Mazda CX-9 2019 Owner's Manual page 292

When Driving
i-ACTIVSENSE
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 radar sensor (rear) on the vehicle has

occurred.
There is a large accumulation of snow or ice on the rear bumper near a radar sensor

(rear).
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 radar sensors (rear) cannot detect target objects or it

may be difficult to detect them.
The vehicle speed when reversing is about 10 km/h (6 mph) or faster.

The radar sensor (rear) 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.)
A vehicle is approaching directly from the rear of your vehicle.

The vehicle is parked on a slant.

Directly after the Blind Spot Monitoring (BSM) system becomes operable using the

personalization feature.
Radio wave interference from a radar sensor equipped on a nearby parked vehicle.

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