Page 103 of 474

101 Controls in detail
Locking and unlocking
Important notes on using KEYLESS-GO
You can also use the SmartKey with 
KEYLESS-GO like a normal SmartKey 
(page 94).
You can combine KEYLESS-GO func-
tions with normal SmartKey functions 
(e.g. unlocking with KEYLESS-GO and 
locking with the Œ button).
Always carry the SmartKey with 
KEYLESS-GO with you.
Never store the SmartKey with 
KEYLESS-GO together with:
Electronic items such as a cellular 
phone or another SmartKey with 
KEYLESS-GO
Metallic objects such as coins or 
metal foil
Doing so could impair the function of 
the KEYLESS-GO system.
To lock or unlock the vehicle, the 
SmartKey with KEYLESS-GO must be 
located outside the vehicle within ap-
proximately 3 ft (1 m) of a door or the 
trunk.
In order to start the engine with the 
SmartKey with KEYLESS-GO:
The SmartKey with KEYLESS-GO 
must be located in the vehicle.
All doors must be closed.
The brake pedal must be firmly de-
pressed. Do not depress the accel-
erator.
If you have started the engine with the 
KEYLESS-GO start/stop button 
(page 37), you can only turn it off 
again with this button, even if you have 
put the SmartKey in the starter switch 
in the meantime.
This does not apply if, after starting, the 
selector lever is still in positionP and 
the SmartKey is then inserted in the 
starter switch. The SmartKey will then 
have priority over the KEYLESS-GO 
function and the vehicle’s electrical 
system will operate according to the 
position of the SmartKey in the starter 
switch, even stopping the engine.
If the SmartKey with KEYLESS-GO is 
positioned farther away from the vehi-
cle, the system may no longer recog-
nize the SmartKey with KEYLESS-GO. 
The vehicle then cannot be locked or 
the engine started via the KEYLESS-GO 
system. 
     
        
        Page 104 of 474

102 Controls in detailLocking and unlocking
If the SmartKey with KEYLESS-GO is re-
moved from the vehicle while the en-
gine is running (e.g. if passenger exits 
the vehicle with the SmartKey with 
KEYLESS-GO), the message 
Key not 
recognized!
 will appear in the multi-
function display while driving off.
Find the SmartKey or change its 
present location immediately (e.g. 
place it on the front passenger seat or 
insert it in shirt pocket).
Remember that the engine can be 
started by anyone with a SmartKey 
wi th KEY LES S-GO tha t i s le ft  ins id e t he  
vehicle. If you leave the SmartKey with 
KEYLESS-GO behind when exiting and 
locking the vehicle, the message 
Key 
recognized in vehicle!
 will appear in 
the multifunction display.Factory setting
Global unlocking
Grasp the door handle.
All turn signals flash once. The locking 
knobs in the doors move up. The 
anti-theft alarm system is disarmed.
The vehicle will lock again automatically 
within approximately 40 seconds of un-
locking if neither door nor trunk is opened. Global locking
Press lock button at door handle 
(page 60) or trunk (
page 104).
All turn signals flash three times. The 
locking knobs in the doors move down. 
The anti-theft alarm system is armed.
iIf the vehicle has been parked for more 
than 72 hours, you must pull the out-
side door handle in order to activate 
the KEYLESS-GO function.
iThe vehicle could inadvertently unlock 
if the SmartKey with KEYLESS-GO is 
within 3 ft (1 m) of the vehicle and 
the door handle is splashed with 
water 
or
you attempt to clean the door 
handle 
     
        
        Page 108 of 474

106 Controls in detailLocking and unlockingLoss of SmartKey with KEYLESS-GO
If you lose your SmartKey with 
KEYLESS-GO, you should do the following:
Have the SmartKey with KEYLESS-GO 
deactivated by an authorized 
Mercedes-Benz Center.
Report the loss of the SmartKey with 
KEYLESS-GO or the mechanical key to 
your car insurance company immedi-
ately.
Have the mechanical lock replaced if 
necessary.
Your authorized Mercedes-Benz Center 
will be glad to supply you with a replace-
ment. 
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.
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 button Œ or ‹on the 
SmartKey. 
With KEYLESS-GO*
Press the KEYLESS-GO* start/stop 
button (
page 49).
Grasp the outside door handle 
     
        
        Page 112 of 474

110 Controls in detailLocking and unlockingIllumination of the emergency release but-
ton:
The button flashes for 30 minutes after 
opening the trunk.
The button flashes for 60 minutes after 
closing the trunk.
Automatic central locking
The doors and the trunk lid lock automati-
cally when the vehicle is set into motion.
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 (
page 156).
iThe emergency release button unlocks 
the trunk while the vehicle is standing 
still or in motion.iThe emergency release button does 
not open the trunk lid if the vehicle bat-
tery is discharged or disconnected.
iIf the emergency release button is 
pressed and the vehicle was centrally 
locked, the exterior lamps will flash and 
the alarm will sound as the trunk lid 
opens.
To cancel the alarm, do one of the fol-
lowing:
With the SmartKey
Insert the SmartKey in the starter 
switch.
Press buttonŒ or‹ on the 
SmartKey.
With KEYLESS-GO*
Grasp the outside door handle.
Press the KEYLESS-GO* start/stop 
button.
iThe doors unlock automatically after an 
accident if the force of the impact ex-
ceeds a preset threshold.
The vehicle locks automatically when 
the ignition is switched on and the 
wheels are turning at vehicle speeds of 
approximately 9 mph (15 km/h) or 
more. You could therefore lock yourself 
out when the vehicle 
is pushed
is on a test stand
 
     
        
        Page 113 of 474

111 Controls in detail
Locking and unlocking
Locking and unlocking from the inside
You can lock or unlock the vehicle from in-
side using the central locking switches. 
This can be useful, for example, if you want 
to unlock the passenger door from the in-
side or want to lock the vehicle before 
starting to drive.
The central locking switch does not lock or 
unlock the fuel filler flap.The switches are located above and be-
tween the center air vents of the air condi-
tioning.
Central locking switches1Locking
2UnlockingLocking
Press central locking switch1.
If all the doors are closed, the vehicle 
locks.
Unlocking
Press central locking switch2.
The vehicle unlocks.
Warning!
G
When leaving the vehicle, always remove the 
SmartKey or the SmartKey with 
KEYLESS-GO* 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. Unsu-
pervised use of vehicle equipment may 
cause an accident and/or serious personal 
injury.
Warning!
G
You can open a locked door from inside at 
any time. Open door only when conditions 
are safe to do so. 
     
        
        Page 115 of 474

113 Controls in detailSeats
Seats
For more information on seat adjustment, 
see “Seat adjustment” (
page 40).
Easy-entry / exit feature
This feature allows for easier entry into and 
exit from the vehicle.
The easy-entry/exit feature can be activat-
ed or deactivated in the 
Convenience
 sub-
menu of the 
SETTINGS
 menu of the control 
system (
page 157).When exiting the vehicle, with the 
easy-entry/exit feature activated and 
depending on your selection, the steering 
wheel tilts upwards and/or the driver’s 
seat moves a few inches to the rear when 
you
remove the SmartKey from the starter 
switch
or
open the driver’s door with the 
SmartKey in starter switch position 0 
or 1 or the KEYLESS-GO* start/stop 
button in position 1 (
page 37)
Warning!
G
You must make sure no one can become 
trapped or injured by the moving steering 
wheel and driver’s seat when the easy-en-
try/exit feature is activated. 
To cancel seat/steering wheel movement, 
do one of the following:
Press seat adjustment switch 
(page 40).
Move steering column stalk 
(page 42).
Press the memory button (
page 120).
Do not leave children unattended in the ve-
hicle, or with access to an unlocked vehicle. 
Children could open the driver’s door and 
unintentionally activate the easy-entry/exit 
feature, which could result in an accident 
and/or serious personal injury. 
     
        
        Page 116 of 474

114 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 memory po-
sition 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 or press the KEYLESS-GO* start 
stop button once 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. In-
stead, the driver’s seat will remain at or 
move to a factory-set maximum for-
ward position. To again fully return the 
driver’s seat to your last set position or 
to memory position, adjust the seat to 
the desired position or press and hold 
the respective memory position button 
(page 120).  
     
        
        Page 126 of 474

124 Controls in detailLightingManual headlamp mode
The low beam headlamps and parking 
lamps can be switched on or off with the 
exterior lamp switch.Automatic headlamp mode
The following lamps switch on and off au-
tomatically depending on the brightness of 
the ambient light:
Low beam headlamps
Tail lamps
Parking lamps
License plate lamps
Side marker lamps
iWith the SmartKey removed from the 
starter switch or the engine turned off 
with KEYLESS-GO* and the driver’s 
door open, a warning sounds if the 
parking lamps or the low beam head-
lamps are switched on. 
The message $ 
Turn off lamps
 
appears in the multifunction display.
iWith the daytime running lamp mode 
activated (mandatory in Canada) and 
the engine running, the low beam head-
lamps cannot be switched off manual-
ly.
To activate the daytime running lamp 
mode, see “Setting daytime running 
lamp mode (USA only)” (
page 152).
Warning!
G
If the exterior lamp switch is set toU,
the headlamps may switch off unexpect-
edly when the system senses bright am-
bient light, for example light from 
oncoming traffic. 
the headlamps will not be automatically 
switched on under foggy conditions. 
To minimize risk to you and to others, acti-
vate headlamps by turning exterior lamp 
switch to B when driving or when traffic 
and / or ambient lighting conditions require 
you to do so.
In low ambient lighting conditions, only 
switch from position U to B with the 
vehicle at a standstill. Switching from U 
to B will briefly switch off the head-
lamps. Doing so while driving in low ambient 
lighting conditions may result in an acci-
dent.
The automatic headlamp feature is only an 
aid to the driver. The driver is responsible for 
the operation of the vehicle’s lights at all 
times.