GMC 2010 Sierra 1500 Crew Cab Owner's Manual page 370

The RSA functions can be used even while the main
radio is off. The front audio system will display the
headphone icon when the RSA is on, and will disappear
from the display when it is off.
Audio can be heard through wired headphones (not
included) plugged into the jacks on the RSA. If the
vehicle has this feature, audio can also be heard on
Channel 2 of the wireless headphones.
Depending on the audio system, the rear speakers may
continue to play when the RSA audio is active through
the headphones.
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.
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Press this button to turn the RSA on or off.
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.
Press this button to switch between
the radio (AM/FM), XM
vehicle has these features, DVD, front auxiliary, and
rear auxiliary.
(if equipped), CD, and if the