Page 4 of 442

ContentsSafety and Security...........................  55
Occupant safety...................................  56
Airbags ...........................................  57
Seat belts .......................................  62
Children in the vehicle ....................  65
Blocking of rear door window 
operation ........................................  72
Panic alarm ..........................................  73
Activating .......................................  73
Deactivating ...................................  73
Driving safety systems .........................  74
ABS ................................................  74
BAS ................................................  76
ESP .................................................  76
The SBC brake system ...................  79
Four wheel electronic traction 
system (4MATIC) with the ESP .......  82
Anti-theft systems................................  83
Immobilizer.....................................  83
Anti-theft alarm system ..................  84
Tow-away alarm .............................  85
Controls in detail...............................  87
Locking and unlocking .........................  88
SmartKey .......................................  88
SmartKey with KEYLESS-GO* ........  91
Opening the doors from the inside .  97
Opening the trunk ..........................  97
Closing the trunk............................  99
Trunk lid opening / closing 
system* .........................................  99
Trunk lid emergency release ........  104
Separately locking the trunk ........  105
Separately unlocking the trunk ....  106
Automatic central locking ............  106
Locking and unlocking from 
the inside .....................................  107
Seats .................................................  108
Easy-entry / exit feature* .............  108
Removing and installing front 
seat head restraints .....................  109
Rear seat head restraints .............  110
Multicontour seat* .......................  111
Drive - Dynamic seat* ...................  112
Heated seats* ..............................  113
Seat ventilation* ..........................  114Memory function ...............................  116
Storing positions in memory ........  117
Recalling positions from 
memory........................................  117
Storing exterior rear view 
mirror parking position ................  118
Lighting .............................................  119
Exterior lamp switch ....................  119
Combination switch .....................  123
Hazard warning flasher ................  123
Interior lighting ............................  124
Door entry lamps .........................  125
Trunk lamp ...................................  125
Instrument cluster .............................  126
Instrument cluster illumination ....  126
Coolant temperature gauge .........  127
Trip odometer ..............................  127
Tachometer ..................................  128
Outside temperature indicator .....  128 
     
        
        Page 27 of 442
27 At a glance
Overhead control panel
Overhead control panel
Item
Page
1
Rear interior lighting 
on/off
125
2
Automatic interior lighting
124
3
Front interior lighting 
on/off
124
4
Temperature sensor 
5
Right reading lamp on/off
124
6
Sliding/pop-up roof* or 
panorama sliding/pop-up 
roof*
201,
205
Item
Page
7
Tele Aid (emergency call 
system) button
250
8
Rear view mirror
168
9
Reading lamps
124
a
Garage door opener
258
b
Tow-away alarm button
85
c
Ambient lighting
147
d
Interior lighting
e
Left reading lamp on/off
125 
     
        
        Page 55 of 442
55 Safety and Security
Occupant safety
Panic alarm
Driving safety systems
Anti-theft systems 
     
        
        Page 73 of 442
73 Safety and Security
Panic alarm
Panic alarm
An audible alarm and flashing exterior 
lamps will operate for approximately 
2½ minutes.
1Â button
Activating
Press and hold button1 for at least 
1 second. 
Deactivating
Press button1 again.
or
Insert SmartKey in starter switch.
iFor operation in the USA only: This de-
vice complies with Part 15 of the 
FCC Rules. Operation is subject to the 
following two conditions:
(1) This device may not cause harmful 
interference, and
(2) this device must accept any inter-
ference received, including interfer-
ence that may cause undesired 
operation.
Any unauthorized modification to this 
device could void the user’s authority 
to operate the equipment. 
     
        
        Page 84 of 442

84 Safety and SecurityAnti-theft systemsAnti-theft alarm system
Once the alarm system has been armed, a 
visual and audible alarm is triggered when 
someone opens
a door
the trunk
the hood.
The alarm will stay on, even if the activat-
ing element (a door, for example) is imme-
diately closed.
The alarm system will also be triggered 
when
someone attempts to raise the vehicle.Arming the alarm system
The alarm system is armed within approxi-
mately ten seconds after locking the vehi-
cle with the SmartKey or KEYLESS-GO*. 
The turn signal lamps flash three times to 
indicate that the alarm system is activated. 
The indicator lamp in the central locking 
switch (
page 25) begins to flash after 
arming the alarm system.Disarming the alarm system
The alarm system is disarmed when you 
unlock your vehicle with the SmartKey or 
KEYLESS-GO*. The turn signal lamps flash 
once to indicate that the alarm system is 
deactivated.
iIf the alarm stays on for more than 
20 seconds, an emergency call is initi-
ated automatically by the Tele Aid sys-
tem* (
page 250) provided Tele Aid 
service was subscribed to and properly 
activated, and that necessary cellular 
service and GPS coverage are avail-
able.
iIf the turn signal lamps do not flash 
three times one of the following ele-
ments may not be properly closed:
a door
the trunk lid
Close the respective element and lock 
the vehicle again. 
     
        
        Page 85 of 442

85 Safety and Security
Anti-theft systems
Canceling the alarm
With the SmartKey
Insert the SmartKey in the starter 
switch.
or
Press the Œ or ‹ button on the 
SmartKey.
The alarm is canceled.
With KEYLESS-GO*
Grasp the outside door handle.
or
Press the KEYLESS-GO* start/stop 
button.
The alarm is canceled.
Tow-away alarm
Once the tow-away alarm is armed, a visual 
and audible alarm will be triggered when 
someone attempts to raise the vehicle.Arming the tow-away alarm
When you lock your vehicle, the tow-away 
alarm is automatically armed after about 
30 seconds.
When you unlock your vehicle, the 
tow-away protection disarms automatical-
ly.
Disarming the tow-away alarm
To prevent triggering the tow-away alarm 
feature, switch off the tow-away alarm be-
fore towing the vehicle, or when parking on 
a surface subject to movement, such as a 
ferry or auto train.
The button is located on the overhead con-
trol panel.
iThe tow-away protection alarm is trig-
gered, for example, if the vehicle is lift-
ed on one side.
If the alarm stays on for more than 
20 seconds, an emergency call is initi-
ated automatically by the Tele Aid sys-
tem* (
page 250), provided that the 
Tele Aid service was subscribed to and 
properly activated, and that necessary 
cellular service and GPS coverage are 
available.  
     
        
        Page 86 of 442
86 Safety and SecurityAnti-theft systems1Tow-away alarm off button
Switch off the ignition and remove the 
SmartKey.
Press button1.
The indicator lamp in the button comes 
on briefly.
Exit and lock your vehicle with the 
SmartKey or (vehicles with KEY-
LESS-GO*) the lock button at each 
door handle.
The tow-away alarm remains disarmed un-
til you lock your vehicle again.Canceling tow-away alarm
To cancel the alarm:
With the SmartKey
Insert the SmartKey in the starter 
switch.
or
Press the Œ or ‹ button on the 
SmartKey.
With KEYLESS-GO*
Grasp the outside door handle.
or
Press the KEYLESS-GO start/stop but-
ton.
iYou cannot disarm the tow-away alarm 
when the ignition is switched on. 
     
        
        Page 97 of 442
97 Controls in detail
Locking and unlocking
Opening the doors from the inside
You can open a locked door from the in-
side. Open door only when conditions are 
safe to do so.
1Locking knob
2Inside door handle
Pull on door handle2.
If door was locked, locking knob1 will 
move up.
Opening the trunk
Opening the trunk from the outside
A minimum height clearance of 5.90 ft 
(1.80 m) is required to open the trunk lid.
The handle is located above the rear li-
cense plate recess.
Pull on the handle.
The trunk opens.
iIf the vehicle has previously been 
locked from the outside with the 
SmartKey, opening a door from the in-
side will trigger the anti-theft alarm sys-
tem.
To cancel the alarm, do one of the fol-
lowing:
With the SmartKey
Insert the SmartKey in the starter 
switch.
Press the Œ or ‹ button on 
the SmartKey.
With KEYLESS-GO*
Grasp the outside door handle.
Press the KEYLESS-GO* start/stop 
button.