GMC 2009 Sierra - Manual (Page 255)

P (Power): Press this button to turn the RSA on
or off.
Volume: Turn this knob to increase or to decrease the
volume. The left knob controls the left headphones
and the right knob controls the right headphones.
SRCE (Source): Press this button to switch between
the radio (AM/FM), XM™ (if equipped), CD, and if
your vehicle has these features, DVD, front auxiliary,
and rear auxiliary.
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(Seek): When listening to FM, AM, or XM™
(if equipped), press either seek arrow to go to the
previous or to the next station or channels and stay
there. This function is inactive, with some radios, if the
front seat passengers are listening to the radio.
Press and hold either seek arrow until the display
flashes, to tune to an individual station. The display
stops flashing after the buttons have not been pushed
for more than two seconds. This function is inactive, with
some radios, if the front seat passengers are listening
to the radio.
While listening to a disc, press the left seek arrow
to go back to the start of the current track or chapter
(if more than ten seconds have played). Press the right
seek arrow to go to the next track or chapter on the
disc. This function is inactive, with some radios, if the
front seat passengers are listening to the disc.
When a DVD video menu is being displayed, press
either seek arrow to perform a cursor up or down on the
menu. Hold either seek arrow to perform a cursor left
or right on the menu.
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