TOYOTA MIRAI 2019 (in English) Manual Online

811-3. Theft deterrent system
1
For safety and security
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
Alar m
The alarm uses light and sound to give an alert when an intrusion is
detected.
The alarm is triggered in the following situations when the ala rm is
set:
● A locked door or trunk is unlocked or opened in any way other t han
using the entry function, wireles s remote control or mechanical key.
(The doors will lock a gain automatically.)
● The hood is opened.
Close the doors, trunk and hood,
and lock all the doors. The system
will be set automatically after 30
seconds.
The indicator changes from being
on to flashing when the system is
set.
Do one of the following to d eactivate or stop the alarm:
● Unlock the doors or open the trunk.
● Turn the power switch to ACCESSORY or ON mode, or start the
fuel cell system. (The alarm wil l be deactivated or stopped after a
few seconds.)
The alarm
Setting the alarm system
Deactivating or stopping the alarm

821-3. Theft deterrent system
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
■System maintenance
The vehicle has a maintenance-free type alarm system.
■ Items to check before locking the vehicle
To prevent unexpected triggering of the alarm and vehicle theft , make sure of
the following:
● Nobody is in the vehicle.
● The windows are closed before the alarm is set.
● No valuables or other personal items are left in the vehicle.
■ Triggering of the alarm
The alarm may be triggered in the following situations:
(Stopping the alarm deactivates the alarm system.)
■ Alarm-operated door lock
In the following cases, depending on the situation, the door ma y automatically
lock to prevent improper entry into the vehicle:
● When a person remaining in the vehicle unlocks the door and the alarm is
activated.
● While the alarm is activated, a person remaining in the vehicle unlocks the
door.
● When recharging or replacing the 12-volt battery
●
A person inside the vehicle opens a
door, the trunk or hood, or unlocks the
vehicle using an inside lock button.
● The 12-volt battery is recharged or
replaced when the vehicle is locked.
(P. 454)
NOTICE
■ To ensure the system operates correctly
Do not modify or remove the system. If modified or removed, the proper
operation of the system cannot be guaranteed.

831-3. Theft deterrent system
1
For safety and security
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
Theft prevention labels
These labels are attached to the
vehicle to reduce vehicle theft by
facilitating the tracing and recov-
ery of parts from stolen vehicles.
Do not remove under penalty of
law

841-3. Theft deterrent system
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)

85
Fuel cell system2
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)2. Fuel cell vehicle
Fuel cell vehicle characteristics ................... 86
Fuel cell vehicle precautions ....................... 90
Advice for driving fuel cell vehicles ........................... 102

862. Fuel cell vehicle
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
Fuel cell vehicle characteristics
This diagram is for illustrative purposes only and may differ from the
actual vehicle.
Fuel cell vehicles efficiently use electricity, which is genera ted
by a chemical reaction between hydrogen and oxygen in a fuel
cell stack, and electricity charged in a traction battery to dr ive
the electric motor (traction motor).
The fuel is H
2 (compressed hydrogen gas), so the exhaust is
only water and water vapor. As they do not release emissions
such as CO
2 (Carbon Dioxide) and NOx (Nitrogen Oxides), fuel
cell vehicles are environm entally friendly vehicles.
Fuel cell vehicle components
Fuel cell stack
Hydrogen tanks
Traction battery Tailpipe
Fuel cell converter
Electric motor (traction motor)

872. Fuel cell vehicle
2
Fuel cell system
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
The electric motor (traction motor) allows smooth, powerful takeoff
and acceleration. This vehicle dr ives similarly to a gasoline vehicle
without any special actions by the driver. ( P. 172) As there are no
engine sounds and the vehicle is q uiet, operation noises unique to
fuel cell vehicle com ponents may be heard. ( P. 8 8 )
The system may behave differently on cold days. It is performin g a
special cold-start process to im prove start-up performance. (P. 189)
Operation noises ( P. 88), purge process ( P. 189), etc., differ from
usual. However, this is not a malfunction.
Compressed hydrogen gas fuel can be filled at hydrogen stations .
Opening the fuel door (P. 213)
Driving the vehicle
Fuel cell system
Fuel filling

882. Fuel cell vehicle
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
■Sounds unique to the fuel cell vehicle
Due to the design of your fuel cell vehicle, there are various relays, valves
and pumps which under normal driving conditions will produce so unds. This
is a normal characteristic of the vehicle and does not indicate a malfunction.
Furthermore, way of hearing may differ based on usage environme nt or con-
dition.
Noticeable soundsSource of the sounds
Clunking, clicking and clack-
ingOperation of relays and hydrogen tank
valves
Sounds may come from under the floor or
behind the rear seats.
(Sounds may be heard when starting the
fuel cell system.)
KnockingThe parking lock is engaged
Sounds may come from the motor
compartment.
(Sounds may be heard when press the P
position switch or stopping the fuel cell
system.)
Whooshing, squealingGas is flowing through the nozzle and
valvesSounds may come from behind the rear
seats, or from the dispenser hose/nozzle.
(Sounds may be heard when filling the
fuel.)
• High pitch sound
• Gurgle sound
• Pulsing soundOperation of the pumpsSounds may come from the motor com-
partment or under the front seats.
(In particular, sounds may be heard when
starting the fuel cell system, accelerating
from a stop, or press the H
2O switch. The
sound may be louder when in Br mode or
when the vehicle decelerates during
dynamic radar cruise control.)
Humming soundOperation of the pumps are speeding up
Sounds may come from the motor com-
partment or under the front seats.
(In particular, sounds may be heard when
accelerating or decelerating.)
Whooshing sound Operation of the hydrogen injectorSounds may come from under the front
seats or behind the rear seats.
(In particular, sounds may be heard when
starting the fuel cell system, driving at low
speeds, or charging the traction battery.)

892. Fuel cell vehicle
2
Fuel cell system
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)■
Regenerative braking
In the following situations, the vehicle generates electricity from the decelera-
tion of the vehicle while driving.
● The accelerator pedal is released while driving with the shift position in D.
● The brake pedal is depressed while driving with the shift posit ion in D.
■ Charging the traction battery
Because electricity generated by the fuel cell stack and regene rative braking
charges the traction battery, the battery does not need to be c harged from an
outside source. However, if the vehicle is left parked for a lo ng time, the trac-
tion battery will slowly discharge. For this reason, be sure to drive the vehicle
at least once every few months for at least 30 minutes or 10 mi les (16 km).
If the traction battery becomes fully discharged and you are unable to start
the fuel cell system, contact your Toyota dealer.
■ Charging the 12-volt battery
P. 454
■ Parking
Because there is no engine sound or vibration, it is easy to mistake the fuel
cell vehicle for being off when it is actually still running, as indicated by the
“READY” indicator being illuminated. For safety, make sure to a lways shift the
shift position to P and apply the parking brake when parked.
■ Maintenance, repair, recycling, and disposal
Contact your Toyota dealer regarding maintenance, repair, recyc ling, and dis-
posal. Do not dispose of the vehicle or any of its components y ourself.
• Humming sound
• High pitch soundOperation of the motor
Sounds may come from the motor com-
partment.
(In particular, sounds may be heard when
accelerating or decelerating.)
Blowing and draining soundExhaust water or air is being purgedSounds may come from the rear of the
vehicle.
May also occur periodically while parked
when it is cold to prevent freezing.
(Sounds may be heard when vehicle is
stopped, fuel cell system is stopped, park-
ing.)
Noticeable soundsSource of the sounds

902. Fuel cell vehicle
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
Fuel cell vehicle precautions
The fuel cell vehicle has hydrogen tanks (10150 psi [70 MPa,
714 kgf/cm2, 700 bar]), fuel cell stack, and hydrogen pipelines as
hydrogen-related components. Pay attention to all warning label s
attached to the vehicle.
This diagram is for illustrative purposes only and may differ f rom the
actual vehicle.
Hydrogen-related components
Warning label
Hydrogen detectors
Fuel cell stack Hydrogen tanks
Hydrogen tank valves
Hydrogen pipelines