2021 MAZDA MODEL 3 HATCHBACK ECU

▼Front Shoulder Belt Adjuster
The front seat belts have a front
shoulder belt adjuster. If the seat belt
contacts your neck or it slips o
ff the
shoulder, adjust the seat belt height.
To ra i s e
To heighten the seat belt, move the
front shoulder belt adjuster upward.
To l o w e r
To lower the seat belt, hold the front
shoulder belt adjuster and lower the
seat belt with the knob of the front
shoulder belt adjuster pressed.

After adjusting , press the front
shoulder belt adjuster downward and
make sure that it is securely locked.
Seat Belt Warning
Systems
▼Seat Belt Warning Systems
If it detects that the occupant seat belt
is unfastened, the warning light or
beep alerts the occupant.
Refer to Seat Belt Warning Indication/
Warning Light (Front seat) on page
7-36.
Refer to Seat Belt Warning Light (Rear
seat) (Red) on page 7-36.
Refer to Seat Belt Warning Beep on
page 7-42.

Seat belt indicator light (rear seat)
(green)
The light turns on when the rear seat
belt is fastened while the ignition is
switched ON, and it turns o
ff after a
certain period.
Essential Safety Equipment
Seat Belt Systems
2-27
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Child-RestraintPrecautions
▼ Child-Restraint Precautions
Mazda strongly urges the use of
child-restraint systems for children
small enough to use them.

You are required by law to use a
child-restraint system for children in
the U.S. and Canada.
Check your local and state or
provincial laws for speci
fic
requirements regarding the safety of
children riding in your vehicle.

Whatever child-restraint system you
consider, please pick the appropriate
one for the age and size of the child,
obey the law and follow the
instructions that come with the
individual child-restraint system.

A child who has outgrown
child-restraint systems should sit in the
rear and use seat belts, both lap and
shoulder. If the shoulder belt crosses
the neck or face, move the child closer
to the center of the vehicle in the
outboard seats, and towards the
buckle on the right if the child is seated
on the center seat.

Statistics con firm that the rear seat is
the best place for all children up to 12
years of age, and more so with a
supplemental restraint system (air
bags).

A rear-facing child-restraint system
should NEVER be used on the front
seat with the air bag system activated.
The front passenger's seat is also the
least preferred seat for other
child-restraint systems.

(With Front Passenger Occupant
Classi fication System)
To reduce the chance of injuries
caused by deployment of the front
passenger air bag, the front passenger
seat weight sensors occupant
classi fication sensor works as a part of
the supplemental restraint system. This
system deactivates the front passenger
front and side air bags and knee air
bags, and also the front passenger seat
belt pretensioner system when the
front passenger air bag deactivation
indicator light illuminates.

When an infant or small child sits on
the front passenger seat, the system
shuts o ff the front passenger front and
side air bags and knee air bags, and
seat belt pretensioner system, so make
sure the front passenger air bag
deactivation indicator light illuminates.

Even if the front passenger air bag is
shut o ff, Mazda strongly recommends
that children be properly restrained
and child-restraint systems of all kinds
are properly secured on the rear seats
which are the best place for children.

For more details, refer to "Front
passenger seat weight sensors" (page
2-71).

Essential Safety Equipment
Child Restraint
2-32
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

WARNING
Use the correct size child-restraint
system:
For eff ective protection in vehicle
accidents and sudden stops, a child
must be properly restrained using a
seat belt or child-restraint system
depending on age and size. If not, the
child could be seriously injured or even
killed in an accident.
Follow the manufacturer's
instructions and always keep the
child-restraint system buckled down:
An unsecured child-restraint system is
dangerous. In a sudden stop or a
collision it could move causing serious
injury or death to the child or other
occupants. Make sure any
child-restraint system is properly
secured in place according to the
child-restraint system manufacturer's
instructions. When not in use, remove
it from the vehicle or fasten it with a
seat belt, or attach it to BOTH ISOFIX/
LATCH
*1 lower anchors for ISOFIX/
LATCH*1 child-restraint systems and
the corresponding tether anchor.
*1 ISOFIX (Mexico)/LATCH (Except Mexico)
Always secure a child in a proper
child-restraint system:
Holding a child in your arms while the
vehicle is moving is extremely
dangerous. No matter how strong the
person may be, he or she cannot hold
onto a child in a sudden stop or
collision and it could result in serious
injury or death to the child or other
occupants. Even in a moderate
accident, the child may be exposed to
air bag forces that could result in
serious injury or death to the child, or
the child may be slammed into an
adult, causing injury to both child and
adult.
Never use a rear-facing child-restraint
system in the front seat with an air
bag that could deploy:
Rear-facing child-restraint systems on
the front seat are particularly
dangerous even though you may feel
assured that a front passenger air bag
will not deploy based on the fact that
the front passenger air bag
deactivation indicator light illuminates.
The child-restraint system can be hit by
a deploying air bag and moved
violently backward resulting in serious
injury or death to the child.
Essential Safety Equipment
Child Restraint
2-33
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

NOTE
Your Mazda is equipped with ISOFIX/
LATCH*1 lower anchors for attachment
of specially designed ISOFIX/LATCH*1
child-restraint systems on the rear
seats. When using these anchors to
secure a child-restraint system, refer to
"Using ISOFIX Lower Anchor
(Mexico)/Using LATCH Lower Anchor
(Except Mexico)" (page 2-50).
*1 ISOFIX (Mexico)/LATCH (Except Mexico)
Essential Safety Equipment
Child Restraint
2-36
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Child-Restraint System Suitability for Various SeatPo s i t i o n s Ta b l e
▼Child-Restraint System Suitability
for Various Seat Positions Table
(Mexico)
Provided information in the table shows your child-restraint system suitability for
various seating position. For installation suitability of other manufacturer
child-restraint system, carefully consult the manufacturer's instructions which
accompany the child-restraint system.
When installing a child-re straint system, the following points must be observed:
Always remove the head restraint before installing a child-restraint system.
However, when installing a backless booster seat, always install the vehicle head
restraint to the seat where the backless b ooster seat is installed. In addition,
always use a tether strap and attach it securely. Refer to Head Restraints on page
2-17.
When installing a child-restraint system to the front passenger seat, adjust the seat
slide position as far back as possible.
Refer to Adjusting the Front Passenger's Seat on page 2-13.
When it is di fficult to install a child-restraint sy stem to the front passenger seat, or
the seat belt cannot be secured to th e child-restraint system, perform the
following operations to adjust the seat ho lding the child-restraint system so that
the seat belt can be secured completely to it.
Move the seat forward or back.Move the seatback forward or back.Move the seat upward or downward. (Veh icles with height adjustment function)When installing a child-restraint system to the rear seat, adjust the front seat
position so that the front seat does not contact the child-restraint system.
Refer to Adjusting the Driver's Seat on page 2-5.
Refer to Adjusting the Front Passenger's Seat on page 2-13.
When installing a child-restraint system equipped with a tether, remove the head
restraint.
Refer to Head Restraints on page 2-17.
An i-Size child-restraint system refers to a child-restraint system which has
acquired i-Size category certi fication for the UN-R 129 regulation.
Essential Safety Equipment
Child Restraint
2-39
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Seating position Passenger Rear (Left) Rear (Center) Rear (Right)
Non i-size compat-
ible with a support
leg (Yes/No) Ye s
*1Ye s
N oYe s
Lower ISOFIX an-
chorages but with-
out Top Tether
(Yes/No) No
NoNo No
U = Suitable for “universal” category restraints approved for use in this mass group.
UF = Suitable for forward-facing “universal” category restraints approved for use in this mass group.
IUF = Suitable for ISOFIX forward child restraints systems of universal category approved for use in the
mass group.
L = Suitable for particular child restraints given on attached list. These restraints may be of the
“s p e c ific
vehicle”, “restricted” or “semi-universal” categories.
IL = Suitable for particular ISOFIX child restraint syst ems (CRS) given in the attached list. These ISOFIX CRS
are those of the “speci fic vehicle”, “restricted” or “semi-universal” categories.
i-U = Suitable for i-Size “universal” Child Restraint Systems forward and rearward facing.
i-UF = Suitable for forward-facing i-Size “universal” Child Restraint Systems only.
Yes = Child-restraint system can be secured on the seat.
No = Child-restraint system cannot be secured on the seat, or there is no fixture.
X = Child-restraint system cannot be installed.
*1 Child restraint system can only be installed in the forward-facing position.
A Mazda genuine child-restraint system can be installed. Regarding child-restraint systems which can be
installed, refer to the accessories catalog.
(Except Mexico)
Regarding child-restraint syst ems which can be installed to your Mazda, consult an
Authorized Mazda Dealer.
A child-restraint system with a support le g cannot be installed on the rear center
seat position.
Please comply with the legal regulations concerning the use of child-restraint
systems in your country.
For the CRS which do not carry the ISO/XX size class identi fication (A to G), for
the applicable mass group, the child seat manufacturer shall indicate the vehicle
specific LATCH child-restraint systems recommended for each position.
Essential Safety Equipment
Child Restraint
2-41
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Installing Child-RestraintSystems
▼Installing Child-Restraint Systems
Accident statistics reveal that a child is
safer in the rear seat. The front
passenger's seat is clearly the worst
choice for any child under 12, and
with rear-facing child-restraint systems
it is clearly unsafe due to air bags.

NOTE
Even if your vehicle is equipped with
front passenger occupant classi
fication
sensor (page 2-71), which
automatically deactivates the front
passenger air bag , a rear seat is the
safest place for a child of any age or
size.

Some child-restraint systems now
come with tethers and therefore must
be installed on the seats that take
tethers to be e ffective. In your Mazda,
tethered child-restraint systems can
only be accommodated in the three
positions on the rear seat.

Some child-restraint systems also
employ specially designed ISOFIX/
LATCH
*1 attachments; refer to "Using
ISOFIX Lower Anchor (Mexico)/Using
LATCH Lower Anchor (Except
Mexico)" (page 2-50).
*1 ISOFIX (Mexico)/LATCH (Except Mexico)
WARNING
Tethered Child-Restraint Systems
Work Only on Tether-Equipped Rear
Seats:
Installation of a tether equipped
child-restraint system in the front
passenger's seat defeats the safety
design of the system and will result in
an increased chance of serious injury if
the child-restraint system goes forward
without benefit of being tethered.
Place tether equipped child-restraint
systems where there are tether
anchors.
▼ Anchor Bracket
Anchor brackets for securing
child-restraint systems are equipped in
the vehicle. Locate each anchor
position using the illustration.
To install a child-restraint system,
remove the head restraint. Always
follow the instruction manual
accompanying the child-restraint
system.

Anchor bracket location
Use the indicated anchor bracket
locations when installing a
child-restraint system equipped with a
tether.
(4–Door)
1. For right
2. For center (Except Mexico)
3. For left
Essential Safety Equipment
Child Restraint
2-42
Mazda3_8JM2-EA
-20H_Edition1_new 2020-7-10 17:21:34

(5–Door)
1. Tether strap
2. Anchor bracket
3. Forward

Always install the head restraint and
adjust it to the appropriate position
after removing the child-restraint
system:
Driving with the head restraint
removed is dangerous as impact to the
occupant's head cannot be prevented
during emergency braking or in a
collision, which could result in a
serious accident, injury or death.
Refer to Head Restraints on page 2-17.
▼Using Automatic Locking Mode
(Except Mexico)
Follow these instructions when using a
child-restraint system, unless you are
attaching a LATCH
-equipped
child-restraint system to the rear
LATCH lower anchors. Refer to “Using
LATCH Lower Anchor” (page 2-50).
NOTE
Follow the child-restraint system
manufacturer's instructions carefully. If
you are not sure whether you have a
LATCH system or tether, check in the
child-restraint system manufacturer's
instructions and follow them
accordingly. Depending on the type of
child-restraint system, it may use
LATCH system instead of seat belts or if
the belt goes across the child's chest,
may recommend against using
automatic locking mode.
1. Make sure the seatback is securely latched by pushing it back until it is
fully locked.
2. Remove the head restraint. However, when installing a backless
booster seat, always install the
vehicle head restraint to the seat
where the backless booster seat is
installed.
Refer to Head Restraints on page
2-17.
3. Secure the child-restraint system with the lap portion of the lap/
shoulder belt. See the
manufacturer's instructions on the
child-restraint system for belt
routing instructions.
Essential Safety Equipment
Child Restraint
2-44
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34