
IntroductionCentral locking switch 35 Exterior rear view mirrors 75
Product information 7 Automatic central locking 36 Instrument cluster 78
Operator’s manual 8 Emergency unlocking in case of accident 37 Multifunction steering wheel,
Wheretofindit 13 Trunk 38multifunction display
84
Reporting Safety Defects 15 Trunk lid release switch 40Trip and main odometer,
Antitheft alarm system 41 vehicle speed, FSS and engine
Instruments and controlsTow-away alarm 43 oil level indicator 88
Instruments and controls 18 Power seats, front 44
Center console 20 Front head restraints 49 Audio systems 89
Overhead control panel 21 Head restraints, rear 50 Telephone 92
Backrest 51 Navigation system 97
OperationMulticontour seat 52 Trip computer 98
Vehicle keys 24 Heated seats 53 Malfunction message memory 100
Start lock-out 26 Seat belts and integrated restraint system 55 Individual settings 102
General notes on the central
locking system 26Seat belts 55 Setting the audio volume 104
Central locking system 27 Seat belt nonusage warning system 56 Flexible service system (FSS) 105
Radio frequency and infrared
remote control 27BabySmart™ airbag deactivation system 62 Checking engine oil level 108
Locking and unlocking 29 Supplemental restraint system (SRS) 63 Engine oil consumption 109
Choosing global or selective mode
on remote control 29Emergency tensioning retractor (ETR) 63 Exterior lamp switch 110
Opening the trunk 30 Airbags 64 Night security illumination 111
Opening and closing windows
from outside 30Safety guidelines for the seat belt,
emergency tensioning retractor and airbag 69Headlamp cleaning system 112
Panic button 32 Infant and child restraint systems 70 Combination switch 113
Mechanical keys 32 Adjusting telescoping steering column 73 Hazard warning flasher switch 115
Doors
33 Inside rear view mirror 74 Automatic climate control 116
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Instrument cluster displayBRAKE FLUID 217 Coolant level 236
PARKING BRAKE 218 Adding coolant 237
Malfunction and indicator lamps in the
instrument cluster 208ENGINE FAN 218 Windshield washer / headlamp
clean.system 238
On-board diagnostic systemCheck engine malfunction indicator lamp
208COOLANT (coolant level) 219 Windshield and headlamp
washer fluid mixing ratio 238
Brake warning lamp 209 COOLANT (coolant temp.) 220 Wheels 239
Supplemental restraint system STEER. WHEEL ADJUST. 221 Tire replacement 239
(SRS) indicator lamp 210 LIGHT SENSOR 221 Rotating wheels 240
Fuel reserve and fuel cap LIGHTING SYSTEM 222 Spare wheel 241
placement warning 210 WASHER FLUID 223 Changing wheels 242
Electronic stability program(ESP) OIL TEMP. (engine oil temperature) 224 Tire inflation pressure 247
warning lamp 211 ENGINE OIL LEVEL 224 Battery 249
BAS/ESP malfunction indicator lamp 211 ELEC. STABIL. PROG. (Electronic Jump starting 251
ABS malfunction indicator lamp 211 stability program) 226 Towing the vehicle 253
Telescoping steering column – Transmission selector lever,
indicator lamp 212
Practical hintsmanually unlocking 255
Seat belt warning lamp 212 Bulbs 256
Malfunction and indicator lamps in the First aid kit 228 Adjusting headlamp aim 261
center console 212 Shelf below rear window 228 Changing batteries in the
AIRBAG OFF indicator lamp 212 Stowing things in the vehicle 228 electronic main key 264
Roll bar warning lamp 221 Spare wheel, vehicle tools, storage Synchronizing remote control 266
Malfunction and warning messages in compartment 229 Emergency operation of
the multifunction display 213 Vehicle jack 230 sliding/pop-up roof 267
DISPLAY DEFECTIVE 214 Fuses 231
Manual release for fuel filler flap
268
BATTERY/ALTERNATOR 215 Hood 233 Replacing wiper blade insert 268
ABS-SYSTEM 216 Checking engine oil level 234 Trunk lamp 270
BRAKE ASSIST 216 Automatic transmission fluid level 236 Roof rack 270
BRAKE LINING WEAR 217
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Operation
Tow-away alarm 43 Multifunction steering wheel,
Power seats, front 44multifunction display
84
Vehicle keys 24 Front head restraints 49Trip and main odometer, vehicle
speed, FSS and engine
Start lock-out 26 Head restraints, rear 50 oil level indicator 88
General notes on the central
locking system 26Backrest 51 Audio systems 89
Central locking system 27 Multicontour seat 52 Telephone 92
Radio frequency and infrared
remote control 27Heated seats 53 Navigation system 97
Locking and unlocking 29 Seat belts and integrated restraint system 55 Trip computer 98
Choosing global or selective mode
on remote control 29Seat belts 55 Malfunction message memory 100
Opening the trunk 30 Seat belt nonusage warning system 56 Individual settings 102
Opening and closing windows
from outside 30BabySmart™ airbag deactivation system 62 Setting the audio volume 104
Panic button 32 Supplemental restraint system (SRS) 63 Flexible service system (FSS) 105
Mechanical keys 32 Emergency tensioning retractor (ETR) 63 Checking engine oil level 108
Doors 33 Airbags 64
Central locking switch 35 Safety guidelines for the seat belt,
emergency tensioning retractor and airbag 69
Automatic central locking 36 Infant and child restraint systems 70
Emergency unlocking in case of Adjusting telescoping steering column 73
accident 37 Inside rear view mirror 74
Trunk 38 Exterior rear view mirrors 75
Trunk lid release switch 40 Instrument cluster 78
Antitheft alarm system 41
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Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Ve h i c l e  k ey s
Included with your vehicle are: 
•2 electronic main keys with integrated radio 
frequency and infrared remote controls plus 
removable mechanical key.
The locking tabs for the mechanical key portion of 
the two electronic main keys are a different color to 
help distinguish it.
•1 electronic reserve key without remote control 
functions, plus removable mechanical key.
Wa r n i n g !
When leaving the vehicle always remove the 
electronic key from the steering lock, 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.Electronic main key
The electronic main key has an integrated radio 
frequency and infrared remote control, plus removable 
mechanical key.
The remote control (1) operates all locks on the vehicle.
The mechanical key (2) works only in the driver’s door, 
trunk, and storage compartment locks.
P80.35-2031-26
The mechanical key (2) 
lock can be removed b
y
 sliding it out of the remote control. 
To  d o  s o ,  m o ve(3) 
in direction of arrow
( 5).  and slide the mechanical key (2) in direction
 of arrow
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Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index When using the mechanical key (2) for lock operations, 
it can be removed by sliding it out of the remote control. 
To do so, move locking tab (3) to the right and slide the 
mechanical key (2) in direction of arrow (4).
The remote control transmitter is located in the 
electronic main key.
The infrared receivers are located in the door handles.
Notes:
Remove the mechanical key from the electronic main 
key when using valet parking service. To prevent access 
to trunk or storage compartments lock them separately 
and retain the mechanical key. The mechanical key (2) 
lock can be removed b
y
 sliding it out of the remote control. 
To  d o  s o ,  m o ve(3) 
in direction of arrow
( 5).  and slide the mechanical key (2) in direction
 of arrowElectronic reserve key
The electronic reserve key is without remote control 
functions, but with removable mechanical key.
The electronic reserve key (1) works only in the steering 
lock. There are no batteries inside the electronic reserve 
ke y.
The mechanical key (2) works only in the driver’s door, 
trunk, and storage compartment locks.
To use the mechanical key (2), remove it from its 
electronic reserve key (1).
P80.30-2069-26
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Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Note:
We recommend that you carry the electronic reserve 
key plus mechanical key with you and keep it in a safe 
place (e.g. your wallet) so that it is always handy. Never 
leave the electronic reserve key in the vehicle.
Obtaining replacement keys
Your vehicle is equipped with a theft deterrent locking 
system requiring a special key manufacturing process. 
For security reasons, replacement keys can only be 
obtained from your authorized Mercedes-Benz Center.
Start lock-out
Important!
Removing the electronic key from the steering lock 
activates the start lock-out. The engine cannot be 
started.
Inserting the electronic key in the steering lock 
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 steering lock, 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 door 
handle. Check the batteries of the electronic main 
key, see page264, or synchronize the remote 
control, see page266.
•Use the mechanical key to unlock the driver’s door. 
To start the engine, insert the electronic main key in 
the steering lock. There could be a slight delay until 
the electronic main key can be turned in the 
steering lock.
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Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Central locking system
Radio frequency and infrared remote control
The electronic main key has an integrated radio 
frequency and infrared remote control.
Due to the extended operational range of the remote 
control, it could be possible to unintentionally lock or 
unlock the vehicle by pressing the transmit button. If 
one of the transmit buttons is pressed, the battery check 
lamp lights up briefly – indicating that the batteries are 
in order. 
The vehicle doors, trunk and fuel filler flap can be 
centrally locked and unlocked via remote control.
Opening and closing the windows remotely can only be 
done with the infrared portion of the remote control. 
Aim transmitter eye at a receiver (6 or 7), press and 
hold transmit button Œor ‹.
If the electronic key is inserted in steering lock, the 
vehicle cannot be locked or unlocked with the remote 
control.1Transmit button
‹ Locking
Œ Unlocking
Š Opening trunk (if not separately locked)
2
Lamp for battery check and function control 3PANIC button
4
Transmitter eye
5
Release button
 for mechanical key
P80.30-2070-26
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Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Locking and unlocking with remote control
Unlocking:
Press transmit button Œ. All turn signal lamps blink 
once to indicate that the vehicle is unlocked.
The remote control can be programmed for two kinds of 
unlocking modes (see below):
Selective unlocking mode –
Press transmit button Œ once to unlock driver’s door 
and fuel filler flap.
Press transmit button Œ twice to unlock both doors, 
fuel filler flap, and trunk.
Global unlocking mode –
Press transmit button Œ once to unlock both doors, 
fuel filler flap, and trunk.
Notes:
If the trunk was previously locked separately, it will 
remain locked, see page 38.
The presently active unlocking mode (selective or 
global) can only be determined by unlocking the vehicle 
with the remote control (see below for changing mode).If within 40 seconds of unlocking with the remote 
control, neither door nor trunk is opened, the electronic 
key is not inserted in the steering lock, or the central 
locking switch is not activated, the vehicle will 
automatically lock.
Locking:
Press transmit button ‹ once. All turn signal lamps 
blink three times to indicate that the vehicle is locked.
If they do not blink three times, a door or trunk is not 
properly closed.
Note:
If the vehicle cannot be locked or unlocked by pressing 
the transmit button, then it may be necessary to change 
the batteries in the electronic main key (if ok, battery 
check lamp in electronic main key will light briefly 
when pressing transmit button) or to synchronize the 
remote control, see pages264  and266.
Choosing global or selective mode on remote control
Press and hold transmit buttons ‹ and Œ 
simultaneously for approx. 6 seconds to reprogram the 
remote control. Battery check lamp will blink two times 
indicating the completed mode change.
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