2004 Mercedes C-Class Owner's Manual - Page 180

Controls in detail Audio system Direct frequency input Select the desired frequency band. Manual tuning Select the desired frequency band. Automatic seek tuning Select the desired frequency band. Press " button. Enter desired frequency using buttons 4 to M. Press and hold either the d or c button until the desired frequency is reached. Step-by-step station tuning takes place in ascending or descending order of frequency. The first three tuning steps will take place without muting. Afterwards, the radio will be muted and highspeed tuning will take place until the button is released. Press either the f or e button. The radio will tune to the next higher or next lower receivable frequency. i You can only enter frequencies within the respective waveband. If a button is not pressed within four seconds, the radio will return to the station last tuned to. 180