Page 87 of 399

87 Controls in detail
Locking and unlocking
Factory setting
Global unlocking
Press buttonŒ.
All turn signal lamps blink once. The
locking knobs in the doors move up.
The vehicle will lock again automatically
within approximately 40 seconds of un-
locking if neither door nor trunk is opened,
the SmartKey is not inserted in the starter
switch, or the central locking switch is not
activated.
Global locking
Press button‹.
All turn signal lamps blink three times.
The locking knobs in the doors move
down.Selective setting
If you frequently travel alone, you may wish
to reprogram the key so that
pressingŒ only unlocks the driver’s
door and the fuel filler flap.
Press and hold buttonsŒ and‹
simultaneously for about five seconds
until battery check lamp5 blinks twice.
The key will then function as follows:
Unlocking driver’s door and fuel filler
flap
Press buttonŒ once.
Global unlocking
Press buttonŒ twice.
Global locking
Press button‹.Restoring to factory setting
Press and hold buttonsŒ and‹
simultaneously for about six seconds
until battery check lamp5 blinks twice.Warning!
G
When leaving the vehicle always remove the
key from the starter switch, take the Smart-
Key with KEYLESS-GO (if so equipped) with
you and lock the vehicle. Do not leave chil-
dren unattended in the vehicle, or with ac-
cess to an unlocked vehicle. It is possible for
children to open a looked door from the in-
side, which could result in an accident or se-
rious injury.
Page 88 of 399

88 Controls in detailLocking and unlocking
Checking the batteries
Press button‹ orŒ.
Battery check lamp5 lights up briefly
to indicate that the key batteries are in
order.Unlocking the trunk lid
You can unlock the trunk separately.
A minimum height clearance of 5.75 ft.
(1.75 m) is required to open the trunk lid.
Press and hold button Š until trunk
opens.
The trunk can also be opened from its in-
side in an emergency, see "Trunk lid emer-
gency release" (
page 97).
!If you can no longer lock or unlock the
vehicle with the key, then either the
batteries in the SmartKey are dis-
charged or the key is malfunctioning.
Check the batteries in the key
(page 88) and replace them if
necessary (
page 328).
or
Use the mechanical key to lock and
unlock the doors (
page 327) and
the trunk lid (
page 98) as re-
quired.
If the key is malfunctioning, contact an
authorized Mercedes-Benz Center.
!If battery check lamp5 does not light
up briefly during check, then the key
batteries are discharged.
Replace the batteries (
page 329).
You can obtain the required batteries
at any authorized Mercedes-Benz Cen-
ter.
!The trunk lid swings upwards automat-
ically. Always make sure that there is
sufficient overhead clearance.
Page 92 of 399

92 Controls in detailLocking and unlockingUnlocking the trunk lid
The handle is located in the rear license
plate recess.
Pull on the handle and lift up the trunk
lid.
The vehicle unlocks the trunk lid only.
If the vehicle was previously separately
locked or locked with the SmartKey, the
trunk lid will remain locked.The trunk can also be opened from the in-
side in an emergency, see "Trunk lid emer-
gency release" (
page 97).Locking the vehicle
1Lock button at trunk
Press the lock button at door
(page 53) or trunk.
Closing the side windows and slid-
ing/pop-up roof*
Press and hold lock button at door
(page 53) or trunk until the side win-
dows and the sliding/pop-up roof are
closed.
!The trunk lid swings open upwards au-
tomatically. Always make sure that
there is sufficient overhead clearance.
iIf the vehicle was previously centrally
locked with the SmartKey, the trunk lid
will lock automatically after closing it.
The turn signals will flash three times to
confirm locking.
If you have left the SmartKey with KEY-
LESS-GO in the trunk, the trunk lid will
not close.
Page 93 of 399

93 Controls in detail
Locking and unlocking
Loss of the SmartKey with KEYLESS-GO
If you lose your SmartKey with KEY-
LESS-GO, you should do the following:
Have the SmartKey with KEYLESS-GO
deactivated by an authorized Mer-
cedes-Benz Center.
Report the loss immediately to your car
insurance company.
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.
Warning!
G
When closing the windows and the slid-
ing/pop-up roof, be sure that there is no
danger of anyone being harmed by the clos-
ing procedure.
If potential danger exists, proceed as fol-
lows:
Release the lock button.
Pull on the door handle or trunk lid han-
dle and hold firmly. The side windows
and the sliding/pop-up roof will open.
Page 99 of 399

99 Controls in detail
Locking and unlocking
Separately unlocking the trunk
Pull the mechanical key out of the
SmartKey (
page 329).
Insert the mechanical key in the trunk
lid lock.
Turn the key completely to the left to
position1, see above.
You can now open the trunk (
page 96).
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 ap-
proximately 9 mph (15 km/h) or more.
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
mode over the control system
(
page 142).
iUnlocking the trunk with the mechani-
cal key will trigger the anti-theft alarm
system. To cancel the alarm, do one of
the following:
Press button Œor ‹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.
The vehicle automatically locks 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 103 of 399

103 Controls in detailSeats
Head restraints
Information on head restraint adjustment
can be found in the "Getting started" sec-
tion (
page 36).Front seat head restraints
Removing front head restraints
Press switch1 upwards and hold until
the head restraint is fully extended.
Pull out head restraint.
Installing front head restraints:
Press switch1 upwards and hold for
about five seconds.
Push the head restraint down until it
engages.
Adjust head restraint to desired posi-
tion (
page 36).Rear seat head restraints
Warning!
G
For your protection, drive only with properly
positioned head restraints.
Adjust head restraint to support the back of
the head approximately at ear level.
Do not drive the vehicle without the seat
head restraints. Head restraints are intend-
ed to help reduce injuries during an acci-
dent.iTilt the backrest to the rear for easier
removal and installation of the head re-
straints.
Warning!
G
For safety reasons, always drive with the
rear head restraints in the upright position
when the rear seats are occupied.
Keep the area around head restraints clear
of articles (e.g. clothing) to not obstruct the
folding operation of the head restraints.
Page 110 of 399

110 Controls in detailMemory functionThe memory button is located on the door.
MMemory button
1,2,3Stored positions
Be sure that the ignition is switched on
or the relevant door is open and the
SmartKey is inserted in the starter
switch.
Storing positions into memory
Adjust the seats, steering wheel and
rear view mirrors to the desired posi-
tion (
page 34).
Press memory buttonM.
Release memory button and press
stored position button 1, 2 or 3 within
three seconds.
All the settings are stored at the select-
ed position.
Recalling positions from memory
On memory button, press and hold
stored position button1, 2 or3 until
the seat, steering wheel and rear view
mirrors have fully moved to the stored
positions.iReleasing the button immediately
stops movement to the stored posi-
tions.Warning!
G
Do not operate the power seats using the
memory button if the backrest is in an ex-
cessively reclined position. Doing so could
cause damage to front or rear seats.
First move backrest to an upright position.
Page 119 of 399

119 Controls in detail
Instrument cluster
Coolant temperature displayDuring severe operating conditions and
stop-and-go city traffic, the coolant tem-
perature may rise close to 248°F (120°C).
The engine should not be operated with
the coolant temperature above 248°F
(120°C). Doing so may cause serious en-
gine damage which is not covered by the
Mercedes-Benz Limited Warranty.
Trip odometer
Check to see that the trip odometer
and main odometer (
page 121) ap-
pear in the multifunction display.
Press and hold the reset knob on the in-
strument cluster (
page 22) until the
trip odometer is reset.
Warning!
G
Driving when your engine is badly over-
heated can cause some fluids which
may have leaked into the engine com-
partment to catch fire. You could be se-
riously burned.
Steam from an overheated engine can
cause serious burns and can occur just
by opening the engine hood. Stay away
f r o m t h e e n g i n e i f y o u s e e o r h e a r s t e a m
coming from it.
Turn off the engine, get out of the vehicle
and do not stand near the vehicle until it
cools down.iExcessive coolant temperatures trigger
a warning in the multifunction display.