Mazda 3 2020 Owner's Manual page 275

If a Mazda genuine trailer hitch is

used, the BSM is automatically
turned off.
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.
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 4-237.
The system switches to the Rear

Cross Traffic 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 Traffic Alert
(RCTA) on page 4-134.
▼ Blind Spot Monitoring (BSM)
Warning Indicator Lights/Display
Indicator/Blind Spot Monitoring
(BSM) Warning Beep
The BSM system notifies 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 off after a
few seconds.
Function for cancelling illumination
dimmer
If the BSM warning indicator lights turn
on when the position lights are turned
on, the brightness of the BSM warning
indicator lights is dimmed.
If the BSM warning indicator lights are
difficult to see due to glare from
surrounding brightness when travelling
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 Instrument Panel Illumination
on page 4-29.
When Driving
i-ACTIVSENSE
4-117