2008 MERCEDES-BENZ C300 wheel

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.

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.

241 Controls in detail
Driving systems
Driving systems
The driving systems of your vehicle are de-
scribed on the following pages:

Cruise control, with which the vehicle
can maintain a preset speed.

Hill start assist system which helps you
to start off smoothly on a hill.
For information on the ABS, Adaptive
Brake, BAS, EBP, ESP
®, and 4MATIC, see
“Driving safety systems” (
page 59).
Cruise control
The cruise control automatically maintains
the speed you set for your vehicle.
The use of the cruise control is recom-
mended for driving at a constant speed for
extended periods of time.
You can set or resume the cruise control at
any speed over 20 mph (30 km/h).
The cruise control function is operated by
means of the cruise control lever.
Warning!G
The cruise control is a convenience system
designed to assist the driver during vehicle
operation. The driver is and must always
remain responsible for the vehicle’s speed
and for safe brake operation.
Only use the cruise control if the road,
traffic, and weather conditions make it
advisable to travel at a steady speed.

The use of the cruise control can be
dangerous on winding roads or in heavy
traffic because conditions do not allow
safe driving at a steady speed.

The use of the cruise control can be
dangerous on slippery roads. Rapid
changes in tire traction can result in
wheel spin and loss of control.

Deactivate the cruise control when
driving in fog.
The “Resume” function should only be
operated if the driver is fully aware of the
previously set speed and wishes to resume
this particular preset speed.
Warning!G
The cruise control brakes automatically so
that the set speed is not exceeded. The
brake pedal depresses when the cruise con-
trol engages the brakes.
Keep driver’s foot area clear at all times, in-
cluding the area under the brake pedal. Ob-
jects stored in this area may impair pedal
movement which could interfere with the
braking ability of the cruise control system.
Do not place your foot under the brake pedal
– your foot could become caught.
Keep in mind that the cruise control is a con-
venience system designed to assist the driv-
er during vehicle operation. The driver is and
must always remain responsible for the ve-
hicle’s speed and for safe brake operation.

247 Controls in detail
Air vents
Air vents
Item
1Left side air vent, adjustable
2Thumbwheel for air volume control
for left side air vent
3Left side defroster vent, fixed
4Thumbwheel for air volume control
for left center air vent
Item
5Left center air vent, adjustable
6Right center air vent, adjustable
7Thumbwheel for air volume control
for right center air vent
8Right side defroster vent, fixed
Item
9Thumbwheel for air volume control
for right side air vent
aRight side air vent, adjustable
bClimate control panel

248 Controls in detail
Air vents
Please comply with the following instruc-
tions in order for the automatic climate
control to function optimally:

Keep the air intake grille in front of the
windshield free of snow, leaves, sticks,
and any other debris.

Always keep all air vents and grilles in
the passenger compartment free from
obstruction.
Opening and closing air vents
Center air vents
Opening/closing:
Turn thumbwheels4 and7 upward
or downward.
Adjusting air distribution: Push the
slide for the left center air vent5 or
right center air vent6 to the left,
right, up, or down.
The air flow is directed in the corre-
sponding direction.
Warning!G
When operating the automatic climate con-
trol, the air that enters the passenger com-
partment through the air vents can be very
hot or very cold (depending on the set tem-
perature). This may cause burns or frostbite
to unprotected skin in the immediate area of
the air vents.
Always keep sufficient distance between un-
protected parts of the body and the air
vents. If necessary, use the air distribution
adjustment (
page 248) to direct the air to
air vents in the vehicle interior that are not
in the immediate area of unprotected skin.
iFor draft-free ventilation, move the sliders
for the center air vents and side air vents to the
middle position.

249 Controls in detail
Air vents
Side air vents
Opening/closing:
Turn thumbwheels2 and/or9 up-
ward or downward.
Adjusting air distribution: Push the
slide for the left side air vent1 or right
side air venta to the left, right, up, or
down.
The air flow is directed in the corre-
sponding direction.Rear center console air vents
1Thumbwheel for air volume control for
rear passenger compartment air vents.
2Right center air vent, adjustable
3Left center air vent, adjustable
Opening/closing: Turn
thumbwheel1 upward or downward.
Adjusting air distribution: Push the
slide for the left center air vent3 or
right center vent2 to the left, right,
up, or down.
The air flow is directed in the corre-
sponding direction.

295 Controls in detail
Useful features
lTele Aid*
The Tele Aid system
(Tele
matic Alarm Identification on De-
mand)
The Tele Aid system consists of three
types of response:

automatic and manual emergency

Roadside Assistance, and

informationThe Tele Aid system is operational provid-
ing that the vehicle’s battery is charged,
properly connected, not damaged and
telephone phone and GPS coverage are
available.
The speaker volume of a Tele Aid call can
be adjusted when using the volume control
on the multifunction steering wheel. To
raise, press buttonæ and to lower,
press buttonç or use the audio system
rotary control button (
page 189).
To activate, press the SOS button, the
Roadside Assistance button*b or
the Information button*}, depend-
ing on the type of response required.
Shortly after the completion of your
Tele Aid acquaintance call, you will receive
a user ID and password. By visiting
www.mbusa.com and selecting “Tele Aid”
(USA only), you will have access to account
information, remote door unlock and
more.
!The initial activation of the Tele Aid system
may only be performed by completing the sub-
scriber agreement and placing an acquaintance
call using the Information button*}. Failure
to complete either of these steps will result in a
system that is not activated.
If you have any questions regarding activation,
please call the Response Center at
1-800-756-9018 (in the USA) or
1-888-923-8367 (in Canada).
iThe Tele Aid system utilizes the telephone
network for communication and the GPS (Global
Positioning System) satellites for vehicle loca-
tion. If either of these signals are unavailable, the
Tele Aid system may not function and if this oc-
curs, assistance must be summoned by other
means.
iThe SOS button, the Roadside Assistance
button*b, and the Information
button*} are located in the overhead con-
trol panel (
page 31).

299 Controls in detail
Useful features
Roadside Assistance button*b
The Roadside Assistance buttonb is
located in the overhead control panel.
1Roadside Assistance buttonb
Press and hold Roadside Assistance
button b (for longer than
2 seconds).
A call to a Mercedes-Benz Roadside As-
sistance dispatcher will be initiated.
The button will flash while the call is in
progress. The message:

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

Call connected appears in the multi-
function display
The Tele Aid system will transmit data gen-
erating the vehicle identification number,
model, color and location (subject to avail-
ability of cellular and GPS signals).
A voice connection between the Roadside
Assistance dispatcher and the occupants
of the vehicle will be established.
Describe the nature of the need for as-
sistance.
The Mercedes-Benz Roadside Assistance
dispatcher will either dispatch a qualified
Mercedes-Benz technician or arrange to
tow your vehicle to the nearest authorized
Mercedes-Benz Center. For services such
as labor and/or towing, charges may ap-
ply. Refer to the Roadside Assistance Man-
ual for more information.
These programs are only available in the
USA:

Sign and Drive services: Services such
as jump start, a few gallons of fuel or
the replacement of a flat tire with the
vehicle spare tire are obtainable.
iThe indicator lamp in the Roadside Assis-
tance buttonb remains illuminated in red for
approximately 10 seconds during the system
self-check after switching on the ignition (togeth-
er with the SOS button and the Information
button*}).
See system self-check (
page 296) if the indi-
cator lamp does not come on in red or stays on
longer than approximately 10 seconds.
If the indicator lamp in the Roadside Assistance
buttonb is flashing continuously and no
voice connection to the Response Center was
established, the Tele Aid system could not ini-
tiate a Roadside Assistance call (e.g. the relevant
telephone network is not available). The mes-
sage:

Call failed appears in the multifunction
display for approximately 10 seconds
Roadside Assistance calls can be terminated us-
ing the t button on the multifunction steer-
ing wheel or the respective button for ending a
telephone call on the audio system or the
COMAND* head unit.