Page 190 of 474

189 Controls in detail
Automatic climate control*
Front defroster
You can use this setting to defrost the 
windshield, for example if it is iced up.
You can also defog the windshield and the 
side windows.
Activating
Press buttonP (page 184).
The indicator lamp on the button 
comes on.
The air conditioning switches 
automatically to the following functions:
cooling on to dehumidify
maximum blowing and heating 
power
air flows onto the windshield and 
the front side windowsDeactivating
Press buttonP (page 184) again.
The indicator lamp on the button goes 
out.
The previous settings are once again in 
effect.
Windows fogged on the outside
Switch the windshield wipers on 
(
page 56).
Press buttonU (page 184).
The indicator lamp on the button 
comes on. Air distribution and air 
volume are adjusted automatically.
If the automatic air distribution and air 
volume are switched off:
Turn air distribution control8 to 
positionaorY (
page 184).
Maximum cooling MAX COOL
When operating the automatic climate 
control system in automatic modeU 
and there is a high need for cooling, 
MAX COOL is activated. This provides the 
fastest possible cooling of the vehicle’s in-
terior (when retractable hardtop is closed).
MAX COOL will appear in displaye 
(
page 184).
iKeep this setting selected only until the 
windshield or the side windows are clear again.
iWhen you have activated the front defroster 
using buttonP, no other settings are 
possible.
iThe cooling remains switched on.
iKeep this setting selected only until the 
windshield is clear again. 
     
        
        Page 193 of 474

192 Controls in detail
Automatic climate control*
Deactivating
It is possible to deactivate the air condi-
tioning (cooling) function of the automatic 
climate control system. The air in the 
vehicle will then no longer be cooled or 
dehumidified.
Press buttonœ (page 184).
The indicator lamp on the button goes 
out.
Activating
Moist air can fog up the windows. You 
can dehumidify the air with the air 
conditioning.
Press buttonœ (page 184).
The indicator lamp on the button 
comes on.
Residual heat and ventilation
With the engine switched off, it is possible 
to continue to heat or ventilate the interior 
for up to 30 minutes. This feature makes 
use of the residual heat produced by the 
engine.Activating
Switch off the ignition (page 37).
Press buttonT (page 184).
The indicator lamp on the button 
comes on. The display in the automatic 
climate control panel remains switched 
off.
Deactivating
Press buttonT (page 184) again.
The indicator lamp on the button goes 
out.
iHow long the system will provide heating 
depends on
the coolant temperature
the temperature set by the operator
The blower will run at speed setting1 regardless 
of the air volume control setting.
iThe residual heat is automatically turned off:
when the ignition is switched on (page 37)
after about 30 minutes
if the battery voltage drops 
     
        
        Page 195 of 474
194 Controls in detail
Audio system
Operating and display elements 
     
        
        Page 196 of 474
195 Controls in detail
Audio system
ItemPage
1CD changer mode selector208
2Single CD mode selector 212
3Radio mode selector
4Mute function (radio)202
Pause (CD)218
5Volume distribution198
6Sound settings197
7Display
8Alphanumeric keypad
ItemPage
9Speed dialing memory (tele-
phone*) in descending order
aAccepting a call
(telephone*)224
bTelephone* mode selector219
cSpeed dialing memory (tele-
phone*) in ascending order221
dTerminating a call
(telephone*)225
eCD slot
fCD ejection212
ItemPage
gSoft keys196
hVolume196
jSwitching on/off196
kManual tuning / seek 
tuning (radio)201
Track search, reverse (CD)217
lManual tuning / seek 
tuning (radio)201
Track search,
fast forward (CD)217 
     
        
        Page 197 of 474

196 Controls in detail
Audio system
Button 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 (
page 37). 
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
PressDbutton.Switching off
Remove the SmartKey from the starter 
switch.
or
PressDbutton.
Adjusting the volume
Turn rotary control ofEbutton.
The volume will increase or decrease 
depending on the direction turned.
!Do not press directly in the display face. 
Otherwise, the display will be damaged.
iIf the radio is switched on without the 
SmartKey in the starter switch, it will automati-
cally switch off again after approximately 
30 minutes.
If your vehicle is equipped with a mobile 
telephone*, the display may prompt you to enter 
your PIN (GSM network) or code (TDMA or 
CDMA network).
iShould excessively high temperatures occur 
while the audio system is being operated, the 
display will dim. If temperatures 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 198 of 474
197 Controls in detail
Audio system
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 8 seconds after 
the last soft key is pressed.Adjusting 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 8 seconds after 
the last soft key is pressed. 
     
        
        Page 199 of 474

198 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.
The radio switches back to the 
standard radio menu 4 seconds after 
the last soft key is pressed.Adjusting balance
Press P button.
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 8 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 the 
balance is set to the center level.
The radio switches back to the 
standard radio menu 4 seconds after 
the last soft key is pressed. 
     
        
        Page 200 of 474
199 Controls in detail
Audio system
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.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 202).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