Page 180 of 464
180 Controls in detailClimate control
Residual engine heat utilization
With the engine switched off, it is possible
to continue to heat or ventilate the interior
for up to 30 minutes, depending on the
temperature setting of the climate control.
Air volume and distribution are controlled
automatically. This feature makes use of
the residual heat produced by the engine.Activating
Turn the SmartKey in the starter switch
to position1or0, or remove it from
the starter switch.
Press air condition on/off switch°
(page 175).
The indicator lamp on the air condition
on/off switch° comes on.
Set the left and right temperature to
your personal requirements.
iWhen the vehicle’s interior has cooled
down enough, reduce the air volume
and increase the air temperature to
comfortable settings if desired.
Page 189 of 464

189 Controls in detail
Automatic climate control*
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, depending on the
temperature setting of the climate control.
This feature makes use of the residual heat
produced by the engine.
Activating
Turn the SmartKey in the starter switch
to position1or0, or remove it from
the starter switch.
Press residual heat/ventilation
switchT (
page 185).
The indicator lamp on the residual
heat/ventilation switchT comes
on.Deactivating
Press residual heat/ventilation
switchT again (
page 185).
The indicator lamp on the residual
heat/ventilation switchT goes out.
The residual heat switches off
automatically
when you switch on ignition
(page 35)
after about 30 minutes
if the battery voltage drops
Defrosting
Windows fogged up on the inside
Press defrosting switchP
(page 185).
The indicator lamp on defrosting
switchP comes on.
The temperature rises and the ventila-
tion operates with maximum blower
speed.
Press defrosting switchP again.
The previous automatic climate control
settings will be activated again.
iHow long the system will provide heat-
ing depends on the coolant tempera-
ture and the temperature set by the
operator. The blower will run at speed
setting1 regardless of the air distribu-
tion control setting.
Page 193 of 464
193 Controls in detail
Audio system
Item
Page
1
CD changer mode selector
207
2
Single CD mode selector
208
3
Radio mode selector
4
Mute function (radio)
200
Pause (CD)
215
5
Volume distribution
196
6
Sound settings
195
7
Display
8
Alphanumeric keypad
Item
Page
9
Speed dialing memory
(telephone) in descending
order
a
Accepting a call
(telephone)
221
b
Telephone mode selector
216
c
Speed dialing memory
(telephone) in ascending
order
218
d
Terminating a call
(telephone)
221
e
CD slot
f
CD ejection
209
Item
Page
g
Soft keys
194
h
Volume
195
j
Switching on/off
194
k
Manual tuning / seek
tuning (radio)
199
Track search, reverse (CD)
214
l
Manual tuning / seek
tuning (radio)
199
Track search,
fast forward (CD)
214
Page 194 of 464
194 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 (
page 35).
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
D
button.
!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
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 195 of 464

195 Controls in detail
Audio system
Switching off
Remove the SmartKey from the starter
switch.
or
Press
D
button.
Adjusting the volume
Turn rotary control of
E
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 196 of 464

196 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.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 four 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 eight seconds
after the last button is pressed.
Page 197 of 464
197 Controls in detail
Audio system
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 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.
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 201).
iFM waveband: 87.7......107.9 MHz
AM waveband: 530......1 710 KHz
Page 198 of 464
198 Controls in detailAudio systemCalling 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.Calling 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 199)
Manual tuning (
page 199)
Automatic seek tuning (
page 199)
Scan search (
page 199)
Station memory (
page 200)
Automatic station memory (Autostore)
(page 200)
The station search proceeds in the
following frequency increments:
200 kHz in FM range
10 kHz in AM range