Mazda mx-5 2017 Owner's Manual page 208

When Driving
i-ACTIVSENSE
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 (6.3 mph) or faster.
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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.
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The vehicle is parked on a slant.
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Directly after pressing the Blind Spot Monitoring (BSM) switch and the system

becomes operable.
In the following cases, it may be difficult to view the illumination/flashing of the Blind

Spot Monitoring (BSM) warning lights equipped on the door mirrors.
Snow or ice adheres to the door mirrors.
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The door glass is fogged or covered in snow, frost or dirt.
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Turn off the Rear Cross Traffic Alert (RCTA) system while pulling a trailer or while an

accessory such as a bicycle carrier is installed to the rear of the vehicle. Otherwise,
the radio waves emitted by the radar will be blocked causing the system to not operate
normally.
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