2020 TOYOTA MIRAI key battery

TABLE OF CONTENTS4
MIRAI_OM_USA_OM62073U6-1. Using the air conditioning
system and defogger
Automatic air conditioning system............................. 306
Heated steering wheel/ seat heaters .................... 315
6-2. Using the interior lights Interior lights list ................ 317• Interior lights ................. 318
• Personal lights .............. 318
6-3. Using the storage features List of storage features...... 320• Glove box...................... 321
• Console box .................. 321
• Cup holders .................. 322
• Bottle holders ................ 324
• Auxiliary box ................. 324
Trunk features ................... 325
6-4. Other interior features Other interior features ....... 327• Sun visors ..................... 327
• Vanity mirrors................ 327
• Clock ............................. 328
• Armrest ......................... 329
• Coat hooks.................... 329
• Assist grips ................... 330
• Power outlet .................. 331
• USB charging ports....... 332
• Wireless charger ........... 334
Garage door opener .......... 343 7-1. Maintenance and care
Cleaning and protecting the vehicle exterior .......... 352
Cleaning and protecting the vehicle interior ........... 356
7-2. Maintenance Maintenance requirements ................... 359
General maintenance ........ 361
7-3. Do-it-yourself maintenance
Do-it-yourself service precautions ...................... 364
Hood .................................. 366
Positioning a floor jack....... 367
Motor compartment ........... 369
12-volt battery .................... 374
Tires................................... 378
Replacing the tire............... 386
Tire inflation pressure ........ 393
Wheels............................... 396
Air conditioning filter .......... 398
Electronic key battery ........ 400
Checking and replacing fuses ................................ 402
Light bulbs ......................... 405
6Interior features7Maintenance and care

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8-1. Essential informationEmergency flashers .......... 408
If your vehicle has to be stopped in an
emergency ...................... 409
If the vehicle is trapped in rising water .................. 410
8-2. Steps to take in an emergency
If your vehicle needs to be towed ......................... 411
If you think something is wrong .............................. 417
If a warning light turns on or a warning buzzer
sounds ............................ 418
If a warning message is displayed ......................... 426
If you have a flat tire .......... 432
If the fuel cell system will not start ........................... 447
If the electronic key does not operate properly ........ 449
If the 12-volt battery is discharged ...................... 452
If your vehicle overheats ... 457
If the vehicle becomes stuck................................ 463 9-1. Specifications
Maintenance data (fuel, fluid level, etc.) ....... 466
Tire information.................. 472
9-2. Customization Customizable features ....... 484
9-3. Items to initialize Items to initialize ................ 494
Reporting safety defects for U.S. owners ........................ 496
Seat belt instructions for Canadian owners
(in French)................................ 497
SRS airbag instructions for Canadian owners
(in French)................................ 499
What to do if... (Troubleshooting) ..................... 510
Alphabetical index ...................... 513
8When trouble arises9Vehicle specifications
10For owners
Index
For information regarding the equipment listed below, refer to the
“NAVIGATION SYSTEM OWNER’S MANUAL”.
• Navigation system
• Audio system• Rear view monitor system
• Hands-free system (for cellular phone)

1304-1. Key information
MIRAI_OM_USA_OM62073U■
Electronic key battery depletion
●The standard battery life is 1 to 2 years.
● If the battery becomes low, an alarm will sound in the cabin wh en the fuel
cell system stops. ( P. 426)
● As the electronic key always receives radio waves, the battery will become
depleted even if the electronic key is not used. The following symptoms indi-
cate that the electronic key battery may be depleted. Replace the battery
when necessary. ( P. 400)
• The smart key system or the wireless remote control does not o perate.
• The detection area becomes smaller.
• The LED indicator on the key surface does not turn on.
● To avoid serious deterioration, do not leave the electronic key within 3 ft.
(1 m) of the following electrical appliances that produce a magnetic field:
•TVs
• Personal computers
• Cellular phones, cordless phones and battery chargers
• Recharging cellular phones or cordless phones
• Table lamps
• Induction cookers
■ Replacing the battery
P. 400
■ Confirmation of the registered key number
The number of keys already registered to the vehicle can be confirmed. Ask
your Toyota dealer for details.
■ If a wrong key is used
The key cylinder rotates freely to isolate inside mechanism.

1334-2. Opening, closing and locking the doors
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Operation of each component
MIRAI_OM_USA_OM62073U
■Operation signals
Doors:
A buzzer sounds and the emergency flashers flash to indicate th at the doors
have been locked/unlocked. (Locked: Once; Unlocked: Twice)
Windows:
A buzzer sounds to indicate that the windows are opening.
■ Security feature
If a door is not opened within approximately 60 seconds after t he vehicle is
unlocked, the security feature automatically locks the vehicle again.
■ When the door cannot be locked by the lock sensor on the surface of the
door handle
■ Door lock buzzer
If an attempt to lock the doors is made when a door is not full y closed, a
buzzer sounds continuously for 5 seconds. Fully close the door to stop the
buzzer, and lock the doors once more.
■ Setting the alarm
Locking the doors will set the alarm system. ( P. 81)
■ If the smart key system or the wireless remote control does not operate
properly
Use the mechanical key to lock and unlock the doors. ( P. 449)
Replace the key battery with a new one if it is depleted. ( P. 400)
When the door cannot be locked even if
the lock sensor on the surface of the door
handle is touched by a finger, touch the
lock sensor with the palm.
When gloves are being worn, remove the
gloves.

1404-2. Opening, closing and locking the doors
MIRAI_OM_USA_OM62073U
■Tr u n k l i g h t
The trunk light turns on when the trunk is opened.
■ Function to prevent th e trunk being locked with the electronic key inside
● When all doors are locked, closing the trunk lid with the elect ronic key left
inside the trunk will sound an alarm.
In this case, the trunk lid can be opened by pressing the trunk release but-
ton on the trunk lid.
● If the spare electronic key is put in the trunk with all the doors locked, the
key confinement prevention function is activated so the trunk can be
opened. In order to prevent theft, take all electronic keys wit h you when
leaving the vehicle.
● If the electronic key is put in the trunk with all the doors lo cked, the key may
not be detected depending on the location of the key and the su rrounding
radio wave conditions. In this case, the key confinement preven tion function
cannot be activated, causing the doors to lock when the trunk i s closed.
Make sure to check where the key is before closing the trunk.
● The key confinement prevention function cannot be activated if any one of
the doors is unlocked. In this case, open the trunk using the t runk opener
switch.
■ Internal trunk release lever
■ Using the mechanical key
The trunk can be also opened using the mechanical key. ( P. 449)
■ Open trunk warning buzzer
If the vehicle speed reaches 3 mph (5 km/h), the master warning light flashes
and a buzzer sounds to indicate that the trunk is not fully clo sed.
■ If the smart key system or the wireless remote control does not operate
properly
Use the mechanical key to unlock the trunk. ( P. 449)
Replace the key battery with a new one if it is depleted. ( P. 400)
■ When leaving a key to the vehicle with a parking attendant
P. 129
■ Customization
The trunk unlocking operation can be changed.
(Customizable features: P. 487)
The trunk lid can be opened by pulling the
glow-in-the-dark lever located on the
inside of the trunk lid upward.
The lever will continue to glow for some
time after the trunk lid is closed.

1454-2. Opening, closing and locking the doors
4
Operation of each component
MIRAI_OM_USA_OM62073U■
When “Smart Key System Malfuncti on See Owner’s Manual” will be dis-
played on the multi-information display
The system may be malfunctioning. Have the vehicle inspected by your
Toyota dealer immediately.
■ Battery-saving function
The battery-saving function will be activated in order to preve nt the electronic
key battery and the 12-volt battery from being discharged while the vehicle is
not in operation for a long time.
● In the following situations, the smart key system may take some time to
unlock the doors.
• The electronic key has been left in an area of approximately 6 ft. (2 m) of
the outside of the vehicle for 10 minutes or longer.
• The smart key system has not been used for 5 days or longer.
● If the smart key system has not been used for 14 days or longer , the doors
cannot be unlocked at any doors except the driver’s door. In th is case, take
hold of the driver’s door handle, or use the wireless remote co ntrol or the
mechanical key, to unlock the doors.
■ Electronic Key battery-Saving Function
When battery-saving mode is set, battery depletion is minimized by stopping
the electronic key from receiving radio waves.
Press twice while pressing and
holding . Confirm that the electronic
key indicator flashes 4 times.
While the battery-saving mode is set, the
smart key system cannot be used. To
cancel the function, press any of the elec-
tronic key buttons.

1464-2. Opening, closing and locking the doors
MIRAI_OM_USA_OM62073U■
Conditions affecting operation
The smart key system uses weak radio waves. In the following si tuations, the
communication between the electronic key and the vehicle may be affected,
preventing the smart key system, wireless remote control and immobilizer
system from operating properly. (Ways of coping: P. 449)
● When the electronic key battery is depleted
● Near a TV tower, electric power plant, gas station, radio stati on, large dis-
play, airport or other facility that generates strong radio wav es or electrical
noise
● When the electronic key is in contact with, or is covered by the following
metallic objects
• Cards to which aluminum foil is attached
• Cigarette boxes that have aluminum 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
● When carrying the electronic key together with the following devices that
emit radio waves
• Portable radio, cellular phone, cordless phone or other wirele ss commu-
nication devices
• Another vehicle’s electronic key or a wireless key that emits radio waves
• Personal computers or personal digital assistants (PDAs)
• Digital audio players
• Portable game systems
● If window tint with a metallic content or metallic objects are attached to the
rear window
● When the electronic key is placed near a battery charger or ele ctronic
devices

1474-2. Opening, closing and locking the doors
4
Operation of each component
MIRAI_OM_USA_OM62073U■
Note for the entry function
●Even when the electronic key is within the effective range (det ection areas),
the system may not operate properly in the following cases:
• The electronic key is too close to the window or outside door handle, near
the ground, or in a high place when the doors are locked or unl ocked.
• The electronic key is near the ground or in a high place, or t oo close to
the rear bumper center when the trunk is opened.
• The electronic key is on the instrument panel, rear package tr ay or floor,
or in the door pockets or glove box when the fuel cell system i s started or
power switch modes are changed.
● Do not leave the electronic key on top of the instrument panel or near the
door pockets when exiting the vehicle. Depending on the radio w ave recep-
tion conditions, it may be detected by the antenna outside the cabin and the
door will become lockable from the outside, possibly trapping the electronic
key inside the vehicle.
● As long as the electronic key is within the effective range, th e doors may be
locked or unlocked by anyone. However, only the doors detecting the elec-
tronic key can be used to unlock the vehicle.
● Even if the electronic key is not inside the vehicle, it may be possible to start
the fuel cell system if the electronic key is near the window.
● The doors may unlock or lock if a large amount of water splashe s on the
door handle, such as in the rain or in a car wash when the elec tronic key is
within the effective range. (The doors will automatically be lo cked after
approximately 60 seconds if the doors are not opened and closed.)
● If the wireless remote control is used to lock the doors when t he electronic
key is near the vehicle, there is a possibility that the door m ay not be
unlocked by the entry function. (Use the wireless remote contro l to unlock
the doors.)
● Touching the door lock or unlock sensor while wearing gloves ma y prevent
lock or unlock operation.
● When the lock operation is performed using the lock sensor, rec ognition sig-
nals will be shown up to two consecutive times. After this, no recognition
signals will be given.
● If the door handle becomes wet while the electronic key is with in the effec-
tive range, the door may lock and unlock repeatedly. In this ca se, follow the
following correction procedures to wash the vehicle:
• Place the electronic key in a location 6 ft. (2 m) or more awa y from the
vehicle. (Take care to ensure that the key is not stolen.)
• Set the electronic key to battery-saving mode to disable the s mart key
system. ( P. 145)
● If the electronic key is inside the vehicle and a door handle b ecomes wet
during a car wash, a message may be shown on the multi-informat ion dis-
play and a buzzer will sound outside the vehicle. To turn off t he alarm, lock
all the doors.