Page 100 of 506

99 Controls in detail
Locking and unlocking
SmartKey with KEYLESS-GO1‹ Lock button
2Š Opening button for trunk lid
3Mechanical key locking tab
4Œ Unlock button
5Battery check lamp
6Â Panic button (
page 83)
For more information on using the
SmartKey buttons, see “SmartKey”
(
page 94). iWhen the passenger outside door han-
dle is pulled, the vehicle is centrally un-
locked.
Warning!
G
When leaving the vehicle, always take the
SmartKey with KEYLESS-GO* with you, and
lock the vehicle. Do not leave children unat-
tended in the vehicle, or with access to an
unlocked vehicle. Unsupervised use of vehi-
cle equipment may cause an accident
and/or serious personal injury.!To prevent possible malfunction, avoid
exposing the SmartKey with
KEYLESS-GO to high levels of electro-
magnetic radiation.
iUSA only:
This device 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 103 of 506

102 Controls in detailLocking and unlockingGlobal locking
Press lock button at door handle
(page 58) or trunk lid (
page 104).
With the hood, trunk and both doors
closed, all turn signal lamps flash three
times. The locking knobs in the doors
move down. The anti-theft alarm sys-
tem is armed.Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey with
KEYLESS-GO so when you, pull the driver’s
door handle only the driver’s door and the
fuel filler flap unlocks.
Press and hold buttonsŒ and‹
simultaneously for about five seconds
until battery check lamp5 flashes
twice.
The SmartKey with KEYLESS-GO will then
function as follows:
Unlocking driver’s door and fuel filler
flap
Pull the driver’s door handle.
All turn signal lamps flash once. The
locking knob in the driver’s door moves
up. The anti-theft alarm system is
disarmed.Global unlocking
Pull the door handle on the passenger
side.
All turn signal lamps flash once. The
locking knobs in the doors move up.
The anti-theft alarm system is
disarmed.
Global locking
Press lock button at door handle.
With the hood, trunk and both doors
closed, all turn signal lamps flash three
times. The locking knobs in the doors
move down. The anti-theft alarm sys-
tem is armed.
iThe vehicle could inadvertently be
unlocked 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.
iYou can also lock the vehicle using the
lock button at trunk lid (
page 104).
Page 104 of 506

103 Controls in detail
Locking and unlocking
Restoring to factory setting
Press and hold buttonsŒ and‹
simultaneously for about six seconds
until battery check lamp5 flashes
twice.Checking the batteries
Press button‹ orŒ.
Battery check lamp5 comes on
briefly to indicate that the SmartKey
batteries are in order.
!If you can no longer lock or unlock the
vehicle with the SmartKey with
KEYLESS-GO, then the batteries in the
SmartKey are discharged, the
SmartKey with KEYLESS-GO is mal-
functioning or the vehicle battery is
drained.
Check the batteries in the
SmartKey (
page 103) and
replace them if necessary
(
page 412).
Use the mechanical key to unlock
the driver’s door (
page 397) and
the trunk (
page 398).
Have the vehicle battery and the
battery connections checked
(page 427).
Use the mechanical key to lock the
driver’s door (
page 398).
If the SmartKey with KEYLESS-GO is
malfunctioning, contact an authorized
Mercedes-Benz Center.
iIf battery check lamp5 does not
come on briefly during check, then the
SmartKey batteries are discharged.
Replace the batteries (
page 412).
You can obtain the required batteries
at any authorized Mercedes-Benz
Center.
iIf the batteries are checked within sig-
nal range of the vehicle, pressing
the‹ orŒ button will lock or
unlock the vehicle accordingly.
Page 110 of 506

109 Controls in detail
Locking and unlocking
Trunk lid emergency release
The emergency release button is located
on the inside of the trunk lid.
1Emergency release button
Briefly press emergency release
button1.
The trunk lid unlocks and the trunk lid
opens.Illumination of the emergency release but-
ton:
The button will flash for 30 minutes
after opening the trunk.
The button will flash for 60 minutes
after closing the trunk.
!The trunk lid swings open upwards au-
tomatically.
iThe emergency release button unlocks
and opens the trunk while the vehicle is
standing still or in motion.iThe emergency release button does
not open the trunk lid if the vehicle
battery 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 following:
press buttonŒ or‹ on the
SmartKey.
insert the SmartKey in the starter
switch.
In vehicles with KEYLESS-GO*:
pull the outside door handle.
press the start/stop button.
Page 180 of 506

179 Controls in detail
Good visibility
Rear window defroster
The rear window defroster uses a large
amount of power. To keep the battery
drain to a minimum, switch off the
defroster as soon as the rear window is
clear. The defroster is automatically
deactivated after approximately
6 to 17 minutes of operation depending on
the outside temperature.Activating
Press buttonF or1 in the cli-
mate control panel (
page 181) or in
the automatic climate control panel
(
page 191).
The indicator lamp on the button
comes on.
Deactivating
Press buttonF or1 again.
The indicator lamp on the button goes
out.
Warning!
G
Any accumulation of snow and ice should be
removed from the rear window before
driving. Visibility could otherwise be
impaired, endangering you and others.!If the rear window defroster switches
off too soon and the indicator lamp
starts flashing, this means that too
many electrical consumers are
operating simultaneously and there is
insufficient voltage in the battery. The
system responds automatically by
deactivating the rear window defroster.
As soon as the battery has sufficient
voltage, the rear window defroster
automatically switches on again.
Page 200 of 506

199 Controls in detail
Automatic climate control (CLK 500/CLK 55 AMG)
Residual heat and ventilation*
(available on Automatic climate control panel design A only)
With the engine switched off, it is possible
to continue to heat or ventilate the interior
for up to 30 minutes. This feature makes
use of the residual heat produced by the
engine.
Activating
Switch off the ignition (
page 36).
Press button°(
page 191).
The indicator lamp on the button
comes on.Deactivating
Press button°(
page 191).
The indicator lamp on the button goes
out.
The residual heat is automatically turned
off:
when the ignition is switched on
after about 30 minutes
if the battery voltage drops
!If the air conditioning cannot be turned
on again, this indicates that the air
conditioning is losing refrigerant. The
compressor has turned itself off.
Have the air conditioning checked at
the nearest authorized Mercedes-Benz
Center.
iHow long the system will provide
heating depends on
the coolant temperature
the temperature set by the operator
The blower will run at speed setting 1
regardless of the air distribution
control setting.
Page 244 of 506

243 Controls in detail
Power windows
Opening (Summer opening feature)
Press and hold button Œ after
unlocking the vehicle.
The windows and soft top begin to
open after approximately one second.
Release the Œ button to stop
procedure.
Closing (Convenience feature)
Press and hold button ‹ after
locking the vehicle.
The windows and soft top begin to
close after approximately one second.
Release the ‹ button to stop
procedure.
Make sure all side windows and the
soft top are properly closed before leaving
the vehicle.Closing the side windows with
KEYLESS-GO*
Press and hold lock button at door
(page 58) until the side windows are
closed.
Synchronizing power windows
The power windows must be resynchro-
nized each time
after the battery has been
disconnected.
if the power windows cannot be fully
opened (Express-open) or closed
(Express-close).
Switch on the ignition (
page 36).
Pull the power window switches until
the side windows are closed.
Hold the switches for approximately
one second.
The power windows are synchronized.
Warning!
G
When closing the windows, make sure there
is no danger of anyone being harmed by the
closing procedure.
The windows will not automatically re-open
if blocked during convenience closing.
If potential danger exists, proceed as fol-
lows:
Release the lock button.
Pull on the door handle and hold firmly.
The side windows will open for about
two seconds if the door handle is held
but the door not opened.
Page 278 of 506

277 Controls in detail
Useful features
Tele Aid
The Tele Aid system
(Tele
matic A
larm I
dentification on
D
emand)
The Tele Aid system consists of three
types of response:
automatic and manual emergency
roadside assistance and
informationThe Tele Aid system is operational provid-
ing that the vehicle’s battery is charged,
properly connected, not damaged and
cellular and GPS coverage is available.
The speaker volume of a Tele Aid call can
be adjusted when using the volume control
on the multifunction steering wheel. To
raise, press buttonæ and to lower,
press buttonç. The volume can also be
adjusted using the volume knob on your
audio system or COMAND* head unit.
To activate, press the SOS button, the
Roadside Assistance button• or
the Information button¡, depend-
ing on the type of response required.Shortly after the completion of your
Tele Aid acquaintance call, you will receive
a user ID and password. By visiting
www.mbusa.com and selecting “Tele Aid”
(USA only), you will have access to account
information, remote door unlock and
more.
System self-check
Initially, after switching on the ignition,
malfunctions are detected and indicated
(the indicator lamps in the SOS button, the
Roadside Assistance button• and the
Information button¡ stay on longer
than ten seconds or do not come on). The
!The initial activation of the Tele Aid
system may only be performed by
completing the subscriber agreement
and placing an acquaintance call using
the¡ button. Failure to complete
either of these steps will result in a
system that is not activated.
If you have any questions regarding
activation, please call the Response
Center at 1-800-756-9018 (in the USA)
or 1-888-923-8367 (in Canada).
iThe SOS button is located above the
interior rear view mirror.
The Roadside Assistance button•
and the Information button¡ are
located below the center armrest
cover.
iThe Tele Aid system utilizes the cellular
network for communication and the
GPS (G
lobal P
ositioning S
ystem) satel-
lites for vehicle location. If either of
these signals is unavailable, the
Tele Aid system may not function and if
this occurs, assistance must be sum-
moned by other means.