Acura 2010 RL - Manual (Page 282)

If you are listening to XM Radio, use
the CH button to change channels.
Each time you press the top (
) of
the button, the system goes to the
next preset channel. Press the
bottom (
) to go back to the
previous preset channel.
To select a different channel of the
category you are listening to, press
and hold the top (
) or bottom ( )
of the CH button until you hear a
beep.
On all models except Hawaiian
Remote Audio Controls
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2010 RL