Mazda 6 Manual page 240

When Driving
i-ACTIVSENSE
Under the following conditions, the radar sensors (rear) cannot detect target objects or it may be
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difficult to detect them.
The vehicle speed when reversing is about 12 km/h (7 mph) or faster.
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The radar sensor (rear) detection area is obstructed by a nearby wall or parked vehicle.
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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
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operable.
In the following cases, it may be difficult to view the illumination/flashing of the Blind Spot
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Monitoring (BSM) warning lights equipped on the door mirrors.
Snow or ice adheres to the door mirrors.
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The front 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
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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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Your vehicle
Your vehicle
Your vehicle