MERCEDES-BENZ C320 2005 W203 Owner's Manual

179 Controls in detail
Climate control
Deactivating
Press buttonP (
page 175).
The indicator lamp on the button goes
out. Defrosting is turned off.
Air recirculation mode
Switch to air recirculation mode to prevent
unpleasant odors from entering the vehicle
from the outside. This setting cuts off the
intake of outside air and recirculates the
air in the passenger compartment.Activating

Press button, (
page 175).
The indicator lamp on the button
comes on.
Warning!
G
When the outside temperature is
below 41°F (5°C), only switch to air
recirculation mode for short periods to
prevent window fogging.
Window fogging may impair visibility and
endanger you and others.
iIf you keep button, pressed the
side windows and tilt/sliding sunroof*
will close.Warning!
G
Never operate the side windows and the
tilt/sliding sunroof* if there is the possibility
of anyone being harmed by the closing pro-
cedure.
In the event that the closing procedure
causes potential danger, the closing of the
side windows can be immediately halted by
pressing or pulling the respective window
switch. The closing of the tilt/sliding
sunroof* can be immediately halted by
moving the tilt/sliding sunroof* switch in
the overhead control panel in any direction.
The closing of the side windows and
tilt/sliding sunroof* can be reversed by
again pressing and holding the, button.

180 Controls in detailClimate control
Deactivating
Press button, (
page 175).
The indicator lamp on the button goes
out.The air recirculation mode is deactivated
automatically:


after five minutes if the outside
temperature is below
approximately 41°F (5°C)


after five minutes if the air conditioning
is turned off


after 30 minutes if the outside
temperature is above
approximately 41°F (5°C)
At outside temperatures above 79°F
(26°C) the system will not automatically
switch back to outside air. A quantity of
outside air is added after approximately
30 minutes.
iThe air recirculation mode is activated
automatically at high outside tempera-
tures.
The indicator lamp on the, button
is not lit when the air recirculation
mode is automatically switched on.
After approx. 30 minutes, outside air is
added to the air inside the vehicle.
If you have turned off the air condi-
tioning (
page 181) or the outside
temperature is below 41°F (5°C), the
air recirculation mode will not switch
on automatically.
iIf you keep button, pressed the
side windows and tilt/sliding sunroof*
will return to their previous position.

181 Controls in detail
Climate control
Air conditioning
The air conditioning is operational while
the engine is running and cools the interior
air to the temperature set by the operator.Deactivating
It is possible to deactivate the air condi-
tioning (cooling) function of the climate
control system. The air in the vehicle will
then no longer be cooled or dehumidified.

Press button± (
page 175).
The indicator lamp on the button
comes on.
The cooling function switches off after
a short delay.Activating
Moist air can fog up the windows. You can
dehumidify the air with the air condition-
ing.

Press button± (
page 175).
The indicator lamp on the button goes
out.
The air conditioning uses the
refrigerant R134a. This refrigerant is free
of CFCs which are harmful to the ozone
layer.
iCondensation may drip out from under-
neath the vehicle. This is normal and
not an indication of a malfunction.Warning!
G
If you turn off the cooling function, the
vehicle will not be cooled when weather
conditions are warm. The windows can fog
up more quickly. Window fogging may
impair visibility and endanger you and
others.
!If the air conditioning cannot be turned
on again, this indicates that the air
conditioning is losing refrigerant. The
compressor has turned itself off.
Have the air conditioning checked at
the nearest authorized Mercedes-Benz
Center.

182 Controls in detailClimate controlRear passenger compartment adjustable air vents
The air conditioning for the rear passenger
compartment is controlled via the climate
control panel (
page 175).The air vents for the rear passenger
compartment are located in the rear
center console.
1Left center air vent
2Thumbwheel for air volume control for
center air vents
3Right center air ventAdjusting air distribution

Push the slide for the left center
vent1 or right center vent3 to the
left, right, up or down.
The air flow is directed in the corre-
sponding direction.
Adjusting air volume

Turn thumbwheel2 up or down.
The air volume is increased or
decreased.
iThe temperature at the center air vents
for the rear passenger
compartment1 and3 i s t h e s a m e a s
at the dashboard center air vents.
iFor draft-free ventilation, push
slides1 and3 upward.

183 Controls in detail
Audio system
Audio system
Audio and telephone, operation
These instructions are intended to help
you become familiar with your
Mercedes-Benz audio system. They con-
tain useful tips and a detailed description
of the user functions.
Operating safety
Warning!
G
In order to avoid distraction which could
lead to an accident, the driver should enter
system settings with the vehicle at a
standstill and operate the system only when
road and traffic conditions permit. Always
pay full attention to traffic conditions first
before operating system controls while
driving.
Bear in mind that at a speed of just 30 mph
(approximately 50 km/h), your car is
covering a distance of 44 feet
(approximately 14 m) every second.
Warning!
G
Any alterations made to electronic
components can cause malfunctions.
The radio, amplifier, CD changer*, satellite
radio*, telephone* and voice control
system* are interconnected. When one of
the components is not operational 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
by an authorized Mercedes-Benz Center.

184 Controls in detailAudio systemOperating and display elements

185 Controls in detail
Audio system
Item
Page
1
CD changer mode selector
AUX mode selector
201
191
2
Single CD mode selector
203
3
Radio mode selector
4
Mute function (radio)
195
Pause (CD)
207
5
Volume distribution
189
6
Sound settings
187
7
Display
8
Alphanumeric keypad
Item
Page
9
Speed dialing memory
(telephone) in descending
order
a
Accepting a call
(telephone)
213
b
Telephone mode selector
208
c
Speed dialing memory
(telephone) in ascending
order
209
d
Terminating a call
(telephone)
213
e
CD slot
f
CD ejection
203
Item
Page
g
Soft keys
186
h
Volume
187
j
Switching on/off
186
k
Manual tuning / seek
tuning (radio)
193
Track search, reverse (CD)
206
l
Manual tuning / seek
tuning (radio)
193
Track search,
fast forward (CD)
206

186 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).

187 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.

188 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 187) 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.