sensor MAZDA MODEL 3 HATCHBACK 2021 Service Manual

i-ACTIVSENSE*
▼i-ACTIVSENSE
i-ACTIVSENSE is a collective term
covering a series of advanced safety
and driver support systems which
make use of cameras and sensors. The
systems consist of active safety and
pre-crash safety systems.
These systems are designed to assist
the driver in safer driving by reducing
the load on the driver and helping to
avert collisions or reduce their severity.
However, because each system has its
limitations, always drive carefully and
do not rely solely on the systems.
▼Active Safety Technology
Active Safety Technology supports safer
driving by helping the driver to
recognize potential hazards and avert
accidents.
Driver awareness support systems
Nighttime visibility
Adaptive Front Lighting System
(AFS).................................. page 4-90
High Beam Control System
(HBC).................................page 4-90
Left/right side and rear side detection
Lane Departure Warning System
(LDWS).............................. page 4-92
Blind Spot Monitoring (BSM)...............
.......................................... page 4-96
Road sign recognition
Tra
ffic Sign Recognition System
(TSR)................................ page 4-101
Inter-vehicle distance recognition
Distance & Speed Alert (DSA) .............
........................................ page 4-108
Front obstruction detection when
approaching a crosswalk
Front Cross Tra ffic Alert (FCTA) ............
........................................ page 4-113
Rear obstruction detection when
leaving a parking space
Rear Cross Tra ffic Alert (RCTA) .............
........................................ page 4-116
Full-surround recognition
360°View Monitor............ page 4-168
Driver fatigue detection
Driver Attention Alert (DAA) ...............
........................................ page 4-109
Driver Monitoring (DM).... page 4-111
Driver support systems
Inter-vehicle distance
Mazda Radar Cruise Control
(MRCC)........................... page 4-120
Mazda Radar Cruise Control with Stop
& Go function (MRCC with Stop & Go
function).......................... page 4-128
Lane departure
Lane-keep Assist System (LAS) .............
........................................ page 4-154
Inter-vehicle distance and lane
keeping
Tra ffic Jam Assist (TJA)........ page 4-139
When Driving
i-ACTIVSENSE
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▼Pre-Crash Safety Technology
Pre-crash safety technology is designed
to assist the driver in averting collisions
or reducing their severity in situations
where they cannot be avoided.
Collision damage reduction
Forward driving
Smart Brake Support (SBS) ..................
........................................ page 4-158
Reverse driving
Smart Brake Support [Rear]
(SBS
-R).............................page 4-160
Smart Brake Support [Rear Crossing] (S
BS -RC)............................. page 4-164
▼ Camera and Sensors
Forward Sensing Camera (FSC)
The Forward Sensing Camera (FSC)
detects lane indications and recognizes
headlights, taillights and city lights
during nighttime driving. In addition, it
also detects the vehicle ahead,
pedestrians, or obstructions. The
following systems use the Forward
Sensing Camera (FSC).
High Beam Control system (HBC)Lane Departure Warning System
(LDWS)
Tra
ffic Sign Recognition System (TSR)Distance & Speed Alert (DSA)Driver Attention Alert (DAA)Mazda Radar Cruise Control
(MRCC)
Mazda Radar Cruise Control with
Stop & Go function (MRCC with
Stop & Go function)
Lane-keep Assist System (LAS)Tra
ffic Jam Assist (TJA)Smart Brake Support (SBS)
The Forward Sensing Camera (FSC) is
installed at the top of the windshield
near the rearview mirror.
Refer to Forward Sensing Camera
(FSC) on page 4-203.
Front radar sensor
The front radar sensor detects radio
waves re flected o ff a vehicle ahead
sent from the radar sensor. The
following systems use the front radar
sensor.
Distance & Speed Alert (DSA)Mazda Radar Cruise Control
(MRCC)
Mazda Radar Cruise Control with
Stop & Go function (MRCC with
Stop & Go function)
Tra ffic Jam Assist (TJA)Smart Brake Support (SBS)
The front radar sensor is mounted
behind the radiator grille.
Refer to Front Radar Sensor on page
4-207.
Front side radar sensor
The front side radar sensors detects
radio waves re flected off a vehicle
ahead sent from the radar sensor. The
following systems use the front side
radar sensor.
Front Cross Tra ffic Alert (FCTA)
The front side radar sensors are
installed inside the front bumper, one
on the left side and one on the right
side.
Refer to Front Side Radar Sensor on
page 4-209.
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Rear side radar sensor
The rear side radar sensors emit radio
waves and detect the radio waves
reflected off a vehicle approaching
from the rear or an obstruction. The
following systems 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 are installed
inside the rear bumper, one on the left
side and one on the right side.
Refer to Rear Side Radar Sensor on
page 4-211.
Rear/rear corner/rear side ultrasonic
sensor
The ultrasonic sensor detects ultrasonic
waves reflected
o ff obstructions at the
rear sent from the ultrasonic sensors.
The following systems use the
ultrasonic sensor.
Smart Brake Support [Rear] (SBS -R)Smart Brake Support [Rear Crossing]
(SBS -RC)
The ultrasonic sensors are mounted in
the rear bumper.
Refer to Rear/Rear corner/Rear Side
Ultrasonic Sensor on page 4-212.
Front camera/side cameras/rear
camera
The front camera, side cameras, and
rear camera shoot images of the area
surrounding the vehicle. The 360°View
Monitor uses each camera.
Cameras are installed to the front
bumper, door mirrors, and rear
bumper.
Refer to Front Camera/Side Cameras/
Rear Camera on page 4-213.
Driver monitoring camera
The driver monitoring camera detects
changes in the driver's facial features
and estimates the amount of
accumulated fatigue and sleepiness of
the driver. The following systems use
the driver monitoring camera.
Driver Monitoring (DM)
The driver monitoring camera is
mounted in the center display.
Refer to Driver Monitoring Camera on
page 4-214.
▼ i-ACTIVSENSE Status Symbol
(Warning/Risk Avoidance Support
System)
*
The system noti
fies the driver of any of
the following system status using the
color or OFF indication of the
i-ACTIVSENSE status symbol
(Warning/risk avoidance support
system).
Lane Departure Warning System
(LDWS)
Blind Spot Monitoring (BSM)Distance & Speed Alert (DSA)Front Cross Tra ffic Alert (FCTA)Rear Cross Tra ffic Alert (RCTA)Lane-keep Assist System (LAS)
NOTE
The status of the system turned on
using the personalization feature is
displayed.
i-ACTIVSENSE status symbol
(warning/risk avoidance support
system) (white)
When Driving
i-ACTIVSENSE
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The BSM will not operate under the
following circumstances.
The vehicle speed falls below
about 10 km/h (6.3 mph) even
though the i-ACTIVSENSE warning
indication/warning light is turned
off.
The shift lever (manual
transmission)/selector lever
(automatic transmission) is shifted
to reverse (R) and the vehicle is
reversing.
The turning radius is small (making
a sharp turn, turning at
intersections).
In the following cases, the
i-ACTIVSENSE warning indication/
warning light turns on and operation
of the system is stopped. If the
i-ACTIVSENSE warning indication/
warning light remains illuminated,
have the vehicle inspected at an
Authorized Mazda Dealer as soon as
possible.
Some problem with the system
including the BSM warning
indicator lights is detected.
A large deviation in the installation
position of a rear side radar sensor
on the vehicle has occurred.
There is a large accumulation of
snow or ice on the rear bumper
near a rear side radar sensor.
Remove any snow, ice or mud on
the rear bumper.
Driving on snow-covered roads for
long periods.
The temperature near the rear side
radar sensor becomes extremely
hot due to driving for long periods
on slopes during the summer.
The battery voltage has decreased.Under the following conditions, the
rear side radar sensor cannot detect
target objects or it may be di fficult to
detect them.
The rear bumper around the rear
side radar sensor is deformed.
Radio wave interference from a
radar sensor equipped on a nearby
vehicle.
The approaching vehicle is any of
the following shapes.
a) The size of the vehicle body is
extremely small.
b) The vehicle height is extremely low or high.
c) A special type of vehicle with a complex shape.
A vehicle is in the detection area at
the rear in an adjacent driving lane
but it does not approach. The BSM
determines the condition based on
radar detection data.
A vehicle is traveling alongside
your vehicle at nearly the same
speed for an extended period of
time.
Vehicles approaching in the
opposite direction.
A vehicle in an adjacent driving
lane is attempting to pass your
vehicle.
A vehicle is in an adjacent lane on
a road with extremely wide driving
lanes. The detection area of the
rear side radar sensor is set at the
road width of expressways.
In the following case, the flashing of
the BSM warning indicator light, and
the activation of the warning sound
and the warning screen indicator
display may not occur or they may be
delayed.
A vehicle makes a lane change
from a driving lane two lanes over
to an adjacent lane.
Driving on steep slopes.Crossing the summit of a hill or
mountain pass.
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When there is a difference in the
height between your driving lane
and the adjacent lane.
Directly after the BSM system
becomes operable by changing the
setting.
If the road width is extremely
narrow, vehicles two lanes over may
be detected. The detection area of
the rear side radar sensor is set
according to the road width of
expressways.
The BSM warning indicator light may
turn on and the vehicle detection
screen may be displayed in the
display in reaction to stationary
objects (guardrails, tunnels,
sidewalls, and parked vehicles) on
the road or the roadside.
1. Objects such as guardrails and concrete walls running alongside
the vehicle.

1. Places where the width between guardrails or walls on each side of
the vehicle narrows.

1. The walls at the entrance and exits of tunnels, turnouts.

A BSM warning indicator light may
fl ash or the warning beep may be
activated several times when making
a turn at a city intersection.
Tu r n off the BSM while pulling a
trailer or while an accessory such as a
bicycle carrier is installed to the rear
of the vehicle. Otherwise, the radar’s
radio waves will be blocked causing
the system to not operate normally.
In the following cases, it may be
diffi cult to view the
illumination/
fl ashing of the BSM warning
indicator lights equipped on the
door mirrors.
Snow or ice is adhering to the door
mirrors.
The front door glass is fogged or
covered in snow, frost or dirt.
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The rear side radar sensor of the BSM
may be regulated under the radio
wave related laws of the country
where the vehicle is driven. If this
system is used abroad, it may be
necessary to turn off the system.
Refer to Rear Side Radar Sensor on
page 4-211.
The system switches to the Rear
Cross Tra ffic Alert (RCTA) function
when the shift lever (manual
transmission) or the selector lever
(automatic transmission) is shifted to
the reverse (R) position.
Refer to Rear Cross Tra ffic Alert
(RCTA) on page 4-116.
▼ Blind Spot Monitoring (BSM)
Warning Indicator Lights/Display
Indicator/Blind Spot Monitoring
(BSM) Warning Beep
The BSM system noti
fies the driver of
the presence of vehicles in adjacent
lanes or at the rear of the vehicle using
the BSM warning indicator light, the
warning sound and the display
indicator while the systems are
operational.
BSM warning indicator lights
The BSM warning indicator lights are
equipped on the left and right door
mirrors. The warning indicator lights
turn on when a vehicle approaching
from the rear in an adjacent lane is
detected.
When the ignition is switched ON, the
warning indicator light turns on
momentarily and then turns o ff after a
few seconds.
Function for canceling illumination
dimmer
If the BSM warning indicator lights turn
on when the parking lights are turned
on, the brightness of the BSM warning
indicator lights is dimmed.
If the BSM warning indicator lights are
di fficult to see due to glare from
surrounding brightness when traveling
on snow-covered roads or under foggy
conditions, press the dimmer
cancellation button to cancel the
dimmer and increase the brightness of
BSM warning indicator lights when
they turn on.
Refer to Dashboard Illumination on
page 4-18.
Display indicator
The detected approaching vehicle and
warning are displayed in the
multi-information display and active
driving display (vehicles with active
driving display).
Multi-information Display
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▼Tra
ffic Sign Display Indication
The following traffi c signs are displayed
on the active driving display/
instrument cluster.
Speed limit signs
Do not enter signs
Stop signs
NOTE
Speed limit signs
When the vehicle speed is about 1
km/h (0.6 mph) or faster, the speed
limit sign is displayed when any one
of the following conditions are met.
The Forward Sensing Camera (FSC)
recognizes a speed limit sign as a
sign targeted for your vehicle and
the vehicle passes it.
The speed limit sign stored in the
navigation system is read.
In the following cases, display of the
speed limit sign stops.
Each sensor determines that the
vehicle has changed direction of
travel.
The Forward Sensing Camera (FSC)
recognizes a new speed limit sign
which di ffers from the previous
one (displays the new speed limit
sign).
The speed limit sign stored in the
navigation system is not read
within a certain period of time (if
the Forward Sensing Camera (FSC)
does not recognize a speed limit
sign, the speed limit sign stored in
the navigation system is displayed).
The vehicle speed exceeds the
displayed speed limit sign by 30
km/h (19 mph) or more after a
certain period of time has elapsed
since the speed limit sign was
displayed. (Except when there is
information for the speed limit sign
in the navigation system)
Do not enter signs
A do not enter sign is displayed
when all of the following conditions
are met.
The vehicle speed is about 60
km/h (37 mph) or slower.
The Forward Sensing Camera (FSC)
recognizes a do not enter sign as a
sign targeted for your vehicle and
the vehicle passes it.
When the Forward Sensing Camera
(FSC) recognizes the do not enter
sign and a certain period of time has
elapsed since the vehicle passed the
sign, display of the do not enter sign
stops.
Stop sign
A stop sign is displayed when all of
the following conditions are met:
The vehicle speed is about 65
km/h (40 mph) or slower.
The Forward Sensing Camera (FSC)
recognizes a stop sign as a sign
targeted for your vehicle.
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An object that reflects the radio
waves of the radar such as a
parked vehicle, guardrail, or wall is
directly next to your vehicle.
Vehicles are stopped in the area
around your vehicle such as during
heavy tra ffic.
A vehicle approaching from the
front or side of your vehicle slows
down.
A vehicle approaching from the
front or left side of your vehicle
makes a right or left turn directly in
front of your vehicle.
A vehicle or pedestrian moves in
the parking lot or on the sidewalk
in the area surrounding your
vehicle.
After making a left or right turn, an
on-coming vehicle is present.
When passing an on-coming
vehicle.
A vehicle overtakes your vehicle
while it is stopped.
Your vehicle is in an area where
strong radio waves or electrical
noise may occur such as near a
television tower or power plant.
Under the following conditions, the
front side radar sensor cannot detect
approaching vehicles or it might be
di fficult to detect them, and the
system may not operate normally.
The front side radar sensor
detection area is obstructed by a
nearby wall or vehicle.
Directly after the system becomes
operable.
Radio wave interference from a
radar sensor equipped on a nearby
vehicle.
The approaching vehicle has any of
the following shapes.
a) The size of the vehicle body is extremely small.
b) The vehicle height is extremely low or high.
c) A special type of vehicle with a complex shape
A vehicle suddenly enters the
detection area from the front or
side of your vehicle.
A vehicle that has stopped
suddenly starts to move.
Multiple objects move at the same
time.
The vehicle is driven in bad
weather conditions such as heavy
rain, fog , snow, or sand storms.
The vehicle is driven on a sharp
curve or on bumpy roads.
An object that re flects the radio
waves of the radar such as a
parked vehicle, guardrail, or wall is
directly next to your vehicle.
A vehicle approaches while turning
(Such as roundabout)
The vehicle is driven at an
extremely slow speed.
In the following cases, the system
turns on the i-ACTIVSENSE warning
indication/warning light and
operation of the system is stopped. If
the i-ACTIVSENSE warning
indication/warning light remains on,
have the vehicle inspected by an
Authorized Mazda Dealer as soon as
possible.
Some problem with the system has
occurred.
The front side radar sensor
installation position is greatly
deviated.
There is a large accumulation of
snow or ice on the front bumper
near a front side radar sensor.
The temperature near the radar
sensors becomes extremely hot
due to driving for a long time on
slopes during the summer.
The battery voltage has decreased.
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The front side radar sensor of the
FCTA may be regulated under the
radio wave related laws of the
country where the vehicle is driven.
If this system is used abroad, it may
be necessary to turn off the system.
Refer to Front Side Radar Sensor
on page 4-209.
▼ Canceling Operation of Front
Cross Tra
ffic Alert (FCTA)
The FCTA can be set to inoperable.
(If only the FCTA is turned
off)
Refer to the Settings section in the
Mazda Connect Owner's Manual.
(If the FCTA is turned o ff by
operating the i-ACTIVSENSE OFF
switch)
Refer to i-ACTIVSENSE OFF Switch
on page 4-89.
NOTE
If the ignition is switched OFF while
you have canceled the system using the
i-ACTIVSENSE OFF switch, the system
is automatically enabled the next time
the ignition is switched ON. However,
if the system is canceled using the
personalization features, the system is
not automatically enabled.
Rear Cross Tra ffic Alert
(RCTA)
*
▼ Rear Cross Traffi
c Alert (RCTA)
The RCTA system is designed to assist
the driver in checking the area to the
rear left and right sides of your vehicle
while your vehicle is reversing by
alerting the driver to the presence of
vehicles approaching the rear of your
vehicle.
The RCTA system detects vehicles
approaching from the rear left and
right sides of your vehicle and the rear
of your vehicle while your vehicle is
being reversed out of a parking space,
and notifies the driver of possible
danger using the Blind Spot Monitoring
(BSM) warning indicator lights and the
warning buzzer.
1. Your vehicle
2. Detection areas
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A vehicle approaching from the
rear left and right side of your
vehicle makes a right or left turn
directly in front of your vehicle.
A vehicle overtakes your vehicle
while it is stopped.
Your vehicle is in an area where
strong radio waves or electrical
noise may occur such as near a
television tower or power plant.
In the following cases, the
i-ACTIVSENSE warning indication/
warning light turns on and operation
of the system is stopped. If the
i-ACTIVSENSE warning indication/
warning light remains illuminated,
have the vehicle inspected at an
Authorized Mazda Dealer as soon as
possible.
Some problem with the system
including the Blind Spot
Monitoring (BSM) warning
indicator lights has occurred.
A large deviation in the installation
position of a rear side radar sensor
on the vehicle has occurred.
There is a large accumulation of
snow or ice on the rear bumper
near a rear side radar sensor.
Driving on snow-covered roads for
long periods.
The temperature near the radar
sensors becomes extremely hot
due to driving for long periods on
slopes during the summer.
The battery voltage has decreased.Under the following conditions, the
rear side radar sensor cannot detect
approaching vehicles or it might bedi fficult to detect them, and the
system may not operate normally.
The vehicle speed when reversing
is about 15 km/h (9 mph) or
faster.
The rear side radar sensor
detection area is obstructed by a
nearby wall or parked vehicle.
(Reverse the vehicle to a position
where the radar sensor detection
area is no longer obstructed.)
1. Your vehicle
A vehicle is approaching directly
from the rear of your vehicle.
1. Your vehicle
The vehicle is parked at an angle.
1. Your vehicle
Directly after the RCTA system
becomes operable using the
personalization feature.
Radio wave interference from a
radar sensor equipped on a nearby
parked vehicle.
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