Mazda 3 2019 Owner's Manual page 297

Do not apply a strong force to a rear
ultrasonic sensor and rear camera:
When washing the vehicle, do not spray
highly pressurized water against a rear
ultrasonic sensor and rear camera, or rub it
strongly. In addition, do not hit the rear
bumper forcefully when loading and
unloading cargo Otherwise, the sensors
may not detect obstructions correctly
which could cause the SBS-R system to not
operate normally, or it could operate
unnecessarily.
CAUTION
When driving off-road in areas where
there is grass or foliage, it is
recommended that the SBS-R system be
turned off.
Always use tires of the specified size and
the same manufacturer, brand, and
tread pattern on all 4 wheels. In addition,
do not use tires with significantly
different wear patterns on the same
vehicle. Otherwise, the SBS-R system may
not operate normally.
If ice or snow is stuck on the rear
ultrasonic sensor and rear camera they
may not be able to detect obstructions
correctly depending on the conditions. In
such cases, the system may not be able
to perform controls correctly. Always
drive carefully and pay attention to the
rear of the vehicle.
i-ACTIVSENSE
NOTE
The vehicle posture changes depending

on the accelerator pedal, brake pedal
and steering wheel operations, which
could make it difficult for the system to
recognize an obstruction, or it could
facilitate unnecessary detection. In such
cases, the SBS-R may or may not
operate.
The SBS-R system will operate under the

following conditions.
The engine is running.

The shift lever (manual transmission

vehicle) or the selector lever
(automatic transmission vehicle) is in
the R (reverse) position.
The slope is less than 5 %.

i-ACTIVSENSE warning indication/

warning light is not displayed in the
multi-information display.
The vehicle speed is between about 2

to 8 km/h (2 to 4 mph).
The SBS-R is not turned off.

The DSC is not malfunctioning.

In the following cases, the rear

ultrasonic sensor and rear camera
cannot detect obstructions and the
SBS-R may not operate.
The height of the obstruction is low

such as low walls or trucks with low
loading platforms.
The height of the obstruction is high

such as trucks with high loading
platforms.
The obstruction is small.

The obstruction is thin such as a

signpost.
The surface of the obstruction is not

pointed vertically relative to the
vehicle.
When Driving
4-157