Page 139 of 498

137 Controls in detail
Control system
Control system
The control system is activated as soon as 
the SmartKey in the starter switch is 
turned to position1 or as soon as the 
KEYLESS-GO* start/stop button is in 
position1. The control system enables you 
to
call up information about your vehicle
change vehicle settings
For example, you can use the control sys-
tem to find out when your vehicle is next 
due for service, to set the language for 
messages in the instrument cluster dis-
play, and much more.
The control system relays information to 
the multifunction display.
Multifunction display
1Outside temperature
2Trip odometer
3Automatic transmission program mode
4Main odometer
5Current gear selector lever position
For more information on menus displayed 
in the multifunction display, see “Menus” 
(page 140).
iThe displays for the audio systems (ra-
dio, CD player) will appear in English, 
regardless of the language selected.
Warning!
G
A driver’s attention to the road and traffic 
conditions must always be his /her primary 
focus when driving.
For your safety and the safety of others, 
selecting features through the multifunction 
steering wheel should only be done by the 
driver when traffic and road conditions 
permit it to be done safely.
Bear in mind that at a speed of just 30 mph 
(approximately 50 km/h), your vehicle is 
covering a distance of 44 feet (approxi-
mately 14 m) every second. 
     
        
        Page 245 of 498

243 Controls in detail
Audio system
Accepting an incoming call
If the telephone is active in the background 
(reception symbol is visible in the display), 
the audio source is muted when an incom-
ing call is received. A ringing tone can be 
heard and the caller’s telephone number, 
or the name under which the telephone 
number has been saved in the telephone 
book, appears in the display. If the caller’s 
number is not relayed, 
CALL
 will appear in 
the display.
Press s button.
The call is accepted.Muting a call
It is possible to mute a call; the caller is 
then no longer able to hear you.
Mute on
Press
MUT
 soft key.
MIC MUTE
 will appear in the display.
Mute off
Press
MUT
 soft key again.
Terminating a call
Press t button.
The current call is terminated and the 
muted audio source becomes active 
again.Accepting a second incoming call
If you receive another call during an al-
ready active call, you can accept the sec-
ond call and switch between the two.
Accepting a second call
Place new call by entering tele-
phone number manually.
You are connected to the second 
caller; the first caller is kept on hold.
iYou will be notified of the second call 
acoustically, but you will not see this in 
the display. 
     
        
        Page 380 of 498
378 Practical hintsWhat to do if …?Display symbol
Display message
Possible cause
Possible solution
G 
Display malfunction
Visit workshop
The instrument cluster display is malfunc-
tioning.
Continue driving with added caution.
Visit an authorized Mercedes-Benz 
Center as soon as possible.
The displays for several systems have 
malfunctioned. Some systems them-
selves may also have malfunctioned.
Have the electronic systems checked 
by an authorized Mercedes-Benz Cen-
ter.
± 
Display defective
Visit workshop!
Certain electronic systems are unable to 
relay information to the control system. 
The following systems may have failed:
Coolant temperature display
Tachometer
Cruise control display
Have the electronic systems checked 
by an authorized Mercedes-Benz Cen-
ter.
J 
Doors open!
You are attempting to drive with one or 
more doors open.
Close the doors. 
     
        
        Page 458 of 498

456 Technical termsCOMAND
(C
ockpit M
anagement and D
ata Sys-
tem)
Information and operating center for 
vehicle sound and communications 
systems, including the radio and the 
navigation system, as well as other op-
tional equipment (CD changer, tele-
phone, etc.).
Control system
The control system is used to call up 
vehicle information and to change 
component settings. Information and 
messages appear in the multifunction 
display. The driver uses the buttons on 
the multifunction steering wheel to 
navigate through the system and to ad-
just settings.
Cruise control
Driving convenience system for auto-
matically maintaining the vehicle speed 
set by the driver.Engine number
The number set by the manufacturer 
and placed on the cylinder block to 
uniquely identify each engine pro-
duced.
Engine oil viscosity
Measurement for the inner friction (vis-
cosity) of the oil at different tempera-
tures. The higher the temperature an 
oil can tolerate without becoming thin, 
or the lower the temperature it can tol-
erate without becoming viscous, the 
better the viscosity.
ESP
(E
lectronic S
tability Pr
ogram)
Improves vehicle handling and direc-
tional stability.
ETD
(E
mergency T
ensioning D
evice)
Device which deploys in certain frontal 
and rear collisions exceeding the sys-
tem's threshold to tighten the seat 
belts. 
->SRSFSS (Canada vehicles)
(F
lexible S
ervice S
ystem)
Maintenance service indicator in the 
multifunction display that informs the 
driver when the next vehicle mainte-
nance service is due. FSS evaluates en-
gine temperature, oil level, vehicle 
speed, engine speed, distance driven 
and the time elapsed since your last 
maintenance service, and calls for the 
next maintenance service accordingly.
Gear range
Number of gears which are available to 
the automatic transmission for shifting. 
The automatic gear shifting process 
can be adapted to specific operating 
conditions using the gear selector le-
ver.
GPS
(G
lobal P
ositioning S
ystem)
Satellite-based system for relaying 
geographic location information to and 
from vehicles equipped with special re-
ceivers. Employs CD digital maps for 
navigation.