
33 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Central locking system
Radio frequency and infrared remote control
The electronic 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 371 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 button Œor ‹, seepage43.
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
Œ Unlocking
Š Opening trunk (if not separately locked)
2Lamp for battery check (see page 371 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 

37 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index •If the KEYLESS-GO-card is removed from the vehicle 
while the engine is running, or by placing the card 
in front of the center armrest (see page 198), the 
message “CHIP-CARD – NOT RECOGNIZED!” will 
appear repeatedly for approx. 2 seconds in the 
multifunction display, see page 328.
If the message “CHIP - CARD – NOT RECOGNIZED” 
is ignored for an extended of time (approx. 
15 minutes), the engine could stop by itself during a 
vehicle stop (e.g. traffic light). The vehicle can then 
no longer be centrally locked or the engine 
restarted. You must first find the card. Start the 
engine again. See page 230.
•Do not forget, the engine can be started by anyone 
with a KEYLESS-GO-card that is left inside the 
vehicle. Leaving the chip-card behind when exiting 
and locking the vehicle, the message “CHIP-CARD –
STILL IN VEHICLE” appears in the multifunction 
display, see page 328.
•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 328. 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 44.
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. 

43 Central locking system
Te ch n i c a 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 key)
The sliding / pop-up roof and all side windows can be 
opened and the driver’s seat ventilation automatically 
switches on. See page 74 for seat ventilation.
Continue to press transmit button Œ after unlocking 
the vehicle.
The windows and sliding/pop-up roof begin to open 
after approximately 1 second. The driver’s seat 
ventilation automatically switches on. See page 74 for 
seat ventilation.
To interrupt opening procedure, release transmit 
button.Convenience feature:
(Operation with electronic 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 approximately 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 press Œ for opening or ‹ for 
closing. 

44 Central locking system
Te ch n i c a 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  t he r emote con trol t hen  it may b e ne ces sary  to change 
the batteries in the electronic key (if ok, battery check 
lamp in electronic key will light briefly when pressing 
transmit button), or to synchronize the remote control, 
see page 371 and 373.
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. 

80 Seats
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Power seat, setting passenger seat position from rear
The switch is located on the right rear door.
1Front passenger seat adjustment
2Rear seat adjustmentTurn the electronic key in starter switch to position 1 
or 2.
Press button 1 to adjust the front passenger seat:
3Fore / aft adjustment
4Backrest tilt
5Head restraint height
6Seat, up / down
Press button 2 to adjust the rear seat. 
See page 79 for rear seat adjustment.
Note:
Setting the passenger seat position from the rear is not 
possible if you deactivate the operation of rear door 
windows, see page 186.
Do not move the front passenger seat completely 
forward if objects are stored in the parcel net in the 
front passenger-side footwell. Items in the net may be 
damaged. 
5
3
4
4
66
3
1
2
P54.00-2004-26 

81 Restraint systems
Te ch n i c a 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 for all outboard seat 
belts, dual front airbags, side impact airbags for driver, 
front and outer 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 i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
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.• E ach oc c upan t s houl d  wear t hei r s ea t bel t a t al l 
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 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.
• Never wear the shoulder belt under your arm, 
against your neck or off your shoulder. In a 
crash, your body would move too far forward. 
That would increase the chance of head and 
neck injuries. The belt would also apply too 
much force to the ribs or abdomen, which 
could severely injure internal organs such as 
your liver or spleen.• Never wear belts over rigid or breakable 
objects in or on your clothing, such as 
eyeglasses, pens, keys etc., as these might 
cause injuries.• Position the lap belt as low as possible on your 
hips and not across the abdomen. If the belt is 
positioned across your abdomen, it could cause 
serious injuries in a crash.• Each seat belt should never be used for more 
than one person at a time. Do not fasten a seat 
belt around a person and another person or 
other objects.• Belts should not be worn twisted. In a crash, 
you wouldn’t have the full width of the belt to 
manage impact forces. The twisted belt against 
your body could cause injuries. 

91 Restraint systems
Te ch n i c a 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 
33
P91.60-2289-27