2003 GMC Envoy Owner's Manual - Page 188

Audio System(s) Notice: Before you add any sound equipment to your vehicle - like a tape player, CB radio, mobile telephone or two-way radio - be sure you can add what you want. If you can, it's very important to do it properly. Added sound equipment may interfere with the operation of your vehicle's engine, Delphi Electronics radio or other systems, and even damage them. Your vehicle's systems may interfere with the operation of sound equipment that has been added improperly. Setting the Time Your radio may have a button marked with an H or HR to represent hours and an M or MIN to represent minutes. Press and hold the hour button until the correct hour appears on the display. AM or PM will also appear on the display. Press and hold the minute button until the correct minute appears on the display. The time may 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 instead. RDS time is broadcast once a minute. Once you have tuned to an RDS broadcast station, it may take a few minutes for your time to update. So, before adding sound equipment, check with your dealer and be sure to check federal rules covering mobile radio and telephone units. Your audio system has been designed to operate easily and to give years of listening pleasure. You will get the most enjoyment out it if you acquaint yourself with it of first. Find out what your audio system can do and how to operate all of its controls to be sure you're getting the most outof the advanced engineering that went into it. Your vehicle has a feature called Retained Accessory Power (RAP). With RAP, you can play your audio system even after the ignition is turned off. See "Retained Accessory Power (RAP)" under Ignition Positions on page 2-79. 3-63