
Symbols
Trademarks:
R BabySmart TM
 is a trademark of Siemens
Automotive Corp.
R Bluetooth ®
 is a registered trademark of
Bluetooth SIG Inc.
R ESP ®
 is a registered trademark of Daimler.
R HomeLink ®
 is a registered trademark of
Prince, a Johnson Controls Company.
R Logic  7 ®
 is a registered trademark of
Harman International Industries,
Incorporated.
R Microsoft ®
 is a registered trademark of
Microsoft Corporation in the U.S.A. and
other countries.
R SIRIUS and related marks are trademarks
of SIRIUS XM Radio Inc.
R Windows media ®
 is a registered trademark
of Microsoft Corporation in the U.S.A. and
other countries.
The following symbols are found in this
Operator’s Manual:GWarning!
Warning notices draw your attention to
hazards that may endanger your health or life,
or the health or life of others.
!  Highlights hazards that may result in
damage to your vehicle.
i Helpful hints or further information you
may find useful.
XThis symbol points to instructions
for you to follow.XA number of these symbols
appearing in succession indicates
a multiple-step procedure.Y  pageThis symbol tells you where to look
for further information on a topic.YYThis continuation symbol marks a
warning or procedure which is
continued on the next page.DisplayText in displays, such as the control
system, are printed in the type
shown here.X204_AKB; 3; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T19:16:58+02:00 - Seite 2 

1, 2, 3 ...
115V AC Socket  ................................. 198
4-ETS see ETS/4-ETS                                          
4MATIC
see All-wheel drive (4MATIC)                    
911 Emergency calls  ........................ 161
A
ABS (Antilock Brake System)  
Indicator lamp ................................ 289
Messages in the multifunction
display  ................................... 271, 272
Accessory weight  .............................. 239
Accidents  ........................................... 101
Air bags  ........................................... 37
Emergency calls (Tele Aid)  .............201
Emergency calls (Telephone)  .........161
NECK-PRO active front head
restraints   ........................................ 51
Active Bi-Xenon headlamps
see Headlamps                                         
Additives  
Engine oil  ....................................... 336
Gasoline ......................................... 337
Address change  ................................... 21
Advanced Tire Pressure
Monitoring System (Advanced
TPMS)  ................................................. 224
Messages in the multifunction
display  ........................................... 268
Air bags  ................................................ 37
Emergency call upon deployment  ..201
Front, driver and passenger  .............40
Front passenger front air bag off
indicator lamp (Canada
only)  ........................................ 45, 297
Front passenger front air bag off
indicator lamp (USA only)  ........42, 298
Messages in the multifunction
display  ........................................... 264
OCS (Occupant Classification
System)  ........................................... 42
Safety guidelines  ............................. 39
Side impact  ...................................... 40
Window curtain  ................................ 41
Air conditioning refrigerant and
lubricant  ............................................. 336
Air distribution  .................................. 181
Air pressure see Tire inflation pressure                        
Air pressure (tires)  ............................ 239
Air pump (electric)  ............................ 315
Air recirculation mode  ...................... 183
Air volume  .......................................... 182
Alarm system see Anti-theft systems                              
All-wheel drive (4MATIC)  .................. 171
Alternator  
Messages in the multifunction
display  ........................................... 281
Alternator (Technical data)
see Vehicle specification                          
Anticorrosion/antifreeze  .................. 338
Anti-theft systems  ............................... 63
Anti-theft alarm system  ...................63
Immobilizer  ...................................... 63
Aquaplaning
see Hydroplaning                                      
Armrest, front  
Storage compartments  ..................193
Armrest, rear  
Storage compartment  ....................193
Ashtrays  ............................................. 196
Aspect ratio (tires)  ............................ 239
Audio menu  ........................................ 115
Audio system  ..................................... 125
Adjusting volume  ........................... 133
Audio and telephone operation  ......125
Audio AUX mode ............................ 154
Bluetooth ®
 settings  ....................... 135
CD mode ........................................ 146
Components  .................................. 126
MP3 mode  ..................................... 146
Operating safety  ............................ 126
Radio operation  ............................. 136
Satellite radio  ................................ 140
Switching on and off  ......................132
System settings  ............................. 135
Telephone  ...................................... 155
Auto-dimming rear view mirrors  ........ 84
Automatic central locking  .......... 70, 124
Automatic headlamp mode  ................ 884IndexX204_AKB; 3; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T19:16:58+02:00 - Seite 4 

Proximity keysee Key, SmartKey                                    
PSI (air pressure unit)  ....................... 240
R
Radio  .................................................. 136
Satellite radio  ................................ 140
Selecting stations  ..........................115
Radio transmitters  ............................ 249
Rain sensor see Intermittent wiping                             
Rear axle oil  ....................................... 334
Rear center console ashtray see Ashtrays                                             
Rear center seat belt  
Unblocking ....................................... 50
Rear doors  
Child safety locks  ............................ 58
Rear door window  
Override switch  ................................ 58
Rear fog lamp
see Fog lamps                                           
Rear lamps
see Tail lamps                                           
Rear seat head restraints
see Head restraints                                   
Rear view camera  .............................. 174
Cleaning the camera lens  ..............254
Rear window defroster  ..................... 184
Rear window wiper/washer  ............... 94
Recommended tire inflation
pressure  ..................................... 219, 240
Refrigerant, air conditioning  ............ 336
Refueling  ............................................ 212
Regular checks  .................................. 213
Reminder, Seat belt see Seat belts, Telltale                              
Remote control
see Key, SmartKey                                    
Remote door lock (Tele Aid)  ............. 205
Remote door unlock (Tele Aid)  ......... 204
Replacing  
Key  .................................................. 70
Replacing bulbs  ................................. 303
Reporting safety defects  .................... 23
Research Octane Number see RON                                                    
Reserve fuel  
Messages in the multifunction
display  ........................................... 282
Warning lamp ................................. 294
Restraint systems
see Occupant safety                                 
Rims  ........................................... 241, 331
Roadside Assistance  ................... 20, 203
Roller sunblinds  ................................. 184
RON (Research Octane Number)  ..... 337
Roof rack  ............................................ 188
Rubber parts, cleaning  ...................... 256
S
Safety  
Driving safety systems  .....................59
Occupant safety ............................... 36
Reporting defects  ............................ 23
Safety belts
see Seat belts                                           
Satellite radio  .................................... 140
Seat belt force limiter  ......................... 51
Seat belts  ............................................. 47
Children in the vehicle  .....................53
Cleaning ......................................... 256
Fastening  ......................................... 49
Height adjustment  ...........................50
Proper use of  ................................... 48
Rear center seat  .............................. 50
Safety guidelines  ............................. 39
Safety notes ..................................... 47
Telltale  ........................................... 292
Seat heating  ......................................... 81
Seating capacity  ................................ 228
Seats  ..................................................... 78
Adjusting  ......................................... 33
Adjustment  ...................................... 78
Easy-entry/exit feature  ....................83
Heating  ............................................ 81
Memory function .............................. 86
Rear seat bench ............................. 189
Securing cargo  
Cargo tie-down rings ...................... 188
Selective setting
see Key, SmartKey                                    
Selector lever
see Gear selector lever                             
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Carry out the following steps:XIf you are starting the engine with the
SmartKey: Turn the SmartKey in the starter
switch to position  0 and repeat the starting
procedure.XIf you are starting the engine with KEYLESS-
GO: Close any doors that may be open to
allow for better detection of the SmartKey.
or
XRemove the KEYLESS-GO start/stop
button from the starter switch.XStart the engine with the SmartKey as radio
signals from another source may be
interfering with the KEYLESS-GO function.XRepeat the starting procedure.
If the engine does not start after several
starting attempts:
XContact an authorized Mercedes-Benz
Center or call Roadside Assistance.
The engine does not start. You cannot 
hear the starter.
The battery may not be charged sufficiently.
XGet a jump start ( Y page 319).
If the engine will not start despite a jump
start:
XContact an authorized Mercedes-Benz
Center or call Roadside Assistance.
The starter has been exposed to excessive
temperatures.
XLet the starter cool for about 2 minutes.XRepeat the starting procedure.
If the engine does not start after several
starting attempts:
XContact an authorized Mercedes-Benz
Center or call Roadside Assistance.Driving offGWarning!
On slippery road surfaces, never downshift in
order to obtain braking action. This could
result in drive wheel slip and reduced vehicle
control. Your vehicle’s ABS will not prevent
this type of loss of control.
!  Do not run a cold engine at high engine
speeds. Running a cold engine at high
engine speeds may shorten the service life
of the engine. This is not covered by the
Mercedes-Benz Limited Warranty.
!  If an acoustic warning sounds and the
message  Release Parking Brake
appears in the multifunction display when
driving off, you have forgotten to release
the parking brake.
Release the parking brake.
!  Avoid spinning of a drive wheel. This may
cause serious damage to the drivetrain
which is not covered by the Mercedes-Benz
Limited Warranty.
!  Simultaneously depressing the
accelerator pedal and applying the brakes
reduces engine performance and causes
premature brake and drivetrain wear which
is not covered by the Mercedes-Benz
Limited Warranty.
i Once the vehicle is in motion, the
automatic central locking function engages
and the locking knobs in the doors move
down.
The automatic central locking function can
be switched off ( Y page 124).
Automatic transmission
GWarning!
It is dangerous to shift the automatic
transmission out of park position  P or neutral
position  N if the engine speed is higher than
100Driving and parkingControls in detail
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Press buttonW
Xto set the volume=Press button?to activate the Voice Control
System 8?Press button briefly%to cancel the Voice Control
System 8
to go back
to confirm messagesPress and hold button%to select the standard displayAPress button;
=to call up line for menus and to
select menusPress button briefly9
:to select submenu or scroll
through lists
within  Audio menu to select
previous or next track, scene or
stored station
within  Tel menu to switch to
the phone book and select a
name or numberPress and hold button9
:within  Audio menu to select a
track or scene with quick
search or to select previous or
next station in station list or
wave band
within  Tel menu to start the
quick search in the phone bookPress buttonato confirm selection or
messages
Depending on the selected menu, pressing
the buttons on the multifunction steering
wheel will alter what appears in the
multifunction display.
The information available in the multifunction
display is arranged in menus and
accompanying functions and submenus.
The individual functions are then found within
the relevant menu (radio or CD operations
under  Audio, for example). These functions
serve to call up relevant information or to
customize the settings for your vehicle.
It is helpful to think of the menus, and the
functions within each menu, as being
arranged in a circular pattern.
In the  Settings  menu, instead of functions,
you will find a number of submenus for calling
up and changing settings. For instructions on
using these submenus, see “Settings menu”
( Y  page 119).
The number of menus available in the system
depends on which optional equipment is
installed in your vehicle.
Using the control system
XTo select a menu:  Press button =
or  ; .XTo select a submenu:  Press button :
or  9 .8
The Voice Control System is only available with the COMAND system. Refer to separate operating
instructions.Control system111Controls in detailX204_AKB; 3; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T19:16:58+02:00 - Seite 111Z 

:Current fuel consumption;Estimated remaining driving range
Digital speedometer
XPress button = or ; to select the
Trip menu.
XPress button : or 9 to select the
digital speedometer.
Navi menu
The Navi menu contains the functions
needed to operate your navigation system.
XPress button = or ; to select the
Navi menu.
The message shown in the multifunction
display depends on the status of the
navigation system:
RWith the COMAND system switched on
or off and route guidance not activated,
the direction of travel and, if applicable,
the name of the street currently traveled
on appear in the multifunction display.
RWith the COMAND system switched on
and route guidance activated, maneuver
instructions appear in the multifunction
display.
Please refer to separate COMAND system
operating instructions for instructions on how
to activate the route guidance system.
Audio menu
The functions in the Audio menu operate the
audio equipment which you have currently
switched on.
The following functions are available:
RSelecting radio station (Y page 115)
ROperating audio devices/audio media
(Y page 116)
ROperating video DVD (Y page 116)
If the audio system or the COMAND system
is currently switched off, the message Audio 
Off appears in the multifunction display.
XTo adjust the volume: Press button
W or X on the multifunction steering
wheel.
Selecting radio station 
iThe SIRIUS XM Satellite Radio is treated
as a radio application.
Additional optional satellite radio
equipment and a subscription to a satellite
radio service provider are required for
satellite radio operation. Contact an
authorized Mercedes-Benz Center for
details and availability for your vehicle.
For more information on satellite radio
operation, see “Satellite radio”
(Y page 140).
Vehicles with COMAND system:
Refer to separate COMAND system
operating instructions.
XSwitch on the audio system (Y page 132)
and select radio mode.
Vehicles with COMAND system:
Refer to separate COMAND system
operating instructions.
XPress button = or ; to select the
Audio menu.
The currently tuned station appears in the
multifunction display.
Control system115Controls in detailX204_AKB; 3; 23, en-USd2ureepe,Version: 2.11.8.12009-07-16T19:16:58+02:00 - Seite 115Z     

Example illustration for FM radio
:Stored memory position;Station frequency=Wave band settingXSelecting next or previous stored 
station: Press button : or 9 briefly
to select a stored station.
XSelecting next or previous station in 
wave band: Press and hold button : or
9 to select a station.
You can only store new stations using the
corresponding feature on the radio
(Y page 139).
Vehicles with COMAND system:
Refer to separate COMAND system operating
instructions.
You can also operate the radio in the usual
manner.
Operating audio devices/audio media
XSwitch on the audio system and select the
CD or MP3 mode (Y page 146).
Vehicles with COMAND system:
Refer to separate COMAND system
operating instructions.
XPress button = or ; to select the
Audio menu. The settings for the currently
being played audio device/audio media
appear in the multifunction display.
Example illustration
:Disc number;Current trackXSelecting next or previous track: Press
button : or 9 briefly.
XSelecting a track from the track list 
(quick search): Press and hold
button : or 9.
The current track does not appear during
Audio AUX mode operation.
Operating video DVD
This function is only available if your vehicle
is equipped with the COMAND system.
XSwitch on the COMAND system and select
DVD-Video. Refer to separate COMAND
system operating instructions.
XPress button = or ; to select the
Audio menu.
:Disc number;Current sceneXSelecting next or previous scene: Press
button : or 9 briefly.
XSelecting a scene from the scene list 
(quick search): Press and hold
button : or 9.
116Control systemControls in detail
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Item=Clear button (Y page 130)?Audio controller ( Y page 129)ABack button ( Y page 129)
Operating safety
GWarning!
Any alterations made to electronic
components can cause malfunctions.
The radio, amplifier, CD changer, satellite
radio, and telephone 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 at
an authorized Mercedes-Benz Center.
Audio system components
With the audio system you can operate the
following main functions:
R Audio function with the radio, Satellite
radio, disc (CD audio or MP3 mode) and
Audio AUX
R the mobile phone with the phone book
R various system settings
The audio system consists of the following:
R Audio control unit
R Audio display
R Audio controller with buttons  k and
2
In addition, the audio system can also be
operated with the multifunction steering
wheel ( Y page 110).
In these instructions, the keypad (right side
of audio control unit) and the function buttons
are referred to as “buttons”.
Audio control unit
With the audio control unit you can
R switch the audio system on/off
R adjust the volume
R select the operating modes
R enter telephone numbers and accept,
reject, initiate and end telephone calls
R load and eject CDs
126Audio systemControls in detail
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