For 1990-2009 cars

Radio controls are located on the right side of the steering wheel. If your vehicle has this feature, some audio controls can be adjusted at this location. They include the following:

+ - (Volume): Press the plus or minus button to increase or to decrease the volume.
(Previous/Next) : Press the arrows to go to the previous or to the next stored radio station and stay there. Press and hold the arrows briefly to advance to the previous or to the next station with a strong signal in the selected band. When a CD is playing, press the arrows to go to the previous or to the next track. Press and hold the arrows briefly to continue reversing back or advancing ahead to other tracks within the disc.
(Mute/Voice Activation): Press this button to silence the system. Press this button again to turn the sound on. If your vehicle has OnStar®, press and hold this button for two seconds to activate voice on the OnStar® system. See the OnStar® System in this manual for more information.