2005 Mercedes C-Class Owner's Manual - Page 192

Controls in detail Audio system Adjusting balance Press P button repeatedly until BALANCE appears in the display. Returning volume distribution to factory settings Press P button to call up settings menu in the display. or Press and hold RES soft key until RESET appears in the display. The volume distribution settings for fader and balance are set to their center level. Press X or Y soft key. The volume is distributed between the left and right sides of the vehicle. or Press RES soft key briefly. The balance is reset to its center level. The radio switches back to the standard radio menu eight seconds after the last button is pressed. The radio switches back to the standard radio menu four seconds after the last soft key is pressed. Telephone* muting If your vehicle equipment includes a Mercedes-Benz specified mobile telephone*, you can adjust its volume separately from the volume of the audio system while the telephone is being used. Press RES soft key briefly; the respective volume distribution is reset to its center (flat) level. 190