display TOYOTA MIRAI 2018 (in English) Manual Online

3728-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
*1: Brake warning buzzer: When there is a malfunction that leads to a decline in the brak e effective-
ness, a buzzer sounds while at the same time a warning light co mes on.
*2: Parking brake engaged warning buzzer:
P. 186
*3: Open door warning buzzer:
A buzzer will sound if the vehicle reaches a speed of 3 mph (5 km/h) or
more with any door open.
*4: Driver’s and front passenger’s seat belt warning buzzer:
The driver’s seat belt warning buzzer sounds to alert the drive r that his or
her seat belt is not fastened. Once the power switch is turned to ON mode,
the buzzer sounds for 6 seconds. If the vehicle reaches a speed of 12 mph
(20 km/h), the buzzer sounds once. If the seat belt is still unfastened after
24 seconds, the buzzer will sound intermittently for 10 seconds . Then, if
the seat belt is still unfastened, the buzzer will sound in a d ifferent tone for
20 more seconds.
The front passenger’s seat belt warning buzzer sounds to alert the front
passenger that his or her seat belt is not fastened. The buzzer sounds
once if the vehicle reaches a speed of 12 mph (20 km/h). If the seat belt is
still unfastened after 24 seconds, the buzzer will sound intermittently for
10 seconds. Then, if the seat belt is still unfastened, the buzzer will sound
in a different tone for 20 more seconds.
*5: This light illuminates on the multi-information display.
Brake Override System/Drive-Start Control warning
light
*5
Indicates that:
• The Brake Override System is operating;
• The Brake Override System is malfunctioning (with warning buzzer);
• The Drive-Start Control is operating (with warning buzzer); or
• The Drive-Start Control is malfunctioning (with warning
buzzer)
 Follow the instruction that are displayed on the multi-
information display.
Warning lightWarning light/Details/Actions

3768-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
If a warning message is displayed
Multi-information display
Master warning light
The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the multi-
information display.
If any of the warning messages are shown again after the following
actions have been performed, contact your Toyota dealer.
The warning lights and warning buzzers operate as follows depending
on the content of the message. If a message indicates the need for
inspection by a dealer, have the vehicle inspected by your Toyota
dealer immediately.
The multi-information display shows warnings of system mal-
functions, incorrectly performed operations, and messages that
indicate a need for maintena nce. When a message is shown,
perform the correction procedur e appropriate to the message.
Messages and warnings
System
warning light
Warning buzzer*Warning
Comes on 
Sounds Indicates an important situation,
such as when a system related to
driving is malfunctioning or that
danger may result if the correction
procedure is not performed

Comes
on or
flashes
Sounds
Indicates an important situation,
such as when the systems shown
on the multi-information display
may be malfunctioning
FlashesSounds
Indicates a situation, such as
when damage to the vehicle or
danger may result

3778-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
8
When trouble arises
*: A buzzer sounds the first time a message is shown on the multi-informa-
tion display.
■ System warning lights
The master warning light does not come on or flash in the following cases.
Instead, a separate system warning light will come on along wit h a message
shown on the multi-information display.
● Malfunction of the ABS
The ABS warning light comes on. ( P. 370)
● Malfunction of the charging system
The charging system warning light comes on. ( P. 3 6 9 )
■ If “High FC Temperature Reduced Power” is displayed
Lower the speed while check the safety, and run the vehicle like this for
several minutes.
If the message goes off, the vehicle can be driven as is, since it temporarily
overheated.
This message may be displayed when driving under severe operati ng con-
ditions.
(For example, when driving up a long steep hill.)
■ If “FC System Shutdown due to F reezing conditions Stop Your Veh icle in
a Safe Place and Contact Your Dealer” is displayed.
The fuel cell system is frozen and can not be started. Contact a Toyota
dealer.
■ If “Maintenance Required for Hybrid Battery Cooling Parts at Yo ur
Dealer” is displayed
The filter may be clogged, the air intake vent may be blocked or there may be
a gap in the duct. Have maintenance performed on the traction b attery cool-
ing component at your Toyota dealer.
Comes onDoes not sound
Indicates a condition, such as mal-
function of electrical components,
their condition, or indicates the
need for maintenance
FlashesDoes not sound
Indicates a situation, such as
when an operation has been per-
formed incorrectly, or indicates
how to perform an operation cor-
rectly
System
warning
light
Warning buzzer*Warning

3788-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U■
If “Shift to P Before Exiting Vehicle” is displayed
Message is displayed when the driver’s door is opened without t urning the
power switch to off with the shift position in any position oth er than P.
Shift the shift position to P.
■ If “Shift is in N Release Accelerator Before Shifting” is displ ayed
Message is displayed when the accelerator pedal has been depressed and
the shift position is in N. Release the accelerator pedal and s hift the shift posi-
tion to D or R.
■ If “Press Brake When Vehicle is Stopped FC System may Overheat” is
displayed
Message is displayed when the accelerator pedal is depressed to maintain
the vehicle position when stopped on an upward slope, etc.
If this continues, the fuel cell system may overheat.
Release the accelerator pedal and depress the brake pedal.
■ If “Accelerator Pedal is Pressed Check The Accelerator Pedal” i s dis-
played
The accelerator pedal may be stuck.
If the message does not disappear even when the foot has been removed
from the accelerator pedal, check that the accelerator pedal is not stuck.
■ If “Ion Filter Maintenance Requi red Visit Your Dealer” is displayed
Ion filter replacement is necessary. Contact your Toyota dealer .
■ If “Shift System Malfunction St op Your Vehicle in a Safe Place then See
Owner’s Manual” is displayed
The shift position may not be able to be shifted. Stop the vehi cle in a safe
place.
Contact your Toyota dealer immediately.
■ If “Shift System Malfunction Shi fting Unavailable See Owner’s M anual”
is displayed
The shift position may not be able to be shifted from P to a position other than
P.
Contact your Toyota dealer immediately.
■ If “Shift System Malfunction When Parking, Apply Parking Brake
Securely then See Owner’s Manual” is displayed
●The parking lock mechanism may not operate.
● The automatically P position selection function ( P. 177) may not operate.
● The power switch may not turn off. In that case, engage the par king brake
and the switch can be turned to off.
● The fuel cell system may not be able to be started.
When parking, choose a flat surface and be sure to engage the p arking
brake.
Have the vehicle inspected by your Toyota dealer immediately.

3798-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
8
When trouble arises
■If “[P] Switch Malfunction When Parking, Apply Parking Brake Se curely
then See Owner’s Manual” is displayed
The shift position may not switch to P even though the P position switch is
pressed.
When parking, choose a flat surface and be sure to engage the p arking
brake.
Have the vehicle inspected by your Toyota dealer immediately.
■ If “Shift System Malfunction See Owner’s Manual” is displayed
If left as is, the system may not operate properly and an unexp ected hazard
or damage may occur.
Have the vehicle inspected by your Toyota dealer immediately.
■ If “Insufficient Aux Battery Charge When Parking, Apply Parking Brake
Securely then See Owner’s Manual” is displayed
● The parking lock mechanism may not operate.
● The power switch may not turn off. In that case, engage the par king brake
and the switch can be turned to off.
● Even after charging the 12-volt battery, the warning message ma y continue
to be displayed until the shift position is shifted from P to a position other
than P.
● The fuel cell system may not be able to be started.
When parking, choose a flat surface and be sure to engage the p arking
brake.
Have the 12-volt battery charged or replaced.
■ If “Insufficient Aux Battery Cha rge Shift is Unavailable See Ow ner’s
Manual” is displayed
Due to the voltage of the 12-volt battery being in a declined c ondition, when
trying to shift the shift position the warning message is displ ayed.
Have the 12-volt battery charged or replaced.
■ If “Shifting Temporarily Unavaila ble Wait a Moment and Try Agai n” is
displayed
A warning message is displayed when the shift lever and P posit ion switch
are repeatedly operated over a short period of time.
Shift the shift position after waiting for short amount of time .
■ If “Shifting to [Br] Mode Unavailable Shift to [D] once, then S hift to [Br]”
is displayed
When the shift position is in P or N, a warning message is disp layed when try-
ing to shift to Br mode.
Shift to Br mode after the shift position had been set to D.
■ If “Shifted to [N] Position Shift to [D] once, then Shift to [B r]” is dis-
played
When the shift position is in R, a warning message is displayed when trying to
shift to Br mode.
The shift position is changed to N.
Shift to Br Mode after the shift position has been set to D.

3808-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U■
If “Shifting to [D] or [R] Position Unavailable Try to Shift af ter FC System
has Started” is displayed
When the power switch is in ON mode (“READY” indicator switched off), a
warning message is displayed when trying to shift the shift position to R or D,
or shift to Br mode.
After starting the fuel cell system, shift the shift position t o R or D, or shift to Br
mode.
■ If “Shifting Unavailable Press Brake Pedal before Shifting” is displayed
A warning message is displayed when attempting to shift the shi ft position
without depressing the brake pedal.
Depress the brake pedal and shift the shift position when chang ing it from P.
■ If “Shifted to [N] Position Stop Your Vehicle before Shifting t o [D]” is dis-
played
While the vehicle is moving backward, a warning message is disp layed when
attempting to shift the shift position to D.
The shift position is changed to N.
Shift the shift position after stopping the vehicle.
■ If “Shifted to [N] Position Stop Your Vehicle before Shifting t o [R]” is dis-
played
When the vehicle is moving forward, a warning message is displa yed when
attempting to shift the shift position to R.
The shift position is changed to N.
Shift the shift position after stopping the vehicle.
■ If “Shifted to [N] Position To Shift to [P], Stop Your Vehicle and Press [P]
Switch” is displayed
When the vehicle is moving, a warning message is displayed when the P
position switch is operated and attempting to shift the shift p osition to P.
The shift position is changed to N.
Operate the P position switch after the vehicle has been brough t to a com-
plete stop.
■ If “Smart Entry & Start System M alfunction See Owner’s Manual” is dis-
played
P. 133
■ Warning buzzer
P. 374

3888-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
Inflate the tire until the specifiedair pressure is reached.
The sealant will be injected
and the pressure will spike to
44 psi (300 kPa, 3.1 kgf/cm
2
or bar) or 58 psi (400 kPa,
4.1 kgf/cm2 or bar), and then
gradually decrease.
The air pressure gauge will
display the actual tire infla-
tion pressure about 1 minute
(15 minutes at low tempera-
ture) after the switch is
turned on.
Inject to specified air pres-
sure.
• Turn the compressor switch off and then check the tire
inflation pressure. Being
careful not to over inflate,
check and repeat the infla-
tion procedure until the
specified tire inflation pres-
sure is reached.
• If the tire inflation pressure is still lower than the specified point
after inflation for 10 minutes ( 40 minutes at low temperature) with
the switch on, the tire is too damaged to be repaired. Turn the
compressor switch off and c ontact your Toyota dealer.
• If the tire inflation pressure exceeds the specified air press ure, let
out some air to adjust the tire inflation pressure. ( P. 421)

3998-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
8
When trouble arises
■Key linked functions
Depress the brake pedal.
Touch the power switch with the
Toyota emblem side of the elec-
tronic key facing away from the
switch.
When the electronic key is
detected, a buzzer sounds and the
power switch will turn to ON mode.
When the smart key system is
deactivated in customization set-
ting, the power switch will turn to
ACCESSORY mode.
Firmly depress the brake pedal
and check that message is dis-
played on the multi-information
display.
Press the power switch.
In the event that the fuel cell system still cannot be started, contact
your Toyota dealer.
Closes the windows* (turn and hold)
Opens the windows
* (turn and hold)
*: These settings must be customized at your Toyota dealer. ( P. 437)
Starting the fuel cell system

4068-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
If your vehicle overheats
The following may indicate that your vehicle is overheating.
● The high coolant temperature warning light ( P. 369) comes on
or flashes, or a loss of fuel ce ll system power is experienced. (For
example, the vehicle s peed does not increase.)
● “FC System Overheat Output Power is Limited” ( P. 376) is dis-
played on the multi-in formation display
● Steam comes out from under the hood.
Label
Fuel cell stack coolant
reservoir Inverter coolant reservoir

4098-2. Steps to take in an emergency
MIRAI_OM_USA_OM62025U
8
When trouble arises
■If “FC System Overheat Output Power is Limited” is displayed
on the multi-information display
Stop the vehicle in a safe place and turn off the air conditioning
system, and then stop th e fuel cell system.
If you see steam or coolant leaks:
Carefully lift the hood after the steam subsides.
If you do not see steam or coolant leaks:
Carefully lift the hood.
After the fuel cell system has
cooled down, inspect the
hoses and radiator core
(radiator) for any leaks.
Inverter coolant radiator
Electric cooling fans
If a large amount of coolant
leaks, immediately contact
your Toyota dealer.
The inverter coolant level is
satisfactory if it is between
the “FULL” and “LOW” lines
on the reservoir.Inverter coolant reservoir
“FULL”
“LOW”
Add inverter cool ant if neces-
sary.
Water can be used in an emer-
gency if inverter coolant is
unavailable.