Mercedes-Benz 2003 C 240 4MATIC Operator's Manual page 172

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