2021 MAZDA MODEL 3 HATCHBACK immobilizer

3Before Driving
Use of various features, including keys, doors, mirrors and
windows.
Keys........................................ 3-2 Keys...................................... 3-2
Keyless Entry System...............3-4
Advanced Keyless Entry
System.....................................3-9 Advanced Keyless Entry
System
*................................. 3-9
Operational Range...............3-10
Doors and Locks..................... 3-11 Door Locks.......................... 3-11
Liftgate/Trunk Lid.................3-19
Inside Trunk Release Lever (4-
door)
*................................. 3-24
Fuel and Emission................... 3-25 Fuel and Engine Exhaust
Precautions......................... 3-25
Fuel-Filler Lid and Cap..........3-27
Mirrors.................................. 3-30 Mirrors................................3-30
Windows............................... 3-34 Power Windows...................3-34
Moonroof*.......................... 3-37
Security System.......................3-40 Modi fication and Add-
On Equipment..................... 3-40
Immobilizer System..............3-40
Theft-Deterrent System
*........3-42
Driving Tips............................ 3-44 Break-In Period.................... 3-44
Saving Fuel and Protection of the
Environment........................ 3-44
Hazardous Driving............... 3-45
Floor Mat............................ 3-46
Rocking the Vehicle..............3-46
Winter Driving..................... 3-47
Driving In Flooded Area........3-49
Overloading........................ 3-49
Driving on Uneven Road.......3-50
Turbocharger Information
(SKYACTIV -G 2.5T).............. 3-50
Towing.................................. 3-51 Trailer Towing...................... 3-51
Recreational Towing............. 3-51
*Some models.3-1
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Modification and
Add-On Equipment
▼ Modi
fication and Add-On
Equipment
Mazda cannot guarantee the
immobilizer and the theft-deterrent
system's operation if the system has
been modi fied 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
▼ Immobilizer System
The immobilizer system 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 modi fications 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, 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
3-40
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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 di fficult 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 o ff.
The security indicator light in the
instrument cluster flashes 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 illu minates for about 3
seconds and then turns o ff.
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 o ff,
and then restart the engine. If the
engine does not start after 3 or more
tries, contact an Authorized Mazda
Dealer.
Before Driving
Security System
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ON
This is the normal running position
after the engine is started. The
indicator light (amber) turns o ff. (The
indicator light (amber) illuminates
when the ignition is switched ON and
the engine is not running.)
Some indicator lights/warning lights
should be inspected before the engine
is started.
Refer to Warning/Indicator Lights on
page 4-23.
Refer to Indication/Indicator Lights on
page 4-25.
NOTE
When the push button start is pressed
to ON, the sound of the fuel pump
motor operating near the fuel tank can
be heard. This does not indicate an
abnormality.
Starting the Engine
▼ Starting the Engine
WARNING
Radio waves from the key may a
ffect
medical devices such as pacemakers:
Before using the key near people who
use medical devices, ask the medical
device manufacturer or your physician
if radio waves from the key will aff ect
the device.
NOTE
The key must be carried because the
key carries an immobilizer chip that
must communicate with the engine
controls at short range.
The engine can be started when the
push button start is pressed from o ff,
ACC, or ON.
The push button start system
functions (function which can start
the engine by only carrying the key)
can be deactivated to prevent any
possible adverse e ffect on a user
wearing a pacemaker or other
medical device. If the system is
deactivated, you will be unable to
start the engine by carrying the key.
Consult an Authorized Mazda Dealer
for details. If the push button start
system functions have been
deactivated, you can start the engine
by following the procedure indicated
when the key battery goes dead.
Refer to Engine Start Function When
Key Battery is Dead on page 4-8.
After starting a cold engine, the
engine speed increases and a
whining sound from the engine
compartment can be heard.
When Driving
Start/Stop Engine
4-5
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▼Engine Start Function When Key
Battery is Dead
CAUTION
When starting the engine by holding
the transmitter over the push button
start due to a dead key battery or a
malfunctioning key, be careful not to
allow the following, otherwise the
signal from the key will not be received
correctly and the engine may not start.

Metal parts of other keys or metal
objects touch the key.
Spare keys or keys for other vehicles
equipped with an immobilizer
system touch or come near the key.
Devices for electronic purchases, or
security passage touch or come near
the key.
If the engine cannot be started due to
a dead key battery, the engine can be
started using the following procedure:
1. Continue to depress the brake
pedal firmly until the engine has
completely started.
2. (Manual transmission)
Continue to depress the clutch
pedal firmly until the engine has
completely started.
(Automatic transmission)
Put the vehicle in park (P). If you
must restart the engine while the
vehicle is moving, shift into neutral
(N).
3. Make sure that the push button start indication light (green) flashes.
4. Align the center area of the emblem on the transmitter with the
center area of the push button start
while the push button start
indicator light (green) flashes.

1. Indicator light
2. Push button start
3. Transmitter
4. Emblem

5. Make sure that the push button start indicator light (green) turns
on.
6. Press the push button start to start the engine.
When Driving
Start/Stop Engine
4-8
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SignalWarning Refer to
*Liftgate-Ajar Warning Indication 7-37
Door-Ajar Warning Light
7-37
*1 The light turns on when the ignition is switched on for an operation check, and turns off a few
seconds later or when the engine is started. If the light does not turn on or remains turned on, have
the vehicle inspected at an Authorized Mazda Dealer.
▼ Indication/Indicator Lights
These lights turn on or
flash to notify the user of the system operation status or a
system malfunction.
Signal Indicator Refer to
(Green)Seat Belt Indicator Light (Rear seat)
2-27
*Front Passenger Air Bag Deactivation Indicator Light2-71
Security Indicator LightImmobilizer
System3-41
Theft-Deterrent System
3-42
Malfunction 7-34
(Green) KEY Indicator Light
4-5
Wrench Indication/Indicator Light*14-29
*Shift Position Indication4-38
Lights-On Indicator Light
4-46
When Driving
Instrument Cluster and Display
*Some models.4-25
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“Key Not Detected” is displayed
If the presence of the key cannot be
detected (dead battery, battery
malfunction, no key), it is displayed
when the driver attempts to start the
engine (push button start operation,
brake pedal depression).
Displayed when it is determined that
a key that was in the vehicle has
been removed from the vehicle. (Key
taken out warning. Other thanIG -OFF).
▼ Security Indicator Light
If the security indicator light
flashes
continuously while you are driving , do
not shut o ff the engine. Go to an
Authorized Mazda Dealer and have it
checked. If the engine is shut o ff while
the indicator light is flashing, you will
not be able to restart it.
Make sure the key is within the
operational range for signal
transmission. Switch the ignition o ff,
and then restart the engine. If the
engine does not start after 3 or more
tries, contact an Authorized Mazda
Dealer.
NOTE
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.
▼ High Beam Control System (HBC)
Warning Indication/Warning Light
(Amber)
*
The light remains turned on if there is a
problem with the system. Have your
vehicle inspected at an Authorized
Mazda Dealer.
▼i-ACTIVSENSE Warning
Indication/Warning Light*
The indication displays if the system
has a malfunction.
Check the reason for the indication
displaying on the center display or
multi-information display.
Refer to If a Warning Light Turns On or
Flashes on page 7-27.
▼Exterior Light Warning Indication/
Warning Light
This light illuminates if there is a
malfunction in the exterior lights
(except license plate lights). Have your
vehicle inspected by an Authorized
Mazda Dealer.
If Trouble Arises
Warning/Indicator Lights and Warning Sounds
7-34*Some models.
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Declaration of Conformity
▼Keyless Entry System/Immobilizer System
Customer Information and Reporting Safety Defects
Declaration of Conformity
8-35
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