2005 GMC Envoy Owner's Manual - Page 198

Audio System(s) Notice: Before adding any sound equipment to your 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. 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 may interfere with the operation of your vehicle's engine, radio, or other systems, and even damage them. Your vehicle's systems may interfere with the operation of sound equipment that has been added. Notice: The chime signals related to seat belts, parking brake, and other functions of your vehicle operate through the GM radio/entertainment system. If that equipment is replaced or additional equipment is added to your vehicle, the chimes may not work. Make sure that replacement or additional equipment is compatible with your vehicle before installing it. Figure out which audio system is in your vehicle, find out what your audio system can do, and how to operate all of its controls. Your vehicle has a feature called Retained Accessory Power (RAP). With RAP, the audio system can be played even after the ignition is turned off. See Retained Accessory Power (RAP) on page 2-21 for more information. Setting the Time The radio may have a button marked with an H or HR to represent hours and an M or MN to represent minutes. Press and hold the hour button until the correct hour appears on the display. AM or PM will appear on the display for morning or evening hours. Press and hold the minute button until the correct minute appears on the display. The time can be set with the ignition on or off. To synchronize the time with an FM station broadcasting Radio Data System (RDS) information, press and hold the hour and minute buttons at the same time for two seconds until UPDATED and the clock symbol appear on the display. If the time is not available from the station, NO UPDAT will appear on the display. RDS time is broadcast once a minute. After tuning to an RDS broadcast station, it may take a few minutes for the time to update. 3-62