
1 Contents
IntroductionProduct information  .......................... 7
Operator’s manual  ............................. 8
Where to find it  ................................ 13
Reporting Safety Defects  ................ 15Instruments and controlsInstruments and controls  ............... 18
Door control panel  ....................... 20
Overhead control panel  ............... 21
Dashboard  ..................................... 22
Center console  .............................. 24OperationVehicle keys  ...................................... 28
Start lock-out  .................................... 30
General notes on the 
central locking system  ............... 30
Central locking system  ................... 31
Radio frequency and 
infrared remote control  ............... 31
Locking and unlocking ................ 33Choosing global or selective 
mode on remote control  ............. 33
Opening the trunk  ....................... 34
Opening and closing windows 
and sliding / pop-up roof 
from outside  ................................. 35
Panic button  ................................. 36
Mechanical keys  .......................... 36
Doors  ................................................. 37
Central locking switch .................... 39
Automatic central locking .............. 40
Emergency unlocking 
in case of accident  ...................... 40
Trunk ..................................................41
Trunk lid emergency release  ........ 43
Trunk lid emergency release  ........ 44
Trunk lid release switch  ................ 45
Trunk lamp ....................................... 45
Antitheft alarm system ................... 46
Tow-away alarm  ............................... 47
Easy-entry/exit feature  .................. 48
Front seat adjustment ..................... 49
Removal and installation of 
front seat head restraints  .......... 55Multicontour seat  ............................ 57
Heated seats  ..................................... 58
Rear seat head restraints ................ 60
Seat belts and integrated 
restraint system  .......................... 63
Seat belts ........................................... 63
Seat belt nonusage 
warning system  ........................... 64
BabySmart
TM airbag 
deactivation system  .................... 70
Supplemental Restraint 
System (SRS)  ............................... 71
Emergency tensioning 
retractor (ETR) ............................. 72
Airbags  .............................................. 73
Safety guidelines for the seat 
belt, emergency tensioning 
retractor and airbag .................... 81
Infant and child 
restraint systems ......................... 83
Steering wheel adjustment 
(manual)  ....................................... 88
Steering wheel adjustment 
(electrical)  .................................... 89
Rear view mirrors  ............................ 90
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24 Instruments and controls
Te ch n i c a l
data Instruments 
and controlsOperation DrivingInstrument 
cluster displayPractical hints Car care Index
Center console1Left front seat heater switch, see page 58
2Rear window sunshade switch (optional), see 
page 205 
3ESP (electronic stability program) control switch, 
see page 278
4Hazard warning flasher switch, see page 151
5Central locking switch, see page 39
6Rear seat head restraints switch, see page 60
7Antitheft alarm system, see page 46 
Switch for tow-away protection, see page 47
8Right front seat heater switch, see page 58
9AIRBAG OFF indicator lamp, see page 292
10COMAND system (optional), see separate 
operating instructions, or
audio system, see page 173
11Climate control (C 240), see page 152
Automatic climate control (C 320) see page 160
Rear window defroster, see page 170
P 68.10-2501-27
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26 Contents - Operation
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
OperationVehicle keys  ...................................... 28
Start lock-out  .................................... 30
General notes on the 
central locking system  ............... 30
Central locking system  ................... 31
Radio frequency and 
infrared remote control  ............... 31
Locking and unlocking ................ 33
Choosing global or selective 
mode on remote control  .............. 33
Opening the trunk  ....................... 34
Opening and closing windows 
and sliding / pop-up roof 
from outside  .................................. 35
Panic button  .................................. 36
Mechanical keys  ........................... 36
Doors .................................................. 37
Central locking switch  .................... 39
Automatic central locking  .............. 40
Emergency unlocking 
in case of accident  ...................... 40
Trunk  ................................................. 41Trunk lid emergency release  ........ 43
Trunk lid emergency release  ........ 44
Trunk lid release switch  ................ 45
Trunk lamp ....................................... 45
Antitheft alarm system ................... 46
Tow-away alarm  ............................... 47
Easy-entry/exit feature  .................. 48
Front seat adjustment ..................... 49
Removal and installation of 
front seat head restraints  .......... 55
Multicontour seat  ............................ 57
Heated seats  ..................................... 58
Rear seat head restraints  ............... 60
Seat belts and integrated 
restraint system  .......................... 63
Seat belts  .......................................... 63
Seat belt nonusage 
warning system  .......................... 64
BabySmart
TM airbag 
deactivation system  ................... 70
Supplemental Restraint 
System (SRS)  ................................ 71
Emergency tensioning 
retractor (ETR)  ............................ 72Airbags  .............................................. 73
Safety guidelines for the seat 
belt, emergency tensioning 
retractor and airbag .................... 81
Infant and child 
restraint systems ......................... 83
Steering wheel adjustment 
(manual)  ....................................... 88
Steering wheel adjustment 
(electrical)  .................................... 89
Rear view mirrors  ............................ 90
Instrument cluster  ........................... 98
Multifunction steering wheel, 
multifunction display  ............... 102
Trip and main odometer
and sub menu  ............................ 106
Audio systems  ................................ 108
Radio  ............................................ 108
CD player  ..................................... 109
Cassette player  ............................110
Telephone  ......................................... 111
Navigation system ...........................116
Trip computer  ..................................117
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30 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Start lock-out
Important!
Removing the electronic key from the starter switch 
activates the start lock-out. The engine cannot be 
started.
Inserting the electronic key in the starter switch 
deactivates the start lock-out.
Note:
In case the engine cannot be started (vehicle’s battery is 
in order), the system is not operational. Contact an 
authorized Mercedes-Benz Center or call 1-800-FOR-
MERCedes (in the USA), or 1-800-387-0100 (in Canada).General notes on the central locking system
If the electronic key is inserted in the starter switch, the 
vehicle cannot be locked or unlocked with the remote 
control.
If the vehicle cannot be locked or unlocked:
•Aim transmitter eye at a receiver of either front door 
handle. Check the batteries of the electronic key, see 
page 357, or synchronize the electronic key, see 
page 359.
•Use the mechanical key to unlock the vehicle. To 
start engine, insert the electronic key in the starter 
switch. There could be a slight delay until the 
electronic key can be turned in the starter switch.
Important!
When unlocking the driver’s door with the mechanical 
key, the exterior lamps will flash and the alarm will 
sound.
To cancel the alarm, insert the electronic key in the 
starter switch or press buttonŒ or‹ on the 
electronic key.
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36 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Panic button
To activate press and hold button (1) for at least one 
second. An audible alarm and blinking exterior lamps 
will operate for approximately 3 minutes.
To deactivate press button (1) again, or insert electronic 
key in starter switch.Note:
For operation in the USA only: This device complies 
with Part 15 of the FCC Rules. Operation is subject to 
the following two conditions:
(1) This device may not cause harmful interference, 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.
Mechanical keys
The mechanical keys work only in driver’s door, trunk, 
and glove box locks.
Notes:
The mechanical key does not operate the central locking 
system or antitheft alarm system.
The fuel filler flap cannot be locked or unlocked with 
the mechanical key.
If the fuel filler flap cannot be opened, see page 360.
P 80.35-2035-26
1
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37 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Doors
1Opening – pull handle
2Unlocking driver’s door
3Locking driver’s door
Important!
The mechanical key does not operate the central locking 
system or antitheft alarm system.4Individual door from inside:
Push lock button down to lock.
5Front door from inside:
Pull handle to unlock.
When you lock the driver’s door with the mechanical 
key, the door lock button should move down.
Each individual door must be locked with the respective 
door lock button – the driver’s door can only be locked 
when it is closed.
2
1
3
4
5
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38 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
If the vehicle has previously been locked from the 
outside, opening a door from the inside will trigger the 
alarm. When opening a front door while the central 
locking system is in the:
•selective unlocking mode, only that individual door 
is unlocked. The remaining doors, the trunk and 
fuel filler flap remain locked.
•global unlocking mode, all doors, the trunk and fuel 
filler flap are unlocked.
Notes:
In case of a malfunction in the central locking system 
the doors can be locked and unlocked individually.
To lock, push down lock buttons or turn mechanical key 
in driver’s door lock to position 3. In addition lock the 
trunk.To unlock, pull inside door handles or turn mechanical 
key in driver’s door lock to position 2.
Rear doors can only be opened from inside by first 
pulling up the door lock button.
When unlocking the driver’s door with the mechanical 
key, the exterior lamps will flash and the alarm will 
sound.
To cancel the alarm, insert the electronic key in the 
starter switch or press buttonŒ or‹ on the 
electronic key.
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39 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Central locking switch
1Locking
2Unlocking
The central locking switch is located in the center 
console.
The doors and trunk can only be locked with the central 
locking switch, if both front doors are closed.
If the vehicle was previously locked with the central 
locking switch, while in the selective remote control 
mode, only the door opened from the inside is unlocked.If the vehicle was previously locked with the central 
locking switch, while in the global remote control mode, 
the complete vehicle is unlocked when a door is opened 
from the inside.
Notes:
If the vehicle was previously locked with the remote 
control, the doors and trunk cannot be unlocked with 
the central locking switch.
The fuel filler flap cannot be locked or unlocked with 
the central locking switch.
If the vehicle has previously been locked from the 
outside, opening a door from the inside will trigger the 
alarm. To cancel the alarm, insert the electronic key in 
the starter switch or press buttonŒ or‹ on the 
electronic key.
P 54.25-2417-26
Wa r n i n g !
When leaving the vehicle always remove the 
electronic key from the starter switch, and lock 
your vehicle. Do not leave children unattended in 
the vehicle, or with access to an unlocked vehicle. 
Unsupervised use of vehicle equipment may cause 
serious personal injury.
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