Mazda 3 Owner's Manual page 200

Under the following conditions, the Smart City Brake Support (SCBS) system may not
operate normally.
Heavy luggage is loaded in the luggage compartment or on the rear seat.
When there is the possibility of partial contact with a vehicle or obstruction ahead.
When driving on continuously curving roads, entering and exiting curves, and unstable
driving due to a vehicle accident or breakdown in a driving lane.
Elongated luggage or cargo is loaded onto installed roof rails and covers the laser
sensor.
Exhaust gas from the vehicle in front, sand, snow, and water vapor rising from
manholes and grating, and water splashed into the air.
When towing a malfunctioning vehicle.
In the following cases, the laser sensor may inadvertently determine that there is a
vehicle ahead and the Smart City Brake Support (SCBS) system may operate.
Objects on the road at the entrance to a curve.
Vehicles passing in the opposite lane while making a curve.
Metal objects, bumps, or protruding objects on the road.
When passing through a toll gate.
When passing under a vinyl curtain or fl ag.
Plastic objects such as pylons.
Two-wheeled vehicles, pedestrians, animals or standing trees.
If the vehicle is driven with some of the tires having signifi cant wear, the system may not
operate correctly. If the tires are returned to a normal state and the Smart City Brake
Support (SCBS) indicator light still illuminates, have your vehicle inspected by an
Authorized Mazda Dealer.
When the system operates, the user is notifi ed by the fl ashing warning light and the active
driving display * .
The indicator light turns on when the system has a malfunction.
Refer to Warning Lights on page 4-22 .
When Driving
Brake
*Some models. 4–75