Page 213 of 498

211 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 de-
crease tone level accordingly.
or
Press 
RES
 soft key briefly to reset bass 
tones to their center level.
The radio switches back to the stan-
dard 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 214 of 498

212 Controls in detailAudio systemAdjusting treble
Press O button repeatedly until TREBLE
 appears in the display.
Press 
+ or
– soft key to increase or de-
crease tone level accordingly.
or
Press 
RES
 soft key briefly to reset treble 
tones to their center level.
The radio switches back to the stan-
dard radio menu eight seconds after 
the last soft key is pressed.Sound system*
You can either program the sound settings 
manually (
page 211) 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 stan-
dard radio menu eight seconds after 
the last soft key is pressed. 
     
        
        Page 215 of 498

213 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 stan-
dard 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 vehi-
cle.
or
Press 
RES
 soft key briefly.
The fader is reset to its center level.
The radio switches back to the stan-
dard radio menu eight seconds after 
the last soft key is pressed. 
     
        
        Page 216 of 498

214 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 stan-
dard radio menu eight seconds after 
the last button is pressed.Returning volume distribution to facto-
ry settings
Press P button to call up settings 
menu in the display.
Press 
RES
 soft key briefly; the respec-
tive 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 cen-
ter level.
The radio switches back to the stan-
dard radio menu four seconds after the 
last soft key is pressed.
Telephone* muting
If your vehicle equipment includes a Mer-
cedes-Benz specified mobile telephone*, 
you can adjust its volume separately from 
the volume of the audio system while the 
telephone is being used. 
     
        
        Page 217 of 498

215 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 ve-
hicle model. Feature description is based 
on preliminary information at time of print-
ing. Contact an authorized Mercedes-Benz 
Center for availability.
You can adjust the volume (
page 211), 
the sound settings (
page 211) and the 
volume distribution (page 213) 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 219).Calling up wavebands for radios without 
SAT*
Press 
FM or 
AM soft key to switch be-
tween 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 218 of 498
216 Controls in detailAudio systemCalling up wavebands for radios with 
SAT*
Press 
FM, AM or 
WB soft key repeatedly 
until desired waveband has been se-
lected.
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 se-
lecting a station:
Direct frequency input (
page 216)
Manual tuning (
page 217)
Automatic seek tuning (
page 217)
Scan search (
page 217)
Station memory (
page 218)
Automatic station memory (Autostore) 
(page 218)
The station search proceeds in the follow-
ing frequency increments:
200 kHz in FM range
10 kHz in AM rangeDirect frequency input
Select desired waveband.
Press * button.
Enter desired frequency with buttons 
1to R. 
     
        
        Page 219 of 498

217 Controls in detail
Audio system
Manual tuning
Select desired waveband.
Press S or Tbutton for approx. 
three seconds.
Press button repeatedly until desired 
frequency has been reached.
Step-by-step station tuning takes place 
in ascending or descending order. Each 
time the button is pressed, the radio 
tunes further by 0.2 MHz. During man-
ual tuning, the radio is muted.Automatic seek tuning
Select desired waveband.
Press S or T button briefly.
The radio will tune to the next highest 
or next lowest receivable frequency.Scan search
Starting scan search
Select desired waveband.
Press 
SC soft key.
SC will appear in the display. The 
radio briefly tunes in all receivable 
stations on the waveband selected.
iYou can only enter frequencies within 
the respective waveband.
If a button is not pressed within 
four seconds, the radio will return to 
the last station tuned.
iIf no station is received after two 
consecutive scans of the complete 
frequency range, then the scan stops 
at the frequency from which it began. 
     
        
        Page 220 of 498
218 Controls in detailAudio system
Ending scan search
Press 
SC soft key or S or T.
The station last played will be se-
lected and 
SC disappears from the 
display.
Station memory
You can store ten AM and ten FM stations 
in the memory.
Storing stations
Tune in desired station.
Press and hold desired station 
button1 to R until a brief 
signal tone is heard.
The frequency is stored on the se-
lected station button.
Calling up stations
Press desired station button1 
to R briefly.
Autostore – automatic station memory
The Autostore memory function provides 
an additional memory level. The station 
memory for manually stored stations is not 
overwritten.
Calling up Autostore memory level and 
storing stations
Press 
AS soft key briefly.
The radio switches to the Autostore 
memory level. 
AS and 
SEARCH
 ap-
pear in the display and the radio 
finds the ten stations with the 
strongest signals. These stations 
are stored on the station buttons 
1 to R in order of signal 
strength.