Mazda 3 2018 Owner's Manual page 261

The SBS system may not operate under the following conditions:

If the vehicle is accelerated rapidly and it comes close to a vehicle ahead.

The vehicle is driven at the same speed as the vehicle ahead.

The accelerator pedal is depressed.

The brake pedal is depressed.

The steering wheel is being operated.

The selector lever is being operated.

The turn signal is being used.

When the vehicle ahead is not equipped with taillights or the taillights are turned off.

When warnings and messages, such as a dirty windshield, related to the Forward

Sensing Camera (FSC) are being displayed in the center display.
Although the objects which activate the system are four-wheeled vehicles, the radar

sensor (front) could detect the following objects, determine them to be an obstruction, and
operate the SBS system.
Objects on the road at the entrance to a curve (including guardrails and snow banks).

A vehicle appears in the opposite lane while cornering or rounding a curve.

When crossing a narrow bridge.

When passing under a low gate or through a tunnel or narrow gate.

When entering an underground parking area.

Metal objects, bumps, or protruding objects on the road.

If you suddenly come close to a vehicle ahead.

When driving in areas where there is high grass or forage.

Two-wheeled vehicles such as motorbikes or bicycles.

Pedestrians or non-metallic objects such as standing trees.

When the system operates, the user is notified by the active driving display.

The SBS warning indication (amber) turns on when the system has a malfunction.

Refer to Warning Lights on page 4-24.
Mazda3_8GE4-EA-17F_Edition1
When Driving
i-ACTIVSENSE
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2017-4-7 11:59:21