2009 GMC Acadia Owner's Manual - Page 249

Instrument Panel When a disc is playing in the CD or DVD changer, press PROG to select the next disc, if multiple discs are loaded. 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 PROG to perform the ENTER menu function. 3-127 x w (Next/Previous): Press the down or up arrows to go to the next or to the previous radio station stored as a favorite. When a CD/DVD is playing, press the down or up arrows to go to the next or previous track or chapter. > (Mute): Press this button to silence the system. Press this button again, or any other radio button, to turn the sound on. + / − x (Volume): Press the plus or minus volume buttons to increase or to decrease the volume. Rear Audio Controller (RAC) ©SEEK ¨: Press the SEEK arrows to go to the previous or to the next radio station while in AM, FM, or XM™ (if equipped). Press the SEEK arrows to go to the previous or to the next track or chapter while sourced to a CD or DVD slot. 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. Theft-Deterrent Feature THEFTLOCK® is designed to discourage theft of the vehicle's radio by learning a portion of the Vehicle Identification Number (VIN). The radio does not operate if it is stolen or moved to a different vehicle. The vehicle may have the Rear Audio Controller (RAC). Certain radio functions can be controlled with RAC.