Acura 2009 TL Owner's Manual page 240

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The XM satellites are in orbit over
the equator; therefore, objects south
of the vehicle may cause satellite
reception interruptions. To help
compensate for this, ground-based
repeaters are placed in major
metropolitan areas.
Satellite signals are more likely to be
blocked by tall buildings and
mountains the farther north you
travel from the equator. Carrying
large items on a roof rack can also
block the signal.
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.
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Playing the XM Radio (Models without navigation system)
Signal may be blocked by
mountains or large obstacles to
the south.
When DPLII is turned on (see page
231 ), sound coming from the rear
speakers may be distorted due to the
compression of the music being
broadcast. Turn DPLII off if this
happens.
Signal weaker in
these areas.
SATELLITE
2009 TL
GROUND REPEATER
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.
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