2011 MERCEDES-BENZ C-CLASS SALOON key battery

Problem (display message)
............147
Remote control .............................. 144
Axle load, permissible (traile rtow-
ing) ...................................................... 389 B
Bag hook ............................................ 308
Ball coupling Folding in ....................................... 218
Folding out ..................................... 217
BAS (Brake Assist System) .................73
Basic settings see Settings
BAS PLUS (Brake Assist System
PLUS) .................................................... 73
Battery (key) Checking .......................................... 87
Important safety notes ....................86
Replacing ......................................... 87
Battery (vehicle)
Charging ........................................ 349
Connecting .................................... 348
Disconnecting ................................ 348
Display message (12-button mul-
tifunctio nsteering wheel) ..............271
Display message (4-button multi-
function steering wheel) ................269
Important safety notes ..................346
Jump starting ................................. 350
Location ......................................... 347
Removing/fitting ........................... 348
Belt
see Seat belt
Belt force limiters (activation) ...........47
Belt tensioner Activation ......................................... 47
Function .......................................... .56
Blind Spo tAssist
Activating/deactivating .................238
Display message (12-button mul-
tifunctio nsteering wheel) ..............276
Notes/function .............................. 205
Trailer towing ................................. 207
see Active Blind Spot Assist Bonnet
Closing .......................................... .323
Display message (12-button mul-
tifunctio nsteering wheel) ..............286
Display message (4-button multi-
function steering wheel) ................284
Opening ......................................... 322
Boot
Emergency release ..........................95
Important safety guidelines .............92
Locking separatel y........................... 95
Opening/closing (automatically
from outside) ................................... 93
Opening (automatically from
inside) .............................................. 94
Boot lid
Display message (12-button mul-
tifunctio nsteering wheel) ..............286
Display message (4-button multi-
function steering wheel) ................284
Opening/closing .............................. 92
Opening dimensions ......................386
Brake Assist System
see BAS (Brake Assist System)
Brake fluid
Display message (12-button mul-
tifunctio nsteering wheel) ..............258
Display message (4-button multi-
function steering wheel) ................252
Notes ............................................. 383
Brake lamp
Display message (12-button mul-
tifunctio nsteering wheel) ..............265
Display message (4-button multi-
function steering wheel) ................262
Brake lamps
Adaptive .......................................... .74
Changin gbulbs .............................. 128
Brakes
ABS .................................................. 72
BAS .................................................. 73
BAS PLUS ........................................ 73
Brake fluid (notes) .........................383
Display message (12-button mul-
tifunctio nsteering wheel) ..............255
Display message (4-button multi-
function steering wheel) ................250
Driving tips .................................... 1756
Index

Instrumen
tcluster lighting
Multifunction steering wheel with
12 buttons ....................................... 37
Multifunctio nsteering wheel with
4b utton s......................................... 34
Instrument lighting
see Instrument cluster lighting
Integrated child seat
ICS padded pla ytable ...................... 65
Important safety guidelines .............63
Side hea drestraints ........................ .66
Storing, IC Spadded play table and
side head restraint s......................... 67
Intelligen tLight System
Activating/deactivatin g(12-but-
ton multifunctio nsteering wheel) ..240
Display message (12-button mul-
tifunctio nsteering wheel) ..............267
Setting the dipped-bea mhead-
lamps for driving on the right/left .240
Interior lighting ................................. 124
Automatic control system ..............124
Delayed switch-off (12-button
multifunctio nsteering wheel) ........241
Emergency lighting ........................125
Manual control ............................... 125
Overview ........................................ 124
Reading lamp ................................. 124
Interior motion sensor ........................81
ISOFIX child seat securing system ....60 J
Jack Storage location ............................ 335
Using ............................................. 343
Jump starting (engine) ......................350 K
Key Changing the battery .......................87
Checking the battery .......................87
Convenience closing feature ............97
Convenience opening feature ..........97
Display message (4-button multi-
function steering wheel) ................288
Door central locking/unlocking .......84 Emergency key element ................... 86
Loss
................................................. 88
Modifying the programming .............85
Positions (ignition lock) .................153
Problem (malfunction) .....................88
Starting the engine ........................155
KEYLESS-GO
Convenience closing ........................98
Display message (12-button mul-
tifunctio ndisplay) .......................... 289
Display message (4-button multi-
function display) ............................ 288
Locking ............................................ 85
Start/Stop button .......................... 153
Starting the engine ........................155
Unlocking ......................................... 85
Keyp ositions
Key ................................................ 153
KEYLESS GO .................................. 153
Keys
Display message (12-button mul-
tifunctio nsteering wheel) ..............289
Kickdown
Driving tips .................................... 163
Manual drive program ....................167
Kneebag ............................................... 50 L
Lamps see Warning and indicator lamps
Lane-change assistant
see Blind Spot Assist
Lane detection (automatic)
see Lane Keeping Assist
Lane Keeping Assist
Activating/deactivating .................238
Display message (12-button mul-
tifunction steering wheel) ..............275
Function/informatio n.................... 208
Lane package ..................................... 205
Lap time (RACETIMER) ......................245
Lashing eyelets ................................. 307
Lighting see Lights
Lights
Activating/deactivating the exte-
rior lighting delayed switch-off 14
Index

U
Unladen weight ................................. 384
Unlocking Emergency unlocking .......................91
From inside the vehicle (central
unlocking button) ............................. 90V
Vanity mirror (in sun visor) ..............315
Variable SPEEDTRONIC see SPEEDTRONIC
Vehicle
Correct use ...................................... 28
Data acquisition ............................... 29
Electronics ..................................... 377
Equipment ....................................... 26
Implied warranty .............................. 29
Individua lsettings .......................... 238
Leaving parked up .........................175
Locking (in an emergency) ...............91
Locking (key )................................... 84
Lowering ........................................ 344
Pulling away ................................... 155
Raising ........................................... 343
Registration ..................................... 28
Towing away .................................. 351
Tow-starting ................................... 351
Transporting .................................. 353
Unlocking (in an emergency) ...........91
Unlocking (key )................................ 84
Vehicle data ................................... 384
Vehicle battery
see Battery (vehicle)
Vehicle data ....................................... 384
see Technical data
Vehicle dimensions ...........................384
Vehicle emergency locking ................91
Vehicle identification number see VIN
Vehicle identification plate ..............379
Vehicle tool kit .................................. 335
Vehicle weights ................................. 384
Vents see Air vents
Video (DVD) ........................................ 234 Video DVD (12-button multifunc-
tion steering wheel)
..........................234
VIN ...................................................... 379 W
Warning and indicator lamps ABS ................................................ 293
Brakes ........................................... 293
Distance warning signa l................. 300
ESP ®
.............................................. 295
ESP ®
OFF ....................................... 295
LIM (cruise control) ........................ 178
LIM (DISTRONIC PLUS) ..................184
LIM (variable SPEEDTRONIC) .........181
PASSENGER AIRBAG OFF ................59
Reserve fuel ................................... 298
Seat bel t........................................ 291
SRS ................................................ 297
Tyr ep ressure monitor ...................300
Warning triangle ................................ 334
Washer fluid Display message (12-button mul-
tifunctio nsteering wheel) ..............288
Display message (4-button multi-
function steering wheel) ................285
see Windscreen washer system
Wheel bol ttightening torque ...........344
Wheel chock ...................................... 342
Wheels Changing/replacing .......................365
Changing awheel .......................... 341
Checking ........................................ 358
Cleaning ......................................... 328
Fitting awheel ............................... 344
Important safety notes ..................358
Removing awheel .......................... 344
Storing ........................................... 366
Tightening torque ........................... 344
Whee lsize/tyre size ...................... 366
Windowbag
Display message (12-button mul-
tifunctio nsteering wheel) ..............261
Display message (4-button multi-
function steering wheel) ................254
Operation ........................................ .5124
Index

If you activate the acoustic locking confirma-
tion function, you will hear the following,
depending on the date of production of the
vehicle:
R an acoustic signal when locking
or
R one acoustic signal when unlocking and
three when locking.
The audible signal can be activated and deac-
tivated using the on-board computer
(Y page 242).
X To unlockc entrally:press the%but-
ton.
If you do not open th evehicle within approx-
imately 40 seconds of unlocking:
R the vehicle is locked again.
R the anti-thef tsystem is primed again.
X To lock centrally: press the&button. KEYLESS-GO
You can start, loc korunlock the vehicle using
KEYLESS-GO .To do this, you only need carry
the key with you. When you touch the surface
of the sensors on the vehicle's outside door
handles, KEYLESS-GO establishes a radio
connection between the vehicle and the key.
When the engine is started and whilst you are
driving, KEYLESS-GO also checks whether a
valid key is in the vehicle by periodically
establishing radio contact.
When locking or unlockin gwith KEYLESS-GO,
the distance between the key and the door
handle you wish to lock or unloc kmust not
be greater than 1 m. X
To unlock the vehicle: touch the inner
surface of the door handle.
X To lock the vehicle: touch sensor sur-
face :.
X Convenience closing feature: touch
recessed sensor surface ;for an exten-
ded period (Y page 98).
If you pull on the handle of the boot lid/tail-
gate, only the boot/luggage compartmen tof
the vehicle is unlocked. Changing the settings of the locking
system
You can change the setting of the locking
syste mins uch a way that only the driver's
door and the fuel filler flap are unlocked. This
is useful if you frequently travel on your own.
X To change the setting: press and hold
down the %and& buttons simulta-
neously for approximately six seconds until
the battery check lamp (Y page 87)
flashes twice.
i If the setting of the locking system is
changed within the signal range of the vehi-
cle, pressing the &or% buttonlocks
or unlocks the vehicle.
The key now functions as follows:
X To unlock the driver's door: press the
% button once.
X To unlock centrally: press the%but-
ton twice.
X To lock centrally: press the&button. Key
85Opening and closing Z

The KEYLESS-GO function is changed as fol-
lows:
X
To unlock the driver's door: touch the
inner surface of the door handle on the
driver's door.
X To unlock centrally: touch the inner sur-
face of the door handle on the front-
passenger door or the rear door.
X To lock centrally: touch the outer sensor
surface on one of the door handles. Restoring the factory settings
X Press the %and& buttons simulta-
neously for approximately six seconds until
the battery check lamp flashes twice. Emergency key element
General notes If the vehicle can no longer be locked or
unlocked with the key, use the emergency
key element.
If you use the emergenc
ykey element to
unlock and open the driver's door or the boot
lid/tailgate, the anti-thef talarm system will
be triggered (Y page 80).
There are several ways to tur noff the alarm:
X To turn the alarm off with the key: press
the % or& button on the key.
or
X Insert the key into the ignition lock.
or
X To deactivate the alarm with KEYLESS-
GO: press the Start/Stop button in the igni-
tion lock. The key must be in the vehicle.
or
X Lock or unlock the vehicle using KEYLESS-
GO. The key must be outside the vehicle.
If you unlock the vehicle using the emergency
key element, the fuel filler flap will not be
unlocked automatically. X
To unlock the fuel filler flap: insert the
key in the ignition lock.
Removing the emergency key element X
Push release catch :in the direction of
the arrow and at the same time, remove
emergency key element ;from the key. Key battery
Important safety notes Have the batteries changed at a qualified spe-
cialist workshop. G
WARNING
Batteries are toxic and contain caustic sub-
stances. For this reason, keep batteries out of
the reach of children.
If a battery has been swallowed, visi tadoctor
immediately. H
Environmental note Batteries contain pollutants.
It is illegal to dispose of them
with the household rubbish.
They must be collected sep-
arately and disposed of in an
environmentally responsible
recycling system. Dispose of batteries in an
environmentally responsible
manner. Take discharged
batteries to a qualified spe-
cialist workshop or to a col-86
KeyOpening and closing

lection point for used batter-
ies.
Checking the battery X
Press the &or% button.
The battery is working properly if the bat-
tery check lamp :lights up briefly
If battery check lamp :does not light up
briefly during the test, the battery is dis-
charged.
X Changing the battery (Y page 87)
i If the key battery is checked within the
signal receptio nrange of the vehicle, press-
ing the &or% button locks or
unlocks the vehicle.
Changing the battery You require a CR 2025 3 V cell battery.
X Take the emergency key elemen tout of the
key (Y page 86). X
Press emergency key element ;into the
opening in the key in the direction of the
arrow until battery tray cover :opens.
When doing so, do no thold cover :shut.
X Remove battery tray cover :. X
Repeatedly tap the key against your palm
until battery =falls out.
X Insert the new battery with the positive ter-
minal facing upwards. Use a lint-free cloth
to do so.
X Make sure that the surface of the battery is
free from lint, grease and all other forms of
contamination.
X Insert the front tabs of battery tray
cover :and then press to close it.
X Insert the emergency key element into the
key.
X Check the function of all key buttons on the
vehicle. Key
87Opening and closing Z

Problems with the key
Problem Possible causes/consequences and
M Solutions
You cannot lock or
unlock the vehicle
using the key. The key battery is discharged or nearly discharged.
X
Try again to lock/unlock the vehicle using the remote control
function of the key. Point the tip of the key at the driver's door
handle from close range and press the %/& button.
If this does not work:
X Check the key battery (Y page 87) and replace it if necessary
(Y page 87).
X Lock (Y page 91) or unlock (Y page 91) the vehicle using
the emergency key element. The key is faulty.
X
Lock (Y page 91) or unlock (Y page 91) the vehicle using
the emergency key element.
X Have the key checked at a qualified specialist workshop. You can no longer lock
or unlock the vehicle
using KEYLESS-GO. There is interference from a powerful source of radio waves.
X
Lock/unlock the vehicle using the remote control function of
the key. Point the tip of the key at the driver's door handle from
close range and press the %/& button. There is a fault with KEYLESS-GO.
X
Lock/unlock the vehicle using the remote control function of
the key. Point the tip of the key at the driver's door handle from
close range and press the %/& button.
X Have KEYLESS-GO checked at a qualified specialist workshop.
If this does not work:
X Check the key battery (Y page 87) and replace it if necessary
(Y page 87).
X Lock (Y page 91) or unlock (Y page 91) the vehicle using
the emergency key element. You have lost a key. X
Have the key deactivated at a qualified specialist workshop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. You have lost the emer-
gency key element. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. 88
KeyOpening and closing

Problem Possible causes/consequences and
M Solutions
The engine cannot be
started using the key. The on-board voltage is too low.
X
Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary
(Y page 346).
or
X Jump-start the vehicle (Y page 350).
or
X Consult a qualified specialist workshop. The engine cannot be
started using the key. The steering lock is mechanically blocked.
X
Remove the key and reinsert it into the ignition lock. While doing
this, turn the steering wheel in both directions. The engine cannot be
started using KEYLESS-
GO. The key is in the
vehicle. Ad
oor is open. Therefore, the key cannot be detected as easily.
X Close the door and try to start the vehicle again. There is interference from a powerful source of radio waves.
X
Start your vehicle with the key in the ignition lock. Doors
Important safety notes
G
WARNING
Only for the United Kingdom: if the vehicle
has been locked with the key, the double lock
function is activated as standard. It is then not
possible to open the doors from inside the
vehicle.
Therefore, do not leave any people behind in
the vehicle, particularly children, elderly peo-
ple or people in need of special assistance if
the vehicle has been locked with the key. As
a result, they may not be able to free them-
selves in the event of an emergency. As a
result, they could be seriously or even fatally
injured by prolonged exposure to extremely
high or low temperatures, for example. In this
case, rescuing people from outside the vehi-
cle is difficult. Deactivate the interior motion sensor before
you lock the vehicle with the key. The doors
can then be opened from the inside after the
vehicle has been locked from the outside with
the key.
G
WARNING
If children are left unsupervised in the vehicle,
they could:
R open a door from inside the vehicle at any
time, even if it has been locked
R start the vehicle using akey which has been
left in the vehicle
R release the parking brake
They could thereby endanger themselves and
others. Never leave children unsupervised in
the vehicle. Always take the key with you
when leaving the vehicle, even if you are only
leaving it for a short time. Doors
89Opening and closing Z