2003 GMC Envoy Owner's Manual - Page 231

Audio Steering Wheel Controls If your vehicle has this feature, certain radio functions can be operated by using the controls on your steering wheel. DVD Distortion You may experience audio distortion in the IR headphones when operating cellular phones, scanners, CB radios, Global Positioning Systems (GPS)", two-way radios, mobile fax, or walkie talkies. It may be necessary to turn off the DVD player when operating one of these devices in or near thevehicle. * Excludes the Onstar@ System. Understanding Radio Reception AM AM/FM: Press this button to switch between AM, FM1 and FM2. When playing a cassette tape or compact disc, press this button to listen to the radio. The range for most AM stations is greater than for FM, especially at night. The longer range, however, can cause stations to interfere with each other. AM can pick up noise from things like storms and power lines. Try reducing the treble to reduce this noise if you ever get it. 0~~~ (Program): Press this button to tune to the next preset radio station. When playing a cassette tape, press this button to play the other side of the tape. When using the CD changer, this button will seek to the next track. (Volume): Press the up or the down arrow to increase or to decrease volume. FM FM stereo will give you the best sound, but FM signals will reach only about 10 to 40 miles (16 to 65 km). Tall buildings or hills can interfere with FM signals, causing the sound to come and go. 3-106