2018 MAZDA MODEL 3 HATCHBACK ECU

Using the electric trunk lid opener
(With the advanced keyless function)
A trunk lid can also be opened while the
key is being carried.
Press the electric trunk lid opener on the
trunk lid, then raise the trunk lid when the
latch releases.

Electric trunk lid
opener
NOTE
When opening the trunk lid with the
doors locked, it may require a few
seconds for the trunk lid latch to release
after the electric trunk lid opener is
pressed.
The trunk lid can be closed when the
doors are locked with the key left in the
vehicle. However, to prevent locking the
key in the vehicle, the trunk lid can be
opened by pressing the electric trunk lid
opener. If the trunk lid cannot be opened
despite doing this procedure, press the
electric trunk lid opener to fully open
the trunk lid after pushing the trunk lid
completely closed.
If the vehicle battery is dead or there is
a malfunction in the electrical system
and the trunk lid cannot be unlocked,
the trunk lid can be opened by
performing the emergency procedure.
Refer to When Liftgate/Trunk Lid
Cannot be Opened on page 7-43.
Closing the liftgate/trunk lid
Lower the liftgate/trunk lid slowly using
the liftgate/trunk lid grip recess, then push
the liftgate/trunk lid closed using both
hands.
Do not slam it. Pull up on the liftgate/
trunk lid to make sure it is secure.
(5–door)

Liftgate grip
recess
(4–door)

Trunk lid grip recess
Before Driving
Doors and Locks
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▼Luggage Compartment
Luggage compartment cover (5-door)
WA R N I N G
Do not place anything on top of the cover:
Placing luggage or other cargo on top of
the luggage compartment cover is
dangerous. During sudden braking or a
collision, the cargo could become a
projectile that could hit and injure
someone. The vehicle has a light weight
luggage compartment cover to keep the
contents of your luggage area out of sight;
it will not retain heavy objects that are not
tied down in an accident such as a rollover.
Tie down all heavy objects, whether
luggage or cargo, using the tie down
hooks.
Make sure luggage and cargo are secured
before driving:
Not securing cargo while driving is
dangerous as it could move or be crushed
during sudden braking or a collision and
cause injury.
CAUTION

Make sure the luggage compartment
cover is firmly secured. If it is not firmly
secured, it could unexpectedly disengage
resulting in injury.
The luggage compartment can be accessed
by opening the liftgate when the straps are
attached to the sides of the liftgate.

Strap
Removing the cover
This cover can be re moved for more room.
1. Remove the straps from the hooks.
2. Lift the end of the luggage compartment cover a little, pull it
outward, and remove it from the pins.
Pin
Pin
3. Lift the front end of the luggagecompartment cover and remove it.
Before Driving
Doors and Locks
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Fuel-Filler Lid and Cap
WA R N I N G
When removing the fuel-filler cap, loosen
the cap slightly and wait for any hissing to
stop, then remove it:
Fuel spray is dangerous. Fuel can burn skin
and eyes and cause illness if ingested. Fuel
spray is released when there is pressure in
the fuel tank and the fuel-filler cap is
removed too quickly.
Before refueling, stop the engine, and
always keep sparks and flames away from
the filler neck:
Fuel vapor is dangerous. It could be ignited
by sparks or flames causing serious burns
and injuries.
Additionally, use of the incorrect fuel-filler
cap or not using a fuel-filler cap may result
in a fuel leak, which could result in serious
burns or death in an accident.
Do not continue refueling after the fuel
pump nozzle shuts off automatically:
Continuing to add fuel after the fuel pump
nozzle has shut off automatically is
dangerous because overfilling the fuel tank
may cause fuel overflow or leakage. Fuel
overflow and leakage could damage the
vehicle and if the fuel ignites it could cause
a fire and explosion resulting in serious
injury or death.
CAUTION
(U.S.A. and Canada)
Always use only a genuine Mazda fuel-filler
cap or an approved eq uivalent, available at
an Authorized Mazda Dealer. The wrong
cap can result in a serious malfunction of
the fuel and emission control systems. It
may also cause the check engine light in
the instrument cluster to illuminate.
▼ Fuel-Filler Lid
To open, pull the re
mote fuel-filler lid
release.
To close, press the fuel-filler lid until it
locks securely.
Remote fuel-filler
lid release
Before Driving
Fuel and Emission
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Modification and Add-OnEquipment
Mazda cannot guarantee the immobilizer
and the theft-deterrent systems' operation
if the system has been modified or if any
add-on equipment has been installed.
CAUTION
To avoid damage to the vehicle, do not
modify the system or install any add-on
equipment to the immobilizer and the
theft-deterrent systems or the vehicle.
Immobilizer System
The immobilizer syste m allows the engine
to start only with a key the system
recognizes.

If someone attempts to start the engine
with an unrecognized key, the engine will
not start, thereby helping to prevent
vehicle theft.
If you have a problem with the
immobilizer system or the key, consult an
Authorized Mazda Dealer.
CAUTION
 Radio equipment like this is governed by
laws in the United States.
Changes or
modifications not expressly
approved by the party responsible for
compliance could void the user's
authority to operate the equipment.
 To avoid damage to the key, do not:
 Drop the key.
 Get the key wet.
 Expose the key to any kind of magnetic
field.
 Expose the key to high temperatures
on places such as the dashboard or
hood, under direct sunlight.
 If the engine does not start with the
correct key, and the security indicator
light keeps illuminating or flashing, the
system may have a malfunction. Consult
an Authorized Mazda Dealer.
Before Driving
Security System
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NOTE
The keys carry a unique electronic code.
For this reason, and to assure your
safety, obtaining a replacement key
requires some waiting time. They are
only available through an Authorized
Mazda Dealer.
Always keep a spare key in case one is
lost. If a key is lost, consult an
Authorized Mazda Dealer as soon as
possible.
If you lose a key, an Authorized Mazda
Dealer will reset the electronic codes of
your remaining keys and immobilizer
system. Bring all the remaining keys to
an Authorized Mazda Dealer to reset.
Starting the vehicle with a key that has
not been reset is not possible.
▼Operation
NOTE
The engine may not start and security
indicator light may illuminate or flash if
the key is placed in an area where it is
difficult for the system to detect the
signal, such as on the dashboard or in
the glove compartment. Move the key to
a location within
the signal range,
switch the ignition off, and then restart
the engine.
Signals from a TV or radio station, or
from a transceiver or mobile telephone
could interfere with your immobilizer
system. If you are using the proper key
and the engine fails to start, check the
security indicator light.
Arming
The system is armed when the ignition is
switched from ON to off.
The security indicator light in the
instrument cluster fla shes every 2 seconds
until the system is disarmed.

Disarming
The system is disarmed when the ignition
is switched ON with the correct
programmed key. The security indicator
light illuminates for about 3 seconds and
then turns off. If the engine does not start
with the correct key, and the security
indicator light remains illuminated or
flashing, try the following:
Make sure the key is within the
operational range for signal transmission.
Switch the ignition off, and then restart the
engine. If the engine d oes not start after 3
or more tries, contact an Authorized
Mazda Dealer.
NOTE
If the security indicator light flashes
continuously while you are driving, do
not shut off the engine. Go to an
Authorized Mazda Dealer and have it
checked. If the engine is shut off while
the indicator light is flashing, you will
not be able to restart it.
Because the electronic codes are reset
when the immobilizer system is repaired,
the keys are needed. Make sure to bring
all the keys to an Authorized Mazda
Dealer so that they can be programmed.
Before Driving
Security System
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Theft-Deterrent System*
If the theft-deterrent system detects an
inappropriate entry in to the vehicle, which
could result in the veh icle or its contents
being stolen, the alarm alerts the
surrounding area of an abnormality by
sounding the horn and flashing the hazard
warning lights.

The system will not function unless it's
properly armed. So when you leave the
vehicle, follow the arming procedure
correctly.
▼ Operation
System triggering conditions
The horn sounds intermittently and the
hazard warning lights flash for about 30
seconds when the system is triggered by
any one of the following:
Unlocking a door with the auxiliary key,
door lock switch, or an inside door-lock
knob.
Forcing open a door, the hood or the
liftgate/trunk lid.
Opening the hood by operating the hood
release handle.
Switching the ignition ON without using
the push button start.
If the system is triggered again, the lights
and horn will activat e until the driver's
door is unlocked wit h the transmitter.
(With the advanced keyless function)
The lights and horn can also be
deactivated by pressing the request switch
on a door.
NOTE
If the battery goes dead while the
theft-deterrent system is armed, the horn
will activate and the hazard warning
lights will flash when the battery is
charged or replaced.
▼ How to Arm the System
1. Close the windows and the moonroof*
securely.
2. Switch the ignition OFF.
3. Make sure the hood, the doors, and the liftgate/trunk lid are closed.
4. Press the lock button on the transmitter or lock the driver's door from the
outside with the auxiliary key.
The hazard warning lights will flash
once.
The following method will also arm
the theft-deterrent system:
Press the door-lock switch “
” while
any door is open and then close all of
the doors.
(With the advanced keyless function)
Press a request switch.

The security indicator light in the
instrument cluster flashes twice per
second for 20 seconds.
5. After 20 seconds, the system is fully
armed.
Before Driving
Security System
*Some models.3-43
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NOTE
The theft-deterrent system can also be
armed by activating the auto relock
function with all the doors, the liftgate/
trunk lid and the hood closed.
Refer to Transmitter on page 3-4.
The system will disarm if one of the
following operations takes place within
20 seconds after pressing the lock
button:
Unlocking any door.
Opening any door.
Opening the hood.
Switching the ignition ON.
To rearm the system, do the arming
procedure again.
When the doors are locked by pressing
the lock button on the transmitter or
using the auxiliary key while the
theft-deterrent system is armed, the
hazard warning lights will flash once to
indicate that the system is armed.
▼ To Turn Off an Armed System
An armed system can be turned off using
any one of the following methods:
Pressing the unlock button on the
transmitter.
Starting the engine w
ith the push button
start.
(With the advanced keyless function)
Pressing a request switch on the
doors.
The hazard warning ligh ts will flash twice.
NOTE
When the doors are unlocked by pressing
the unlock button on the transmitter while
the theft-deterrent system is turned off, the
hazard warning lights will flash twice to
indicate that the system is turned off.
▼ To Stop the Alarm
A triggered alarm can be turned off using
any one of the following methods:
Pressing the unlock button on the
transmitter.
Starting the engine w
ith the push button
start.
(With the advanced keyless function)
Pressing a request switch on the
doors.
Pressing the electric liftgate/trunk lid
opener while the key is being carried.
The hazard warning ligh ts will flash twice.
Before Driving
Security System
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Hazardous Driving
WA R N I N G
Be extremely careful if it is necessary to
downshift on slippery surfaces:
Downshifting into lower gear while driving
on slippery surfaces is dangerous. The
sudden change in tire speed could cause
the tires to skid. This could lead to loss of
vehicle control and an accident.
When driving on ice or in water, snow,
mud, sand, or similar hazards:
Be cautious and allow extra distance for
braking.
Avoid sudden braking and sudden
maneuvering.
Do not pump the brakes. Continue to
press down on the brake pedal.
Refer to Antilock Brake System (ABS)
on page 4-66.
If you get stuck, select a lower gear and
accelerate slowly. Do not spin the front
wheels.
For more traction in starting on slippery
surfaces such as ice or packed snow, use
sand, rock salt, chains, carpeting, or
other nonslip material under the front
wheels.
NOTE
Use snow chains only on the front wheels.
Floor Mat
We recommend the use of Genuine
Mazda floor mats.
WA R N I N G
Make sure the floor mats are secured with
the grommets or the retainers to prevent
them from bunching up under the foot
pedals (Driver's side):
Using a floor mat that is not secured is
dangerous as it will interfere with the
accelerator and brake pedal operation
(driver's side), which could result in an
accident.
Only use a floor mat which conforms to the
shape of the floor on the driver's side and
make sure it is oriented correctly.
Secure the floor mat using the grommets or
retainers.
There are various ways to secure floor mats
depending on the type used, therefore
secure the mat according to the type.
After installing the floor mat, make sure
that it does not slide from side to side or
back and forth, and that there is sufficient
clearance with the accelerator and brake
pedals on the driver's side.
After removing the floor mat for cleaning
or some other reason, always securely
reinstall it while paying attention to the
precautions just mentioned.
Before Driving
Driving Tips
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