If the Smart City Brake Support (SCBS) is operating, the indicator light (red) flashes.

Smart City Brake Support (SCBS)
Collision WarningMazda 6 Owners Manual: Driving In Flooded Area
WARNING
Dry off brakes that have become wet by driving slowly, releasing the accelerator
pedal and lightly applying the brakes several times until the brake performance
returns to normal: Driving with wet brakes is dangerous. Increased stopping
distance or the vehicle pulling to one side when ...
Mazda 6 Owners Manual: Operation
NOTE
The engine may not start and security indicator light may illuminate
or flash if the key is placed in an area where it is difficult for the system
to detect the signal, such as on the dashboard or in the glove compartment.
Move the key to a location within the signal range, switch ...