ECU TOYOTA MIRAI 2023 User Guide

361-1. For safe use
Owners Manual_USA_M62064_en
Front passenger’s seat belt buckle switch
Front passenger occupant classification system (ECU and sen-
sors)
“AIRBAG ON” and “AIRBAG OFF” indicator lights
Your vehicle is equipped with ADVANCED AIRBAGS designed
based on the US motor vehicle safety standards (FMVSS208). The
airbag sensor assembly (ECU) cont rols airbag deployment based on
information obtained from the sensors etc. shown in the system
components diagram above. This in formation includes crash sever-
ity and occupant information. As the airbags deploy, a chemical
reaction in the inflators quickly fills the airbags with non-toxic gas to
help restrain the motion of the occupants.
■If the SRS airbags deploy
(inflate)
●Slight abrasions, burns, bruising,
etc., may be sustained from SRS
airbags, due to the extremely high
speed deployment (inflation) by
hot gases.
●A loud noise and white powder will
be emitted.
●Parts of the airbag module (steer-
ing wheel hub, airbag cover and
inflator) as well as the front seats,
parts of the front and rear pillars,
and roof side rails, may be hot for
several minutes. T he airbag itself
may also be hot.
●The windshield may crack.
●The fuel cell system will be
stopped and hydr ogen supply will
be stopped fro m the hydrogen
tank valves. ( P. 8 9 )
●All of the doors will be unlocked.
( P.128)
●The brakes and st op lights will be
controlled automatically. ( P.323)
●The interior lights will turn on auto-
matically. ( P.357)
●The emergency flashers will turn
on automatically. ( P.446)
●For Safety Connect subscribers, if any of the following situations
occur, the system is designed to
send an emergency call to the
response center, notifying them of
the vehicle’s location (without
needing to push the “SOS” button)
and an agent will attempt to speak
with the occupants to ascertain
the level of emergency and assis-
tance required. If the occupants
are unable to communicate, the
agent automatically treats the call
as an emergency and helps to dis-
patch the necessary emergency
services. (
P. 6 5 )
• An SRS airbag is deployed.
• A seat belt pretensioner is acti- vated.
• The vehicle is involved in a severe rear-end collision.
■SRS airbag deployment condi-
tions (SRS front airbags)
●The SRS front airbags will deploy
in the event of an impact that
exceeds the set threshold level
(the level of forc e corresponding
to an approximately 12 - 18 mph
[20 - 30 km/h] frontal collision with
a fixed wall that does not move or
deform).
However, this threshold velocity will
be considerably higher in the follow-
ing situations:

371-1. For safe use
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For safety and security
• If the vehicle strikes an object, such as a parked vehicle or sign
pole, which can move or deform
on impact
• If the vehicle is involved in an underride collision, such as a colli-
sion in which the front of the vehi-
cle underrides, or goes under, the
bed of a truck
●Depending on the type of collision,
it is possible that only the seat belt
pretensioners will activate.
●The SRS front airbags for the front
passenger will not activate if there
is no passenger sitting in the front
passenger seat. However, the
SRS front airbags for the front
passenger may de ploy if luggage
is put in the seat, even if the seat
is unoccupied.
■SRS airbag deployment condi-
tions (SRS side and curtain
shield airbags)
●The SRS side and curtain shield
airbags will deploy i n the event of
an impact that exceeds the set
threshold level (the level of force
corresponding to the impact force
produced by an approximately
3300 lb. [1500 kg] vehicle colliding
with the vehicle cabin from a
direction perpendicular to the
vehicle orientation at an approxi-
mate speed of 12 - 18 mph [20 -
30 km/h]).
●Both SRS curtain shield airbags
may deploy in the event of a
severe side collision.
●Both SRS curtain shield airbags
will deploy in the event of vehicle
rollover.
●Both SRS curtain shield airbags
may also deploy in the event of a
severe frontal collision.
■Conditions under which the
SRS airbags may deploy
(inflate), other t han a collision
The SRS front airbags and SRS
side and curtain shield airbags may
also deploy if a serious impact occurs to the underside of your vehi-
cle. Some examples are shown in
the illustration.
●Hitting a curb, edge of pavement
or hard surface
●Falling into or jumping over a deep
hole
●Landing hard or falling
The SRS curtain shield airbags may
also deploy under the situations
shown in the illustration.
●The angle of vehicle tip-up is mar-
ginal.
●The vehicle skids and hits a curb
stone.
■Types of collisions that may not
deploy the SRS airbags (SRS
front airbags)
The SRS front airbags do not gener-
ally inflate if the vehicle is involved
in a side or r ear collision, if it rolls
over, or if it is involved in a low-
speed frontal collision. But, when-
ever a collision o f any type causes
sufficient forward deceleration of the
vehicle, deploym ent of the SRS
front airbags may occur.
●Collision from the side
●Collision from the rear
●Vehicle rollover

391-1. For safe use
Owners Manual_USA_M62064_en
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For safety and security
●The pad section of the steering
wheel, dashboard near the front
passenger airbag o r lower portion
of the instrument panel is
scratched, cracked, or otherwise
damaged.
●The surface of the seats with the
side airbag is scratched, cracked,
or otherwise damaged.
●The portion of the front pillars, rear
pillars or roof side rail garnishes
(padding) containing the SRS cur-
tain shield airbags inside is
scratched, cracked, or otherwise
damaged.
WARNING
■SRS airbag precautions
Observe the following precautions
regarding the SRS airbags.
Failure to do so may cause death
or serious injury.
●The driver and all passengers in
the vehicle must wear their seat
belts properly.
The SRS airbags are supple-
mental devices to be used with
the seat belts.
●The SRS driver airbag deploys
with considerable force, and
can cause death or serious
injury especially if the driver is
very close to the airbag.
The National Highway Traffic
Safety Administr ation (NHTSA)
advises: Since the risk zone for
the driver’s airbag is the first 2 - 3
in. (50 - 75 mm) of inflation, plac-
ing yourself 10 in. (250 mm) from
your driver airbag provides you
with a clear margin of safety. This
distance is measured from the
center of the steering wheel to
your breastbone. If you sit less
than 10 in. (250 mm) away now,
you can change you r driving posi-
tion in several ways:
• Move your seat to the rear as far as you can while still reach-
ing the pedals comfortably.

411-1. For safe use
Owners Manual_USA_M62064_en
1
For safety and security
WARNING
●Do not sit on the edge of the
seat or lean against the dash-
board.
●Do not allow a child to stand in
front of the SRS front passenger
airbag unit or sit on the knees of
a front passenger.
●Do not allow the front seat occu-
pants to hold items on their
knees.
●Do not lean against the door,
the roof side rail or the front,
side and rear pillars.
●Do not allow anyone to kneel on
the passenger seats toward the
door or put their head or hands
outside the vehicle.
●Do not attach anything to or
lean anything against areas
such as the dashboard, steering
wheel pad and lower portion of
the instrument panel.
These items can become pro-
jectiles when th e SRS driver,
front passenger and knee air-
bags deploy.
●Do not attach anything to areas
such as a door, windshield, side
windows, front or rear pillar, roof
side rail and assist grip. (Except
for the speed limit label
 P.472)

431-1. For safe use
Owners Manual_USA_M62064_en
1
For safety and security
Sensors
Hood
Lifters
WARNING
●Installation of electronic devices
such as mobile two-way radios
and CD players
●Modifications to your vehicle for
a person with a physical disabil-
ity
Pop Up Hood
In the event of a frontal col-
lision with a body, such as a
pedestrian, the Pop Up
Hood system raises the
hood to reduce the possibil-
ity of a serious impact to the
pedestrian’s head area by
adding clearance to the fuel
cell unit compartment.
When the sensors located
at the back of the front
bumper detect a frontal
impact with a body, such as
a pedestrian, which meets
or exceeds the threshold
level while the vehicle is
being driven within the
operational speed range,
the system operates.
System components

451-1. For safe use
Owners Manual_USA_M62064_en
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For safety and security
WARNING
●If the Pop Up Hood has oper-
ated, have it replaced by your
Toyota dealer. If the Pop Up
Hood has operated, stop the
vehicle in a safe place and con-
tact your Toyota dealer.
●Do not touch the lifters immedi-
ately after the Pop Up Hood has
operated, as the lifters may be
hot and burn you.
NOTICE
■Pop Up Hood precautions
●Make sure to close the hood
before driving, as the system
may not operate properly if the
hood is not fully closed.
●Make sure that all 4 tires are of
the specified size and inflated to
the specified tire pressure. If
tires of a different size are used,
the system may not operate
properly.
●If something has hit the area
around the front bumper, the
sensors may be damaged even
if the Pop Up Hood has not
operated. Have the vehicle
inspected by your Toyota
dealer.
●Do not remove or repair the
parts or wiring of the Pop Up
Hood, as doing so may cause
accidental operation or prevent
the system from operating prop-
erly. If repair or replacement is
necessary, contact your Toyota
dealer.
●Do not remove such compo-
nents as the front bumper, hood
or suspension, or replace them
with non-genuine parts, as
doing so may prevent the sys-
tem from operating properly.
●Do not install anything to the
front bumper or hood, as doing
so may prevent the sensors
from detecting an impact cor-
rectly and prevent the system
from operating properly.
●Do not close the hood with force
or apply load to the lifters, as
doing so may damage the lifters
and prevent the system from
operating properly.
●Do not modify the suspension,
as changes made to the vehicle
height may prevent the system
from operating properly.

471-1. For safe use
Owners Manual_USA_M62064_en
1
For safety and security
WARNING
●Make sure the “AIRBAG OFF”
indicator light is not illuminated
when using the seat belt
extender for the front passenger
seat. If the “AIRBAG OFF” indi-
cator light is illuminated, discon-
nect the extender tongue from
the seat belt buckle, and recon-
nect the seat belt. Reconnect
the seat belt extender after
making sure the “AIRBAG ON”
indicator light is illuminated. If
you use the seat belt extender
while the “AIRBAG OFF” indica-
tor light is illum inated, the SRS
airbags for the front passenger
will not activate, which could
cause death or ser ious injury in
the event of a collision.
●Do not apply a heavy load to the
front passenger seat or equip-
ment (e.g. seatback pocket).
●Do not put weight on the front
passenger seat by putting your
hands or feet on the front pas-
senger seat seatback from the
rear passenger seat.
●Do not let a rea r passenger lift
the front passenger seat with
their feet or press on the seat-
back with their legs.
●Do not put objects under the
front passenger seat.
●Do not recline t he front passen-
ger seatback so far that it
touches a rear seat. This may
cause the “AIRBAG OFF” indi-
cator light to be illuminated,
which indicates that the SRS
airbags for the front passenger
will not activate in the event of a
severe accident. If the seatback
touches the rear seat, return the
seatback to a position where it
does not touch the rear seat.
Keep the front passenger seat-
back as upright as possible
when the vehicle is moving.
Reclining the seatback exces-
sively may lessen the effective-
ness of the seat belt system.
●If an adult sits i n the front pas-
senger seat, the “AIRBAG ON”
indicator light i s illuminated. If
the “AIRBAG OFF” indicator is
illuminated, ask the passenger
to sit up straight, well back in
the seat, feet on the floor, and
with the seat belt worn correctly.
If the “AIRBAG OFF” indicator
still remains illumi nated, either
ask the passenger to move to
the rear seat, or if that is not
possible, move the front pas-
senger seat fully rearward.
●When it is unavoidable to install
a forward-facing child restraint
system on the front passenger
seat, install the child restraint
system on the front passenger
seat in the proper order.
(  P. 5 4 )
●Do not modify or remove the
front seats.
●Do not kick the front passenger
seat or subject it to severe
impact. Otherwise, the SRS
warning light m ay come on to
indicate a malfu nction of the
front passenger occupant clas-
sification system. In this case,
contact your Toyota dealer
immediately.

491-1. For safe use
Owners Manual_USA_M62064_en
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For safety and security
■Child restraint system with infant*5
■Unoccupied
■There is a malfunction in the system
*1: The system judges a person of adult size as an adult. When a smaller
adult sits in the front passenger seat, the system may not recognize
him/her as an adult depending on his/her physique and posture.
*2: In the event the front passenger is wearing a seat belt
*3: In the event the front passen ger does not wear a seat belt
*4: For some children, child in seat, child in booster seat or chi ld in convert-
ible seat, the system may not recognize him/her as a child. Fac tors
which may affect this can be the physique or posture.
Indicator/warning light
“AIRBAG ON” and “AIRBAG OFF” indicator lights“AIRBAG OFF”*6
SRS warning lightOff
Driver’s and front passenger’s seat belt reminder lightOff*2 or flashing*3
DevicesFront passenger airbagDeactivatedFront passenger knee airbag
Indicator/warning light
“AIRBAG ON” and “AIRBAG OFF” indicator lights“AIRBAG OFF”
SRS warning light
OffDriver’s and front passenger’s seat belt reminder light
DevicesFront passenger airbagDeactivatedFront passenger knee airbag
Indicator/warning light
“AIRBAG ON” and “AIRBAG OFF” indicator lights“AIRBAG OFF”
SRS warning lightOn
Driver’s and front passenger’s seat belt reminder lightOff
DevicesFront passenger airbagDeactivatedFront passenger knee airbag

511-2. Child safety
Owners Manual_USA_M62064_en
1
For safety and security
1-2.Child safety
Riding with children
Observe the following pre-
cautions when children are
in the vehicle.
Use a child restraint system
appropriate for the child,
until the child becomes
large enough to properly
wear the vehicle’s seat belt.
 It is recommended that chil-
dren sit in the rear seats to
avoid accidental contact
with the shift lever, wiper
switch, etc.
Use the rear door child-pro-
tector lock or the window
lock switch to avoid children
opening the door while driv-
ing or operating the power
window accidentally.
( P.130, 164)
Do not let small children
operate equipment which
may catch or pinch body
parts, such as the power
window, hood, trunk, seats,
etc.
WARNING
■When children are in the vehi-
cle
Never leave children unattended
in the vehicle, and never allow
children to have or use the key.
Children may be able to start the
vehicle or shift the vehicle into
neutral. There is also a danger
that children ma y injure them-
selves by playing with the win-
dows or other features of the
vehicle. In addition, heat build-up
or extremely cold temperatures
inside the vehicle can be fatal to
children.

531-2. Child safety
Owners Manual_USA_M62064_en
1
For safety and security
WARNING
●Toyota strongly urges the use of
a proper child restraint system
that conforms to the weight and
size of the child, installed on the
rear seat. According to accident
statistics, the child is safer when
properly restrained in the rear
seat than in the front seat.
●Holding a child in your or some-
one else’s arms is not a substi-
tute for a child restraint system.
In an accident, the child can be
crushed against the windshield
or between the holder and the
interior of the vehicle.
■Handling the child restraint
system
If the child restraint system is not
properly fixed in place, the child or
other passengers may be seri-
ously injured or even killed in the
event of sudden braking, sudden
swerving, or an accident.
●If the vehicle were to receive a
strong impact from an accident,
etc., it is possib le that the child
restraint system has damage
that is not readily visible. In
such cases, do not reuse the
restraint system.
●Make sure you have complied
with all installation instructions
provided with the child restraint
system manufacturer and that
the system is properly secured.
●Keep the child restraint system
properly secured on the seat
even if it is not in use. Do not
store the child restraint system
unsecured in the passenger
compartment.
●If it is necessa ry to detach the
child restraint system, remove it
from the vehicle or store it
securely in the trunk.