check engine light MERCEDES-BENZ C-CLASS SALOON 2011 Owners Manual

Convenience opening/closing (air
recirculation
)................................. 142
Cooling with aird ehumidification..137
Demisting the windows .................. 140
Demisting the windscreen .............140
Important safety notes ..................134
Indicator lamp ................................ 138
Notes on using THERMATIC auto-
matic climate control .....................135
Notes on using THERMOTRONIC
automatic climate control ..............137
Overview of systems ......................134
Problems with cooling with air
dehumidification ............................ 138
Problem with the rear window
heating .......................................... 141
Rea rcontrol panel ......................... 136
Setting the aird istribution.............139
Setting the airflow .........................139
Setting the airv ents...................... 147
Setting the climate mode (AIR
FLOW) ............................................ 138
Setting the temperature ................138
Switching air-recirculation mode
on/off ............................................ 141
Switching on/off ........................... 137
Switching residual hea ton/off ......142
Switching the ZONE function on/
off .................................................. 140
THERMATIC automatic climate
control (2-zone) ............................. 135
THERMOTRONIC (3-zone) auto-
matic climate control .....................136
Coat hooks ......................................... 310
Cockpit Overview .......................................... 32
see Instrument cluster
COMAND Online
see separate operating instructions
Combination switch ..........................120
Combine dluggage cover and net ....309
Constant headlamp mode see Daytime driving lamps
Consumption statistics
On-board computer (12-button
multifunctio nsteering wheel) ........231
On-board computer (4-button
multifunctio nsteering wheel) ........226Convenience closing feature
..............97
Convenience opening/closing (air-
recirculation mode) ........................... 142
Convenience opening feature ............97
Coolan t(engine)
Checkin gthe level ......................... 324
Display message (12-button mul-
tifunctio nsteering wheel) ..............270
Display message (4-button multi-
function steering wheel) ................268
Notes ............................................. 383
Temperature display (12-button
multifunctio nsteering wheel;
AMG )............................................. 245
Temperature gauge (12-button
multifunction steering wheel) ........226
Temperature gauge (4-button
multifunctio nsteering wheel) ........222
Warning lamp ................................. 298
Cooling
see Climate control
Cornering lamps
Changing bulbs .............................. 127
Cornering light function
Display message (12-button mul-
tifunctio nsteering wheel) ..............264
Display message (4-button multi-
function steering wheel) ................261
Function/notes ............................. 121
Crash-responsive emergency light-
ing ....................................................... 125
Cruise control Cruise control leve r....................... 178
Deactivating ................................... 180
Display message (12-button mul-
tifunctio nsteering wheel) ..............279
Display message (4-button multi-
function steering wheel) ................272
Driving system ............................... 178
Important safety notes ..................178
LIM indicator lamp .........................178
Selecting ........................................ 179
Setting aspeed .............................. 180
Storing and maintaining current
speed ............................................. 179 8
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

G
WARNING
Modifications to or work performed incor-
rectly on the following parts can result in the
restraint systems not functioning as intended:
R the restraint system, consisting of seat
belts and their anchorage points, beltt en-
sioners, belt force limiters and airbags
R the wiring
R networked electronic systems
Airbags and belt tensioners could fail to
deploy or be triggered in an acciden tdespite
the deceleration force being sufficien tto trig-
ger the systems, or could be triggered unin-
tentionally. For this reason, never make any
modifications to the restraint systems.
Therefore, you must not tamper with elec-
tronic components or their software. SRS (Supplemental Restraint System)
Introduction SRS consists of:
R
the 6 SRS warning lamp
R airbags
R airbag control unit (with crash sensors)
R belt tensioners
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. G
WARNING
If SRS is malfunctioning, individual systems
may be activated unintentionally or may not
be triggered in the event of an accident with
a high rate of vehicle deceleration.
A malfunction has occurred if:
R the 6 SRS warning lamp does not light
up when the ignition is switched on.
R the engine is running and the 6SRS
warning lamp does not go out after a few
seconds.
R the engine is running and the 6SRS
warning lamp lights up again.
In this case, have SRS checked immediately
at a qualified specialist workshop. Mercedes-
Benz recommends that you use a Mercedes-
Benz Service Centre for this purpose.
In particular, work relevant to safety or on
safety-related systems must be carried out at
a qualified specialist workshop.
Triggering of belt tensioners, belt force
limiters and airbags During the first stage of a collision, the airbag
control unit evaluates important physical
data relating to vehicle deceleration or accel-
eration, such as:
R
duration
R direction
R magnitude
Based on the evaluation of this data, the air-
bag control unit pre-emptively triggers the
belt tensioners in the first stage.
i The front belt tensioners can only be trig-
gered if the seat belt tongues on the front
seats are correctly engaged in the seat belt
buckles.
If there is an even higher rate of vehicle decel-
eration or acceleration in a longitudinal direc-
tion, the front airbags are also deployed.
Your vehicle has adaptive, two-stage front air-
bags. The airbag control unit evaluates vehi-
cle deceleration or acceleration in the event Occupant safety
47Safety Z

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

Manual interior lighting control
X
To switch the front interior lighting on/
off: press the cbutton.
X To switch the rear interior lighting on/
off: press the ubutton.
X To switch the reading lamps on/off:
press the pbutton. Crash-responsive emergency lighting
The interior lighting is activated automatically
if the vehicle is involved in an accident.
X To switch off the crash-responsive
emergency lighting: press the hazard
warning lamp button.
or
X Lock and then unlock the vehicle using the
key. Changing bulbs
Important safety notes
Xenon bulbs If yourv
ehicle is equipped with xenon bulbs,
you can recognise this by the following: the
cone of light from the xenon bulbs moves
from the top to the bottom and back again
when you start the engine. For this to be
observed, the lights must be switched on
before starting the engine. G
DANGER
Xenon bulbs carry a high voltage. You could
get an electric shock and be seriously or even
fatally injured if you touch the electric con-
tacts on xenon bulbs. Therefore, never
remove the cover from xenon bulbs.
Do not change xenon bulbs yourself, but have
them replaced at a qualified specialist work-
shop which has the necessary specialist
knowledge and tools to carry out the work
required. Mercedes-Benz recommends that you use a
Mercedes-Benz Service Centre for this pur-
pose. In particular, work relevant to safety or
on safety-related systems must be carried out
at a qualified specialist workshop.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly.
Other bulbs There are bulbs other than the xenon bulbs
that you cannot replace. Replace only the
bulbs listed (Y
page 126). Have the bulbs that
you cannot replace yourself changed at a
qualified specialist workshop.
Mercedes-Benzr ecommends that you use a
Mercedes-Benz Service Centre for this pur-
pose. In particular, work relevant to safety or
on safety-related systems must be carried out
at a qualified specialist workshop.
If you require assistance changing bulbs, con-
sult a qualified specialist workshop.
Do not touch the glass tube of new bulbs with
your bare hands. Even minor contamination
can burn into the glass surface and reduce
the service life of the bulbs. Always use a lint-
free cloth or only touch the base of the bulb
when fitting.
Only use bulbs of the correct type.
If the new bulb still does not light up, consult
a qualified specialist workshop.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly. G
WARNING
Bulbs and lights can become very hot. For this
reason, allow them to cool down before
changing them. Otherwise, you could burn
yourself when you touch them.
Keep bulbs out of the reach of children .Oth-
erwise, they could damage them, for example,
and injure themselves. Changing bulbs
125Lights andwindscreen wipers
Z

X
Make sure that wiper blade ;is seated
correctly.
X Position wiper blade ;parallel to wiper
arm :.
X Fold wiper arm :back onto the rear win-
dow. Problems with the windscreen wipers
The windscreen wipers are obstructed Leaves or snow, for example, may be
obstructing the windscreen wiper movement.
The wiper motor has been deactivated.
X For safety reasons, you should remove the
key from the ignition lock.
or
X Switch off the engine using the Start/Stop
button and open the driver's door.
X Remove the cause of the obstruction.
X Switch the windscreen wipers back on.
The windscreen wipers are inoperative The windscreen wiper drive is malfunctioning.
X
Select another wiper speed on the combi-
nation switch.
X Have the windscreen wipers checked at a
qualified specialist workshop.
The spray nozzles are misaligned The windscreen washer fluid from the spray
nozzles no longer hits the centre of the wind-
screen. The spray nozzles are misaligned.
X
Have the spray nozzles adjusted at a quali-
fied specialist workshop. 132
Windscreen wipersLights and windscreen wipers

Problem Possible causes/consequences and
M Solutions
Vehicles with a petrol
engine:
The engine is not run-
ning smoothly and is
misfiring. There is a malfunction in the engine electronics or in a mechanical
component of the engine management system.
X
Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at a qualified specialist
workshop, e.g. a Mercedes-Benz Service Centre.
Otherwise, non-combusted fuel may get into the catalytic con-
verter and damage it. The coolant tempera-
ture display is showing
more than 120 †. The
coolant warning lamp
may also be lit and a
warning tone may
sound. The coolant level is too low. The coolant is too hot and the engine
is no longer being cooled sufficiently.
X
Stop as soon as possible and allow the engine and the coolant
to cool down.
X Check the coolant level (Y page 324). Observe the warning
notes as you do so and top up the coolant if necessary. If the coolant level is correct, the engine radiator fan may be faulty.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X
At coolant temperatures under 120 †, drive on to the nearest
qualified specialist workshop, e.g. to a Mercedes-Benz Service
Centre.
X Avoid heavy loads on the engine as you do so, e.g. driving on
mountain roads and stop-start traffic. Manual transmission
Important safety notes
G
WARNING
The movement of the pedals must not be
impaired in any way. Do not keep any objects
in the driver's footwell. Make sure that floor-
mats or carpets are correctly secured and
that there is sufficient clearance for the ped-
als.
Do not place several floormats on top of one
another. G
WARNING
Do not change down for additional engine
braking on a slippery road surface. This could
cause the drive wheels to lose their grip and
the vehicle could skid. This could cause you to lose control of your vehicle and cause an
accident.
Gear lever
Gear lever
!
Only engage gear when the clutch pedal
is depressed. 160
Manual transmissionDriving and parking

The LIM indicator lamp on the cruise control
lever indicates which system you have selec-
ted:
R LIM indicator lamp off: cruise control is
selected.
R LIM indicator lamp on: variable SPEED-
TRONIC is selected. :
To switch on or to increase the speed
; LIM indicator lamp
= To switch on with the curren tspeed or
with the last stored speed
? To switch on or to reduce the speed
A To switch between cruise control and var-
iable SPEEDTRONIC
B To deactivate cruise control
When you activate cruise control, the stored
speed is shown in the multifunction display
for five seconds. Vehicles with the 4-button
multifunction steering wheel: the stored
speed is then permanently displayed in the
status indicator together with the ¯sym-
bol. Vehicles with the 12-button multifunc-
tion steering wheel: the segments from the
stored speed up to the maximum speed light
up in the multifunction display.
Selecting cruise control X
Check whether LIM indicator lamp ;is off.
If it is off, cruise control is already selected.
If it is not, press the cruise control lever in
the direction of arrow A.
LIM indicator lamp ;in the cruise control
lever goes out. Cruise control is selected. Storing and maintaining the current
speed You can store the curren
tspeed if you are
driving faster than 30 km/h.
X Accelerate the vehicle to the desired
speed.
X Briefly press the cruise control lever
up : or down ?.
X Remove your foot from the accelerator
pedal.
Cruise control is activated. The vehicle
automatically maintains the speed.
i Cruise control may be unable to maintain
the stored speed on uphill gradients. The
stored speed is resumed when the gradient
evens out. Cruise contro lmaintains the
stored speed on downhill gradients by
automatically applying the brakes.
i Vehicles with manual transmission:
R Always drive at adequate, but no texces-
sive, engine speeds.
R Change gear in good time.
R If possible, do not change down several
gears at a time.
Storing the curren tspee dorc alling up
the last stored speed G
WARNING
Only call up a stored spee difyou know what
that speed is and if it is suitable for the current
traffic and driving situation. You can other-
wise endanger yourself or others by uninten-
tionally triggering sudden acceleration or
braking.
X Briefly pull the cruise control lever towards
you =.
X Remove your foot from the accelerator
pedal.
The first time cruise control is activated, it
stores the current speed or regulates the
speed of the vehicle to the previously
stored speed. Driving systems
179Driving and parking Z

G
WARNING
Never depress the brake peda lcontinuously
while the vehicle is in motion, e.g. never cause
the brakes to rub by applying constant slight
pedal pressure. This causes the brake system
to overheat, increases the braking distance
and can lead to the brakes failing completely. G
WARNING
Do not change down for additional engine
braking on a slippery road surface. This could
cause the drive wheels to lose their grip and
the vehicle could skid.
You can set a variable or permanent limit
speed:
R variable for speed limits, e.g. in built-up
areas
R permanent for long-term speed restric-
tions, e.g. when driving with winter tyres
fitted (Y page 183) G
WARNING
Speedtronic is only an aid designed to assist
driving. You are responsible for the vehicle's
speed and for braking in good time.
i The speed indicated in the speedometer
may differ slightly from the limit speed
stored.
Variable SPEEDTRONIC General notes
With the cruise control lever, you can operate
cruise control or DISTRONIC PLUS and vari-
able SPEEDTRONIC.
The LIM indicator lamp on the cruise control
lever indicates which system you have selec-
ted:
R LIM indicator lamp off: cruise control or
DISTRONIC PLUS is selected.
R LIM indicator lamp on: variable SPEED-
TRONIC is selected. You can use the cruise control lever to limit
the speed to any speed above 30 km/hw
hile
the engine is running. :
To store the current speed or a higher
speed
; LIM indicator lamp
= To store the current speed or to call up
the last stored speed
? To store the current speed or a lower
speed
A To switch between cruise control and var-
iable SPEEDTRONIC
B To deactivate variable SPEEDTRONIC
Selecting variable SPEEDTRONIC
X Check whether LIM indicator lamp ;is on.
If it is on, variable SPEEDTRONIC is already
selected.
If it is not, press the cruise control lever in
the direction of arrow A.
LIM indicator lamp ;in the cruise control
lever lights up. Variable SPEEDTRONIC is
selected. G
WARNING
If there is a change of drivers, advise the new
driver of the limit speed stored.
Only use variable SPEEDTRONIC if you will not
have to accelerate suddenly to a speed above
that stored as the limit speed. You could oth-
erwise cause an accident. Driving systems
181Driving and parking
Z

Display messages Possible causes/consequences and
M Solutions
J
Brake immediately A malfunction has occurred while the HOLD function is active.
or
Vehicles wit
hmanual transmission: with the HOLD function
activated, you have:
R opened the driver's door and released the sea tbelt or
R switched off the engine or
R opened the bonnet
At one may also sound at regular intervals. The tone becomes
louder if you attempt to lock the vehicle.
You cannot start the engine.
X Paying attention to the traffic situation, immediately depress the
brake pedal firmly and hold until the display message disap-
pears.
X Prevent the vehicle from rolling away before you leave it
(Y page 342).
You can restart the engine. J
Check brake fluid
level G
Risk of accident
There is insufficien tbrake fluid in the brake fluid reservoir. In addi-
tion, the red Jwarning lamp lights up in the instrument cluster
and a warning tone sounds.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Apply the parking brake.
X Consult a qualified specialist workshop.
X Do not top up the brake fluid. This does not correct the error. #
Check brake wear The brake pads/linings have reached their wearl
imit.
X Visit a qualified specialist workshop. PRE-SAFE
inoperative G
Risk of injury
Important function sof PRE-SAFE ®
have failed .All other occupant
safety systems, e.g. airbags, remain available.
X Visit a qualified specialist workshop. ü If the symbol appears in the multifunction display,
aseat belt
tongue has been clipped into a rear seat belt buckle.
For further information on the status indicator for the rear seat
belts: (Y page 56). 252
Display messagesOn-board computer and displays