Page 85 of 464

85 Safety and Security
Anti-theft systems
Anti-theft systems
Immobilizer
The immobilizer prevents unauthorized 
persons from starting your vehicle.
Activating
Remove the SmartKey from the starter 
switch.
Deactivating
Switch on the ignition (
page 35).
Anti-theft alarm system
Once the alarm system has been armed, a 
visual and audible alarm is triggered when 
someone opens
a door
the trunk lid
the hood
the glove box
the storage compartment in the center 
console
The alarm system will also be triggered 
when
someone attempts to raise the vehicle
opening the vehicle with the 
mechanical key
iStarting the engine will also deactivate 
the immobilizer.
In case the engine cannot be started 
(yet the vehicle’s battery is charged), 
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).
iThe alarm will stay on, even if the acti-
vating element (e.g. a door) is immedi-
ately closed.iIf the alarm stays on for more than 
30 seconds, a call to the Response 
Center is initiated automatically by the 
Tele Aid system (
page 257), provided 
Tele Aid service was subscribed to and 
properly activated, and that necessary 
cellular service and GPS coverage are 
available (
page 257). 
     
        
        Page 87 of 464

87 Safety and Security
Anti-theft systems
Arming tow-away alarm
Lock your vehicle with the SmartKey.
The tow-away alarm is automatically 
armed after about 30 seconds.
Disarming tow-away alarm
To prevent triggering the tow-away alarm, 
switch off the tow-away alarm feature be-
fore towing the vehicle, or when parking on 
a surface subject to movement, such as a 
ferry or auto train.The switch is located on the lower part of 
the center console.
1Indicator lamp
2Tow-away alarm deactivation switch
Switch off the ignition (
page 35).
Remove the SmartKey from the starter 
switch.
Press tow-away alarm deactivation 
switch2.
Indicator lamp1 in the tow-away 
alarm deactivation switch comes on 
briefly.
Exit your vehicle.
Lock your vehicle with the SmartKey.
The tow-away alarm remains disarmed un-
til you lock your vehicle again.
Canceling tow-away alarm
To cancel the alarm:
Press theŒ or‹button on the 
SmartKey.
or
Insert the SmartKey in the starter 
switch.
iWhen you unlock your vehicle, the 
tow-away protection disarms 
automatically. The tow-away alarm 
remains disarmed until you lock the 
vehicle again.
iYou cannot disarm the tow-away alarm 
while the ignition is switched on. 
     
        
        Page 97 of 464

97 Controls in detail
Locking and unlocking
Automatic central locking
The doors and the trunk automatically lock 
when the ignition is switched on and the 
wheels are turning at vehicle speeds of 
approximately 9 mph (15 km/h).
You can open a locked door from the in-
side. Open door only when conditions are 
safe to do so.
You can deactivate the automatic locking 
using the control system, see “Setting 
automatic locking” (
page 141).
Locking and unlocking from the inside
You can lock or unlock the doors and the 
trunk from inside using the central locking 
switch. This can be useful, for example, if 
you want to lock the vehicle before starting 
to drive.
The fuel filler flap will not be locked or un-
locked with the central locking or unlock-
ing switch, respectively.
iIf the vehicle has previously been cen-
trally locked from the outside with the 
SmartKey, opening the trunk from the 
inside will trigger the anti-theft alarm 
system.
To cancel the alarm, do one of the fol-
lowing:
Press buttonŒor‹ on the 
SmartKey.
Insert the SmartKey in the starter 
switch.
iThe doors unlock automatically after an 
accident if the force of the impact ex-
ceeds a preset threshold.
To prevent the vehicle door locks from 
locking, deactivate the automatic cen-
tral locking when the vehicle
is pushed or towed
is on a test stand
Warning!
G
When leaving the vehicle, always remove the 
SmartKey from the starter switch, take it 
with you, and lock the vehicle. Do not leave 
children unattended in the vehicle, or with 
access to an unlocked vehicle. Unsuper-
vised use of vehicle equipment may cause 
an accident and/or serious personal injury. 
     
        
        Page 100 of 464

100 Controls in detailSeats
When entering the vehicle, with the 
easy-entry/exit feature activated, the 
steering wheel or, depending on your se-
lection, the steering wheel and driver’s 
seat will return to their last set position or 
a factory-set maximum forward position 
when you
close the driver’s door with the ignition 
switched on.
insert the SmartKey into the starter 
switch with the driver’s door closed.
iIf the current position for the steering 
wheel is in the uppermost tilt position, 
the steering wheel will no longer be 
able to move upward when the 
easy-entry/exit feature is activated.
If the current seat position falls into a 
factory-set position range and the sys-
tem recognizes the current seat posi-
tion to be rearward enough for easy 
entry and exit, the driver’s seat will not 
move to the rear when the 
easy-entry/exit feature is activated.
iFor safety reasons, the driver’s seat will 
not return to its last set position with 
the easy-entry/exit feature activated if 
the system recognizes the last set posi-
tion as an extreme forward position. 
Instead, the driver’s seat will remain at 
or move to a factory-set maximum 
forward position. To again fully return 
the driver’s seat to your last set or to a 
memory position, adjust the driver’s 
seat to the desired position or press 
and hold the respective memory posi-
tion switch* (
page 104). 
     
        
        Page 101 of 464

101 Controls in detailSeats
Seat heating*
The switches are located on the upper part 
of the center console.
1Seat heating switch (driver’s side)
2Indicator lampsThe red indicator lamps2 on the seat 
heating switch show the heating level se-
lected:
Switch on the ignition (
page 35).Switching on seat heating
Press the desired seat heating switch.
Three red indicator lamps2 on the re-
spective seat heating switch come on.
Press the seat heating switch repeat-
edly until the desired seat heating level 
is reached.
Switching off seat heating
Press the desired seat heating switch 
repeatedly until all indicator lamps2 
on the seat heating switch go out.
Level3
Three indicator lamps on.
After approximately five minutes, 
seat heating is automatically 
switched to level 2.
2
Two indicator lamps on.
After approximately ten minutes, 
seat heating is automatically 
switched to level 1.
1
One indicator lamp on.
After approximately 20 minutes, 
seat heating is automatically 
switched to off.
off
No indicator lamp on.
iIf one or all of the indicator lamps2 
on the seat heating switch are flashing, 
there is insufficient voltage due to too 
many electrical consumers being 
turned on. The seat heating switches 
off automatically.
The seat heating will switch back on 
again automatically as soon as suffi-
cient voltage is available. 
     
        
        Page 102 of 464

102 Controls in detailSeatsAIRSCARF neck-level heating*
The AIRSCARF neck-level heating provides 
the area surrounding the occupants’ necks 
with a heated air stream flowing from 
openings in the head restraints.
The switches are located on the upper part 
of the center console.
1AIRSCARF switch (driver’s side)
2Indicator lampsThe red indicator lamps2 on the 
AIRSCARF switches show which heating 
level you have selected:
Switch on the ignition (
page 35).Switching on
Press the respective AIRSCARF switch 
for the desired side.
All three indicator lamps on the respec-
tive AIRSCARF switch come on. After a 
preheating time of approximately 
seven seconds, the blower starts.
Press the respective AIRSCARF switch 
repeatedly until the desired AIRSCARF 
heating level for the corresponding 
seat is reached.
Switching off
Press the respective AIRSCARF switch 
repeatedly until all indicator lamps on 
the AIRSCARF switch go out.
Warning!
G
When switching on the AIRSCARF neck-level 
heating, the air streaming from the openings 
may be very hot. When in close proximity to 
the openings, you could be seriously 
burned. To avoid serious personal injuries, 
switch the AIRSCARF to a lower heating 
level.Level3
Three indicator lamps on 
(highest heating level)
2
Two indicator lamps on
1
One indicator lamp on 
(lowest heating level)
off
No indicator lamp on
iAfter switching off the AIRSCARF 
neck-level heating, the AIRSCARF fan 
continues to operate for approximately 
10 seconds to cool down the heater 
elements. 
     
        
        Page 104 of 464

104 Controls in detailMemory function*The memory button and memory position 
switch are located on the outer side of 
each seat.
1Memory buttonM
2Memory position switch
Switch on the ignition (
page 35).
or
Open the respective door.
Storing positions into memory
Adjust the seat, on the driver’s side 
also the steering wheel and exterior 
rear view mirrors, to the desired posi-
tions (
page 37).
Press memory buttonM1.
Release memory buttonM1 and 
press a memory position switch2 
within three seconds.
All settings are stored to the selected 
position.
Recalling positions from memory
Press and hold desired memory posi-
tion switch2 until the seat, on the 
driver’s side also the steering wheel 
and exterior rear view mirrors, have 
completely moved to the stored posi-
tions.!Do not operate the power seats using 
the memory position switches if the 
seat backrest is in an excessively re-
clined position. Doing so could cause 
damage to the seats.iReleasing the memory position switch-
es immediately stops movement to the 
stored positions. 
     
        
        Page 105 of 464

105 Controls in detail
Memory function*
Storing exterior rear view mirror parking position (parking aid)
For easier parking, you can adjust the 
passenger-side exterior rear view mirror so 
that you can see the right rear wheel as 
soon as you engage reverse gearR.
You can switch the parking position fea-
ture on and off via the control system 
(page 144).
For information on activating the parking 
position feature, see “Activating exterior 
rear view mirror parking position (parking 
aid)” (
page 169).The switches are located on the lower part 
of the center console.
1Driver’s side exterior rear view mirror 
switch
2Adjustment switch
3Passenger-side exterior rear view mir-
ror switch
Switch on the ignition (
page 35).
Press switch3 to select the passen-
ger-side exterior rear view mirror.
Adjust the passenger-side exterior rear 
view mirror with adjustment switch2 
so that you see the rear wheel and the 
road curb.
Press memory buttonM (
page 104).
Within three seconds, press adjust-
ment switch2 forward, backward, 
left, or right.
The parking position is stored if the 
mirror does not move.
iYou can store one parking position for 
the passenger-side exterior rear view 
mirror for each SmartKey.
iIf the mirror does move, repeat the 
above steps. After the setting is stored, 
you can move the mirror again.