Honda 2012 Pilot Owner's Manual page 497

Within about 24 in (60 cm)
The range of the corner sensors and
the rear center sensor are limited.
Each corner sensor is capable of
sensing an obstacle only when your
vehicle is 24 in (60 cm) or closer.
The rear center sensor senses an
obstacle that is behind your vehicle
43 in (1.1 m) or closer.
Do not put any accessories on or
around the sensors.
Within about 43 in (1.1 m)
The system may not function
properly under these conditions:
The sensors are covered with
snow, ice, mud, etc.
When the vehicle is on a rough
road, on grass, or on a hill.
After the vehicle has been sitting
out in hot or cold weather.
Parking Sensor System
When the system is affected by
some electrical equipment or
devices generating an ultrasonic
wave.
When operating the vehicle in bad
weather.
The system may not sense thin or
low objects, or sonic-absorptive
materials such as snow, cotton, or
sponge.
The system cannot sense objects
directly under the bumper.
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