Honda Odyssey 2009 Owner's Manual page 370

Parking Sensor System
Within about 20 in (50 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 20 in (50 cm) or closer.
The rear center sensor senses an
obstacle that is behind your vehicle
70 in (1.8 m) or closer.
Do not put any accessories on or
around the sensors.
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Within about 70 in (1.8 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.
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.
Canadian Owners:
This device complies with Industry
Canada Standard RSS-210. Operation is
subject to the following two conditions:
(1) this device may not cause
interference, and (2) this device must
accept any interference that may cause
undesired operation of the device.
This ISM device complies with Canadian
ICES-001.