change key battery TOYOTA MIRAI 2022 Owners Manual

1324-2. Opening, closing and locking the doors and trunk
Owners Manual_USA_M62084_en
●Electronic keys that will not be
used for long periods of time can
be set to the battery-saving mode
in advance.
■Conditions affecting operation
The smart key system uses weak
radio waves. In the following situa-
tions, 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.468)
●When the electronic key battery is
depleted
●Near a TV tower, electric power
plant, gas station , radio station,
large display, airpo rt or other facil-
ity that generates strong radio
waves or electrical noise
●When carrying a portable radio,
cellular phone, cordless phone or
other wireless communication
device
●When the electronic key is in con-
tact with, or is covered by the fol-
lowing metallic objects
• Cards to which al uminum foil is
attached
• Cigarette boxes that have alumi- num 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
• Another electronic key or a wire- less key that emits radio waves
• Personal computers or personal digital assistants (PDAs)
• Digital audio players
• Portable game systems
●If window tint wit h a metallic con-
tent or metallic objects are
attached to the rear window
●When the electronic key is placed
near a battery charger or elec-
tronic devices
●When the vehicle is parked in a
pay parking spot where radio
waves are emitted.
■Note for the entry function
●Even when the electronic key is
within the effective range (detec-
tion areas), the system may not
operate properly in the following
cases:
• The electronic key is too close to the window or outside door han-
dle, near the ground, or in a high
place when the doors are locked
or unlocked.
• The electronic key is near the ground or in a high place, or too
close to the center of the rear
bumper when the trunk is opened.
• The electronic key is on the instru- ment panel, rear package tray or
floor, or in the door pockets or
glove box when the fuel cell sys-
tem is 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
wave reception conditions, it may
be detected by the antenna out-
side the cabin and the doors 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, the
doors may be locked or unlocked
by anyone. However, only the

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

4708-2. Steps to take in an emergency
Owners Manual_USA_M62084_en
1With the P shift position
selected, firmly depress the
brake pedal.
2 Touch the Toyota emblem
side of the electronic key to
the power switch.
When the electronic key is
detected, a buzzer sounds and the
power switch will turn to ON.
When the smart key system is
deactivated in customization set-
ting, the power switch will turn to
ACC.
3Firmly depress the brake
pedal and check that is
shown on the multi-informa-
tion display.
4 Press the power switch.
In the event that the fuel cell
system still cannot be started,
contact your Toyota dealer.
■Stopping the fuel cell system
Set the parking brake, shift the shift
position to P and press the power
switch as you no rmally do when
stopping the fuel cell system.
■Electronic key battery
As the above proce dure is a tempo-
rary measure, it is recommended
that the electronic key battery be
replaced immediatel y when the bat-
tery is depleted. ( P.423)
■Alarm (For Canada)
Using the mechanical key to lock
the doors will not set the alarm sys-
tem. If a door is unlocked using the
mechanical key when the alarm sys-
tem is set, the alarm may be trig-
gered. ( P.70)
■Changing power switch modes
Release the brake pedal and press
the power switch in step 3 above.
The fuel cell system does not start
and modes will be changed each
time the switch is pressed. ( P.176)
Starting the fuel cell sys-
tem