HONDA Backup Sensors 08V67-S9V-1000-81 - Manual (Page 8)

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Limitations
The sensors may not sound for the following
obstacles or under the following conditions:
• Objects low in height such as curbstone, etc.
• Piece of wire, rope, and net fence
• Objects that absorb ultrasonic waves, such as
soft snow, cotton and sponges
• Droplets of water frozen on the sensor
The audible signal may sound warning even if
there is no obstacle behind the vehicle.