Mazda 3 Owner's Manual page 240

5–Door
Radar sensors
Always keep the bumper surface near the
radar sensor area clean so that the BSM
system operates normally.
Refer to Exterior Care on page 6-63
NOTE
The BSM OFF indicator light fl ashes
if the radar sensors cannot operate
normally. If the light remains fl ashing
after cleaning the bumper surface
near the radar sensor area, consult an
Authorized Mazda Dealer.
For repairs or paintwork around the
radar sensors, or replacement of the
bumper, consult an Authorized Mazda
Dealer.
Blind Spot Monitoring (BSM) System
When Driving
4–115