2021 MAZDA MODEL 3 HATCHBACK lane assist

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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▼i-ACTIVSENSE OFF Switch*
When the i-ACTIVSENSE OFF switch is
pressed, the following systems are
canceled and the i-ACTIVSENSE OFF
symbol (Warning/risk avoidance
support system) in the instrument
cluster is displayed.
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)
i-ACTIVSENSE OFF symbol (Warning/
risk avoidance support system)
If the i-ACTIVSENSE OFF switch is
pressed again, the systems return to
their original operation status and the
i-ACTIVSENSE OFF symbol (Warning/
risk avoidance support system) turns
off.
If the ignition is switched OFF while
you have canceled the systems using
the i-ACTIVSENSE OFF switch, the
systems are automatically enabled the
next time the ignition is switched ON.
However, if the systems are canceled
using the personalization features, the
systems are not automatically enabled.
NOTE
You can select systems you want to
cancel using the personalization
features.
Refer to the Settings section in the
Mazda Connect Owner's Manual.
When Driving
i-ACTIVSENSE
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Blind Spot Monitoring(BSM)
*
▼Blind Spot Monitoring (BSM)
The BSM is designed to assist the driver
in checking the area to the rear of the
vehicle on both sides during lane
changes by notifying the driver of the
presence of vehicles approaching from
the rear in an adjacent lane.
BSM operation
The BSM detects vehicles approaching
from the rear while traveling in the
forward direction at a speed of 10
km/h (6.3 mph) or faster and noti
fies
the driver by turning on the BSM
warning indicator light and displaying
the vehicle detection screen.
If the turn signal lever is operated to
signal a turn in the direction in which
the BSM warning indicator light is
illuminated while the approaching
vehicle is detected, the BSM notifies
the driver of possible danger flashing
on the BSM warning indicator light,
and by activating the warning sound
and the warning screen indicator
display.
The detection area on this system
covers the driving lanes on both sides
of the vehicle and from the rear part of
the front doors to about 50 m (164 ft)
behind the vehicle.
1. Your vehicle
2. Detection areas
WARNING
Always check the surrounding area
visually before making an actual lane
change:
The system is only designed to assist
you in checking for vehicles at your rear
when making a lane change. Due to
certain limitations with the operation
of this system, the BSM warning
indicator light, th e warning sound and
the warning screen indicator display
may not activate or they might be
delayed even though a vehicle is in an
adjacent driving lane. Always make it
your responsibility as a driver to check
the rear.
NOTE
The BSM will operate when all of the
following conditions are met:
The ignition is switched ON.The i-ACTIVSENSE warning
indication/warning light in the
instrument cluster is turned o ff.
The vehicle speed is about 10
km/h (6.3 mph) or faster.
When Driving
i-ACTIVSENSE
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NOTE
When you resume driving by pressing
the RES switch, your vehicle does not
start moving until the distance
between your vehicle and the vehicle
ahead lengthens to the specified
distance or farther.
If the MRCC with Stop & Go
function is temporarily canceled
during stop hold control, you cannot
resume driving by pressing the RES
switch when there are no vehicles in
front of your vehicle. Depress the
accelerator pedal and resume driving
the vehicle.
If the vehicle ahead starts moving
within 3 seconds after your vehicle is
stopped by the stop hold control,
headway control will resume even if
you do not resume driving your
vehicle, such as by depressing the
accelerator pedal.
Resume driving information
If you do not resume driving within a
few seconds after the vehicle ahead
starts moving , the multi-information
display vehicle-ahead indication
fl ashes to urge the driver to resume
driving. If you do not resume driving
after the indicator light flashes, a
sound is activated to urge you to
resume driving.
Tra ffic Jam Assist (TJA)*
▼ Tra
ffic Jam Assist (TJA)
The TJA is a system which consists of a
headway control function and a
steering assist function for reducing
driver fatigue during tra
ffic jams when
driving on expressways or highways.
This system performs headway control
to maintain a constant distance
between your vehicle and a vehicle
ahead at a preset vehicle speed
without you having to use the
accelerator or brake pedal. Even
further, with the steering assist
function, when vehicle lane lines are
detected, the function assists the driver
in keeping the vehicle within the lane
lines. If lane lines are not detected, the
function provides the driver driving
assistance in keeping the vehicle along
the motion path with the vehicle
ahead.
WARNING
Do not rely completely on TJA:
 The TJA is not an automated driving
system. In addition, the functions
have limitations. Do not rely
completely on the system and always
stay on course using the steering
wheel.
 Set a vehicle speed within the speed
limit according to the road
conditions and the weather
conditions.
When Driving
i-ACTIVSENSE
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Steering assist function
When lane lines are detected, the
function assists the driver in keeping
the vehicle within the lane lines. If lane
lines are not detected, the function
provides the driver driving assistance in
keeping the vehicle along the motion
path with the vehicle ahead.
NOTE
Steering assist limit warning
If the steering assist function cannot
keep the vehicle within the lane lines
while the steering assist function is
operating , a warning sound is activated
and a warning is displayed on the
multi-information display to urge the
driver to operate the steering wheel.
▼Tra
ffic Jam Assist (TJA) Display
Indication
The TJA setting status and operation
conditions are indicated on the
multi-information display or the active
driving display.
Multi-information display (Basic
display)
1. Vehicle ahead display
2. TJA set vehicle speed

When Driving
i-ACTIVSENSE
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Multi-information display
(i-ACTIVSENSE display)
1. Vehicle ahead display
2. TJA set vehicle speed

Active driving display
1. Vehicle ahead display
2. TJA set vehicle speed

Steering assist function display
When the steering assist function
operates, the steering assist operation
display on the display changes from
white to green.
NOTE
You can view the multi-information
display to check whether the steering
assist is performing controls in
conjunction with the traffic lane lines
or a vehicle ahead.
Inactive
Active (vehicle ahead)
Active (lane line)
If there is a problem with the TJA, a
message is displayed on the
multi-information display. Check the
details of the problem on the center
display and then have your vehicle
inspected by an Authorized Mazda
Dealer.
Refer to If a Warning Light Turns On or
Flashes on page 7-27.
When Driving
i-ACTIVSENSE
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Steering assist function
The steering assist function operates when all of the following conditions are met.
Your vehicle is moving and less than about 56 km/h (35 mph).White (yellow) lane lines on both sides are detected and you are driving near the
center of the lane, or your vehicle detects a vehicle ahead.
The steering wheel is not turned sharply.The turn signal lever is not operated.The headway control function is operating.(Manual transmission vehicle)
The vehicle speed is about 30 km/h (19 mph) or faster.
NOTE
The steering assist function operates so that the vehicle remains near the center of
the driving lane, however, depending on conditions such as the road curvature, road
slope and undulations, and vehicle speed, the function might not be able to keep
the vehicle near the center of the driving lane.
Setting method
1. CANCEL switch
2. RES switch
3. TJA switch

1. Press the TJA switch. The TJA standby indication (white) turns on. In addition, the TJA display
indication is displayed on the multi-information display at the same time.
When Driving
i-ACTIVSENSE
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In the following cases, the TJA cancel indication is displayed and a sound is activated
one time.
The DSC has operated.The Smart Brake Support (SBS) has operated.The vehicle is driven on a downslope for a long time.There is a problem with the system.The front radar sensor cannot detect target objects (during rain, fog , snow or other
inclement weather conditions, or when the radiator grille is dirty).
The parking brake is applied.Any of the doors is opened.The driver's seat belt is unfastened.The operation frequency of the braking by the TJA control is high.(Automatic transmission vehicle)
The parking brake is automatically applied during stop hold control.
(Manual transmission vehicle)
The vehicle speed decreases below 25 km/h (15 mph).The shift lever is in the neutral posi tion for a certain period of time.The clutch pedal is depressed for a certain period of time.The engine has stalled.

Steering assist function
If any of the following conditions occurs, the steering assist function is temporarily
canceled.
The headway control function is canceled.White (yellow) lane lines cannot be detected or a vehicle ahead cannot be
recognized.
Your vehicle speed is more than about 64 km/h (40 mph).The accelerator pedal is operated.The turn signal lever is operated.The vehicle is being driven on a sharp curve.The width of a lane is excessively narrow or wide.The vehicle crosses a lane line.The driver takes his/her hands o ff the steering wheel.The steering wheel is operated abruptly.There is a problem with the system.The temperature in the Forward Sensing Camera (FSC) is too high or too low.The windshield around the Forward Sensing Camera (FSC) is foggy.The windshield around the Forward Sensing Camera (FSC) is blocked by an
obstruction, causing poor forward visibility.

When Driving
i-ACTIVSENSE
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