Mazda 3 2016 Manual page 216

When Driving
i-ACTIVSENSE
If the road width is extremely narrow, vehicles two lanes over may be detected.
The detection area of the radar sensors (rear) is set according to the road width of
expressways.
The Blind Spot Monitoring (BSM) warning lights may turn on in reaction to stationary
objects on the road or the roadside such as guardrails, tunnels, sidewalls, and parked
vehicles.
Objects such as guardrails and concrete walls
running alongside the vehicle.
A Blind Spot Monitoring (BSM) warning light may ash or the warning beep may be
activated 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 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 dif cult to view the illumination/ ashing of the Blind
Spot Monitoring (BSM) warning 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 system switches to the Rear Cross Traf c Alert function when the shift lever (manual
transaxle) or the selector lever (automatic transaxle) is shifted to the reverse (R) position.
Refer to Rear Cross Traf c Alert (RCTA) on page 4-92 .
4–88
The walls at the entrance and exits of tunnels,
turnouts.
Places where the width between guardrails or
walls on each side of the vehicle narrows.