2009 GMC Acadia Owner's Manual - Page 488

Navigation Audio System Notice: Before adding any sound equipment to the vehicle, such as an audio system, CD player, CB radio, mobile telephone, or two-way radio, make sure that it can be added by checking with your dealer/ retailer. Also, check federal rules covering mobile radio and telephone units. If sound equipment can be added, it is very important to do it properly. Added sound equipment can interfere with the operation of the vehicle's engine, radio, or other systems, and even damage them. The vehicle's systems can interfere with the operation of sound equipment that has been added. Notice: The chime signals related to safety belts, parking brake, and other functions of the vehicle operate through the navigation system. If that equipment is replaced or additional equipment is added to the vehicle, the chimes may not work. Make sure that replacement or additional equipment is compatible with the vehicle before installing it. See "Accessories and Modifications" in the Index of the vehicle's owner manual. Playing the Radio O (Power/Volume): • Press to turn the audio system on and off. • Turn to increase or to decrease the volume. • Press and hold for more than two seconds to turn off the navigation system, the Rear Seat Entertainment (RSE) video screen, and Rear Seat Audio (RSA). If the vehicle has not been turned off, the RSE and the RSA can be turned back on by pressing this knob. The last active source resumes playing. f (Tuning Knob): • Turn to go to the next or previous frequency. • Press to go to the Sound menu. AUDIO: • Press to display the audio screen. • Press to switch between AM, FM, or XM (if equipped), DISC, or AUX (Auxiliary), or select the screen button. See CD Player on page 3-10, DVD Player on page 3-16, or Auxiliary Devices on page 3-22 for more information. 3-2