Mazda 3 Sedan 2020 Owner's Manual page 252

When Driving
i-ACTIVSENSE
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.
4-98
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

flash or the warning beep may be
activated several times when making
a turn at a city intersection.
Turn 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

difficult to view the illumination/
flashing 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.