2008 MERCEDES-BENZ C300 Key go

177 Controls in detail
Audio system
Operating safetyAudio system components
With the audio system you can operate the
following main functions:

audio function with the radio, Sat*,
disc (CD audio or MP3 mode)

the telephone* with the phone book

various system settings
The audio system consists of the following:

audio control unit

audio display

audio controller with back and delete
button
In addition, the audio system can also be
operated with the multifunction steering
wheel (
page 152).
In these instructions, the keypad (right
side of audio control unit) and the function
buttons are referred to as “buttons”.Audio control unit
With the audio control unit you can:

switch the audio system on/off

adjust the volume

select the operating modes

enter telephone numbers and accept,
reject, initiate and end telephone calls

load and eject CDs
Warning!G
Any alterations made to electronic
components can cause malfunctions.
The radio, amplifier, CD changer*, satellite
radio*, and telephone* are interconnected.
When one of the components is not opera-
tional or has not been removed/replaced
properly, the function of other components
may be impaired.
This condition might seriously impair the
operating safety of your vehicle.
We recommend that you have any service
work on electronic components carried out
at an authorized Mercedes-Benz Center.

179 Controls in detail
Audio system
ItemPage
1Switching to radio mode196
Switching wavebands196
Switching to Sat* mode
2Switching to CD audio or
MP3 mode213
3Disc slot
Loading CDs
Ejecting CDs
Updating the map software
4Load/eject button214
5Clear button for deleting
digit or entire entries184
237
Entering a passcode228
Entering a telephone
number237
ItemPage
6Keypad
Tuning to a station via the
station memory197
Storing stations manually198
Entering a passcode228
Entering a telephone
number237
Sending DTMF tones240
CD changer*: Selecting CD217
7Tuning to a station via
station search197
Fast forward219
Selecting next track219
8Switching audio on/off188
9Setting the volume189
aTuning to a station via sta-
tion search197
Fast reverse219
Selecting previous track219
ItemPage
bConfirming a passcode228
Accepting a call239
Initiating a call237
Redial238
cRejecting a call239
Ending an active call238
dOpening system menu192
eSwitching sound on/off189
Switching hands-free
microphone on/off240
fSwitching to telephone
mode225
gSound settings189

187 Controls in detail
Audio system
Example of how to use the audio
system
Example: direct frequency input,
FM 104.5 MHz.
In the descriptions below, the mode always
serve as the starting point for locating the
individual menu items.
Example:
b

Radio
Enter Frequency
The individual steps for the above-men-
tioned example are described below.
Press buttonb on audio control
unit repeatedly until desired waveband
FM has been selected.
Switching to the menu bar:
Slidemr.
Selecting “Radio” in the menu bar:
Slideomor rotate ymz.
Confirming selection: Press n.
The
Radio menu is selected and a list of
submenus appears.
Selecting “Enter Frequency” in the
“Radio” menu: Slidemr.
Confirming selection: Press n.
The
Enter Frequency submenu ap-
pears.
Enter 1045 with the keypad on the au-
dio control unit.
The audio system tunes in to the
frequency entered.
iIt is not possible to enter a frequency in the
respective waveband which is outside the fre-
quency range. Frequencies within the current
frequency range, but outside the current fre-
quency step width are rounded to the next lower
allowed frequency.

188 Controls in detail
Audio system
Operation
In the following descriptions, an operation
step is described as in example below.
b
Radio
Enter Frequency
is the short for
Press buttonb on audio control
unit repeatedly until desired waveband
has been selected.
Slidemr.
Slideomor rotate ymz the audio con-
troller to select
Radio.
Press the audio controller n.
The
Radio menu is selected and a list of
submenus appears.
Slideqmor rotate ymz the audio con-
troller to select
Enter Frequency.
Press the audio controller n.
The
Enter Frequency submenu is
selected and appears in the audio
display.Switching audio system on or off
Rotary control/push buttono
1Push buttono
2Rotary control
Switching on: Press push
buttono.
or
Open the audio display cover.
or
If the audio system was on as you
switched off the ignition, turn the
SmartKey in the starter switch to
position2.The audio system will come back on
with the last selected function.
Switching off: Press push
buttono.
or
Turn the SmartKey in the starter switch
to position0.
iIf the audio system is switched on without
the SmartKey in the starter switch, it will
automatically switch off again after
approximately 30 minutes.
If your vehicle is equipped with a telephone*, the
audio display may prompt you to enter your PIN
(GSM network) or passcode (CDMA network).
iShould excessively high temperatures occur
while the audio system is being operated,
HIGH TEMP will appear in the audio display, after
which the audio system will be switched off for a
cooling-down period.
iWhen you switch off the audio system, you
also switch off the currently playing audio source
and the telephone* operating via audio control
unit is not possible.

197 Controls in detail
Audio system
Selecting a station/channel
You have the following selection options:

The station search function

The channel list
(Weather Band)

Station memory
(except Weather Band)

The manual frequency entry
(except Weather Band)
The station search proceeds in the
following frequency increments:

200 kHz in FM range

10 kHz in AM range
Tuning to a station/channel via
station/channel search function
Press buttonb on audio control
unit repeatedly until the FM/AM/WB
waveband is selected.
Slide omp or rotate ymz when the
main area in the basic menu is active.
Depending on the direction in which
the controller is being slid or rotated,
the system searches upward or down-
ward and stops at the next receivable
station/channel.
or
Press buttonG or H on audio
control unit.
Depending on the pressed button, the
system searches upward or downward
and stops at the next receivable
station/channel.Selecting a station using station
memory
Press b button on audio control
unit repeatedly until desired waveband
has been selected.
Select Presets.
or
Press n when the main area is
selected.
The memory menu appears. The dot R
in front of a memory position indicates
that the currently selected station is
saved there.
Select station in memory by rotating
ymz or sliding qmr and press n.
or
Press desired station button1 to
R, with the keypad in audio control
unit briefly.
iThe search function searches for the next
receivable station in the FM or AM waveband.
In Weather Band (WB) the search function
switches to the next channel in the channel list.
For tuning to a station/channel you can also use
the buttons on the multifunction steering wheel
(
page 159).
iThis function is not available for Weather
Band.

198 Controls in detail
Audio system
Tuning to a station by entering the fre-
quency manually
b
Radio
Enter Frequency
The menu for manual frequency entry
appears.
or
Press buttonó, on the keypad in
audio control unit briefly.
Enter frequency with keypad:
Enter desired frequency with
buttons1to R, with the keypad
in audio control unit briefly.
The audio system tunes in to the fre-
quency entered.
Exiting menu without making an en-
try: Press button í in the center
console (
page 184).Storing stations
You can store ten AM and ten FM stations
in the memory.
Storing stations manually with keypad
Tune in desired station.
Basic menu is shown in the audio
display.
Press and hold desired station
button1 to R until a brief signal
tone sounds.
The station is stored.
iThis function is not available for Weather
Band.
iIt is not possible to enter a frequency in the
respective waveband which is outside the fre-
quency range.
iIf you select a memory preset which is al-
ready in use, it will be overwritten by the new
station.

199 Controls in detail
Audio system
Storing stations manually with station
memory menu
Tune in desired station.
Basic menu is shown in the audio
display.
Press n when the main area is active.
or
Select Presets.
The station memory display appears in the
audio display.
The dot R in front of a memory position
indicates that the currently tuned station is
stored there.
Selecting a memory position:
Slideqmr or rotate ymz.
Storing a station to a selected mem-
ory position: Press and hold n until a
brief signal tone sounds.
or
Press and hold desired station
button1 to R on keypad, until a
brief signal tone sounds.
The station is stored.
Autostore – automatic station memory
Press b button on audio control
unit repeatedly until desired waveband
has been selected.Basic menu is shown in the audio
display.
Press n when the main area is active.
or
Select Presets.
The station memory display appears in the
audio display.
Slideqmr or rotate ymz to select Au-
tostore
.
Press n.
The audio system searches for receivable
stations. A corresponding message is dis-
played. The available stations are automat-
ically stored in memory. The first received
station will be automatically played.
Canceling storage procedure:
Pressn while the “Searching” mes-
sage is being displayed.
iThis function is not available for Weather
Band. The autostore function automatically as-
signs receivable stations to the memory, sorted
according to reception quality at the moment of
performing the autostore. The stations which
were stored in the station memory manually are
completely lost in this process. If less than ten
stations are found, the remaining entries are left
empty.

204 Controls in detail
Audio system
Tuning in channels
You have the following selection options:

The channel skip function

The manual channel number entry

The channel list

The channel presets
Tuning in channels using channel search
function
Slide omp or rotate ymz when the
main area in the basic menu is active.
Depending on the direction in which
the controller is being slid or rotated,
the system skips upward or downward
and stops at the next subscribed chan-
nel.
or
Press buttonG or H on audio
control unit.Depending on the pressed button, the
system searches upward or downward
and stops at the next receivable
channel.
Tuning in channels using manual chan-
nel number entry
b
Sat
Enter Channel.
The menu for manual channel number
entry appears.
or
Press buttonó, on the keypad in
audio control unit briefly.
Channel number entry with keypad:
Enter desired channel number with
buttons1to R, with the keypad
in audio control unit briefly.Further operation depends on whether the
selected channel number is valid or if the
channel is included in your subscription.
Exiting menu without making an
entry: Press buttoní in the center
console (
page 184).
Channel number is valid and channel is
included in subscription: The audio sys-
tem tunes in the channel entered.
Channel number is invalid: The message
Invalid Channel appears in the audio dis-
play.
Press n to close the message in the
audio display.
iWhich channels are available depends on
which channels you have subscribed to and the
program category you have selected
(
page 203). For tuning in channels you can
also use the buttons on the multifunction steer-
ing wheel (
page 159).