Button functions MERCEDES-BENZ C300 2008 W204 User Guide

222 Controls in detail
Audio system
Telephone*
Safety precautionsWhen the telephone is connected via the
Bluetooth® interface to the audio system,
you can operate the telephone using the
following devices:

audio system (page 237)

Audio controller

Audio control unit

buttonss andt on the multi-
function steering wheel (
page 152)

mobile phone keypad
Please note that these functions are only
available with Mercedes-Benz approved
telephones.
Warning!G
Some jurisdictions prohibit the driver from
using a cellular telephone while driving.
Whether or not prohibited by law, for safety
reasons, the driver should not use the cellu-
lar telephone while the vehicle is in motion.
Stop the vehicle in a safe location before
placing or answering a call.
If you nonetheless choose to use the tele-
phone
1 while driving, please use the hands-
free device and be sure to pay attention to
the traffic situation at all times. Use the tele-
phone only when road, weather and traffic
conditions permit. Otherwise, you may not
be able to observe traffic conditions and
could endanger yourself and others.
1Observe all legal requirements.
Bear in mind that at a speed of just 30 mph
(approximately 50 km/h), your vehicle is
covering a distance of 44 feet (approxi-
mately 14 m) every second.
Warning!G
Never operate radio transmitters equipped
with a built-in or attached antenna (i.e. with-
out being connected to an external antenna)
from inside the vehicle while the engine is
running. Doing so could lead to a malfunc-
tion of the vehicle’s electronic system, pos-
sibly resulting in an accident and/or
personal injury.
iThe functions and services available to you
while using the telephone depend on your ser-
vice provider and the type of telephone you are
using. See also separate operating manual for in-
structions on how to use your telephone.

224 Controls in detail
Audio system
Operating options
When the telephone is connected via the
Bluetooth
® interface to the audio system,
you can operate the telephone using the
following devices:

buttonss andt and keypad on
audio control unit

audio controller in center console

multifunction steering wheel
Please note that these functions are only
available with Mercedes-Benz approved
telephones. Please contact an authorized
Mercedes-Benz Center for information on
features available for your telephone of
choice. Unless otherwise indicated, the descrip-
tions and illustrations in this section refer
to audio system.Caller ID
The audio system can display the tele-
phone number and the name of the caller,
e.g. for an incoming call and also in other
menus or displays.
For the telephone number to be displayed,
the caller must transmit their telephone
number.
This is also the case for name displays. For
this, the telephone number and the name
of the caller must also be saved in the tele-
phone book.
iThe components and operating principles of
the audio system can be found on (
page 177)
and (
page 187).
iIn order for the functions described in this
section to work correctly, the Bluetooth® tele-
phone must be linked to the audio system
(
page 192). Please make sure any other Blue-
tooth® device linked with the telephone is
switched off before you use the telephone func-
tions with the audio system.

231 Controls in detail
Audio system
“911” emergency call
The following describes how to dial a “911”
emergency call using the audio system
head unit when a Mercedes-Benz specified
mobile phone* is connected via the Blue-
tooth
® interface to the audio system. Un-
less otherwise specified, the descriptions
refer to the audio system head unit. Consult the separate telephone operating
instructions that came with your mobile
phone* for information on how to place a
“911” emergency call on the mobile
phone*.
The following conditions must be met for a
“911” emergency call via the audio
system:

Telephone must be switched on.

The corresponding mobile communica-
tions network must be available.
If you cannot make an emergency call, you
will have to initiate rescue measures your-
self. GSM network phones
Placing a “911” emergency call using
audio control unit with the phone un-
locked
Press hbutton to switch to tele-
phone mode.
Enter 911 using the number keypad on
the audio control unit.
Press sbutton.
or
Press n for dialing to begin.
DIALING appears in the audio display
while the telephone establishes the
connection.
Wait until the emergency call center
answers, then describe the emergency.
iThe “911” emergency call system is a public
service. Using it without due cause is a criminal
offense.
iThis function places a call to the local 911
provider. It does not initiate a Tele Aid call.
iEmergency calls may not be possible with all
telephone networks or if certain network serv-
ices and/or telephone functions are active.
Check with your local service providers.

239 Controls in detail
Audio system
Rejecting or accepting calls
You will be notified of an incoming call by
the ringing tone and a message on the dis-
play.
If the caller's name and number are among
the entries in the audio system's phone
book and the caller has not withheld this
information, it will appear on the display. If
the caller withholds this information, you
will see:
To accept: Press buttons on audio
control unit.
or
Press n on the audio controller.
To reject: Press buttont on audio
control unit.
or
Slideomor rotateymz the audio con-
troller to select
Reject, and press n
on the audio controller to confirm.
The call is rejected.If you have accepted the call using the au-
dio control unit, audio controller, or the
multifunction steering wheel, the call will
be conducted via the hands-free system.
The volume of the call can be adjusted
(
page 189).
Further operating functions can be found
in the “Functions during a single-call” sec-
tion (
page 240).
You can also accept a call if the audio dis-
play is showing a screen other than the
telephone mode screen. After accepting
the call, the display switches to the phone
display. Once the call is over, the display
for the previous mode will appear again.
iDepending on the mobile phone you are us-
ing, the audio system's ringing tone may differ
from the one you have set on your phone. You
may hear

the ringing tone set on the mobile phone

the audio system's preset ringing tone

the audio system's preset ringing tone and
the ringing tone set on the mobile phone.

240 Controls in detail
Audio system
Functions during a single call
Switching hands-free microphone on or
off
The menu bar changes when you make or
receive a call. Instead of the
Call Lists
menu item,
Mic Off or Mic On will appear.
To switch off: Select Mic Off.
The following message will flash up on
the display:
The microphone is off.
When the microphone is switched off
the symbol > appears in the main
area.
To switch on: Select Mic On.
The following message will flash up on
the display:
The microphone is on.
The microphone is switched on and the
symbol > disappears in the main area. Sending DTMF tones
Answering machines or other devices can
be controlled via DTMF tones, e.g. for re-
mote query functions.
To transmit individual characters:
During a call select the required char-
acters.
or
Press the corresponding button on the
audio control unit.
Every selected character is transmitted
immediately.
Transmitting a phone number of a
phone book entry as a sequence of
characters: Select
Name.
Select the desired phone book entry.
The entry is transmitted immediately as
a sequence of characters.
To switch back to call display: Select
Back.
iThis function is not possible with all mobile
phones.

256 Controls in detail
Dual-zone automatic climate control
Maximum cooling MAX COOL
(USA only)
You can use this setting to provide the fast-
est possible cooling of the vehicle interior
(when windows and tilt/sliding sunroof or
tilt/sliding panel* are closed).
Activating: Press button3
(
page 250).
The indicator lamp in the button comes
on.
The air conditioning switches
automatically to the following functions:

maximum cooling

maximum blowing power

the air recirculation mode is switched
on
Deactivating: Press button3
(
page 250) again.
The indicator lamp in the button goes
out. The previous settings are once
again in effect.
Rear window defroster
Activating: Switch on the ignition.
Press button¯ (page 250).
The indicator lamp in the button comes
on.
iTo switch the maximum cooling function off,
you can also press button ´, U ory
(
page 250).
Warning!G
Any accumulation of snow and ice should be
removed from the rear window before driv-
ing. Visibility could otherwise be impaired,
endangering you and others.
!The rear window defroster uses a large
amount of power. To keep battery drain to a min-
imum, switch off the defroster as soon as the
rear window is clear.

264 Controls in detail
3-zone automatic climate control* (Canada only)
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 buttony
(
page 259).
The indicator lamp in the button comes
on.
The air conditioning switches
automatically to the following functions:

cooling on to dehumidify

most efficient blower speed and
heating power, depending on out-
side temperature

air flows onto the windshield and
the front side windows

the air recirculation mode is
switched off
Deactivating: Press buttony
(
page 259) again.
The indicator lamp in the button goes
out. Defrosting is turned off.
The previous settings are once again in
effect.Windshield fogged on the outsideSwitch the windshield wipers on
(
page 118).
If the automatic mode of the climate con-
trol is switched off:
Press righta and/or lefte air distri-
bution buttonZ (
page 259) re-
peatedly until one of the following
symbols appears in
displayd:aorY
(
page 259).
iKeep this setting selected only until the
windshield is clear again.
iYou can adjust the air distribution when the
front defroster is switched on.
iTo switch defrosting off, you can also press
button´, U,·,Q or temperature
controls1 and8 (
page 259).
iThe cooling remains switched on.
iKeep this setting selected only until the
windshield is clear again.

296 Controls in detail
Useful features
System self-check
Initially, after switching on the ignition,
malfunctions are detected and indicated.
If a malfunction is detected, the indicator
lamps in the SOS button, the Roadside As-
sistance button*b and the Information
button*} stay on longer than
10 seconds or do not come on. The mes-
sage
Tele Aid not activated or Tele Aid
inoperative
appears in the multifunction
display.Emergency calls
An emergency call is initiated
automatically following an accident in
which the emergency tensioning devices
(ETDs) or air bags deploy.
An emergency call can also be initiated
manually by opening the cover next to the
interior rear view mirror labeled SOS, then
briefly pressing the button located under
the cover. For instructions on initiating an
emergency call manually (
page 298).
Once the emergency call is in progress, the
indicator lamp in the SOS button will begin
to flash. The message:

Connecting call appears in the multi-
function display
and the audio system is muted. When the
connection is established, the message:

Call connected appears in the multi-
function display
Warning!G
If the indicator lamps in the SOS button, in
the Roadside Assistance button*b
and/or in the Information button*}do
not come on during the system self-check,
or if any of these indicators remain illuminat-
ed continuously in red and/or the message
Tele Aid not activated or Tele Aid
inoperative
is displayed in the multifunc-
tion display after the system self-check, a
malfunction in the system has been detect-
ed.
If a malfunction is indicated as outlined
above, the system may not operate as ex-
pected. Have the system checked at the
nearest Mercedes-Benz Center as soon as
possible.

344 Operation
Tires and wheels
If you wish to cancel activation:
Press button $or% to select
No.
Press button# to confirm.
The previous settings will not be
changed
or
Wait until the message
Run Flat Indicator?
Restart
disappears.
Checking tire pressure electronically
with the Tire Pressure Monitoring
System (TPMS), (USA only)The TPMS only functions on wheels that
are equipped with the proper electronic
sensors. It monitors the tire inflation pres-
sure, as selected by the driver, in all four
tires. A warning is issued to alert you to a
decrease in pressure in one or more of the
tires.
iThe Tire Pressure Monitoring System
(TPMS) is equipped with a combination low tire
pressure/TPMS malfunction telltale in the
instrument cluster (
page 26). Depending on
how the telltale illuminates, it indicates a low tire
pressure condition or a malfunction in the TPMS
system itself:

If the telltale illuminates continuously, one
or more of your tires is significantly underin-
flated. There is no malfunction in the TPMS.

If the telltale flashes for 60 seconds and
then stays illuminated, the TPMS system
itself is not operating properly.
iThis device complies with Part 15 of the
FCC Rules. Operation is subject to the following
two conditions:
(1) This device may not cause harmful interfer-
ence, and
(2) this device must accept any interference
received, including interference that may
cause undesired operation.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
Warning!G
The TPMS does not indicate a warning for
wrongly selected inflation pressures. Always
adjust tire inflation pressure according to
the Tire and Loading Information placard on
the driver’s door B-pillar or, if available, the
supplemental tire pressure information on
the inside of the fuel filler flap.
The TPMS is not able to issue a warning due
to a sudden dramatic loss of pressure (e.g.
tire blowout caused by a foreign object). In
this case bring the vehicle to a halt by care-
fully applying the brakes and avoiding
abrupt steering maneuvers.