Page 34 of 317

31 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Each individual door and the liftgate must be locked 
with the respective door lock button – the driver’s door 
can only be locked when it is closed.
Notes:
The alarm sounds when unlocking the driver’s door. 
Cancel alarm by turning key in steering lock to 
position 1, or with the remote control by pressing 
buttonŒ.
If the vehicle has previously been locked from the 
outside, only the door being opened from the inside will 
unlock, and the alarm will come on. The remaining 
doors, the liftgate and fuel filler flap remain locked.
In case of a malfunction in the central locking system 
the doors can be locked and unlocked individually.To lock, push down lock buttons and turn mechanical 
key in driver’s door lock to position 3. In addition lock 
the liftgate.
To unlock, pull inside door handles and turn mechanical 
key in driver’s door lock to position 2.
Rear doors, previously centrally locked, can be opened 
from inside by first unlocking the vehicle with the 
central locking switch, see page 32, or by first pulling 
up the door lock button.
If the fuel filler flap cannot be opened, see page 274. 
     
        
        Page 35 of 317
32 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Central locking switch
1Locking
2Unl ock ing
The central locking switch is located on the center 
console.
The doors and trunk can only be locked with the central 
locking switch, if the front doors are closed.
If the vehicle was previously locked with the remote 
control, the doors and liftgate cannot be unlocked with 
the central locking switch.Automatic central locking
The central locking switch also operates the automatic 
central locking.
With the automatic central locking system activated and 
the engine running, the doors and trunk are locked at 
vehicle speeds of approximately 9 mph (15 km / h) or 
more.
To  a c t i v a te :
With key in steering lock position 2 hold upper portion 
of switch (1) for a minimum of 5 seconds.
To deactivate:
With key in steering lock position 2 hold lower portion 
of switch (2) for a minimum of 5 seconds. 
     
        
        Page 36 of 317

33 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Notes:
If doors are unlocked with the central locking switch 
after activating the automatic central locking, and 
neither door is opened, then the doors remain unlocked 
even at vehicle speeds of approximately 9 mph 
(15 km / h) or more.
If a door is opened from the inside at speeds of 
approximately 9mph (15km/h) or less with the 
automatic central locking activated, the door will again 
be automatically locked at speeds of approximately 
9 mph (15 km / h) or more.
Important!
When towing the vehicle, or with the vehicle on a 
dynamometer test stand, please, note the following:
With the engine running, the vehicle doors will lock if 
the left front wheel spins at vehicle speeds of 
approximately 9 mph (15 km / h) or more.
To prevent vehicle door locks from locking, deactivate 
the automatic central locking.Emergency unlocking in case of accident
The doors unlock automatically a short time after an 
accident in which an airbag or emergency tensioning 
retractor deploys (this is intended to aid rescue and 
exit). However, the key must still be in the steering lock 
position 1 or 2.
Additionally the hazard warning flashers turn on 
automatically and the interior lights switch on for 
approximately 30 minutes. 
     
        
        Page 37 of 317
34 Central locking system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Liftgate
1Grip molding
2Handle, outside
3Recessed grip
To  o pen :
From outside of vehicle, pull on handle (2).
To  cl os e:
Pull down on recessed grip (3), and close by using the 
grip molding (1).1Handle, inside
2Locking
3Unlocking
Important!
In case of danger, the unlocked liftgate can be opened 
with the inside or outside handle.
Only drive with the liftgate closed as otherwise exhaust 
fumes may enter the vehicle interior. 
     
        
        Page 38 of 317

35 Antitheft alarm system
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Antitheft alarm system
The indicator lamp is located in the center console.
The antitheft alarm is automatically armed or disarmed 
with the remote control by locking or unlocking the 
vehicle.
The antitheft alarm is armed within approximately 
15 seconds after locking the vehicle with the remote 
control.
A blinking lamp in the center console indicates that the 
alarm is armed.
Notes:
Use of the key in the front door locks does not arm or 
disarm the antitheft alarm system.
The alarm sounds when unlocking the driver’s door 
with the mechanical key. Cancel alarm by turning key in 
steering lock to position 1, or with the remote control by 
pressing buttonŒ.
If the vehicle battery voltage falls below 10 volts, the 
alarm is automatically canceled and the antitheft alarm 
system is disarmed. When the voltage is above this 
value again, the antitheft alarm system is armed again.Operation:
Once the alarm system has been armed, the turn signal 
lamps will flash rapidly (approximately 3 minutes) and 
the horn will sound intermittently (approximately 
30 seconds) when someone:
•opens a door,
•opens the liftgate,
•opens the hood,
•breaks a window,
•attempts to raise the vehicle.
The alarm will stay on even if the activating element (a 
door, for example) is immediately closed.
If the alarm stays on for more than 20 seconds, an 
emergency call is initiated automatically. See Tele Aid 
on page 148.
Note:
The alarm system will cycle three times when triggered.
The interior lights are automatically switched on when 
the alarm comes on and go out when canceling the 
alarm. 
     
        
        Page 39 of 317

36 Tow-away protection
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Tow-away alarm and glass breakage sensor
The switch is located in the overhead console.
The tow-away alarm and glass breakage sensor are part 
of the antitheft alarm system.
Once the alarm system has been armed, the turn signal 
lamps will flash rapidly and the horn will sound when 
someone attempts to raise the vehicle, or breaks a 
window and reaches into the passenger compartment.The alarm will last approximately 3 minutes in the form 
of rapidly flashing turn signal lamps. At the same time 
the horn will sound for approximately 30 seconds. The 
alarm will stay on even if the vehicle is immediately 
lowered.
If the alarm stays on for more than 20 seconds, an 
emergency call is initiated automatically. See Tele Aid 
on page 148.
To prevent triggering the tow-away alarm feature, switch 
off the tow-away alarm and glass breakage sensor before 
towing the vehicle, or when parking on a surface subject 
to movement, such as a ferry or auto train.
To do so, turn key in steering lock to position 1, then 
return it to position 0 and remove key from steering 
lock.
Within 30 seconds, push left or right button. (On 
vehicles equipped with optional trip computer, push 
RESET or MODE button, display shows OFF.)
Exit vehicle, and lock vehicle with remote control.
The tow-away alarm and glass breakage sensor remain 
switched off until the key is inserted in steering lock 
and turned to position 1. 
     
        
        Page 40 of 317

37 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Seats, front
Caution!
Do not remove head restraints except when mounting 
seat covers. For removal see page 43. Whenever head 
restraints have been removed be sure to reinstall them 
before driving.
Wa r n i n g !
Do not adjust the driver’s seat while driving. 
Adjusting the seat while driving could cause the 
driver to lose control of the vehicle.Never ride in a moving vehicle with the backrest 
reclined. Sitting in an excessively reclined position 
can be dangerous. You could slide under the seat 
belt in a collision. If you slide under it, the belt 
would apply force at the abdomen or neck. That 
could cause serious or even fatal injuries. The 
backrest and seat belt provide the best restraint 
when the wearer is in an upright position and the 
belt is properly positioned on the body.Never place hands under seat or near any moving 
parts while a seat is being adjusted.
Wa r n i n g !
When leaving the vehicle always remove the 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. 
     
        
        Page 41 of 317

38 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Important!
Prior to operating the vehicle, the driver should adjust 
the seat height for proper vision as well as fore / aft 
placement and backrest angle to insure adequate 
control, reach, operation, and comfort. The head 
restraint should also be adjusted for proper height. See 
also airbag section on page 56 for proper seat 
positioning.
In addition, also adjust the steering wheel to ensure 
adequate control, reach, operation, and comfort.
Both the inside and outside rear view mirrors should be 
adjusted for adequate rearward vision.
Fasten seat belts. Infants and small children should be 
seated in a properly secured restraint system that 
complies with U.S. Federal Motor Vehicle Safety 
Standard 213 and Canadian Motor Vehicle Safety 
Standard 213.
All seat, head restraint, steering wheel, and rear view 
mirror adjustments as well as fastening of seat belts 
should be done before the vehicle is put into motion.
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 can 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 the 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.