Honda Ridgeline Owner's Manual page 180

Playing the XM Radio
Depending on where you drive, you
may experience reception problems.
Interference can be caused by any of
these conditions:
Driving on the north side of an
east/west mountain road.
Driving on the north side of a
large commercial truck on an
east/west road.
Driving in tunnels.
Driving on a road beside a vertical
wall, steep cliff, or hill to the south
of you.
Driving on the lower level of a
multi-tiered road.
Driving on a single lane road
alongside dense trees taller than
50 ft. (15 m) to the south of you.
Large items carried on a roof rack.
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There may be other geographic
situations that could affect XM Radio
reception.
As required by the FCC:
Changes or modifications not expressly
approved by the party responsible for
compliance could void the user's
authority to operate the equipment.
This Category II radiocommunication
device complies with Industry Canada
Standard RSS-310.
Operation is subject to the following two
conditions: (1) this device may not cause
interference, and (2) this device must
accept any interference, including
interference that may cause undesired
operation of the device.
Receiving XM Radio Service
If your XM Radio service has expired
or you purchased your vehicle from
a previous owner, you can listen to a
sampling of the broadcasts available
on XM Radio. With the ignition
switch in the ACCESSORY (I) or ON
(II) position, push the PWR button to
turn on the audio system and press
the XM button. A variety of music
types and styles will play.