2010 GMC 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. 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. 4-146