y / c z (Previous/Next): Press to go to theprevious or the next radio station stored as a favorite.When a CD is playing, press either arrow to go tothe previous or to the next track.Press c z to end an OnStar Hands-Free Call.+ e − e (Volume): Press to increase or to decreasethe radio volume.b g (Mute/Voice Recognition): Press and release tosilence the vehicle speakers only. The audio of thewireless and wired headphones, if the vehicle has thesefeatures, does not mute. Press and release this buttonagain, to turn the sound on.If the vehicle has the navigation system, press and holdthis button for longer than one second to initiatevoice recognition. See “Voice Recognition” in theNavigation System manual for more information.If the vehicle has OnStar® , press and hold this buttonfor longer than one second to interact with the OnStar®system. If your vehicle also has the navigation system,press and hold this button for longer than one second toinitiate voice recognition and say “OnStar” to enterOnStar® mode. See the OnStar® System on page 2-43.Radio ReceptionFrequency interference and static can occur duringnormal radio reception if items such as cell phonechargers, vehicle convenience accessories, and externalelectronic devices are plugged into the accessorypower outlet. If there is interference or static, unplug theitem from the accessory power outlet.AMThe range for most AM stations is greater than for FM,especially at night. The longer range can causestation frequencies to interfere with each other.For better radio reception, most AM radio stationsboost the power levels during the day, and then reducethese levels during the night. Static can also occurwhen things like storms and power lines interfere withradio reception. When this happens, try reducing thetreble on the radio.FM StereoFM signals only reach about 10 to 40 miles(16 to 65 km). Although the radio has a built-in electroniccircuit that automatically works to reduce interference,some static can occur, especially around tall buildings orhills, causing the sound to fade in and out.3-91
