet lid when
the power outlet is not in use.
Foreign objects or liquids that
enter the power outlet may cause
a short circuit.
■To prevent the fuse from
being blown
Do not use an accessory that
uses more than 12 V 10 A.
■To prevent inc orrect opera-
tion of the vehicle
When turning the power switch
off, make sure to disconnect
accessories designed for
charging, such as portable char-
gers, power banks, etc., from the
power outlet.
If such an accesso ry is left con-
nected, the following may occur:
●The doors cannot be locked
using the smart key system or
wireless remote control.
●The opening screen will be dis-
played on the multi-information
display.
●The interior lights, instrument
panel lights, etc., will illuminate.
■To prevent 12-volt battery dis-
charge
Do not use the p ower outlet lon-
ger than necessary when the fuel
cell system is off.
Power outlets (120 VAC)
(if equipped)

379
Owners Manual_USA_M62084_en
7
7
Maintenance and care
Maintenance and care
7-1. Maintenance and careCleaning and protecting the vehicle exterior .......... 380
Cleaning and protecting the vehicle interior ........... 384
7-2. Maintenance Maintenance requirements.................................. 387
General maintenance.. 388
7-3. Do-it-yourself mainte- nance
Do-it-yourself service pre- cautions ..................... 391
Hood ........................... 393
Positioning a floor jack 393
Fuel cell unit compartment .................................. 395
12-volt battery ............. 400
Tires ............................ 403
Replacing the tire ........ 411
Tire inflation pressure.. 415
Wheels ......... ...............417
Air conditioning filter .... 419
Cleaning the traction battery air intake vents and filters.................................. 420
Electronic key battery.. 423
Checking and replacing fuses.......................... 425
Headlight aim .............. 428
Light bulbs................... 429

3807-1. Maintenance and care
Owners Manual_USA_M62084_en
7-1.Maintenance and care
Working from top to bottom,
liberally apply water to the
vehicle body, wheel wells and
underside of the vehicle to
remove any dirt and dust.
 Wash the vehicle body using
a sponge or soft cloth, such
as a chamois.
 For hard-to-remove marks,
use car wash soap and rinse
thoroughly with water.
 Wipe away any water.
 Wax the vehicle when the
waterproof coating deterio-
rates.
If water does not bead on a clean
surface, apply wax when the vehi-
cle body is cool.
■Self-restoring coat
The vehicle body has a self-restor-
ing coating that is resistant to small
surface scratches caused in a car
wash etc.
●The coating lasts for 5 to 8 years
from when the vehicle is delivered
from the plant.
●The restoration time differs
depending on t he depth of the
scratch and outside temperature. The restoration time may become
shorter when the coating is
warmed by applying warm water.
●Deep scratches caused by keys,
coins, etc. cannot be restored.
●Do not use wax that contains
abrasives.
■Automatic car washes
●Before washing the vehicle:
• Fold the mirrors
Start washing from the front of the
vehicle. Extend the mirrors before
driving.
●Brushes used in automatic car
washes may scratch the vehicle
surface, parts (wheel, etc.) and
harm your vehicle’s paint.
●When it is necessary to set the
power switch to ACC with the shift
position held in N , refer to P.181.
■High pressure car washes
●As water may enter the cabin, do
not bring the nozzle tip near the
gaps around the doors or perime-
ter of the windows, or spray these
areas continuously.
●Turn the power switch off.
■When using a car wash
If the door handle becomes wet
while the electronic key is within the
effective range, the door may lock
and unlock repeatedly. In that case,
follow the following correction pro-
cedures to wash the vehicle:
●Place the key in a position 6 ft. (2
m) or more separate from the
vehicle while the vehicle is being
washed. (Take care to ensure that
the key is not stolen.)
●Set the electronic key to battery-
saving mode to disable the Smart
key system. ( P.131)
■Wheels and wheel ornaments
●Remove any dirt immediately by
using a neutral detergent.
●Wash detergent off with water
Cleaning and protect-
ing the vehicle exte-
rior
Perform cleaning in a man-
ner appropriate to each
component and its material.
Cleaning instructions

4007-3. Do-it-yourself maintenance
Owners Manual_USA_M62084_en
The 12-volt battery is located in
the right-hand side of the trunk.
Remove the luggage mat: P. 3 5 2
■Before recharging
When recharging, the 12-volt bat-
tery produces hydrogen gas which
is flammable and explosive. There-
fore, observe the following precau-
tions before recharging:
●If recharging with the 12-volt bat-
tery installed on the vehicle, be
sure to disconnect the ground
cable.
●Make sure the charger is off when
connecting and disconnecting the
charger cables to the 12-volt bat-
tery.
■After recharging/reconnecting
the 12-volt battery
●Unlocking the doors using the
smart key system may not be pos-
sible immediately after reconnect-
ing the 12-volt battery. If this
happens, use the wireless remote
control or the mechanical key to
lock/unlock the doors.
●Start the fuel cell system with the
power switch in ACC. The fuel cell
system may not start with the
power switch turned off. However,
the fuel cell system will operate
normally from the second attempt.
WARNING
■When adding washer fluid
Do not add washer fluid when the
fuel cell system is hot or operating
as washer fluid contains alcohol
and may catch fire if spilled on the
fuel cell system, etc.
NOTICE
■Do not use any fluid other
than washer fluid
Do not use soapy water or anti-
freeze instead of washer fluid.
Doing so may cause streaking on
the vehicle’s painted surfaces, as
well as damaging the pump lead-
ing to problems of the washer
fluid not spraying.
■Diluting washer fluid
Dilute washer fluid with water as
necessary.
Refer to the freezing tempera-
tures listed on the label of the
washer fluid bottle.
12-volt batter y
Location