2012 MERCEDES-BENZ C-Class SEDAN ECO mode

Stowage well beneath the trunk
floor .................................................... 258
Summer opening see Convenience opening feature
Summer tires ..................................... 312
Sun visor ............................................ 260
Supplemental Restraint System see SRS (Supplemental Restraint
System)
Surround lighting (on-board
computer) .......................................... 207
Switching air-recirculation mode
on/off ................................................. 130
Switching off the alarm (ATA) ............ 67
T
Tachometer ........................................ 195
Tail lamps Display message ............................ 223
Tank
see Fuel tank
Tank content
Fuel gauge ....................................... 29
Technical data
Notes ............................................. 342
Tires/wheels ................................. 335
Vehicle data ................................... 351
TELEAID
Call priority .................................... 268
Display message ............................ 218
Downloading destinations
(COMAND) ..................................... 269
Emergency call .............................. 266
Important safety notes ..................264
Locating a stolen vehicle ...............270
MB info call button ........................268
Remote vehicle locking ..................270
Roadside Assistance button ..........267
Search & Send ............................... 269
Self-test ......................................... 265
System .......................................... 265
Vehicle remote unlocking ..............269
Telephone
Accepting a call ............................. 203
Display message ............................ 237
Menu (on-board computer) ............202
Number from the phone book ........ 203
Redialing ........................................ 203
Rejecting/ending a call .................203
Temperature
Coolant .......................................... 194
Coolant (on-board computer) ......... 210
Engine oil (on-board computer) ...... 210
Outside temperature ...................... 195
Setting (climate control) ................128
Theft deterrent systems
ATA (Anti-Theft Alarm system) .........67
Immobilizer ...................................... 66
Through-loading feature ................... 256
Tilt/sliding sunroof see Sliding sunroof
Timing (RACETIMER) ......................... 211
Tiredness assistant see ATTENTION ASSIST
Tire pressure
Calling up (on-board computer) .....319
Checking manually ........................317
Display message ............................ 233
Maximum ....................................... 316
Notes ............................................. 315
Pressure loss warning ....................317
Recommended ............................... 313
Tire pressure monitoring system
Function/notes ............................. 319
Restarting ...................................... 321
Warning lamp ................................. 250
Tires
Aspect ratio (definition) .................333
Average weight of the vehicle
occupants (definition) ....................331
Bar (definition) ............................... 331
Characteristics .............................. 331
Checking ........................................ 311
Definition of terms .........................331
Direction of rotation ......................334
Display message ............................ 233
Distribution of the vehicle
occupants (definition) ....................334
DOT, Tire Identification Number
(TIN) ............................................... 330
DOT (Department of
Transportation) (definition) ............331
GAWR (Gross Axle Weight Rating)
(definition) ..................................... 332Index17

Product information
Mercedes-Benz recommends that you use
genuine Mercedes-Benz parts, conversion
parts and accessories that have been
approved for the type of vehicle.
Mercedes-Benz tests genuine parts as well as
conversion parts and accessories which have
been specifically approved for your vehicle for
their reliability, safety and suitability. Despite
ongoing market research, Mercedes-Benz is
unable to assess other parts. Therefore,
Mercedes-Benz accepts no responsibility for
the use of such parts in Mercedes-Benz
vehicles, even if they have been
independently or officially approved. The use
of non-approved parts could affect your
vehicle's operating safety. Mercedes-Benz
therefore recommends that you use genuine
Mercedes-Benz parts, conversion parts and
accessories that have been approved for the
type of vehicle. Genuine Mercedes-Benz
parts, approved conversion parts and
accessories are available from any authorized
Mercedes-Benz Center. Here, you will receive
advice about permissible technical
modifications, and the parts will be
professionally installed.
Operator's Manual
Notes on the Operator's Manual
This Operator's Manual contains a great deal
of helpful information. We urge you to read it
carefully and familiarize yourself with the
vehicle before driving.
For your own safety and longer service life of
the vehicle, we urge you to follow the
instructions and warnings contained in this
Operator's Manual. Ignoring them could
result in damage to the vehicle or personal
injury to you or others. Vehicle damage
caused by failure to follow instructions is not
covered by the Mercedes-Benz Limited
Warranty.
Vehicle equipment
This Operator's Manual describes all models
and all standard and optional equipment of
your vehicle available at the time of
publication of the Operator's Manual.
Country-specific differences are possible.
Please note that your vehicle may not be
equipped with all features described. This
also applies to safety-related systems and
functions. The equipment in your vehicle may
therefore differ from that shown in the
descriptions and illustrations. All the systems
found in your vehicle are listed in the original
purchase agreement of your vehicle. Should
you have any questions concerning
equipment and operation, please consult an
authorized Mercedes-Benz Center.
The Operating Instructions and the
Maintenance Booklet are important
documents and should be kept in the vehicle.
Service and vehicle operation
Service and literature
Your vehicle is covered under the terms of the
warranties printed in the Service and
Warranty Information booklet. Your
authorized Mercedes-Benz Center will
exchange or repair any defective parts
originally installed in the vehicle in
accordance with the terms of the following
warranties:
R New Vehicle Limited Warranty
R Emission Systems Warranty
R Emission Performance Warranty
R California, Connecticut, Maine,
Massachusetts, New York, Pennsylvania,
Rhode Island and Vermont Emission
Control Systems Warranty
R State Warranty Enforcement Laws (Lemon
Laws)
Introduction21

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Please read the information on qualified
specialist workshops ( Y page 24).
Occupant safety
Overview of occupant safety
In this section, you will learn the most
important facts about the restraint system
components of the vehicle.
The restraint system consists of:
R seat belts
R child restraint systems
R LATCH-type (ISOFIX) child seat anchors
Additional protection is provided by:
R SRS (Supplemental Restraint System)
R NECK-PRO head restraints/NECK-PRO
luxury head restraints
R Air bag system components with:
- PASSENGER AIR BAG OFF indicator lamp
- front-passenger seat with Occupant
Classification System (OCS)
The different air bag systems work
independently of each other. The protective
functions of the system work in conjunction
with each other. Not all air bags are deployed
in an accident.
GWARNING
Modifications to or work improperly
conducted on restraint system components
or their wiring, as well as tampering with
interconnected electronic systems, can lead
to the restraint systems no longer functioning
as intended.
Air bags or Emergency Tensioning Devices
(ETDs), for example, could deploy
inadvertently or fail to deploy in accidents
although the deceleration threshold for air
bag deployment is exceeded. Therefore,
never modify the restraint systems. Do not
tamper with electronic components or their
software.
i See "Children in the vehicle"
( Y page 53) for more information on
infants and children traveling with you in
the vehicle and restraints for infants and
children.
SRS (Supplemental Restraint System)
Introduction
SRS consists of:
R the 6 SRS warning lamp
R air bags
R air bag control unit (with crash sensors)
R Emergency Tensioning Devices
R belt force limiters
SRS reduces the risk of occupants coming
into contact with the vehicle's interior in the
event of an accident. It can also reduce the
effect of the forces to which occupants are
subjected during an accident.
SRS warning lamp
SRS functions are checked regularly when
you switch on the ignition and when the
engine is running. Therefore, malfunctions
can be detected in good time.
The 6 SRS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out no later than a few seconds
after the engine is started.
The SRS components are in operational
readiness when the 6 SRS warning lamp
is not lit while the engine is running .
36Occupant safetySafety

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Please read the information on qualified
specialist workshops ( Y page 24).
SmartKey
Important safety notes
GWARNING
When leaving the vehicle, always remove the
SmartKey from the ignition lock. Always take
the SmartKey with you and lock the vehicle.
Do not leave children unsupervised in the
vehicle, even if they are secured in a child
restraint system, and do not give them access
to an unlocked vehicle. A child's unsupervised
access to a vehicle could result in an accident
and/or serious personal injury. They could:
R injure themselves on vehicle parts
R be seriously or fatally injured by extreme
heat or cold
R injure themselves or have an accident with
vehicle equipment that may still be in
operation even after the SmartKey has
been removed from the ignition, such as the
seat adjustment, steering wheel
adjustment or memory function.
If children open a door, they could cause
severe or even fatal injury to other persons; if
they get out of the vehicle, they could injure
themselves when doing so or be seriously or
even fatally injured by any passing traffic.
Do not expose the child restraint system to
direct sunlight. The child restraint system's
metal parts, for example, could become very
hot, and a child could be burned on these
parts.GWARNING
If a key ring is too heavy or too large, the
weight acting on the SmartKey could cause it
to turn in the ignition lock or catch on the
steering wheel. This could cause the engine
to be switched off suddenly. You could lose
control of the vehicle and cause an accident.
Do not attach any heavy or large key rings to
the SmartKey that is inserted in the ignition.
General notes
If you cannot lock or unlock the vehicle with
the SmartKey, either the battery in the
SmartKey is discharged, the SmartKey is
faulty or the starter battery is discharged.
XCheck the battery in the SmartKey and
replace it if necessary ( Y page 74).XUnlock the driver's door using the
mechanical key ( Y page 79).XLock the vehicle using the mechanical key
( Y page 79).XHave the starter battery and the battery
contacts checked at a qualified specialist
workshop.
If the SmartKey is faulty, contact Roadside
Assistance or a qualified specialist workshop.
SmartKey functions
General notes
i USA only:
This device complies with Part 15 of the
FCC Rules. Operation is subject to the
following two conditions:
1. This device may not cause harmful
interference, and
2. this device must accept any interference
received, including interference that may
cause undesired operation.
70SmartKeyOpening/closing

XBriefly press emergency release
button :.
The trunk lid unlocks and opens.
The trunk lid can be unlocked and opened
with the trunk lid emergency release when
the vehicle is stationary or while driving.
Trunk lid emergency release light:
R emergency release button : flashes for
30 minutes after the trunk lid is opened.
R emergency release button : flashes for
60 minutes after the trunk lid is closed.
The trunk lid emergency release does not
open the trunk lid if the battery is
disconnected or discharged.
Side windows
Important safety notes
GWARNING
When opening or closing the door windows,
make sure that there is no danger of anyone
being harmed by the opening/closing
procedure.
The door windows are equipped with
automatic operation and the anti-entrapment
feature. If in automatic mode a door window
encounters an obstruction that blocks its
path, the anti-entrapment feature will stop the
door window and open it slightly.
The door windows operate differently when
the switch is pulled. See the "Problems with
door windows" section for details.
The closing of the door windows can be
immediately halted by releasing the switch or,
if the switch was pulled past the resistance
point and released, by either pressing or
pulling the respective switch.
If a door window encounters an obstruction
that blocks its path in a circumstance where
you are closing the windows by pressing and
holding the & button on the SmartKey or
by pressing and holding the lock button
(vehicles with KEYLESS-GO) on an outside
door handle, the anti-entrapment feature will
not operate.
Activate the override switch when children
are riding in the back seats of the vehicle. The
children may otherwise injure themselves,
e.g. by becoming trapped in the door window
opening.GWARNING
Do not keep any part of your body up against
the window pane when opening a window. The
downward motion of the pane may pull that
part of your body down between the window
pane and the door frame and trap it there. If
there is a risk of entrapment, release the
switch and pull it to close the window.
Opening and closing the side
windows
:Front left;Front right=Rear right?Rear leftSide windows83Opening/closingZ

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Please read the information on qualified
specialist workshops ( Y page 24).
Exterior lighting
Important safety notes
For reasons of safety, Mercedes-Benz
recommends that you drive with the lights
switched on even during the daytime. In some
countries, operation of the headlamps varies
due to legal requirements and self-imposed
obligations.
Information about driving abroad
Converting to symmetrical low beam
when driving abroad: switch the headlamps
to symmetrical low beam in countries in
which traffic drives on the opposite side of the
road to the country where the vehicle is
registered. This prevents glare to oncoming
traffic. Symmetrical lights do not illuminate
as large an area of the edge of the road.
Have the headlamps converted at a qualified
specialist workshop, e.g. an authorized
Mercedes-Benz Center, as close to the border
as possible before driving in these countries.
Converting to asymmetrical low beam
after returning: have the headlamps
converted back to asymmetrical low beam at
a qualified specialist workshop, e.g. an
authorized Mercedes-Benz Center, as soon as
possible after crossing the border again.
Light switch
Operation
Depending on the date of manufacture of your
vehicle, the c or à symbol for the
automatic headlamp mode/daytime running
lamps is located on the light switch.
Illustration: light switch with the à symbol for
the automatic headlamp mode/daytime running
lamps
1 WLeft-hand standing lamps2XRight-hand standing lamps3TParking lamps, license plate and
instrument cluster lighting4 ÃAutomatic headlamp mode/daytime
running lamps5 LLow-beam/high-beam headlampsBRRear fog lampCNFront fog lamps 77
Only vehicles with front fog lamps have the fog lamps function.106Exterior lightingLights and windshield wipers

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Please read the information on qualified
specialist workshops ( Y page 24).
Overview of climate control systems
Important safety notes
GWARNING
Severe conditions (e.g. strong air pollution)
may require replacement of the filter before
its scheduled replacement interval. A clogged
filter will reduce the air volume to the interior
and the windows could fog up, impairing
visibility and endangering you and others.
Have a blocked filter replaced at a Mercedes-
Benz Center as soon as possible.
GWARNING
Follow the recommended settings for heating
and cooling given on the following pages.
Otherwise, the windows could fog up,
impairing visibility and endangering you and
others.
The automatic climate control adjusts the
temperature and the humidity of the vehicle
interior and filters undesired substances from
the air.
The automatic climate control is only
operational when the engine is running. 11
Optimum operation is only achieved if you
drive with the side windows and sliding
sunroof/panorama roof with power tilt/
sliding panel closed.
i Ventilate the vehicle for a brief period
during warm weather, e.g. using the
convenience opening feature ( Y page 84).
This will speed up the cooling process and
the desired vehicle interior temperature
will be reached more quickly.
i The integrated filter can filter out most
particles of dust and completely filters out
pollen. A clogged filter reduces the amount
of air supplied to the vehicle interior. For
this reason, you should always observe the
interval for replacing the filter, which is
specified in the Service Booklet. As it
depends on environmental conditions, e.g.
heavy air pollution, the interval may be
shorter than stated in the Service Booklet.
i It is possible that the residual heat
function may be activated automatically an
hour after the SmartKey is removed. The
vehicle is then ventilated for 30 minutes to
dry the air-conditioning system.11 Automatic climate control: the residual heat function can only be activated/deactivated when the ignition
is switched off.122Overview of climate control systemsClimate control

USA only
:To set the temperature, left (Y page 128);To defrost the windshield ( Y page 129)=To switch maximum cooling MAX COOL on/off ( Y page 130)?To activate/deactivate cooling with air dehumidification ( Y page 126)ATo switch the rear window defroster on/off ( Y page 130)BTo set the temperature, right ( Y page 128)CTo activate/deactivate air-recirculation mode ( Y page 130)DTo set the air distribution ( Y page 128)ETo increase the airflow ( Y page 129)FTo reduce the airflow ( Y page 129)GTo switch climate control on/off ( Y page 126)HTo set climate control to automatic ( Y page 127)Notes on using dual-zone automatic
climate control
The following contains notes and
recommendations on optimum use of dual-
zone automatic climate control.
R Activate climate control using the à and
¿ buttons. The indicator lamps in the
à and ¿ buttons light up.
R Set the temperature to 72 ‡ (22 †).
R Only use the "defrosting" function briefly
until the windshield is clear again.
R Only use "air-recirculation" mode briefly,
e.g. if there are unpleasant outside odorsor when in a tunnel. The windows could
otherwise fog up as, in air-recirculation
mode, no fresh air is drawn into the vehicle.
R Use the ZONE function to adopt the
temperature settings on the driver's side
for the front-passenger side as well. The
indicator lamp in the á button goes out.124Overview of climate control systemsClimate control