2021 MAZDA MODEL 3 HATCHBACK sensor

Do not adhere stickers (including
transparent stickers) to the surface of
the radiator grille and front emblem
in and around the front radar sensor,
and do not replace the radiator grille
and front emblem with any product
that is not a genuine product
designed for use with the front radar
sensor.
 The front radar sensor includes a
function for detecting soiling of the
radar sensor's front surface and
informing the driver, however,
depending on the conditions, it may
require time to detect or it may not
detect plastic shopping bags, ice or
snow. If this occurs, the system may
not operate correctly, therefore
always keep the front radar sensor
clean.
 Do not install a grille guard.
 If the front part of the vehicle has
been damaged in a vehicle accident,
the position of the front radar sensor
may have moved. Stop the system
immediately and always have the
vehicle inspected at an Authorized
Mazda Dealer.
 Do not use the front bumper to push
other vehicles or obstructions such
as when pulling out of a parking
space. Otherwise, the front radar
sensor could be hit and its position
deviated.
 Do not remove, disassemble, or
modify the front radar sensor.
 For repairs, replacement or paint
work around the front radar sensor,
consult an Authorized Mazda Dealer.
 Do not modify the suspensions. If
the suspensions are modi fied, the
vehicle's posture could change and
the front radar sensor may not be
able to correctly detect a vehicle
ahead or an obstruction.NOTE
Under the following conditions, the
front radar sensor may not be able to
detect vehicles ahead or obstructions
correctly and each system may not
operate normally.
The rear surface of a vehicle ahead
does not reflect radio waves
e ff ectively, such as an unloaded
trailer or an automobile with a
loading platform covered by a soft
top, vehicles with a hard plastic
tailgate, and round-shaped
vehicles.
Vehicles ahead with low vehicle
height and thus less area for
re flecting radio waves.
Visibility is reduced due to a
vehicle ahead casting off
water,
snow, or sand from its tires and
onto your windshield.
The trunk/luggage compartment is
loaded with heavy objects or the
rear passenger seats are occupied.
Ice, snow, or soiling is on the front
surface of the front emblem.
During inclement weather such as
rain, snow, or sand storms.
When driving near facilities or
objects emitting strong radio
waves.
Under the following conditions, the
front radar sensor may not be able to
detect vehicles ahead or
obstructions.
The beginning and end of a curve.Roads with continuous curves.Narrow lane roads due to road
construction or lane closures.
The vehicle ahead enters the radar
sensor's blind spot.
The vehicle ahead is running
abnormally due to accident or
vehicle damage.
When Driving
i-ACTIVSENSE
4-208
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Roads with repeated up and down
slopes
Driving on poor roads or unpaved
roads.
The distance between your vehicle
and the vehicle ahead is extremely
short.
A vehicle suddenly comes close,
such as by cutting into your lane.
To prevent incorrect operation of the
system, use tires of the same
specified size, manufacturer, brand,
and tread pattern on all four wheels.
In addition, do not use tires with
significantly di fferent wear patterns
or tire pressures on the same vehicle
(Including the temporary spare tire).
If the battery power is weak, the
system may not operate correctly.
When driving on roads with little
tra ffic and few vehicles ahead or
obstructions for the front radar
sensor to detect, “Safety and Driver
Support Systems Temporarily
Disabled. Front Radar Obscured.
Drive Safely” may be temporarily
displayed, however, this does not
indicate a problem.
The radar sensors are regulated by
the relevant radio wave laws of the
country in which the vehicle is
driven. If the vehicle is driven
abroad, authorization from the
country in which the vehicle is driven
may be required.
Front Side Radar Sensor*
▼ Front Side Radar Sensor
Your vehicle is equipped with front
side radar sensor. The following
systems also use the front side radar
sensor.
Front Cross Tra
ffic Alert (FCTA)
The front side radar sensor function by
detecting the radio waves re flected o ff
a vehicle approaching from the front or
an obstruction sent from the radar
sensor.
1. Front side radar sensor

The front side radar sensors are
installed inside the front bumper, one
on each side.
Always keep the surface of the front
bumper near the front side radar
sensors clean so that they operate
normally. Also, do not apply items such
as stickers.
Refer to Exterior Care on page 6-48.
CAUTION
If the front bumper receives a severe
impact, the system may no longer
operate normally. Stop the system
immediately and have the vehicle
inspected at an Authorized Mazda
Dealer.
When Driving
i-ACTIVSENSE
*Some models.4-209
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

NOTE
The detection ability of the front side
radar sensor has limitations. In the
following cases, the detection ability
may lower and the system may not
operate normally.
The front bumper near the front
side radar sensor has become
deformed.
Snow, ice or mud adheres to the
front side radar sensor on the front
bumper.
Under bad weather conditions
such as rain, snow and fog.
Under the following conditions, the
front side radar sensor cannot detect
target objects or it may be difficult to
detect them.
Small motorcycles, bicycles,
pedestrians, animals, shopping
carts, and stationary objects on a
road or a road side.
Vehicle shapes which do not re flect radar waves well such as
empty trailers with a low vehicle
height and sports cars.
Vehicles are shipped with the
direction of the front side radar
sensor adjusted for each vehicle to a
loaded vehicle condition so that the
front side radar sensor detect
approaching vehicles correctly. If the
direction of the front side radar
sensor has deviated for some reason,
have the vehicle inspected at an
Authorized Mazda Dealer.
For repairs or replacement of the
front side radar sensor, or bumper
repairs, paintwork, and replacement
near the radar sensors, consult an
Authorized Mazda Dealer.
The radar sensors are regulated by
the relevant radio wave laws of the
country in which the vehicle is
driven. If the vehicle is driven
abroad, authorization from the
country in which the vehicle is driven
may be required.
When Driving
i-ACTIVSENSE
4-210
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Rear Side Radar Sensor*
▼Rear Side Radar Sensor
Your vehicle is equipped with rear side
radar sensor. The following systems
also use the rear side radar sensor.
Blind Spot Monitoring (BSM)Rear Cross Tra
ffic Alert (RCTA)Smart Brake Support [Rear Crossing]
(SBS -RC)
The rear side radar sensors emit radio
waves and detect the radio waves
re flected off a vehicle approaching
from the rear or an obstruction.
4–Door
1. Rear side radar sensor

5–Door
1. Rear side radar sensor

The rear side radar sensors are installed
inside the rear bumper, one on each
side.
Always keep the surface of the rear
bumper near the rear side radar
sensors clean so that they operate
normally. Also, do not apply items such
as stickers.
Refer to Exterior Care on page 6-48.
CAUTION
If the rear bumper receives a severe
impact, the system may no longer
operate normally. Stop the system
immediately and have the vehicle
inspected at an Authorized Mazda
Dealer.
NOTE
The detection ability of the rear side
radar sensor has limitations. In the
following cases, the detection ability
may lower and the system may not
operate normally.
The rear bumper near the rear side
radar sensor has become
deformed.
Snow, ice or mud adheres to the
rear side radar sensor on the rear
bumper.
Under bad weather conditions
such as rain, snow and fog.
Under the following conditions, the
rear side radar sensor cannot detect
target objects or it may be di fficult to
detect them.
Small motorcycles, bicycles,
pedestrians, animals, shopping
carts, and stationary objects on a
road or a road side.
Vehicle shapes which do not re flect radar waves well such as
empty trailers with a low vehicle
height and sports cars.
When Driving
i-ACTIVSENSE
*Some models.4-211
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Vehicles are shipped with the
direction of the rear side radar
sensor adjusted for each vehicle to a
loaded vehicle condition so that the
rear side radar sensor detect
approaching vehicles correctly. If the
direction of the rear side radar
sensor has deviated for some reason,
have the vehicle inspected at an
Authorized Mazda Dealer.
For repairs or replacement of the rear
side radar sensor, or bumper repairs,
paintwork, and replacement near the
radar sensors, consult an Authorized
Mazda Dealer.
The radar sensors are regulated by
the relevant radio wave laws of the
country in which the vehicle is
driven. If the vehicle is driven
abroad, authorization from the
country in which the vehicle is driven
may be required.
Rear/Rear corner/RearSide Ultrasonic Sensor
*
▼ Rear/Rear corner/Rear Side
Ultrasonic Sensor
The ultrasonic sensors function by
emitting ultrasonic waves which are
re
flected
o ff obstructions at the rear
and the returning ultrasonic waves are
picked up by the ultrasonic sensors.
4–Door
1. Rear ultrasonic sensor
2. Rear corner ultrasonic sensor
3. Rear side ultrasonic sensor

5–Door
1. Rear ultrasonic sensor
2. Rear corner ultrasonic sensor
3. Rear side ultrasonic sensor

The ultrasonic sensors are mounted in
the rear bumper.
When Driving
i-ACTIVSENSE
4-212*Some models.
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Tire Pressure MonitoringSystem (TPMS)
▼Tire Pressure Monitoring System
(TPMS)
The TPMS monitors the air pressure of
each tire and if it decreases below the
speci
fied value, the system
notifies the
driver by turning on the TPMS warning
light in the instrument cluster and
indicating a message on the
multi-information display.
For the TPMS, the air pressure data
sent from the tire pressure sensors
installed on each wheel via radio signal
is received by the receiver unit in the
vehicle to monitor the tire pressures.
1. Tire pressure sensors

In addition, the current tire pressures
can be checked using the center
display.
Refer to the Vehicle Status Monitor
section in the Mazda Connect
Owner's Manual.
NOTE
When the ambient temperature is
low, the tire temperatures also
decrease. If the tire temperatures
decrease, the air pressure in the tires
will also decrease which could turn
on the TPMS warning light.
Before driving, visually inspect the
tires for abnormalities. Additionally,
inspect the tire pressures monthly. A
digital type air pressure gauge is
recommended for inspecting the tire
pressures.
The TPMS is not a substitute for your
own periodic inspection of the tires.
Always inspect the tires yourself
periodically.
CAUTION
 Each tire, including the spare (if
provided), should be checked
monthly when cold and
inflated to
the in flation pressure recommended
by the vehicle manufacturer on the
vehicle placard or tire inflation
pressure label. (If your vehicle has
tires of a different size than the size
indicated on the vehicle placard or
tire in flation pressure label, you
should determine the proper tire in flation pressure for those tires.)
As an added safety feature, your
vehicle has been equipped with a
tire pressure monitoring system
(TPMS) that illuminates a low tire
pressure telltale when one or more
of your tires is significantly
under-in flated. Accordingly, when
the low tire pressure telltale
illuminates, you should stop and
check your tires as soon as possible,
and in flate them to the proper
pressure. Driving on a signi ficantly
under-in flated tire causes the tire to
overheat and can lead to tire failure.
Under-in flation also reduces fuel
e ffi ciency and tire tread life, and may
a ff ect the vehicle's handling and
stopping ability.
When Driving
Tire Pressure Monitoring System (TPMS)
4-219
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

Please note that the TPMS is not a
substitute for proper tire
maintenance, and it is the driver's
responsibility to maintain correct tire
pressure, even if under-inflation has
not reached the level to trigger
illumination of the TPMS low tire
pressure telltale.
Your vehicle has also been equipped
with a TPMS malfunction indicator to
indicate when the system is not
operating properly.
The TPMS malfunction indicator is
combined with the low tire pressure
telltale. When the system detects a
malfunction, the telltale will flash for
approximately one minute and then
remain continuously illuminated.
This sequence will continue upon
subsequent vehicle start-ups as long
as the malfunction exists. When the
malfunction indicator is illuminated,
the system may not be able to detect
or signal low tire pressure as
intended. TPMS malfunctions may
occur for a variety of reasons,
including the installation of
replacement or alternate tires or
wheels on the vehicle that prevent
the TPMS from functioning properly.
Always check the TPMS malfunction
telltale after replacing one or more
tires or wheels on your vehicle to
ensure that the replacement or
alternate tires and wheels allow the
TPMS to continue to function
properly.
 To avoid false readings, the system
samples for a little while before
indicating a problem. As a result it
will not instantaneously register a
rapid tire de flation or blow out.▼ If there is a problem with the Tire
Pressure Monitoring System
(TPMS)
If the TPMS warning light
flashes, there
may be a problem with the system.
Consult an Authorized Mazda Dealer
to have the system inspected.
Refer to Tire Pressure Monitoring
System (TPMS) Warning Indication/
Warning Light (Flashing) on page
7-33.
In the following cases, the system
cannot recognize the tire pressures
correctly and the TPMS warning light
may flash.
There is equipment or a device
nearby emitting radio signals the
same as a tire pressure sensor.
A metallic object such as a
non-genuine electronic device is
installed near the center of the
dashboard (obstructs the radio
signals from the tire pressure sensors
to the receiver).
A device such as one of the following
is used in the cabin.
Electronic devices such as a
computer.
Converter devices such as a
DC -AC converter.
There is a large accumulation of
snow or ice around the vehicle tires.
The battery in a tire pressure sensor
is dead.
A wheel not equipped with a tire
pressure sensor is used.
Tires employing steel in the sidewall
of the tire are installed.
Tire chains are used.
When Driving
Tire Pressure Monitoring System (TPMS)
4-220
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34

▼When a tire pressure decreases
If the TPMS warning light turns on, a
tire pressure may be low. Inspect the
tire pressures and adjust them to the
correct in
flation pressure.
Refer to Tire Pressure Monitoring
System (TPMS) Warning Indication/
Warning Light (Turns on) on page
7-37.
▼ Tires and Wheels
CAUTION
When inspecting/adjusting the tire
pressures, do not apply excessive force
to the air valve of the tire pressure
sensor. Otherwise, the tire pressure
sensor could be damaged.
When changing tires and wheels
When changing the tires or wheels
(such as installing winter tires), it will
be necessary to regi
ster the ID signal
code of the tire pressure sensor to the
TPMS.
Have an Authorized Mazda Dealer do
the registration or register the ID signal
codes of the tire pressure sensors using
the following procedure.
NOTE
The tire pressure sensors on each
wheel have a unique ID signal code.
For the TPMS to operate correctly, the
ID signal codes of the tire pressure
sensors need to be registered to the
system.
1. Wait more than 19 minutes after changing a tire or wheel.
2. After more than 19 minutes havepassed, drive the vehicle at a speed
of about 25 km/h (16 mph) or
faster for 3 minutes or longer. While
driving, the ID signal codes of the
tire pressure sensors are
automatically registered.
NOTE
If you drive the vehicle within 19
minutes of changing a tire or wheel,
the TPMS warning light will fl ash
because the ID signal codes for the tire
pressure sensors were not registered.
In this case, stop the vehicle and
register the ID signal codes of the tire
pressure sensors following the
procedure.
When replacing tires and wheels
CAUTION
 When replacing the tires and wheels,
consult an Authorized Mazda Dealer
Otherwise, the tire pressure sensors
could be damaged when replacing
them.
 Do not install non-genuine wheels. If
wheels other than genuine ones are
installed, it may not be possible to
install the tire pressure sensors.
When replacing a tire or wheel, always
install the tire pressure sensor. The
following combinations of tires,
wheels, or tires and wheels are
possible.
The tire pressure sensor from the old
wheel is removed and it is installed
to the new wheel.
Only a tire is replaced without
replacing the tire pressure sensor and
wheel.
A new tire pressure sensor is installed
to a new wheel.
When Driving
Tire Pressure Monitoring System (TPMS)
4-221
Mazda3_8JM2-EA -20H_Edition1_new 2020-7-10 17:21:34