Mazda CX-5 2018 Owner's Manual page 424

Anything which generates ultrasound is near the vehicle, such as another vehicle's
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horn, the engine sound of a motorcycle, the air brake sound of a large-sized vehicle, or
another vehicle's sensors.
The vehicle is driven in heavy rain or in road conditions causing water-splash.
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A commercially-available wing pole or an aerial for a radio transmitter is installed to
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the vehicle.
The vehicle is moving towards a tall or square curbstone.
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An obstruction is too close to the sensor.
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Obstructions under the bumper may not be detected. Obstructions that are lower than the
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bumper or thin which may have been initially detected may no longer be detected as the
vehicle approaches more closely to the obstruction.
The following types of obstructions may not be detected:
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Thin objects such as wire or rope
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Things which absorb sonic waves easily such as cotton or snow
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Angular shaped objects
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Very tall objects, and those which are wide at the top
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Small, short objects
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Always have the system inspected at an expert repairer, we recommend an Authorised
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Mazda Repairer if any shock is applied to the bumpers, even in a minor accident. If the
sensors are deviated, they cannot detect obstructions.
The system may have a malfunction if the beep does not operate or the indicator light
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does not illuminate when the park assist sensors switch is turned on. Consult an expert
repairer, we recommend an Authorised Mazda Repairer.
The system may have a malfunction if the beep sound which indicates a system
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malfunction is heard and the indicator light flashes. Consult an expert repairer, we
recommend an Authorised Mazda Repairer.
The beeper which indicates a system malfunction may not be heard if the ambient
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temperature is extremely cold, or mud, ice, or snow adheres to the sensor area. Remove
any foreign material from the sensor area.
When installing a trailer hitch, consult an expert repairer, we recommend an Authorised
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Mazda Repairer.