Page 179 of 426
177 Controls in detail
Audio system
Item
Page
1
CD changer mode selector
AUX mode selector
193
183
2
Single CD mode selector
195
3
Radio mode selector
4
Mute function (radio)
187
Pause (CD)
199
5
Volume distribution
181
6
Sound settings
179
7
Display
8
Alphanumeric keypad
Item
Page
9
Speed dialing memory
(telephone) in descending
order
a
Accepting a call
(telephone)
205
b
Telephone mode selector
200
c
Speed dialing memory
(telephone) in ascending
order
201
d
Terminating a call
(telephone)
205
e
CD slot
f
CD ejection
195
Item
Page
g
Soft keys
178
h
Volume
179
j
Switching on/off
178
k
Manual tuning / seek
tuning (radio)
185
Track search, reverse (CD)
198
l
Manual tuning / seek
tuning (radio)
185
Track search,
fast forward (CD)
198
Page 180 of 426
178 Controls in detailAudio systemButton and soft key operation
In these instructions, the alphanumeric
keypad (right side of radio panel) and the
function buttons (left side of radio panel)
are referred to as “buttons”. The four keys
below the display panel are referred to as
“soft keys”.
Operation
Switching the unit on/off
Switching on
Turn the SmartKey in the starter switch
to position1 or2.
If the audio system was on as you
removed the SmartKey from the starter
switch, the audio system will
automatically come back on as you
turn the SmartKey to position1 or2.
or
Press M button.
!Do not press directly in the display
face. Otherwise, the display will be
damaged.
iIf the radio is switched on without the
key in the starter switch, it will
automatically switch off again after
approx. 30 minutes.
If your vehicle is equipped with a
telephone, the display may prompt you
to enter your PIN (GSM network) or
code (TDMA or CDMA network).
Page 181 of 426

179 Controls in detail
Audio system
Switching off
Remove SmartKey from starter switch.
or
Press M button.
Adjusting the volume
Turn rotary control of N button.
The volume will increase or decrease
depending on the direction turned.Adjusting sound functions
The bass and treble functions are called up
by pressing the O button.
Settings for bass and treble are stored
separately for the AM and FM wavebands,
weather band, CD mode and telephone
mode.
Bass
Press O button repeatedly until BASS
appears in the display.
Press
+ or
– soft key to increase or
decrease tone level accordingly.
or
Press
RES
soft key briefly to reset bass
tones to their center level.
The radio switches back to the
standard radio menu eight seconds
after the last soft key is pressed.
iShould excessively high temperatures
occur while the audio system is being
operated, the display will dim. If tem-
peratures continue to rise,
HIGH TEMP
will appear in the display, after which
the audio system will be switched off
for a cooling-down period.
iIf your vehicle equipment includes a
Mercedes-Benz specified mobile
telephone*, you can adjust its volume
separately from the volume of the
audio system while the telephone is
being used.
Page 182 of 426

180 Controls in detailAudio systemAdjusting treble
Press O button repeatedly until TREBLE
appears in the display.
Press
+ or
– soft key to increase or
decrease tone level accordingly.
or
Press
RES
soft key briefly to reset treble
tones to their center level.
The radio switches back to the
standard radio menu eight seconds
after the last soft key is pressed.Sound system*
You can either program the sound settings
manually (
page 179) or choose settings
via preset sound characteristics.
You can select from among the following
settings:
STANDARD
: conventional stereo sound.
SURROUND
: the sound is set for better
three-dimensional acoustic character-
istics.
SPEECH
: the sound is optimized for the
spoken word.
Press O button repeatedly until STANDARD
, SURROUND
or
SPEECH
appears
in the display.
Press X or Y soft key repeatedly
until the desired sound setting has
been reached.
The sound is set accordingly.
or
Press
RES
soft key briefly.
The sound setting is reset depending
on the sound source activated.
Radio mode:
STANDARD
CD/AUX mode:
SURROUND
Telephone:
SPEECH
The radio switches back to the
standard radio menu eight seconds
after the last soft key is pressed.
Page 183 of 426

181 Controls in detail
Audio system
Returning sound functions to factory
settings
Press O button to call up settings
menu in the display.
Press
RES
soft key briefly; the respec-
tive sound function is reset to its center
level.
or
Press and hold
RES
soft key until
RESET
appears in the display.
The sound settings for bass and treble
are returned to their center level and
the volume is set to a predefined level.Vehicles with sound system*:
The sound setting is reset depending
on the sound source activated.
Radio mode:
STANDARD
CD/AUX mode:
SURROUND
Telephone:
SPEECH
The radio switches back to the
standard radio menu four seconds
after the last soft key is pressed.
Adjusting volume distribution
Call up fader and balance functions by
pressing the P button.
Fader
Press P button repeatedly until FADER
appears in the display.
Press V or W soft key.
The volume is distributed accordingly
between the front and rear of the
vehicle.
or
Press
RES
soft key briefly.
The fader is reset to its center level.
The radio switches back to the
standard radio menu eight seconds
after the last soft key is pressed.
Page 184 of 426

182 Controls in detailAudio systemAdjusting balance
Press P button repeatedly until BALANCE
appears in the display.
Press X or Y soft key.
The volume is distributed between the
left and right sides of the vehicle.
or
Press
RES
soft key briefly.
The balance is reset to its center level.
The radio switches back to the
standard radio menu eight seconds
after the last button is pressed.Returning volume distribution to
factory settings
Press P button to call up settings
menu in the display.
Press
RES
soft key briefly; the
respective volume distribution is reset
to its center (flat) level.
or
Press and hold
RES
soft key until
RESET
appears in the display.
The volume distribution settings for
fader and balance are set to their
center level.
The radio switches back to the
standard radio menu four seconds
after the last soft key is pressed.
Telephone* muting
If your vehicle equipment includes a
Mercedes-Benz specified mobile
telephone*, you can adjust its volume
separately from the volume of the audio
system while the telephone is being used.
Page 185 of 426

183 Controls in detail
Audio system
Connecting an external audio source
(AUX) to the radio*
An optional dealer-installed cinch-connec-
tor* for connecting an external audio
source may become available for your
vehicle model. Feature description is
based on preliminary information at time
of printing. Contact an authorized
Mercedes-Benz Center for availability.
You can adjust the volume (
page 179),
the sound settings (
page 179) and the
volume distribution (page 181) for the
AUX input.
Calling up AUX mode
Press and hold Q button until AUX
appears in the display.
Canceling AUX mode
Press any audio source button.
Radio operation
Selecting radio mode
Press b button.
Calling up wavebands
You can choose from among the FM, AM
and WB wavebands.
Weather band (
page 187).Calling up wavebands for radios
without SAT
Press
FM or
AM soft key to switch
between FM and AM.
The FM and AM wavebands are called
up one after another.
or
Press
WB soft key.
The weather band menu is called up.
The waveband currently selected
appears in the upper left-hand corner
of the display.
iFM waveband: 87.7......107.9 MHz
AM waveband: 530......1 710 KHz
Page 186 of 426
184 Controls in detailAudio systemCalling up wavebands for radios
with SAT
Press
FM, AM or
WB soft key repeatedly
until desired waveband has been
selected.
The FM, AM and WB wavebands are
called up one after another.
The waveband currently selected
appears in the upper left-hand corner
of the display.Selecting a station
The following options are available for
selecting a station:
Direct frequency input (
page 184)
Manual tuning (
page 185)
Automatic seek tuning (
page 185)
Scan search (
page 185)
Station memory (
page 186)
Automatic station memory (Autostore)
(page 186)
The station search proceeds in the
following frequency increments:
200 kHz in FM range
10 kHz in AM rangeDirect frequency input
Select desired waveband.
Press * button.
Enter desired frequency with
buttons1to R.