2023 TOYOTA MIRAI horn

1484-4. Adjusting the steering wheel and mirrors
Owners Manual_USA_M62064_en
■Automatic adjustment of the
steering position (if equipped)
A desired steering position can be
entered to memory and recalled
automatically by the driving position
memory system. ( P.142)
■Power easy access system (if
equipped)
The steering wheel and driver’s seat
move in accordance with power
switch mode and the driver’s seat
belt condition. ( P.142)
■After adjusting the steering
wheel (manual adjustment type)
Make sure that the steering wheel is
securely locked.
The horn may not sound if the steer-
ing wheel is not securely locked.
■Customization
Some functions can be customized.
(  P.512)
Press on or close to the
mark.
WARNING
■Caution while driving
Do not adjust the steering wheel
while driving.
Doing so may cause the driver to
mishandle the vehicle and cause
an accident, resul ting in death or
serious injury.
■After adjusting the steering
wheel (manual adjustment
type)
Make sure that the steering wheel
is securely locked. Otherwise, the
steering wheel may move sud-
denly, possibly causing an acci-
dent, resulting in death or serious
injury.
Sounding the horn

2645-5. Using the driving support systems
Owners Manual_USA_M62064_en
■If “Parking Assist Unavailable”
is displayed on the multi-infor-
mation display
Water may be continuously flowing
over the sensor surface, such as in
a heavy rain. When the system
determines that it is normal, the sys-
tem will return to normal.
■Sensor detection information
●The sensor’s detection areas are
limited to the areas around the
vehicle’ front and rear bumpers.
●The following situations may occur
during use.
• Depending on the shape of the object and other factors, the
detection distance may shorten, or
detection may be impossible.
• Detection may be impossible if
static objects draw too close to the
sensor.
• There will be a short delay
between static object detection
and display (warning buzzer
sounds). Even at low speeds,
there is a possibilit y that the object
will come within 11.9 in. (30 cm)
before the display is shown and
the warning buzzer sounds.
• It might be difficult to hear the buzzer due to the volume of the
audio system or air flow noise of
the air conditioning system.
• It may be difficult to hear the
sound of this system due to the
buzzers of other systems.
■Objects which the system may
not be properly detected
The shape of the object may pre-
vent the sensor from detecting it.
Pay particular attention to the follow-
ing objects:
●Wires, fences, ropes, etc.
●Cotton, snow and other materials
that absorb sound waves
●Sharply-angled objects
●Low objects
●Tall objects with upper sections
projecting outwards in the direc- tion of your vehicle
■Situations in which the system
may not operate properly
Certain vehicle conditions and the
surrounding environment may affect
the ability of a sensor to correctly
detect objects. Part icular instances
where this may occur are listed
below.
●There is dirt, snow, water drops or
ice on a sensor. (Cleaning the
sensors will resolve this problem.)
●A sensor is froz en. (Thawing the
area will resolve this problem.)
In especially cold weather, if a
sensor is frozen the sensor dis-
play may be displayed abnormally,
or objects, such as a wall, may not
be detected.
●When a sensor or the area around
a sensor is extremely hot or cold.
●On an extremely bumpy road, on
an incline, on gravel, or on grass.
●When vehicle horns, vehicle
detectors, motorcycle engines, air
brakes of large vehicles, the clear-
ance sonar of ot her vehicles or
other devices which produce ultra-
sonic waves are near the vehicle
●A sensor is coated with a sheet of
spray or heavy rain.
●If objects draw too close to the
sensor.
●When a pedestrian is wearing
clothing that does not reflect ultra-
sonic waves (ex. skirts with gath-
ers or frills).
●When objects that are not perpen-
dicular to the ground, not perpen-
dicular to the vehicle traveling

2655-5. Using the driving support systems
Owners Manual_USA_M62064_en
5
Driving
direction, uneven, or waving are in
the detection range.
●Strong wind is blowing
●When driving in inclement weather
such as fog, snow or a sandstorm
●When an object that cannot be
detected is betw een the vehicle
and a detected object
●If an object such as a vehicle,
motorcycle, bicycle or pedestrian
cuts in front of the vehicle or runs
out from the side of the vehicle
●If the orientation of a sensor has
been changed due t o a collision or
other impact
●When equipment that may
obstruct a sensor is installed, such
as a towing eyelet, bumper pro-
tector (an additi onal trim strip,
etc.), bicycle carrier, or snow plow
●If the front of the vehicle is raised
or lowered due to the carried load
●If the vehicle cannot be driven in a
stable manner, such as when the
vehicle has been in an accident or
is malfunctioning
●When a tire chains, compact
spare tire or an emergency tire
puncture repair kit is used
■Situations in which the system
may operate even if there is no
possibility of a collision
In some situations, such as the fol-
lowing, the system may operate
even though there is no possibility of
a collision.
●When driving on a narrow road
●When driving toward a banner,
flag, low-hanging branch or boom barrier (such as those used at rail-
road crossings, toll gates and
parking lots)
●When there is a ru
t or hole in the
surface of the road
●When driving on a metal cover
(grating), such as those used for
drainage ditches
●When driving up or down a steep
slope
●If a sensor is hit by a large amount
of water, such as when driving on
a flooded road
●There is dirt, snow, water drops or
ice on a sensor. (Cleaning the
sensors will resolve this problem.)
●A sensor is coated with a sheet of
spray or heavy rain
●When driving in inclement weather
such as fog, snow or a sandstorm
●When strong winds are blowing
●When vehicle horns, vehicle
detectors, motorcycle engines, air
brakes of large vehicles, the clear-
ance sonar of ot her vehicles or
other devices which produce ultra-
sonic waves are near the vehicle
●If the front of the v ehicle is raised
or lowered due to the carried load
●If the orientation of a sensor has
been changed due to a collision or
other impact
●The vehicle is approaching a tall
or curved curb
●Driving close to columns (H-
shaped steel beams, etc.) in multi-
story parking garages, construc-
tion sites, etc.
●If the vehicle cannot be driven in a

4808-2. Steps to take in an emergency
Owners Manual_USA_M62064_en
One of the following may be the
cause of the problem:
The electronic key may not be
functioning properly.
( P.482)
 There may not be sufficient
fuel in the vehicle’s tank.
Refuel the vehicle.
 The fuel door may be open.
( P.212)
 There may be a malfunction
in the immobilizer system.
( P. 7 0 )
 There may be a malfunction
in the shift control system.
*
( P.183, 465)
 The fuel cell system may be
malfunctioning due to an elec-
trical problem such as elec-
tronic key battery depletion or
a blown fuse. However, depending on the type of mal-
function, an interim measure
is available to start the fuel
cell system. (
P.481)
 There is a possibility that the
temperature of the traction
battery is extremely low
(approximately below -22˚F [-
30˚C]). ( P.85, 180)
 It is possible the fuel cell sys-
tem is frozen. ( P.180)
*: It may not be possible to shift the
shift position from P.
One of the following may be the
cause of the problem:
 The 12-volt battery may be
discharged. ( P.485)
 The 12-volt battery terminal
connections may be loose or
corroded. ( P.413)
One of the following may be the
cause of the problem:
 One or both of the 12-volt bat-
tery terminals may be discon-
nected. ( P.413)
If the fuel cell system
will not start
Reasons for the fuel cell
system not starting vary
depending on the situation.
Check the following and
perform the appropriate
procedure:
The fuel cell system will
not start even though the
correct starting procedure
is being followed.
( P.180)
The interior lights and
headlights are dim, or the
horn does not sound or
sounds at a low volume.
The interior lights and
headlights do not turn on,
or the horn does not
sound.

Owners Manual_USA_M62064_en
541What to do if... (Troubleshooting)
Is the electronic key any-
where detectable inside the
vehicle? ( P.136)
 Is the electronic key battery
weak or depleted?
In this case, the fuel cell system
can be started in a temporary way.
( P.484)
 Is the 12-volt battery dis-
charged? ( P.485)
 Is the window lock switch
pressed?
The power window except for the
one at the driver’s seat cannot be
operated if the win dow lock switch
is pressed. ( P.164)
 The auto power off function
will be operated if the vehicle
is left in ACC for a period of
time. ( P.184)
 The seat belt reminder light is
flashing
Are the driver and the front passen-
ger wearing the seat belts?
( P.460)
 The parking brake indicator is
on
Is the parking br ake released?
(  P.191)
Depending on the situation,
other types of warning buzzer
may also sound. ( P.454, 464)
 Did anyone inside the vehicle
open a door during setting the
alarm?
The sensor detects it and the alarm
sounds. ( P. 7 1 )
Do one of the following to deac-
tivate or stop the alarms:
 Except for Canada: Unlock
the doors.
 Except for Canada: Unlock
the trunk using the mechani-
cal key.
 For Canada: Unlock the doors
or trunk using the entry func-
tion or wireless remote con-
trol.
 Turn the power switch to ACC
or ON, or start the fuel cell
system. (The alarm will be
deactivated or stopped after a
few seconds.)
The windows do not
open or close by operat-
ing the power window
switches
The power switch is
turned off a utomatically
A warning buzzer sounds
during driving
An alarm is activated and
the horn sounds

548Alphabetical Index
Owners Manual_USA_M62064_en
Fuel cell unit compartment cover ............................................... 409
Fuel consumption Average fuel economy ......... 107
Current fuel economy ........... 107
Fuel door ........................... ...... 210
Refueling .............................. 210
When the fuel door cannot be opened ............................... 482
Fuel economy ......... ................ 107
Fuel gauge ........................ 99, 102
Fuses ....................................... 438
G
Garage door opener ............... 382
Gauges .............................. 99, 102
Glove box ................................ 358
Glove box light ....................... 359
H
Head restraints ....................... 145
Head-up display ..................... 114 Driving information display area........................................... 114
Driving support system display area .................................... 117
Fuel cell System Indicator .... 118
HUD (Head-up display) switch ........................................... 116
Navigation system-linked display ........................................... 114
Outside temperature ............ 114
Pop-up display ..................... 117
Settings ................................ 116
Headlights Automatic High Beam .......... 200
Light switch .......................... 198
Replacing light bulbs ............ 443
Heated steering wheel ........... 351 Heaters
Automatic air conditioning sys-tem .............................333, 340
Heated steering wheel..........351
Outside rear view mirrors ...335, 342
Seat heaters ....... ..................351
High mounted stoplight Replacing light bulbs ............443
High-voltage components .......81
Hill-start assist control...........322
Hood ........................................406 Open.....................................406
Pop Up Hood ..........................43
Hooks Coat hooks ...........................372
Retaining hooks (floor mat) ....26
Horn .........................................148
HUD (Head-up display) switch ............................................... 116
Hydrogen detecto rs..................84
Hydrogen tanks ............76, 81, 83 Capacity ...............................497
Location ............................76, 81
Hydrogen-related components81
I
Identification Vehicle ..................................496
Ignition switch (power switch) ...............................................180
Immobilizer system ..................70
Indicators ..................................97
Initialization Electronic sunshade .............363
Items to initialize ...................526
Power windows ....................162
Tire pressure w arning system
...........................................420
Inside door handle lights .......355
Inside rear view m irror ...........149