2003 Mercedes C-Class Owner's Manual - Page 172

Controls in detail Audio system Direct frequency input (AM and FM only) Select the desired frequency band. Manual tuning Select the desired band. Automatic seek tuning Select the desired frequency band. Press the " button. Enter the desired frequency with the buttons 1 to 0. 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. Afterward, the radio will be muted and high-speed tuning will take place until the button is released. Press either the f or e button. The radio will tune to the next receivable station at a higher or lower 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 last tuned station. 172