Mazda CX-5 2021 Owner's Manual page 335

The obstruction is small.
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The obstruction is thin such as a signpost.
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The obstruction is positioned away from the center of the vehicle.
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The surface of the obstruction is not pointed vertically relative to the vehicle.
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The obstruction is soft such as a hanging curtain or snow stuck to a vehicle.
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The obstruction is shaped irregularly.
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The obstruction is extremely close.
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In the following cases, the ultrasonic sensors (rear) cannot detect obstructions correctly
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and the SCBS R may not operate.
Something is stuck on the bumper near an ultrasonic sensor (rear).
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The steering wheel is turned sharply, or the brake or accelerator pedal is operated.
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There is another obstruction near one obstruction.
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During inclement weather such as rain, fog and snow.
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High or low humidity.
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High or low temperatures
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Strong winds.
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The path of travel is not flat.
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Heavy luggage is loaded in the luggage compartment or on the rear seat.
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Objects such as a wireless antenna, fog light, or illuminated license plate is installed
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near an ultrasonic sensor (rear).
The orientation of an ultrasonic sensor (rear) has deviated for reasons such as a

collision.
The vehicle is affected by other sound waves such as the horn, engine noise, ultrasonic
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sensor of another vehicle.
In the following cases, an ultrasonic sensor (rear) may detect something as a target

obstruction which could cause the SCBS R system to operate.
Driving on a steep slope.
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Wheel blocks.
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Hanging curtains, gate poles such as at toll gates and railroad crossing.
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When traveling near objects such as foliage, barriers, vehicles, walls, and fences along
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a road.
When driving off-road in areas where there is grass and forage.
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When passing through low gates, narrow gates, car washing machines, and tunnels.
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A towing bar is installed or a trailer is connected.
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When the system operates, the user is notified by the multi-information display.
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The Smart City Brake Support (SCBS) warning indication (amber) turns on when the

system has a malfunction.
Refer to Taking Action on page 7-33.
When Driving
i-ACTIVSENSE
4-179