Page 24 of 514
23 At a glance
Cockpit
Item
Page
1
Steering wheel gearshift
buttons
CLK 500
CLK 55 AMG
175
176
2
Combination switch
Turn signals
Windshield wipers
High beam
53
53
52
3
Cruise control lever
265
4
Multifunction steering
wheel
26,
140
5
Instrument cluster
24,
136
6
Lever for voice control
system*, see separate
operating instructions
7
Starter switch
34
8
Front Parktronic* warning
indicator (Canada only)
269
Item
Page
9
Overhead control panel
29
a
Glove box
278
b
Cup holder
283
c
Center console
27, 28
d
Hood lock release
321
e
Horn
f
Steering wheel adjustment
stalk
41
g
Parking brake pedal
50
h
Door control panel
30
j
Parking brake release
50
k
Exterior lamp switch
52,
127
l
Exterior rear view mirror ad-
justment
43
m
Headlamp washer switch*
181
Page 27 of 514
26 At a glanceMultifunction steering wheel
Item
Page
1
Multifunction display
140
Operating control system
140
2
Selecting the submenu or
setting the volume:
Press buttonæup / to increaseçdown / to decrease
3
Telephone*:
Press buttonsto take a call
to dial a call
164
164
tto end a call
to reject an incoming
call
164
Item
Page
4
Menu systems:
Press buttonèfor next menuÿfor previous menu
5
Moving within a menu:
Press buttonjfor next displaykfor previous display
Page 34 of 514

33 Getting started
Unlocking
Unlocking with KEYLESS-GO*
With the KEYLESS-GO function, you can
lock and unlock the vehicle without using
the remote control buttons on the
SmartKey and start the engine without in-
serting the SmartKey in the starter switch.
Pull an outside door handle.
All turn signal lamps flash once. The
vehicle unlocks. The locking knobs in
the doors move up. The anti-theft alarm
system is disarmed.
Enter the vehicle.For more information, see “SmartKey with
KEYLESS-GO*” (
page 100).
iTo unlock the vehicle, the SmartKey
with KEYLESS-GO must be outside the
vehicle, no further than approx. 3 feet
(1 meter) away from the door.
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.
iOpening a door causes the windows on
that side of the car to open slightly.
They will return to the up position when
the door is closed.
Page 45 of 514

44 Getting startedAdjustingThe buttons are located above the exterior
lamp switch.
1Adjustment button
2Passenger-side exterior rear view
mirror button
3Driver’s side exterior rear view mirror
button
Switch on the ignition (
page 34).
Press button3 for the driver’s side
exterior rear view mirror or button2
for the passenger-side exterior rear
view mirror.
Push adjustment button1 up, down,
left, or right, according to the desired
setting.
For more information, see “Rear view mir-
rors” (
page 181).
!If an exterior rear view mirror was
forcibly pushed forward (hit from the
rear) or forcibly pushed rearward (hit
from the front), reposition it by
applying firm pressure until it snaps
into place. The mirror housing is now
properly positioned and you can adjust
the mirror normally.
iThe memory function (
page 124) lets
you store the setting for the exterior
rear view mirrors together with the set-
tings for the steering wheel and seat
position.
iAt low ambient temperatures, the
exterior rear view mirrors will be
heated automatically.
Page 99 of 514

98 Controls in detailLocking and unlockingFactory setting
Global unlocking
Press buttonŒ.
All turn signal lamps flash once. The
locking knobs in the doors move up.
The anti-theft alarm system is
disarmed.
The vehicle will lock again automatically
and rearm the anti-theft alarm system
within approximately 40 seconds of
unlocking if:
neither a door nor the trunk is opened
the SmartKey is not inserted in the
starter switch
the central locking switch is not
activatedGlobal locking
Press button‹.
With the trunk and both doors closed,
all turn signal lamps flash three times.
The locking knobs in the doors move
down. The anti-theft alarm system is
armed.
Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey so that
pressingŒ only unlocks the driver’s
door and the fuel filler flap.
Press and hold buttonsŒ and‹
simultaneously for about 5 seconds un-
til battery check lamp5 flashes twice.
The SmartKey will then function as follows:Unlocking driver’s door and fuel filler
flap
Press buttonŒ once.
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
Press buttonŒ twice.
All turn signal lamps flash once. The
locking knobs in the doors move up.
The anti-theft alarm system is
disarmed.
Global locking
Press button‹.
With the trunk and both doors closed,
all turn signal lamps flash three times.
The locking knobs in the doors move
down. The anti-theft alarm system is
armed.
Page 100 of 514

99 Controls in detail
Locking and unlocking
Restoring to factory setting
Press and hold buttonsŒ and‹
simultaneously for about 6 seconds un-
til 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.Unlocking and opening the trunk
You can unlock and open the trunk
separately.
A minimum height clearance of 5.41 ft
(1.65 m) is required to open the trunk lid.
Press and hold button Š until trunk
unlocks and begins to open.
The trunk can also be opened from its in-
side in an emergency, see “Trunk emer-
gency release” (
page 115).
!If you can no longer lock or unlock the
vehicle with the SmartKey, then the
batteries in the SmartKey are dis-
charged, the SmartKey is malfunction-
ing or the vehicle battery is drained.
Check the batteries in the
SmartKey (
page 99) and replace
them if necessary (
page 435).
Use the mechanical key to unlock
the driver’s door (
page 419) and
the trunk (
page 420).
Use the mechanical key to lock the
driver’s door (
page 420) and the
trunk (
page 116).
Have the vehicle battery and the
battery connections checked
(page 453).
If the SmartKey is malfunctioning,
contact an authorized Mercedes-Benz
Center.!If battery check lamp5 does not
come on briefly during check, then the
SmartKey batteries are discharged.
Replace the batteries (
page 435).
You can obtain the required batteries
at any authorized Mercedes-Benz
Center.
iIf the batteries are checked within
signal range of the vehicle, pressing
the‹orŒ button will lock or
unlock the vehicle accordingly.
!The trunk lid swings open upwards au-
tomatically. Always make sure there is
sufficient overhead clearance.
Vehicles with trunk opening/closing
system*: To stop the opening proce-
dure, press button Š. The trunk lid
stops moving.iIf the trunk does not open, it is still
locked separately (
page 116).
Page 105 of 514

104 Controls in detailLocking and unlockingGlobal locking
Press the lock button on an outside
door handle (
page 60) or the trunk
lid (
page 106).
With the trunk and both doors closed,
all turn signal lamps flash three times.
The locking knobs in the doors move
down. The anti-theft alarm system 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 5 seconds un-
til 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 outside 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 outside door handle on the pas-
senger 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 the lock button on an outside
door handle.
With the trunk and both doors closed,
all turn signal lamps flash three times.
The locking knobs in the doors move
down. The anti-theft alarm system is
armed.iYou can also lock the vehicle using the
lock button on the trunk lid,
(page 106) or, vehicles with trunk
opening/closing*, KEYLESS-GO lock-
ing/closing switch (
page 114).
Page 106 of 514

105 Controls in detail
Locking and unlocking
Restoring to factory setting
Press and hold buttonsŒ and‹
simultaneously for about 6 seconds un-
til battery check lamp5 flashes twice.
Checking the batteries
Press button‹orŒ.
Battery check lamp5 comes on
briefly to indicate that the SmartKey
with KEYLESS-GO batteries are in or-
der.Global locking using the lock button on
the trunk lid
!If you can no longer lock or unlock the
vehicle with the SmartKey with
KEYLESS-GO, then the batteries in the
SmartKey with KEYLESS-GO are dis-
charged, the SmartKey with
KEYLESS-GO is malfunctioning or the
vehicle battery is drained.
Check the batteries in the
SmartKey with KEYLESS-GO
(page 105) and replace them if
necessary (
page 435).
Use the mechanical key to unlock
the driver’s door (
page 419) and
the trunk (
page 420).
Use the mechanical key to lock the
driver’s door (
page 420) and the
trunk (
page 116).
Have the vehicle battery and the
battery connections checked
(page 453).
If the SmartKey with KEYLESS-GO is
malfunctioning, contact an authorized
Mercedes-Benz Center.
!If battery check lamp5 does not
come on briefly during check, then the
SmartKey with KEYLESS-GO batteries
are discharged.
Replace the batteries (
page 435).
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.iTo prevent a possible inadvertent
lockout, the trunk will open
automatically if a SmartKey with
KEYLESS-GO* is recognized inside the
vehicle or in the trunk.