2010 Mercedes C-Class Owner's Manual - Page 146

144 Audio system the frequency range. Frequencies within the current frequency range, but outside the current frequency step width are rounded to the next lower allowed frequency. X X Switching on: Press push button q. Open the audio display cover. If the audio system was on as you switched off the ignition, turn the SmartKey in the starter switch to position 1. The audio system will come back on with the last selected function. or X or X Controls in detail Enter 1045 with the keypad on the audio control unit. The audio system tunes in to the frequency entered. Operation In the following description, an operation step is described as in the example below. X i If the audio system is switched on without the SmartKey in the starter switch, it will automatically switch off again after approximately 30 minutes. X $ Q Radio Q Enter Frequency is the short for X Press button $ on audio control unit repeatedly until desired wave band has been selected. X Slide VÆ. X Slide XV or rotate cVd the audio controller to select Radio. X Press the audio controller W. The Radio menu is selected and a list of submenus appears. X Slide ZV or rotate cVd the audio controller to select Enter Frequency. X Press the audio controller W. The Enter Frequency submenu appears in the audio display. Switching off: Press push button q. Turn the SmartKey in the starter switch to position 0 and remove SmartKey from starter switch. or X i Should excessively high temperatures occur while the audio system is being operated, Temperature Too High Device switching off now. will appear in the audio display, after which the audio system will be switched off for a coolingdown period. i When you switch off the audio system, you also switch off the currently playing audio source. Also, telephone operation via the audio control unit is not possible. Adjusting volume Switching audio system on or off