Page 100 of 474

98 Controls in detailLocking and unlockingUnlocking the trunk
You can unlock the trunk separately.
A minimum height clearance of 
6.2 ft (1.88 m) is required to open the 
trunk lid.
Press and hold button Š on the 
SmartKey until trunk unlocks.Loss of SmartKey or mechanical key
If you lose a SmartKey or mechanical key, 
you should do the following:
Have the SmartKey deactivated by an 
authorized Mercedes-Benz Center.
Report the loss of the SmartKey or the 
mechanical key to your car insurance 
company immediately.
If necessary, have the mechanical lock 
replaced.
Your authorized Mercedes-Benz Center 
will be glad to supply you with a replace-
ment. 
SmartKey with KEYLESS-GO*
Vehicles equipped with KEYLESS-GO come 
with two SmartKeys with KEYLESS-GO, 
each with remote controls and a remov-
able mechanical key.
The locking tabs for the mechanical key 
portion of the two SmartKeys with 
KEYLESS-GO are a different color to help 
distinguish each SmartKey with 
KEYLESS-GO unit.
The function of the SmartKey overrules the 
KEYLESS-GO function.
The KEYLESS-GO function is integrated 
into the SmartKey. On these vehicles, the 
validity of the SmartKey with KEYLESS-GO 
is checked every time you grasp a door 
handle. 
iIf the vehicle was previously centrally 
locked, the trunk lid will lock automati-
cally when closed. The turn signals will 
flash three times to confirm locking. 
     
        
        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 105 of 474

103 Controls in detail
Locking and unlocking
Selective setting
If you frequently travel alone, you may wish 
to reprogram the SmartKey with 
KEYLESS-GO so that grasping a door han-
dle only unlocks the driver’s door, interior 
lockable storage compartments and the 
fuel filler flap.
Press and hold buttons Œ and ‹ 
simultaneously for about six seconds 
until battery check lamp5 
(page 94) flashes twice.
The SmartKey with KEYLESS-GO will 
then function as follows:Unlocking the driver’s door and fuel fill-
er flap
Grasp the driver’s door handle.
All turn signals flash once. The locking 
knob in the driver’s door moves up. The 
anti-theft alarm system is disarmed.
Global unlocking
Grasp the door handle on the passen-
ger side.
All turn signals 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 or 
trunk lid.
All turn signals flash three times. The 
locking knobs in the doors move down. 
The anti-theft alarm system is armed.Restoring to factory setting
Press and hold buttons Œ and ‹ 
simultaneously for about six seconds 
until battery check lamp5 
(page 98) flashes twice.
!If you can no longer lock or unlock the 
vehicle with the SmartKey with 
KEYLESS-GO, then the battery in the 
SmartKey is discharged, the SmartKey 
with KEYLESS-GO is malfunctioning or 
the vehicle battery is drained.
Check the battery in the SmartKey 
with KEYLESS-GO (
page 97) and 
replace it if necessary 
(
page 377). 
     
        
        Page 106 of 474
104 Controls in detailLocking and unlocking
Global locking using the lock button at 
trunk lid
1Lock button at trunk lid
Press lock button 1 at trunk lid.
All turn signals flash three times. The 
locking knobs in the doors move down. 
The anti-theft alarm system is armed.
Use the mechanical key to unlock 
the driver’s door (
page 374).
Have the vehicle batteries and their 
connections checked 
(page 401).
Use the mechanical key to lock or 
unlock the doors (
page 376).
If the SmartKey with KEYLESS-GO is 
malfunctioning, contact an authorized 
Mercedes-Benz Center.
iVehicles with KEYLESS-GO*: To pre-
vent a possible inadvertent lockout, the 
trunk lid will open automatically if a 
SmartKey with KEYLESS-GO is recog-
nized inside the trunk.
When the hardtop is retracted, it must 
be completely lowered in the trunk be-
fore the trunk lid can be closed 
(page 235).
iYou can also lock the vehicle using the 
lock button at the outside door handle 
(page 60). 
     
        
        Page 107 of 474

105 Controls in detail
Locking and unlocking
Checking the battery
Press button ‹ or Œ.
Battery check lamp5 (
page 98) 
comes on briefly to indicate that the 
SmartKey batteries are in order.Unlocking the trunk
You can unlock the trunk separately.
A minimum height clearance of 
6.2 ft (1.88 m) is required to open the 
trunk lid.
The handle is located above the rear li-
cense plate recess.
1Handle
Pull on handle 1.
The vehicle unlocks the trunk lid only.
!If battery check lamp5 (
page 98) 
does not come on briefly during check, 
then the SmartKey battery is dis-
charged.
Replace the battery (
page 377). 
You can obtain the required battery at 
any authorized Mercedes-Benz Center.
iIf the vehicle was previously centrally 
locked, the trunk lid will lock automati-
cally when closed (
page 109). The 
turn signals will flash three times to 
confirm locking.
To prevent a possible inadvertent lock-
out, the trunk lid will open automatical-
ly if a SmartKey with KEYLESS-GO is 
recognized inside the trunk. 
     
        
        Page 125 of 474

123 Controls in detail
Lighting
 Lighting
For information on how to switch on the 
headlamps and use the turn signals, see 
“Switching on headlamps” (
page 51) 
and “Turn signals” (
page 52).
Exterior lamp switch
The exterior lamp switch is located on the 
dashboard to the left of the steering wheel.
MOff
Daytime running lamp mode 
(
page 125)
UAutomatic headlamp mode
Daytime running lamp mode 
(page 125)CParking lamps (also tail lamps, li-
cense plate lamps, side marker 
lamps, instrument panel lamps)
Canada only: When the engine is 
running, the low beam headlamps 
are also switched on.
BLow beam headlamps (or high 
beam headlamps when the combi-
nation switch is pushed forward) 
and parking lamps
ˆStanding lamps, right (turn left one 
stop)
‚Standing lamps, left (turn left two 
stops)
CIndicator lamp for parking lamps
‡Indicator lamp for front fog lamps
†Indicator lamp for rear fog lamp
iIf you drive in countries where vehicles 
drive on the other side of the road than 
the country in which the vehicle is reg-
istered, you must have the headlamps 
modified for symmetrical low beams. 
Relevant information can be obtained 
at any authorized Mercedes-Benz 
Center. 
     
        
        Page 131 of 474

129 Controls in detail
Lighting
Switching on the hazard warning 
flasher
Press hazard warning flasher 
switch1.
All turn signals are flashing.
Switching off the hazard warning 
flasher
Press hazard warning flasher switch1 
again.
Interior lighting
1Left reading lamp
2Right reading lamp
3Interior lighting on/off
4Slide switch for interior lighting controlAutomatic control 
Activating
Slide switch4 to the left.
Interior lamps are switched on in dark-
ness when you 
unlock the vehicle
open a door
remove the SmartKey from the 
starter switch
open the trunk
In addition, the entry/exit lamps in the 
door trays will come on when you open 
a door.
The interior lamps are switched off af-
ter a preset time (
page 155).
iWith the hazard warning flasher acti-
vated and the combination switch set 
for either left or right turn, only the re-
spective turn signals will operate when 
the ignition is switched on.iIf the hazard warning flasher was 
switched on automatically because of 
an airbag that has deployed, press haz-
ard warning flasher switch 1 once to 
switch it off.
iIf the door remains open, the interior 
lamps switch off automatically after ap-
proximately five minutes. 
     
        
        Page 217 of 474

215 Controls in detail
Driving systems
Setting to last stored speed (“Resume” 
function)
Briefly tip the cruise control lever in 
direction of arrow4 (
page 213).
Distronic is set to the last stored 
speed.
Remove your foot from the accelerator 
pedal.Deactivating Distronic 
There are several ways to deactivate the 
Distronic system:
Briefly tip the cruise control lever in 
direction of arrow3 (
page 213).
or
Step on the brake pedal.
Distronic will be deactivated. The last 
speed set will be stored into memory.Distronic deactivates automatically when
you set the parking brake
you drive slower than 25 mph 
(40 km/h)
the ESP is active (
page 82) or you de-
activate the ESP
You move the gear selector lever into 
positionN.
A signal will sound. The 
DTR off
 mes-
sage appears in the speedometer dis-
play for approximately five seconds.
Warning!
G
The speed stored in memory should only be 
set again if prevailing road conditions per-
mit. Possible acceleration or deceleration 
differences arising from returning to the pre-
set speed could endanger yourself and oth-
ers.
iThe last stored speed is deleted when 
you turn off the engine.
Warning!
G
Distronic switches off and releases the 
brakes when the vehicle decelerates below 
the minimum speed of 25 mph (40 km / h) 
by operation of the system. At that time the 
driver must apply the brakes in order to re-
duce vehicle speed further or bring it to a 
stop.