Mazda 6 Manual page 231

In the following cases, the activation of the Blind Spot Monitoring (BSM) warning lights and the
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warning beep may not occur or they may be delayed.
A vehicle makes a lane change from a driving lane two lanes over to an adjacent lane.
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Driving on steep slopes.
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Crossing the summit of a hill or mountain pass.
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The turning radius is small (making a sharp curve, turning at intersections).
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When there is a difference in the height between your driving lane and the adjacent lane.
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Directly after pressing the Blind Spot Monitoring (BSM) switch and the system becomes
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operable.
If the road width is extremely narrow, vehicles two lanes over may be detected. The detection area
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of the radar sensors (rear) is set according to the road width of expressways.
Although the system may detect objects on the road side such as parked vehicles or guardrails and
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operate the warning light/beep, it does not indicate a malfunction.
A Blind Spot Monitoring (BSM) warning light may flash or the warning beep may be activated
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several times when making a turn at a city intersection.
Turn off the Blind Spot Monitoring (BSM) 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 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 Blind Spot
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Monitoring (BSM) warning lights equipped on the door mirrors.
Snow or ice is adhering 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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The radar sensors of the Blind Spot Monitoring (BSM) system may be regulated under the radio
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wave related laws of the country where the vehicle is driven. The sensors in this system are
approved for use in the U.S.A. (including territories), Canada, and Mexico. If a vehicle with a
Blind Spot Monitoring (BSM) system is driven in a country other than the U.S.A., Canada, or
Mexico, the system has to be turned off using the Blind Spot Monitoring (BSM) switch.
The system switches to the Rear Cross Traffic Alert function when the shift lever (manual
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transaxle) or the selector lever (automatic transaxle) is shifted to the reverse (R) position.
Refer to Rear Cross Traffic Alert (RCTA) on page 4-113.
When Driving
i-ACTIVSENSE
4-107