2003 Mercedes C-Class Owner's Manual - Page 170

Controls in detail Audio system Balance In radio, cassette and CD mode, press the AUD key repeatedly until BALANCE appears on the display. Returning audio functions to factory settings Audio system sound selection (EXT)* In radio, cassette and CD mode, press the AUD key. The sound settings menu appears on the display. In radio, cassette and CD mode, press and hold the AUD key longer than two seconds. RESET will appear on the display. All settings for bass, treble and balance are returned to center and the volume is set to a predefined level. Press the EXT key. Press the L or R key to shift the sound accordingly. or Press both the L and R keys simultaneously to reset the balance to its center level. Press one of the function keys. You can select from among the following settings: DRV: The tone level is set to the "Driver" position, sound is directed toward the passengers. 170