
34 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. See page 363 for checking batteries.
The vehicle doors, trunk and fuel filler flap can be 
centrally locked and unlocked via remote control.
Opening and closing the windows and sliding/pop-up 
roof and switching on the driver’s seat ventilation 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 buttonŒor‹, see page 45.
With vehicle centrally locked, the trunk can also be 
opened by using the remote control.
If the electronic key is inserted in starter switch, the 
vehicle cannot be locked or unlocked, and the trunk lid 
cannot be opened with the remote control.1Transmit button
‹Locking
ŒUnlocking
ŠOpening trunk (if not separately locked)
2Lamp for battery check (see page 363 for changing 
batteries if it does not light up briefly)
3PANIC button
4Transmitter eye
5Locking tab for mechanical key
P80.35-2032-26
24
3
5
1 

39 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index •Opening the driver’s door with the engine shut off 
and no electronic key in the starter switch, the 
message “CHIP-CARD –  DO NOT FORGET” appears 
as a reminder, see page 318. 
Important
In the case of a malfunction in the KEYLESS-GO-system, 
we recommend that you carry the electronic key plus 
mechanical key with you and keep them in a safe place 
so that they are always handy. Never leave the electronic 
key in the vehicle.Notes:
The KEYLESS-GO-function also permits closing of 
windows and sliding/pop-up roof (convenience feature), 
see page 46.
With the KEYLESS-GO-card in close proximity (approx. 
3 ft. [1 m]) of the vehicle, aiming a jet of water at a door 
handle (e.g. when washing the vehicle) or cleaning 
snow from a door, could lock or unlock the vehicle 
inadvertently.
To prevent a possible inadvertent lockout, the trunk lid 
will open automatically if a KEYLESS-GO-card is 
recognized in the area of the rear shelf or inside the 
trunk. 

45 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Opening and closing windows and 
sliding/pop-up roof from outside 
(summer opening/convenience feature)
Aim transmitter eye of remote control at a door receiver.
Summer opening:
(Operation with electronic main key)
The sliding/pop-up roof and all side windows can be 
opened and the driver’s seat ventilation automatically 
switches on. See page 79 for seat ventilation.
Continue to press transmit buttonŒ after unlocking 
the vehicle.
The windows and sliding/pop-up roof begin to open 
after approx. 1 second. The driver’s seat ventilation 
automatically switches on. See page 79 for seat 
ventilation.
To interrupt opening procedure, release transmit 
button.
Convenience feature:
(Operation with electronic main key)
The sliding/pop-up roof and the side windows can be 
closed.Continue to press transmit button‹ after locking 
the vehicle.
The windows and sliding/pop-up roof begin to close 
after approx. 1 second.
To interrupt closing procedure, release transmit button.
Ensure that all side windows and the sliding/pop-up 
roof are properly closed before leaving the vehicle.
Wa r n i n g !
Never operate the windows or sliding/pop-up roof if 
there is the possibility of anyone being harmed by 
the opening or closing procedure.In case the procedure causes potential danger, the 
procedure can be immediately halted by releasing 
the remote control button. To reverse direction of 
movement pressŒ for opening or‹ for 
closing. 

46 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Note:
If the windows and sliding/pop-up roof cannot be 
operated automatically by pressing the transmit button 
of the remote control 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 transmitting), or to synchronize the remote 
control, see page 363 and 365.
Convenience feature
(Operation with KEYLESS-GO)
Continue to press lock button on door handle after 
locking the vehicle.
The windows and sliding/pop-up roof begin to close 
after approx. 1 second.
To interrupt closing procedure, release lock button. To 
reverse direction (within 2 seconds after closing), pull 
and hold door handle. Opening of windows starts and 
continues for as long as the door handle is held but the 
door not opened.
Ensure that all side windows and the sliding/pop-up 
roof are properly closed before leaving the vehicle.
Wa r n i n g !
Never operate the windows or sliding/pop-up roof if 
there is the possibility of anyone being harmed by 
the closing procedure.In case the procedure causes potential danger, the 
procedure can be immediately halted by releasing 
the lock button. To reverse direction of movement 
pull and hold outside door handle. 

49 Central locking system
Te ch n ica 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 door while the central locking 
system is in the:
•selective unlocking mode, only that individual door 
is unlocked. The remaining door, the trunk and fuel 
filler f lap remain locked.
•global unlocking mode, both doors, the trunk and 
fuel filler flap are unlocked.
Notes:
When opening a door, the door window and rear side 
window lower slightly. After closing the door, the 
windows close again.
In case of a malfunction in the central locking system 
the doors can be locked and unlocked individually.
To lock, push down lock button 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.
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 main key. 

82 Restraint systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Seat belts and integrated restraint system
Your vehicle is equipped with seat belts for all seats, 
emergency tensioning retractors, dual front airbags, 
side impact airbags for driver, front and rear 
passengers, and head protective window curtain 
airbags. Their protective functions are designed to 
complement one another.
Seat belts
Important!
Laws in most states and all Canadian provinces require 
seat belt use. 
All states and provinces require use of child restraints 
that comply with U.S. Federal Motor Vehicle Safety 
Standard 213 and Canadian Motor Vehicle Safety 
Standard 213.
All child restraints systems are designed to be secured 
in vehicle seats by lap belts or the lap belt portion of a 
lap-shoulder belt.
For your safety and that of your passengers we strongly 
recommend their use.
Wa r n i n g !
Children 12 years old and under must never ride in 
the front seat, except in a Mercedes-Benz 
authorized BabySmart
TM compatible child seat, 
which operates with the BabySmart
TM system 
installed in the vehicle to deactivate the passenger 
side front airbag when it is properly installed. 
Otherwise they will be struck by the airbag when it 
inflates in a crash. If this happens, serious or fatal 
injury will result.
According to accident statistics, children are safer 
when properly restrained in the rear seating 
positions than in the front seating positions. 
Infants and small children must ride in back seats 
and be seated in an appropriate infant or child 
restraint system, which is properly secured with 
the vehicle’s seat belt, fully in accordance with the 
child seat manufacturer’s instructions.A child’s risk of serious or fatal injuries is 
significantly increased if the child restraints are 
not properly secured in the vehicle and the child is 
not properly secured in the child restraint. 

86 Restraint systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Operation of seat belts
The inertia reel stops the belt from unwinding during 
sudden stops or when quickly pulling on the belt.
The locking function of the reel may be checked by 
quickly pulling out the belt.
Caution!
For safety reasons, avoid adjusting the seat or seat back 
into positions which could affect the correct seat belt 
positioning.
Unfastening of seat belts
Press release button (3) in the belt buckle (2).
Allow the retractor to completely rewind the seat belt by 
guiding the latch plate (1).
Wa r n i n g !
USE SEAT BELTS PROPERLY.• Seat belts can only work when used properly. 
Never wear seat belts in any other way than as 
described in this section, as that could result 
in serious injuries in case of an accident.• Each occupant should wear their seat belt at all 
times, because seat belts help reduce the 
likelihood of and potential severity of injuries 
in accidents, including rollovers. The 
integrated restraint system includes “SRS” 
(driver airbag, front passenger airbag, side 
impact airbags, head protection window 
curtain airbags for side windows), “ETR” (seat 
belt emergency tensioning retractors), and 
front seat knee bolsters. The system is 
designed to enhance the protection offered to 
properly belted occupants in certain frontal 
(front airbags) and side (side impact and 
window curtain airbags) impacts which exceed 
preset deployment thresholds. 

92 Restraint systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Airbags
Front airbags1Driver airbag
2Front passenger airbag
The most effective occupant restraint system yet 
developed for use in production vehicles is the seat belt. 
In some cases, however, the protective effect of a seat 
belt can be further enhanced by an airbag.
In conjunction with wearing the seat belts, the driver 
and front passenger airbags can provide increased 
protection for the driver and front passenger in certain 
frontal impacts exceeding preset thresholds.
Side impact and head protection window curtain airbags 
can provide increased protection to belted occupants on 
the impacted side of the vehicle in side impacts 
exceeding its preset threshold.
The operational readiness of the airbag system is 
verified by the indicator lamp “SRS” in the instrument 
cluster when turning the electronic key in starter switch 
to position 1 or 2. If no fault is detected, the lamp will go 
out after approximately 4 seconds; after the lamp goes 
out, the system continues to monitor the components 
and circuitry of the airbag system and will indicate a 
malfunction by coming on again. If the lamp does not 
2
1