GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 323

To listen to an iPod or portable audio device through
the RSA, attach the iPod or portable audio device to the
front auxiliary input (if available), located on the front
audio system. Turn the iPod on, then choose the
front auxiliary input with the RSA SRCE button.
P (Power): Press this button to turn the RSA on
or off.
Volume: Turn the volume knob to increase or to
decrease the volume of the wired headphones. 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
the 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 the seek arrows 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 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.
While 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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