BYD S1 EV User Manual page 152

152 4-5 Use of driver assistance functions
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Cotton, snow and other materials that absorb the radio waves;
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Objects with sharp edges and corners;
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Low obstacles;
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High obstacles that extend upward toward the direction of your car;
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Objects under the bumper;
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Objects close to the car;
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Persons in the vicinity of the car (depending on the type of clothing).
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If there is an image display on the multimedia display or a buzzer sound, it may
indicate that the sensor detects an obstacle or the sensor may be interfered with outer
factors. If this case persists, it is recommended to contact BYD Auto Authorized
Service Station for inspection.