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7 IntroductionProduct information
Kindly observe the following in your own best interest:
We recommend using Mercedes-Benz original parts as well as conversion parts and accessories 
explicitly approved by us for your vehicle model.
We have tested these parts to determine their reliability, safety and their special
suitability for Mercedes-Benz vehicles.
We are unable to make an assessment for other products and therefore cannot be held responsible 
for them, even if in individual cases an official approval or authorization by governmental or other 
agencies should exist. Use of such parts and accessories could adversely affect the safety, performance
or reliability of your vehicle. Please do not use them.
Mercedes-Benz original parts as well as conversion parts and accessories approved by us are available 
at your authorized Mercedes-Benz Center where you will receive comprehensive information, also on 
permissible technical modifications, and where proper installation will be performed.
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33 Central locking system
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Locking and unlocking with remote control
Unlocking:
Press transmit button Œ. All turn signal lamps blink 
once to indicate that the vehicle is unlocked.
The remote control can be programmed for two kinds of 
unlocking modes (see below):
Selective unlocking mode –
Press transmit button Œ once to unlock driver’s door 
and fuel filler flap.
Press transmit button Œ twice to unlock all doors, 
fuel filler flap, and trunk.
Global unlocking mode –
Press transmit button Œ once to unlock all doors, 
fuel filler flap, and trunk.
Notes:
If the trunk was previously locked separately, it will 
remain locked, see page 41.
The presently active unlocking mode (selective or 
global) can only be determined by unlocking the vehicle 
with the remote control (see below for changing mode).If within 40 seconds of unlocking with the remote 
control, neither door or trunk is opened, the electronic 
key is not inserted in the starter switch, or the central 
locking switch is not activated, the vehicle will 
automatically lock.
Locking:
Press transmit button ‹ once. All turn signal lamps 
blink three times to indicate that the vehicle is locked. If 
they do not blink three times, a door or trunk is not 
properly closed.
Note:
If the vehicle cannot be locked or unlocked by pressing 
the transmit button, then it may be necessary to change 
the batteries in the electronic key (if ok, battery check 
lamp in electronic key will light briefly when pressing 
transmit button) or to synchronize the remote control, 
see pages 357 and 359.
Choosing global or selective mode on remote control
Press and hold transmit buttons‹ andŒ 
simultaneously for five seconds to reprogram the 
remote control. Battery check lamp will blink two times 
indicating the completed mode change.
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52 Seats
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Manual seat
(Standard equipment on model C 240)We recommend to adjust the seat in the following order:
1Fore/aft adjustment
Lift handle (1), slide seat to desired position and 
allow handle to reengage. Check for proper 
engagement before driving.
2Seat cushion tilt
Turn handwheel (2) forward or backward.
3Seat height adjustment
Press the switch (3) in the direction of the arrow 
until your legs are lightly supported.
4Backrest tilt
Press the switch (4) in the direction of the arrow 
until your arms are slightly angled when holding 
the steering wheel.
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57 Seats
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Multicontour seat (optional)
We recommend to adjust the multicontour seat in the 
following order:
1Seat cushion depth
2Backrest bottom
3Backrest center
4Side bolster adjustmentSome models may be equipped with driver’s 
multicontour seat. These seats have movable seat 
cushions and inflatable air cushions built into the 
backrest to provide additional lumbar and side support.
The seat cushion movement and amount of backrest 
cushion height and curvature can be continuously 
varied with regulators (1, 2 and 3) after turning the 
electronic key in starter switch to position 2.
The side bolsters of the backrest can be adjusted with 
rocker switch (4):
•press to the left – 
increase side support,
•press to the right – 
decrease side support.
If the engine is turned off, the last cushion setting is 
retained in memory, and automatically adjusts the 
cushion to this setting when the engine is restarted.
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74 Restraint systems
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
If the lamp does not come on at all or if it fails to 
extinguish or if it comes on thereafter, a malfunction in 
the system has been detected.
The following system components are monitored or 
undergo a self-check: crash-sensor(s), airbag ignition 
circuits, front seat belt buckles, emergency tensioning 
retractors, seat sensor.
Have the system checked at your authorized 
Mercedes-Benz Center immediately.
In the operational mode, after the indicator lamp has 
gone out following the initial check, interruptions or 
short circuits in the airbag ignition circuit and in the 
driver and front passenger seat belt buckle harnesses, 
and low voltage in the entire system are detected and 
indicated.Note:
See page 289 for information on the supplemental 
restraint system (SRS) indicator lamp.
Wa r n i n g !
In the event a malfunction of the “SRS” is indicated 
as outlined above, the “SRS” may not be 
operational. For your safety, we strongly 
recommend that you visit an authorized 
Mercedes-Benz Center immediately to have the 
system checked; otherwise the “SRS” may not be 
activated when needed in an accident, which could 
result in serious or fatal injury, or it might deploy 
unexpectedly and unnecessarily which could also 
result in injury.
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123 Multifunction steering wheel, multifunction display
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index To return menu “SETTINGS” (2) to its factory 
setting:
•Call up the individual setting preliminary 
display (1) or display (2).
•Press the reset knob on the instrument cluster 
(see page 98) for approximately 3 seconds. 
Display (3) will appear.
•Press the reset knob on the instrument cluster once 
more. The menu “SETTINGS” is reset to factory 
settings, acknowledged by display (4).
The individual setting preliminary display (1) will 
appear if you do not press the reset knob on the 
instrument cluster within about 5 seconds. The 
setting menus will not be reset.Note:
For safety reasons, the individual setting “LIGHT 
CIRCUIT HEADLAMP MODE” in menu “LIGHTING” 
cannot be reset while driving, see page 130. If an 
attempt is made, the message “LIGHTING” – “CANNOT 
BE COMPLETELY RESET TO FACTORY SETTINGS 
WHILE DRIVING” will be displayed.
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130 Multifunction steering wheel, multifunction display
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
To return menu “LIGHTING” (3 to 6) to its factory 
setting:
•Call up menu (3 to 6).
•Press the reset knob on the instrument cluster (see 
page 98) in the instrument cluster for approximately 
3 seconds. Display (7) will appear.
•Press the reset knob on the instrument cluster once 
more. The individual setting menu “LIGHTING” is 
reset to factory settings, acknowledged by 
display (8).
The individual setting display “SETTINGS” (2) will 
appear if you do not press the reset knob on the 
instrument cluster within about 5 seconds. The 
setting menus will not be reset.Note:
For safety reasons, the individual setting “LIGHT 
CIRCUIT HEADLAMP MODE” in menu “LIGHTING” 
cannot be reset while driving. If an attempt is made, the 
message “LIGHTING” – “CANNOT BE COMPLETELY 
RESET TO FACTORY SETTINGS WHILE DRIVING” will 
be displayed.
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143 Exterior lamp switch
Te ch n i c a l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Exterior lamp switch
MOff
UAutomatic headlamp mode, see below.
CParking lamps (also side marker lamps, taillamps, 
licence plate lamps, instrument panel lamps) 
Canada only: When the engine is running, the low 
beam is additionally switched on.
BParking lamps plus low beam or high beam 
headlamps (combination switch pushed forward).ˆStanding lamps, right (turn left one stop)
‚Standing lamps, left (turn left two stops)
‡Front fog lamps (pull out one stop) with parking 
lamps and/or low beam headlamps on. Green 
indicator in lamp switch comes on.
†Rear fog lamp (pull out to second detent) in 
addition to the front fog lamps. Yellow indicator in 
lamp switch comes on.
Note:
With the electronic key removed and the driver’s door 
open, a warning sounds if the vehicle’s exterior lamps 
(except standing lamps) are not switched off.
Fog lamps will operate with the parking lamps and / or 
the low beam headlamps on. Fog lamps should only be 
used in conjunction with low beam headlamps. Consult 
your State or Province Motor Vehicle Regulations 
regarding allowable lamp operation.
Fog lamps are automatically switched off when the 
exterior lamp switch is turned to positionM orU.
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