Mazda CX-9 2019 Owner's Manual page 276

When Driving
i-ACTIVSENSE
When there is a difference in the height between your driving lane and the adjacent

lane.
Directly after the BSM system becomes operable by changing the setting.

If the road width is extremely narrow, vehicles 2 lanes over may be detected. The detection

area of the radar sensors (rear) is set according to the road width of expressways.
The BSM warning indicator light may turn on and the vehicle detection screen may be

displayed in the display in reaction to stationary objects (guardrails, tunnels, sidewalls,
and parked vehicles) on the road or the roadside.
Objects such as guardrails and concrete walls
running alongside the vehicle.
A BSM warning indicator light may flash or the warning beep and the warning screen

indicator display may be activated several times when making a turn at a city
intersection.
Turn off the BSM 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 difficult to view the illumination/flashing of the BSM

warning indicator 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 radar sensors (rear) of the BSM may be regulated under the radio 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 BSM is
driven in a country other than the U.S.A., Canada, or Mexico, the system has to be turned
off using the BSM OFF switch.
The system switches to the Rear Cross Traffic Alert function when the selector lever is

shifted to the reverse (R) position.
Refer to Rear Cross Traffic Alert (RCTA) on page 4-130.
4-116
Places where the width between guardrails or
walls on each side of the vehicle narrows.
The walls at the entrance and exits of tunnels,
turnouts.