Page 101 of 474
99 Controls in detail
Locking and unlocking
If the SmartKey with KEYLESS-GO is valid, 
your vehicle unlocks 
the doors
the trunk lid
the glove box
the storage compartment under the 
armrest
the storage compartment in the rear
the fuel filler flap
SmartKey with KEYLESS-GO1‹Lock button
2Š Unlock button for the trunk lid
3Mechanical key locking tab
4ŒUnlock button
5Battery check lamp
6Â Panic button (
page 78)
For information on using the SmartKey 
buttons, see “SmartKey” (page 94).
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.  
     
        
        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 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 134 of 474

132 Controls in detailInstrument clusterDuring severe operating conditions, e.g. 
stop-and-go traffic, the coolant tempera-
ture 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
Make sure you are viewing the trip 
odometer display (
page 134).
If it is not displayed, press the j or 
k button on the multifunction 
steering wheel repeatedly until the trip 
odometer appears.
Press and hold reset button4 
(page 24) until the trip odometer is 
reset.
Tachometer
The red marking on the tachometer de-
notes excessive engine speed.
To help protect the engine, the fuel supply 
is interrupted if the engine is operated 
within the red marking.
!Excessive coolant temperature triggers 
the coolant temperature warning lamp 
(page 352) and a warning in the 
multifunction display (
page 328).
!Avoid driving at excessive engine 
speeds, as it may result in serious en-
gine damage that is not covered by the 
Mercedes-Benz Limited Warranty. 
     
        
        Page 140 of 474
138 Controls in detailControl systemMenus, submenus and functions
Menu 1
Menu 2
Menu 3
Menu 4
Menu 5
Menu 6
Menu 7
Menu 8
Standard dis-
play
AUDIO 
NAV
Distronic* 
Vehicle status 
message memory
Settings 
Trip computer
Telephone 
(page 139)
(page 139)
(page 142)
(page 142)
(page 143)
(page 144)
(page 159)
(page 161)
Commands/submenusDigital speedom-
eter
Selecting 
radio station
Activating 
route 
guidance
Calling up 
settings
Calling up vehicle 
malfunction, warn-
ing and system sta-
tus messages 
stored in memory
Resetting to 
factory set-
tings
Fuel consump-
tion statistics 
after start
Loading 
phone book
Calling up main-
tenance service 
indicator
Selecting 
satellite radio 
station*
(USA only)
Instrument 
cluster sub-
menu 
Fuel consump-
tion statistics 
since the last 
reset
Searching for 
name in 
phone book
Time 
submenu
Checking tire in-
flation pressure*
Operating CD 
player
Lighting sub-
menu
Calling up 
range
Checking engine 
oil level
Vehicle sub-
menuConvenience 
submenu 
     
        
        Page 161 of 474
159 Controls in detail
Control system
The selection marker is on the current 
setting.
Press æ or ç to switch function On or 
Off
. 
Trip computer menu
Use the trip computer menu to call up sta-
tistical data on your vehicle. The following 
information is available:Fuel consumption statistics after start
Press button ÿ or è repeatedly 
until you see the first function of the 
Trip computer menu.
Press button j or k repeatedly 
until you see this message in the left 
display: 
From start.
1Distance driven since start
2Average speed since start
3Time elapsed since start
4Average fuel consumption since start
Function
Page
Fuel consumption statistics after 
start
159
Fuel consumption statistics 
since last reset
160
Calling up range 
(distance to empty)
161
iThe last function called up will reap-
pear the next time you enter the trip 
computer menu. 
     
        
        Page 162 of 474

160 Controls in detailControl system
Fuel consumption since last reset
Press button ÿ or è repeatedly 
until you see the first function of the 
Trip computer menu.
Press button j or k repeatedly 
until you see this message in the left 
display: 
From reset.
1Distance driven since last reset
2Average speed since last reset
3Time elapsed since last reset
4Average fuel consumption since last re-
setResetting fuel consumption statistics
Press button ÿ or è repeatedly 
until you see the first function of the 
Trip computer menu.
Press button j or k repeatedly 
until you see the reading that you want 
to reset in the left display.
Press and hold the reset button in the 
instrument cluster (
page 25) until 
the value is reset to 0.
iAll statistics stored since the last en-
gine start will be reset approximately 
four hours after the SmartKey in the 
starter switch is turned to position0 or 
removed from the starter switch.
Resetting will not occur if you turn the 
SmartKey back to position1 or2 with-
in this time period. 
     
        
        Page 163 of 474

161 Controls in detail
Control system
Call up range (distance to empty)
Press button ÿ or è repeatedly 
until you see the first function of the 
Trip computer menu.
Press button j or k repeatedly 
until you see this message in the left 
display: 
Range
.
In the right display you will see the cal-
culated range based on the current fuel 
tank level.
TEL menu*
You can use the functions in the 
TEL
 menu 
to operate your telephone, provided it is 
connected to a hands-free system and 
switched on.
Switch on the telephone and COMAND.
Press button ÿ or è on the 
steering wheel repeatedly until you see 
the 
TEL
 menu in the left display.
Warning!
G
A driver’s attention to the road must always 
be his/her primary focus when driving. For 
your safety and the safety of others, we rec-
ommend that you pull over to a safe location 
and stop before placing or taking a tele-
phone call. If you choose to use the tele-
phone while driving, please use the 
hands-free device and only use the tele-
phone when weather, road, and traffic con-
ditions permit.
Some jurisdictions prohibit the driver from 
using a cellular telephone while driving a ve-
hicle.
Bear in mind that at a speed of just 30 mph 
(approximately 50 km/h), your vehicle is 
covering a distance of 44 feet (approximate-
ly 14 m) every second.
Never operate radio transmitters equipped 
with a built-in or attached antenna (i.e. with-
out being connected to an external antenna) 
from inside the vehicle while the engine is 
running. Doing so could lead to a malfunc-
tion of the vehicle’s electronic system, pos-
sibly resulting in an accident and/or 
personal injury.