2008 MERCEDES-BENZ C300 4MATIC Owner's Manual

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.

225 Controls in detail
Audio system
Functional restrictions
You will not be able to use the telephone,
or you may have to wait a while, in the fol-
lowing situations:

If the telephone is switched off.

If the telephone is not connected via
the Bluetooth® interface to the audio
system.

The telephone must not be locked.

If the telephone has not yet logged into
the network.
The telephone automatically tries to
log into a network. If no network is
available, you will also not be able to
make a “911” emergency call.
If you attempt to make an outgoing call,
the
No Service message will appear for
a short while.

If you switch off the audio system in the
middle of a call, e. g. by switching off
the ignition, that call will be cut off. You
can prevent this from happening as fol-
lows:

Switch the phone to “private mode”
before switching the audio system
off (see telephone operating in-
structions).Activating the telephone
Prerequisites for the telephone
For making calls using the audio system
via the Bluetooth
® interface, you will need
a Bluetooth® enabled telephone.
Before attempting to make or receive calls
via the Bluetooth
® interface, check your
phone's hands-free profile. It must support
version 1.0 or higher (see telephone oper-
ating instructions).
iNot all telephones on the market are suit-
able. Further information on suitable telephones
and on connecting Bluetooth
® enabled tele-
phones to the audio system are available from an
authorized Mercedes-Benz Center.

226 Controls in detail
Audio system
Activating Bluetooth®
Switch on the telephone
(see telephone operating instructions).
Enter the PIN (not necessary at each
telephone or network).
Activate Bluetooth® connection on the
telephone (see telephone operating in-
structions)
Press buttonh on the audio control
unit to call up the telephone mode.
Activate Bluetooth® connection on the
audio system (
page 193).
ê
System
Activate Blue-
tooth
.
You have activated or deactivated
Bluetooth
®. A checkmark appears
when Bluetooth® is activated.
Registering a telephone (authorizing)
When you use your telephone in conjunc-
tion with the audio system for the first
time, you must register (authorize) it.
It is possible to register several tele-
phones. The connection is always estab-
lished to the last activated telephone in
signal range. When you authorize a new
telephone, it is activated automatically.
You can switch between the authorized
telephones.Searching for a telephone
h
Tel
Phone List
Update.
The audio system searches for suitable
Bluetooth
® telephones within range
and enters them in the telephone list.
Authorized Bluetooth
® telephones will
be identified by a telephone-symbol in
front of the list entry once the tele-
phone list has been updated. (The sym-
bol will be grayed out if the authorized
phone is not located in the Bluetooth
®
range.)
iOn certain telephones, not only do you have
to activate the Bluetooth® function but your own
device must additionally be made “visible” for
other devices.
Each Bluetooth
® device has a Bluetooth® device
name. It is recommended to give your telephone
a personal name, by which you can clearly recog-
nize your telephone.
iIf the Bluetooth® function on the audio sys-
tem is disabled, the message
Bluetooth not
activated in system settings
appears.
iThe duration of the search procedure de-
pends on the number and type of Bluetooth®
telephones. The search may take a few minutes.
iIf the telephone list is already full (15 en-
tries), you must de-authorize one of the autho-
rized devices. Then you will start the search
again. Otherwise a new device you are looking
for will not appear in the list.
If the audio system does not find your phone, ex-
ternal authorization may be necessary
(
page 228).

227 Controls in detail
Audio system
Authorizing a Bluetooth® device
Select the desired unauthorized device
from the telephone list by pushing the
audio controller.
or
Select Options
Authorize.
The input menu for the passcode
appears.On the audio system, you can enter the
passcode via the digits in the on-screen
menu bar or via the telephone keypad in
the audio control unit.With the audio controller:
Entering passcode: Select the digits
in the menu bar one by one, by
slidingompor rotating ymz the audio
controller.
Press n to confirm each digit.
Confirming passcode: Selectdin
the menu bar and press n to confirm.
Deleting digits: Select õ in the
menu bar and briefly press n to delete
one digit, or press and hold n to delete
all entered digits.
Canceling entry: Press buttoní in
the center console (
page 184).
iThe passcode is any one- to sixteen-digit
number, which you can set yourself. For the
quality of coding of the connection it is recom-
mend to use a passcode of at least four digits.
You must enter the same number in the audio
system and also in the device to be authorized.
Please also refer to the instructions in the tele-
phone operating guide.

228 Controls in detail
Audio system
With keypad on audio control unit:
Entering passcode: Press the desired
numbers on the keypad.
Confirming passcode: Press
buttons or buttonô in the au-
dio control unit to confirm.
Deleting digits: Briefly press
buttonî in the audio control unit to
delete one number, or press and hold
buttonî to delete all entered num-
bers.
Canceling entry: Press buttoní in
the center console (
page 184).Entering passcode into the telephone
If a Bluetooth
® connection is established
successfully, you will be prompted to enter
a code into the telephone (see the operat-
ing instructions for the telephone).
Enter the same passcode on the tele-
phone as you did on the audio system.
The device is authorized. You can now
make calls via the audio system hands-free
device using the authorized telephone.External authorization
If the audio system cannot find your tele-
phone, this may be due to special security
settings on your telephone. In this case,
you can check whether, conversely, your
telephone can find the audio system. The
audio systems Bluetooth® device name is
“MB Bluetooth”.
h
Tel
Phone List
Update


Options
External Authoriza-
tion
.
Start Bluetooth® search procedure on
the telephone (see the operating in-
structions for the telephone).
Select the audio system (“MB Blue-
tooth”).
When prompted to do so, enter the
passcode on the telephone and then on
the audio system.
iYou may need to enter a confirmation once
you have entered the passcode on your phone.
Check your phone display.
If the message
Authorization Procedure
Unsuccessful
appears on the audio system
display, you may have exceeded the preset peri-
od for authorization. Repeat the process.

229 Controls in detail
Audio system
Displaying details on a telephone
h
Tel
Phone List.
Select the telephone from the list.
Select Options
Details.
The details screen for the device is
shown in the audio display.
To close details screen:
Slideompthe audio controller or
press buttoní in the center
console.
De-authorizing a Bluetooth
® device
h
Tel
Phone List.
Select authorized device.
Select Options
De-Authorize.
A prompt appears asking whether you
really want to de-authorize this device.
Select Yes or No.
If you select
Yes, the device will be
de-authorized.Activating another telephone
If you have several authorized telephones,
you can switch between the individual tele-
phones.
When you authorize a new telephone, it is
automatically activated. Only one tele-
phone can be active at a time.
h
Tel
Phone List.
Select an authorized telephone from
the list.
Press n to confirm.
The selected phone will be searched
for and connected if it is located in the
Bluetooth
® range and Bluetooth® is ac-
tivated on the corresponding device.
The selected telephone is activated.
A dotR in front of the entry, indicates
the current active telephone in the
phone list.
Receiving business cards
You can import business cards (vCards)
into the address book from external Blue-
tooth
® devices (page 233).
iIf you de-authorize a device which has been
authorized in the past and which is not detected
in the search, this device will no longer be dis-
played in the device list.
Devices which have been authorized in the past
but which are not detected in the search are ei-
ther not switched on or not in the vehicle.
iYou cannot switch to another authorized
phone during a call.

230 Controls in detail
Audio system
TEL-Basic display
Press buttonh on the audio control
unit to call up the telephone mode.
When the connected phone is ready for op-
eration, the display will look like this:
The following information is displayed in
the status bar:

Actual time:
04:38

Bluetooth® device name of the con-
nected phone, in this case:
blue_mobil

Mobile phone network signal
strengthI. This information will
only be shown with suitable tele-
phones.The bars indicate the current signal
strength of the mobile phone network
for reception. Optimum reception is in-
dicated by all bars full. All bars empty
indicates very poor or no reception.

Receiver symbols ort.
The receiver symbol indicates whether
a call is being connected or is in
progress:
t - not active

READY indicates that a call is possible.

NO SERVICE indicates that the mobile
network is not available.Setting transmit and receive volume
h
Tel
Phone List.
Select an mobile phone from the list.
Select Options
Reception Volume
or
Transmission Volume.
To set the volume: Slideqmror
rotateymz the audio controller.
The volume bar moves up or down.
To confirm selection: Press n or
slideomp the audio controller.
iThese settings should normally not be
changed as the factory settings are matched to
most mobile phones. Find out about the opti-
mum settings for your mobile phone at an
authorized Mercedes-Benz Center.
iChanges may result in significant impair-
ments to the transmission quality. These set-
tings may not be changed during an active phone
call.

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.