2011 MERCEDES-BENZ E-CLASS COUPE air condition

still detects typical indicators of fatigue or
increasing lapses in concentration, you will be
warned againa fter 15 minutes at the earliest.
ATTENTION ASSIST is reset whe nyou con-
tinue you rjourney and it startsa ssessing your
tiredness again if:
R you switch off the engine.
R you take off your seat belt and open the
driver's door, e.g. for achange of drivers or
to take abreak. Speed Limit Assist
Important safety notes i
Speed Limit Assist is not operational in all
countries.
Speed Limit Assist shows you detected speed
limits in the multifunction display .Data from
th en avigation system is also used for this
purpose. The display appear sifatraffic sign
indicating aspee dlimit or th eend ofas peed
limit is detected. If Speed Limit Assist does
no td etec tany traffic signs, the speed limit
from the digital roa dmap is take nand shown
in the display.
Speed Limit Assist detects the traffic signs
with acamera at the top of the windscreen. :
Speed Limit Assist camera G
WARNING
Speed Limit Assist is only an aid and may
detect speed limit signs incorrectly or not at
all. The system may be impaired or may not func-
tion if:
R
there is poor visibility, e.g. due to snow,
rain, fog or spray.
R there is glare, e.g. from the sun or from
oncoming traffic.
R the windscreen is dirty, misted up or cov-
ered, for instance by asticker, in the vicinity
of the camera.
R the traffic signs are covered, for instance
by dirt, snow or trees.
R the traffic signs are poorly illuminated.
R there are ambiguous traffic signs, for
instance near roadworks or on multi-lane
roads.
Traffic signs always have priority over the
Speed Limit Assist display. Speed Limit Assist
cannot detect road and traffic conditions. It is
not asubstitute for attentive driving.
Always pay attention to traffic conditions and
your surroundings. Otherwise, you may fail to
recognise dangers in time, cause an accident
and injure yourselfa nd others.
Information in the multifunctio ndisplay Example
:vehicles with automatic transmission
: Traffic sign indicatin gaspeed limit or the
end of aspeed limit
; Speed Limit Assist is available and the
warning function is switched on in the on-
board computer
= Unit sused in the traffic sign displayed Driving systems
195Driving and parking Z

the warning onl
yoccurs if the differenc ein
spee dislesst han1 2km/h.
The yellow indicator lamp goes out if reverse
gearise ngaged. Blind Spot Assist is then
deactivated.
The brightness of the indicator/warning
lamps is adjusted automaticallya ccording to
the ambient light. G
WARNING
Blind Spot Assist is not active at speeds below
30 km/h, and the indicator lamps in the exte-
rior mirrors are yellow. Vehicles in the moni-
toring range are then not indicated.
Always pay attention to traffic conditions and
your surroundings. Otherwise, you may fail to
recognise dangers in time, cause an accident
and injure yourselfa nd others.
Collisio nwarning
If av ehicl eisd etected in the monitoring range
of Blind Spo tAssist and you switch on the turn
signal, adoublew arning tone sounds. Red
warning lamp :flashes. If the turn signal
remains on, detected vehicles are indicated
by the flashing of red warning lamp :.There
are no further warning tones.
Switching on Blind Spot Assist
X Make sure that the radar sensor system
(Y page 229) and Blind Spot Assist
(Y page 224) are activated in the on-board
computer.
X Turn the key to position 2in the ignition
lock.
Warning lamps :light up red in the exte-
rior mirrors for approximately 1.5 seconds
and then turn yellow.
Trailer towing
If you attach atrailer, make sure you have
correctly established the electrical connec-
tion. This can be accomplished by checking
the trailer lighting. In this event, Blind Spot
Assist is deactivated. The indicator lamp in
the exterior mirrors lights up yellow, and the
Blind Spot Assist currently unavail‐ able See Owner's Manual message
appears in the multifunction display.
i You can deactivate the indicator lamps in
the exterior mirrors.
To do so, switch off Blind Spot Assist if:
R the key is in position 2in the ignition
lock.
R the engine is not running.
R the electrical connection to the trailer
has been established.
Lane Keeping Assist Important safety notes
Lane Keeping Assist monitors the area in
front of your vehicle by means of
acamera at
the top of the windscreen. Lane Keeping
Assist detectsl ane markings on the road and
warns you before you leave your lane unin-
tentionally.
If you have chosen the (Y page 225) function
in the on-board computer and select km as
the unit of measurement, Active Lane Keep-
ing Assist is active from speeds of 60 km/h.
If the displayu nit is selected, the assistance
range begins at 40 mph. G
WARNING
Lane Keeping Assist does not keep your vehi-
cle in its lane. It is only an aid and may detect
the lane markings on the road incorrectly or
not at all.
The system may be impaired or may not func-
tion if:
R there is poor visibility, e.g. due to insuffi-
cient illumination of the road, or due to
snow, rain, fog or spray.
R there is glare, e.g. from oncomingt raffic,
the sun, or reflection from other vehicles.
R the windscreen is dirty, misted up or cov-
ered, for instancebyas ticker, in the vicinity
of the camera
R several or no lane markings for asingle lane
are present. 198
Driving systemsDriving and parking

R
the lane markings ar eworna way, dark or
covered up ,e.g.byd irtors now.
R the distance to the vehicl einfront is too
small and the lane marking sthu sc anno tbe
detected.
R the lane markings on the road are unclear,
e.g. near roadworks.
R the lane markings chang equickly, e.g.
lanes branc hoff, cros sone another or
merge.
R the road is narro wand winding.
Lane Keeping Assist cannot detec troad and
traffic conditions. It is not asubstitute for
attentive driving .You are responsible for the
vehicle's speed, braking in good time, and
steering correctly. Always adapt your driving
style to suit the prevailing road and weather
conditions. Always pay attention to traffic
conditions and your surroundings. Otherwise,
you may fail to recognise dangers in time,
cause an accident and injure yourself and oth-
ers.
Aw arning may be given if afront wheel
passes over alane marking. It will warn you
by means of intermittentv ibration in the
steering wheel for up to 1.5 seconds.
Activating Lane Keeping Assist
X Symbol :appears in the multifunction
display. Active Driving Assistance package
General notes The Active Drivin
gAssistance package con-
sists of DISTRONIC PLUS (Y page 171), Active
Blind Spot Assist (Y page 199) and Active
Lane Keeping Assist (Y page 202).
Active Blind Spot Assist Important safety notes
Active Blind Spot Assist uses
aradar sensor
system to monitor the side areas of your vehi- cle that are behind the driver.
Awarning dis-
play in th eexteri or mirror sdraws your atten-
tio ntod etected vehicles in the monitored
area. If you then switch on the corresponding
turn signal to change lane, you will also
receive avisual and acoustic collision warn-
ing. If arisk of lateral collision is detected,
corrective braking may help you avoid acol-
lision. To support the course-correcting brake
application, Active Blind Spot Assist also uses
the forward-facin gradar sensor system.
Active Blind Spot Assist provides assistance
at speeds higher than about 30 km/h. G
WARNING
Active Blind Spot Assist is only an aid and may
detect vehicles/obstacles incorrectly or not
at all.
The system may be impaired or may not func-
tion if:
R there is poor visibility, e.g. due to snow,
rain, fog or spray.
R the rear and/or front sensors are dirty.
Active Blind Spot Assist may not detect nar-
row vehicles, such as motorcycles or bicycles,
or only detect them too late. It cannot detect
vehicles which are overtaken at asmall dis-
tancea nd then enter the blind spot area.
Active Blind Spot Assist cannot detect road
and traffic conditions. It is not asubstitute for
attentive driving. You are responsible for the
vehicle's speed, braking in good time, and
steering correctly. Always adapt your driving
style to suit the prevailing road and weather
conditions. Always pay attention to traffic
conditions and your surroundings. Otherwise,
you may fail to recognise dangers in time,
cause an accident and injure yourself and oth-
ers.
The radar sensor system is automatically
deactivated near radio telescope facilities
(Y page 345).
For Active Blind Spot Assist to assist you
when driving, the radar sensor system must
be activated (Y page 229) and operational. Driving systems
199Driving and parking Z

Display messages Possible causes/consequences and
M Solutions
J
Brake immediately Am
alfunction has occurred while th eHOLDf unction or DIS-
TRONIC PLU Sisactive.
or
Vehicles wit hmanual transmission: wit hthe HOLD function acti-
vated, you hav eeither:
R opened th edriver's doo rand released the sea tbelt or
R switched off the engin eor
R opened the bonnet
At one may also sound at regular intervals. The toneb ecomes
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 301).
You can restart the engine. J
Check brake fluid
level G
Risk of accident
There is insufficient brake fluid in the brake fluid reservoir. In addi-
tion, the red Jwarning lamp in the instrument cluster lights
up and awarning tone sounds.
X Pullo ver and stop the vehicl esafel yass oon as possible,p aying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Apply the parking brake.
X Consult aqualified specialist workshop.
X Do not top up the brake fluid. This does not correct the error. #
Check brake wear The brake pads/linings have reache
dtheir wearl imit.
X Visit aqualified specialist workshop. PRE-SAFE
inoperative See
Owner's Man. G
Risk of injury
Important function sofPRE-SAFE ®
have failed .All other occupant
safet ysystems, e.g. airbags, remain available.
X Visit aqualified specialist workshop immediately. Display messages
235On-board computer and displays Z

Engine
Display messages Possible causes/consequences and
M Solutions
+
Top
up coolant See
Owner'
sManual The coolant leve
listoolow.
X Top up th ecoolant ,observing th ewarning note sbefore doing
so (Y page 283).
X If th ecoolant needs toppin gupmoreo ften than usual, have the
engin ecoolant system checked at aqualifie dspecialist work-
shop. ?
Coolan
tStopv ehi‐ cle Switch engine
off The coolant is to
ohot.
Aw arning tone also sounds.
X Stop th evehicle immediately, payin gattentio ntoroad and traf-
fic conditions, and switch off the engine.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by frozen slush.
X Wait until the display message disappears before restarting the
engine. Otherwise, there is arisk of engine damage.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit aqualified specialist
workshop immediately. The poly-V-belt may have torn.
X
Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult aqualified specialist workshop.
If the poly-V-belt is OK:
X Wait until the display message disappears before restarting the
engine. Otherwise, there is arisk of engine damage.
X Pay attention to the coolant temperature display.
X Visit aqualified specialist workshop. ? The fan motor is faulty.
X
If the coolant temperature is less than 120 †, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving on
mountain roads and stop/start driving. 242
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
# The battery is no
tbeing charged.
Aw arning tone also sounds.
Possible causes are:
R af ault yalternator
R at ornp oly-V-belt
R am alfunctio nintheelectronics
X Stop th evehicle immediately, payin gattentio ntoroad and traf-
fic conditions, and switch off the engine.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult aqualified specialist workshop.
If the poly-V-belt is OK:
X Visit aqualified specialist workshop. 4
Check eng. oil
lev. when next
refuelling The engine oil level has dropped to
acritical level.
Aw arning tone also sounds.
X Chec kthe oil level (Y page 282).
X If necessary, top up the engine oil (Y page 283).
X Have the engine checked for leaks if the engine oil needs top-
ping up more often than usual. 8
Reserve fuel level The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated when the fuel level
drops into the reserve range.
X
Refuel at the nearest filling station. C There is only
avery small amount of fuel in the fuel tank.
The auxiliary heating cannot be operated.
X Refuel at the nearest filling station without fail. ¸
Replace
air cleaner Vehicles with
adiesel engine: the engine air filter is dirty and must
be replaced.
X Visit aqualified specialist workshop. !
Clean
the fuel fil‐
ter Vehicles with
adiesel engine: there is water in the fuel filter. The
water must be drained off.
X Visit aqualified specialist workshop. Display messages
243On-board computer and displays Z

Drivin
gsystems Display messages Possible causes/consequences and
M Solutions
À
Attention Assist:
Drowsines
sdetec‐ ted Based on specific criteria, ATTENTION ASSIST has determined that
th
ed river is tired or payin glessa ttenti on.Aw arning tone also
sounds.
X If necessary, tak eabreak.
During lon gjou rneys, tak eregular break singood tim esoyou get
enough rest. À
Attention Assist
inoperative ATTENTION ASSIST has failed.
X
Visi taq ualified specialist workshop. Speed Limit Assist
currently unavail‐
able See Owner's
Manual Speed Limit Assist is deactivated and temporarily inoperative if:
R
the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.
Speed Limit Assist is operational again and the display message
disappears if:
R the dirt (e.g. slush) drops away while the vehicle is in motion.
R the system detects that the camera is fully operational again.
If the display message continues to be displayed:
X Clean the windscreen. Speed Limit Assist:
Unavailable in
this country Speed Limit Assist is only available in certain countries.
X
Driv eon.
Speed Limit Assist is available again when you drive in acountry
in which its use is approved. Speed Limit Assist
inoperative Speed Limit Assist is faulty.
X
Visit aqualified specialist workshop. HOLD
Off The HOLD function is deactivated. The vehicle is skidding.
Aw
arning tone also sounds.
X Reactivat ethe HOLD function late r(Ypage 184). The HOLD function is deactivated. When th
ebrak epedal is firmly
depressed, an activation condition is not fulfilled.
Aw arning tone also sounds.
X Chec kthe activation condition sfor th eHOLDf unction
(Y page 184). 244
Display messagesOn-boar
dcomputer and displays

Display messages Possible causes/consequences and
M Solutions
DISTRONIC PLUS
currently unavail‐
abl
eS ee Owner's Manual DISTRONIC PLU
Sisdeactivated and is temporarily inoperative if:
R the DISTRONIC PLUS cover in the radiator grille is dirty.
R the sensors in the bumpers are dirty.
R the radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or other sources of electromagnetic radiation.
R its function is impaired due to heavy rain or snow.
R the system is outside the operating temperature range.
R the on-board voltage is too low.
Aw arning tone also sounds.
DISTRONI CPLUSiso perational againa nd the display message
disappears if:
R the dirt (e.g. slush) drops away whil ethe vehicl eisinmotion.
R the system detects tha tthe sensors are fully available again.
R the system is within the operating temperature range.
If the displaym essage continues to be displayed:
X Cleant he DISTRONIC PLUS cover in the radiator grille
(Y page 290).
X Cleant he bumpers (Y page 290).
X Restart the engine. DISTRONIC PLUS
inoperative DISTRONIC PLUS is faulty. BAS PLUS and PRE-SAFE
®
Brake may
also have failed.
Aw arning tone also sounds.
X Visi taq ualified specialist workshop. DISTRONIC PLUS
suspended You have depressed the accelerator pedal. DISTRONIC PLUS is no
longer controlling the speed of the vehicle.
X
Take your foot off the accelerator pedal. DISTRONIC PLUS
--- km/h An activation condition for DISTRONIC PLUS is not fulfilled.
X
Check the activation condition sfor DISTRONIC PLUS
(Y page 171). DISTRONIC PLUS and
SPEEDTRONIC
inoperative DISTRONIC PLUS and SPEEDTRONIC are faulty.
Awarning tone
also sounds.
X Visit aqualified specialist workshop. Cruise control and
SPEEDTRONIC
inoperative Cruise contro
land SPEEDTRONIC are malfunctioning.
Aw arning tone also sounds.
X Visi taq ualified specialist workshop. 248
Display messagesOn-boar
dcomputer and displays