2003 GMC Sierra 1500 Pickup Owner's Manual - Page 277

Audio Steering Wheel Controls You can control certain radio functions using the buttons on your steering wheel. PROG (Program): Press this button to play a station you have programmed on the radio preset pushbuttons on the selected band. If a cassette tape is playing, press this button to play the other side of the tape. If a CD is playing, press this button to go to the next available CD. SOURCE : Press this button to select AM, FMI, FM2, or XMI or XM2, (if your vehicle is equipped with the XMTMSatellite Radio Service), or DAB1 or DAB2 (if your vehicle is equipped with DAB), or a cassette tape or CD. The cassette or CD must be loaded to play. Available loaded sources are shown on the display as a tape or a CD symbol. SEEK Press the up or the down arrow to seek to the next or to the previous radio station and stay there. A A v: ((I? (OnStarNoice Recognition): If your vehicle has Onstar@,you can press this button to interact with the Onstar@system. See the Onstar@ manual provided with your vehicle for more information. IF your vehicle does not have Onstar@,pressing this button will mute the audio system. V O L V : Press the up or the down arrow to increase or to decrease volume. A 3-122