heating MERCEDES-BENZ C-Class SEDAN 2012 W204 Owner's Manual

CareCarpets .......................................... 289
Car wash ........................................ 284
Display ........................................... 288
Exterior lights ................................ 287
Gear or selector lever ....................288
Matte finish ................................... 285
Notes ............................................. 283
Paint .............................................. 285
Plastic trim .................................... 288
Power washer ................................ 284
Rear view camera .......................... 287
Roof lining ...................................... 289
Seat belt ........................................ 289
Seat cover ..................................... 288
Sensors ......................................... 287
Steering wheel ............................... 288
Tail pipes ....................................... 287
Trim pieces .................................... 288
Washing by hand ........................... 284
Wheels ........................................... 285
Windows ........................................ 286
Wiper blades .................................. 286
Wooden trim .................................. 288
Cargo tie down rings ......................... 258
Car wash (care) ................................. 284
CD player/CD changer (on-board
computer) .......................................... 202
Cell phone see Mobile phone
Center console ..................................... 32
Central locking Automatic locking (on-board
computer) ...................................... 208
Locking/unlocking (SmartKey) ........70
Changing bulbs
Brake lamps ................................... 116
Cornering light function .................115
High-beam headlamps ...................115
Important safety notes ..................113
Low-beam headlamps ....................114
Overview of bulb types ..................114
Parking lamps ................................ 115
Reversing lamps ............................ 116
Standing lamps (front) ...................115
Child-proof locks
Important safety notes ....................57
Rear doors ....................................... 57Children
In the vehicle ................................... 53
Restraint systems ............................ 53
Child seat
LATCH-type (ISOFIX) child seat
anchors ............................................ 55
Special seat belt retractor ...............55
Top Tether ....................................... 56
Cigarette lighter ................................ 262
Climate control Automatic climate control (3-
zone) .............................................. 125
Controlling automatically ...............127
Cooling with air dehumidification ..126
Defrosting the windows .................130
Defrosting the windshield ..............129
Dual-zone automatic climate
control ........................................... 123
Important safety notes ..................122
Indicator lamp ................................ 127
Maximum cooling .......................... 130
Notes on using automatic climate
control ................................... 124, 126
Overview of systems ......................122
Problems with cooling with air
dehumidification ............................ 127
Problem with the rear window
defroster ........................................ 130
Rear control panel .........................125
Refrigerant ..................................... 350
Setting the air distribution .............128
Setting the airflow .........................129
Setting the air vents ......................131
Setting the climate mode (AIR
FLOW) ............................................ 127
Setting the temperature ................128
Switching air-recirculation mode
on/off ............................................ 130
Switching on/off ........................... 126
Switching residual heat on/off ......131
Switching the rear window
heating on/off ............................... 130
Switching the ZONE function on/
off .................................................. 129
Cockpit
Overview .......................................... 28
see Instrument cluster 6Index

F
Filler cap see Fuel filler flap
First-aid kit ......................................... 292
Flat tire Changing a wheel/mounting the
spare wheel ................................... 293
MOExtended run-flat system .........297
Preparing the vehicle .....................293
Raising the vehicle .........................295
Floormat ............................................. 276
Frequencies Garage door opener .......................275
Front fog lamps ................................. 108
Display message ............................ 223
Switching on/off ........................... 108
Front windshield
see Windshield
Fuel
Additives ........................................ 348
Consumption statistics ..................199
Displaying the current
consumption .................................. 199
Displaying the range ......................199
Driving tips .................................... 155
Flexible fuel vehicles ......................347
Fuel gauge ....................................... 29
Important safety notes ..................347
Premium-grade unleaded gasoline . 347
Problem (malfunction) ...................153
Refueling ........................................ 150
Specifications ................................ 348
Tank content/reserve fuel .............346
Fuel filler flap
Emergency release ........................151
Opening/closing ............................ 151
Fuel level
Calling up the range (on-board
computer) ...................................... 199
Fuel tank
Capacity ........................................ 346
Problem (malfunction) ...................153
Fuse allocation chart (vehicle tool
kit) ...................................................... 292
Fuses Allocation chart ............................. 305
Before changing ............................. 305Dashboard fuse box .......................305
Fuse box in the engine
compartment ................................. 306
Fuse box in the trunk .....................306
Important safety notes ..................305
G
Garage door opener Clearing the memory .....................274
Frequencies ................................... 275
Notes ............................................. 270
Opening/closing the garage door ..273
Programming (button in the rear-
view mirror) ................................... 271
Gasoline ............................................. 150
Gear indicator (on-board
computer) .......................................... 210
Gear or selector lever (cleaning
guidelines) ......................................... 288
Genuine Mercedes-Benz parts ......... 342
Glove box ........................................... 254
H
Handbrake see Parking brake
Hazard warning lamps ...................... 109
Headlamp cleaning system Notes ............................................. 351
Headlamps
Adding fluid to cleaning system .....281
Cleaning system (function) ............109
Fogging up ..................................... 112
see Automatic headlamp mode
Head restraints
Adjusting ......................................... 95
Adjusting (electrically) .....................96
Adjusting (manually) ........................95
Adjusting (rear) ................................ 96
Installing/removing (rear) ................97
Luxury .............................................. 96
see NECK-PRO head restraints
see NECK-PRO head restraints/
NECK-PRO luxury head restraints
Heating
see Climate control
10Index

Position of exterior mirror, front-
passenger side ............................... 102
Rear view camera .......................... 181
see PARKTRONIC
Parking aid
Parking Guidance ........................... 178
see Exterior mirrors
see PARKTRONIC
Parking brake
Display message ............................ 216
Notes/function .............................. 154
Parking Guidance
Display message ............................ 230
Important safety notes ..................178
Parking lamps (changing bulbs) ...... 115
PARKTRONIC Deactivating/activating .................177
Driving system ............................... 175
Function/notes ............................. 175
Problem (malfunction) ...................178
Range of the sensors .....................176
Warning display ............................. 177
PASSENGER AIR BAG OFF indicator
lamp ...................................................... 42
Pedals ................................................. 155
Permanent four-wheel drive see 4MATIC (permanent four-
wheel drive)
Plastic trim (cleaning instructions) . 288
Power washers .................................. 284
Power windows see Side windows
PRE-SAFE ®
Brake (vehicles with
DISTRONIC PLUS) Display message ............................ 218
Function/notes ................................ 65
Switching on/off ........................... 205
Warning lamp ................................. 249
Preventive occupant safety
system
see PRE-SAFE ®
(Preventive
occupant safety system)
Product information ............................ 21
Program selector button .................. 144
Pulling away Automatic transmission .................139Q
Qualified specialist workshop ........... 24
R
RACE START (AMG vehicles) ............. 174
RACETIMER (on-board computer) .... 211
Radar sensor system Activating/deactivating .................208
Display message ............................ 229
Radio
Selecting a station .........................201
see separate operating instructions
Reading lamp ..................................... 112
Rear compartment Setting the airflow .........................129
Setting the air vents ......................133
Rear fog lamp
Display message ............................ 223
Switching on/off ........................... 108
Rear seat
Display message ............................ 237
Folding the backrest forwards/
back ............................................... 257
Rear view camera
Cleaning instructions .....................287
Function/notes ............................. 181
Rear-view mirror
Anti-glare (manual) ........................101
Dipping (automatic) .......................102
Rear window blind ............................ 261
Rear window defroster Problem (malfunction) ...................130
Rear window heating
Switching on/off ........................... 130
Rear window wiper
Replacing the wiper blade .............. 118
Switching on/off ........................... 117
Refueling
Fuel gauge ....................................... 29
Important safety notes ..................150
Refueling process ..........................151
see Fuel
Releasing the parking lock
manually (automatic
transmission) ..................................... 149
14Index

Remote controlGarage door opener .......................270
Reporting safety defects .................... 25
Reserve (fuel tank) see Fuel
Reserve fuel
Display message ............................ 228
Warning lamp ................................. 246
see Fuel
Residual heat (climate control) ........ 131
Restraint system see SRS (Supplemental Restraint
System)
Reverse gear
Engaging (automatic
transmission) ................................. 142
Roadside Assistance (breakdown) .... 22
Roller blind see Roller sunblind
Roller sunblind
Panorama roof with power tilt/
sliding panel ..................................... 88
Rear side windows .........................261
Rear window .................................. 261
Roof carrier ........................................ 259
Roof lining and carpets (cleaning
guidelines) ......................................... 289
Roof load (maximum) ........................ 351
Route see Route guidance (navigation)
Route guidance (navigation) ............ 200
S
Safety Children in the vehicle .....................53
Child restraint systems ....................53
Occupant Classification System
(OCS) ............................................... 42
Overview of occupant safety
systems ........................................... 36
Safety systems
see Driving safety systems
Seat belts
Adjusting the height ......................... 51
Belt force limiters ............................ 52
Cleaning ......................................... 289
Correct usage .................................. 49
Emergency Tensioning Devices ........ 52
Fastening ......................................... 50
Important safety guidelines .............48
Releasing ......................................... 51
Safety guidelines ............................. 37
Special seat belt retractor ...............55
Warning lamp ................................. 239
Warning lamp (function) ................... 51
Seats
Adaptive seat backrests (AMG
vehicles) .......................................... 97
Adjusting (electrically) .....................94
Adjusting (manually and
electrically) ...................................... 94
Adjusting lumbar support ................97
Adjusting the 4-way lumbar
support ............................................ 97
Adjusting the head restraint ............95
Cleaning the cover .........................288
Correct driver's seat position ........... 92
Important safety notes ....................93
Seat heating problem ......................98
Seat ventilation problem ..................99
Storing settings (memory
function) ........................................ 103
Switching seat heating on/off .........98
Switching seat ventilation on/off ....98
Sensors (cleaning instructions) ....... 287
Service see ASSYST PLUS service interval
display
Service interval display
Displaying service messages .........283
Hiding service messages ...............283
Notes ............................................. 283
Service messages ..........................282
Service menu (on-board computer) . 206
Service products Brake fluid ..................................... 350
Capacities ...................................... 346
Coolant (engine) ............................ 350
Engine oil ....................................... 349
Fuel ................................................ 347
Important safety notes ..................344
Refrigerant (air-conditioning
system) .......................................... 350
Washer fluid ................................... 351Index15

Center consoleFunctionPage:Audio system/COMAND;
see the separate operating
instructions;c Seat heating98=s Seat ventilation98?5 PARKTRONIC
(Canada only)
175
A£ Hazard warning
lamps
109
B45 Indicator lamp42Cu Rear window roller
sunblind
261
FunctionPageDM Dynamic driving
package with sports mode
171
EStowage compartment254Ashtray262Cigarette lighter262Power socket263FSelector lever142GCup holder259HStowage compartment254IAudio/COMAND controllerJSelects the drive program14432Center consoleAt a glance

ProblemPossible causes/consequences and M SolutionsThe engine cannot be
started using the
SmartKey.The on-board voltage is too low.XSwitch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
XCheck the starter battery and charge it if necessary
( Y page 298).
or
XJump-start the vehicle ( Y page 301).
or
XConsult a qualified specialist workshop.The engine cannot be
started using the
SmartKey.The steering lock is mechanically blocked.XRemove the SmartKey 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 SmartKey is in
the vehicle.A door is open. Therefore, the SmartKey cannot be detected as
easily.XClose the door and try to start the vehicle again.There is interference from a powerful source of radio waves.XStart your vehicle with the SmartKey in the ignition lock.Doors
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
Do not carry heavy or hard objects in the
passenger compartment or trunk unless they
are firmly secured in place.
Doors77Opening/closingZ

injury to the head and neck in the event of an
accident or similar situation.
Do not drive the vehicle without the seat head
restraints. Head restraints are intended to
help reduce injuries during an accident.
! To avoid damage to the seats and the seat
heating, observe the following information:
R keep liquids from spilling on the seats. If
liquid is spilled on the seats, dry them as
soon as possible.
R if the seat covers are damp or wet, do not
switch on the seat heating. The seat
heating should also not be used to dry
the seats.
R clean the seat covers as recommended;
see the "Interior care" section.
R do not transport heavy loads on the
seats. Do not place sharp objects on the
seat cushions, e.g. knives, nails or tools.
The seats should only be occupied by
passengers, if possible.
R when the seat heating is in operation, do
not cover the seats with insulating
materials, e.g. blankets, coats, bags,
seat covers, child seats or booster seats.
! When you move the seats, make sure that
there are no objects in the footwell or
behind the seats. Otherwise, you could
damage the seats and the objects.
i The head restraints in the front seats are
equipped with the NECK-PRO system
( Y page 47). For this reason, it is not
possible to remove the head restraints
from the front seats.
Vehicles without the through-loading
feature: the head restraints cannot be
removed from the rear compartment seats.
Please contact an authorized Mercedes-
Benz Center for more information.
i Other topics:
R Rear bench seat through-loading feature
( Y page 256)Adjusting the seats manually and
electrically:Backrest angle;Seat height=Seat cushion angle?Seat fore-and-aft adjustment
i AMG vehicles are equipped with a seat
with an integrated head restraint. It is
therefore not possible to set the height and
angle of the head restraint.
i Adjust the seat cushion angle so that your
thighs are lightly supported.
Seat fore-and-aft adjustment
XLift handle ? and slide the seat forwards
or backwards.XRelease lever ? again.
Make sure that you hear the seat engage in
position.
Seat cushion angle
XTurn handwheel = in the desired direction.
Adjusting the seats electrically
i Vehicles without Memory function: the
seats can be adjusted within three minutes
of a front door being opened.
94SeatsSeats, steering wheel and mirrors

:To adjust the upper back support;To adjust the contour of the backrest in
the lumbar region=To adjust the lateral structure and support
of the seatXMake sure that the SmartKey is in position
2 in the ignition lock.
i
If, after a certain amount of time, the seat
no longer has the desired contour, repeat
the adjustment.
Switching the seat heating on/off
Switching on/off
GWARNING
Repeatedly setting the seat heating to level
3 may result in excessive seat temperatures.
The health of passengers that have limited
temperature sensitivity or a limited ability to
react to excessively high temperatures may
be affected or they may even suffer burn-like
injuries. Therefore, do not use seat heating
level 3 repeatedly.
The three red indicator lamps in the button
indicate the heating level you have selected.
i If the battery voltage is too low, the seat
heating may switch off.
Driver's and front-passenger seat
The system automatically switches down
from level 3 to level 2 after approximately
eight minutes.
The system automatically switches down
from level 2 to level 1 after approximately ten
minutes.
The system automatically switches off
approximately 20 minutes after it is set to
level 1.
XMake sure that the SmartKey is in position
1 or 2 in the ignition lock.XTo switch on: press button : repeatedly
until the desired heating level is set.XTo switch off: press button : repeatedly
until all the indicator lamps go out.
Problems with the seat heating
The seat heating has switched off
prematurely or cannot be switched on. The
vehicle's electrical system voltage is too low
because too many electrical consumers are
switched on.
XSwitch off electrical consumers which you
do not need, such as the rear window
defroster or interior lighting.
Switching the seat ventilation on/off
Switching on/off
The three blue indicator lamps in the buttons
indicate the ventilation level you have
selected.
98SeatsSeats, steering wheel and mirrors

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

begin to fog on the inside, switching off the
air recirculation mode immediately should
clear interior window fogging. If interior
window fogging persists, make sure the air
conditioning is activated, or press the ¬
button.XTurn the SmartKey to position 2 in the
ignition lock.XTo activate: press the g button.
The indicator lamp in the g button lights
up.
i In the event of high pollution levels 14
or at
high outside temperatures, air-
recirculation mode is automatically
activated. When air-recirculation mode is
activated automatically, the indicator lamp
in the g button is not lit.
Outside air is added after about 30
minutes.
XTo switch off: press the g button.
The indicator lamp in the g button goes
out.
i Air-recirculation mode deactivates
automatically:
R after approximately five minutes if
outside temperatures are less than about
41 ‡ (5 †)
R after approximately five minutes if
cooling with air dehumidification is
deactivated
R after approximately 30 minutes if outside
temperatures are over about
41 ‡ (5 †)
Activating/deactivating the residual
heat function
The residual heat function is only available in
vehicles for Canada with automatic climate
control.
It is possible to make use of the residual heat
of the engine to continue heating the
stationary vehicle for up to 30 minutes after
the engine has been switched off. The heating
time depends on the temperature that has
been set.
i The blower will run at a low speed
regardless of the airflow setting.
i If you activate the residual heat function
at high temperatures, only the ventilation
will be activated. The blower runs at
medium speed.XTurn the SmartKey to position 0 in the
ignition lock or remove it.XTo activate: press the Ì button.
The indicator lamp in the Ì button lights
up.XTo switch off: press the Ì button.
The indicator lamp in the Ì button goes
out.
i Residual heat is deactivated
automatically:
R after about 30 minutes
R when the ignition is switched on
R if the battery voltage drops
R if the coolant temperature is too low
Setting the air vents
Important safety notes
GWARNING
When operating the climate control, the air
that enters the passenger compartment
through the air vents can be very hot or very
cold (depending on the set temperature). This
could cause burns or frostbite to unprotected
skin in the immediate area of the air vents.
Always keep sufficient distance between
unprotected parts of the body and the air
vents. If necessary, use the air distribution
adjustment to direct the air to air vents in the
14 Automatic climate control only.Setting the air vents131Climate controlZ