The audio steering wheel controls could be different depending on your vehicles options. Some audio controls can be adjusted at the steering wheel. They include the following:

(Next/Previous): Press the down or up arrow to go to the next or to the previous preset radio station. When a CD is playing, press the down or up arrow to go to the next or previous track.

(Mute/Voice Recognition): Press this button to silence the system. Press this button again or turn the volume knob to turn the sound on. Press and hold this button to interact with the OnStar® system. If your vehicle is also equipped with the navigation system, push this button to initiate voice recognition and say, "OnStar" to enter OnStar® mode, see the OnStar® System in this manual for more information. If your vehicle has the navigation system, press this button to initiate voice recognition. See "Voice Recognition" in the index of your vehicle's navigation system manual for more information.

SRCE (Source): Press this button to switch between AM, FM, or XM (if equipped), radio, or CD.

+  - (Volume): Press the plus or minus button to increase or to decrease the volume.

(Seek): Press the seek arrow to go to the next radio station and stay there. The system only seeks radio stations with strong frequencies. When the seek arrow is pressed and held for two seconds, the system scans the radio stations that are in the selected band. If listening to a CD, the system advances to the next CD when multiple discs are inserted.

If you have the navigation system, some of the audio steering wheel controls work when a DVD is playing in the navigation radio. See the Navigation System manual for more information.