sensor MERCEDES-BENZ E-CLASS CABRIOLET 2011 Service Manual

Display messages Possible causes/consequences and
M Solutions
PRE-SAFE
Functions cur‐
rently limited See
Owner'
sManual G
Risk of accident
PRE-SAFE ®
Brake is temporarily inoperative if:
R theD ISTR ONIC PLU Scover in th eradiato rgrille is dirty.
R thes ensor sinthebumpers are dirty.
R itsf unction is impaire ddue to heav yrain or snow.
R ther ada rsensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tion soro ther sources of electromagnetic radiation.
R the system is outside the operatin gtemperature range.
R the on-board voltage is too low.
PRE-SAFE ®
Brak eiso perational 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 sensor sare fully available again.
R the system is within the operatin gtemperature range.
If the display message continues to be displayed:
X Clean the DISTRONIC PLUS cover in the radiator grille
(Y page 290).
X Clean the bumpers (Y page 290).
X Restart the engine.
X Wait until the batter yissufficiently charged. PRE-SAFE
Functions limited
See Owner's Manual G
Risk of accident
PRE-SAFE ®
Brak eisf aulty. BASP LUS or the distance warning sig-
nal may also have failed.
X Visit aqualified specialist workshop. A
Malfunction Con‐
sult workshop G
Risk of injury
Cabriolet: the roll bars are defective.
X Visit aqualified specialist workshop immediately. ü If the symbola
ppears in the multifunction display,as eat belt
tongue has been clipped intoar ear seat belt buckle.
For further information on the status indicator for the rear seat
belts: (Y page 49). 236
Display messagesOn-boar
dcomputer and displays

Display messages Possible causes/consequences and
M Solutions
ý G
Risk of injury
If th esymbol appears in th emultifunction display, aseat belt
tongue has not been clipped intoar ear seat belt buckle.
X If necessary, ask the occupants in the rear to fasten their seat
belts.
For further information on the status indicator for the rear seat
belts: (Y page 49). Child seat in
wrong position
See Owner's Manual G
Risk of injury
Vehicles with automatic child seat recognition on the front-
passenger seat: the child seat is positioned incorrectly.
X Fit the child seat in the correct position. G
Risk of injury
Vehicles with automatic child seat recognition on the front-
passenger seat: the automatic child seat recognition sensor is
faulty.
X Visit aqualified specialist workshop. 6
Restraint
sys. mal‐
functio
nConsult workshop G
Risk of injury
There is amalfunction in the SRS (Supplemental Restraint Sys-
tem). The 6warning lamp also lights up in the instrument clus-
ter.
X Visit aqualified specialist workshop. 6
Front
left malfunc‐
tion Consult work‐
shop or
Front right malfunction
Consult workshop G
Risk of injury
SRS has malfunctioned at the fron tonthe left or right. The 6
warning lamp also lights up in the instrument cluster.
X Visit aqualified specialist workshop. Display messages
237On-boardcomputer and displays Z

Display messages Possible causes/consequences and
M Solutions
b
Intell
.Light Sys‐ tem inoperative The Intelligent Light Syste
misfaulty. The lights remain available
without the Intelligent Light System.
X Visit aqualified specialist workshop. b
Malfunction See
Owner's Manual The exterior lighting is faulty.
X
Visit aqualified specialist workshop. Vehicles with trailer tow hitch:
afuse may have blown.
X Check the fuses (Y page 313).
X If necessary, replace the blown fuse. Observe the warning notes
as you do so.
If the displaym essage continues to be displayed:
X Visit aqualified specialist workshop. b
AUTO
lights inoper‐
ative The light sensor is faulty.
X
Visit aqualified specialist workshop. b
Switch off lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to Ã.Adaptive Main-beam
Assist inoperative Adaptive Highbeam Assist is faulty.
X
Visit aqualified specialist workshop. Adaptive Main-beam
Assist currently
unavailable See
Owner's Manual Adaptive Highbeam Assist is deactivated and temporarily inoper-
ative if:
R
the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, snow or fog.
X Cleant he windscreen.
Adaptive Highbeam Assist is available again if:
R the dirt (e.g. slush) drops away while the vehicle is in motion.
R the system detectst hat the camera is fully operational again.
The Adaptive Main-beam Assist available again message
is displayed. Display messages
241On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
Radar sensor
deactivated autom.
See Owner'
sManual Vehicles wit
hanavigation system: th evehicl eisc lose to aradio
telescope facilit yand is therefore prohibite dfromt ransmitting any
rada rsignals .The radar sensor system has switched off automat-
ically (Y page 345).
DISTRONIC PLUS (Y page 171) is deactivated automatically if it is
activated. Awarning tone also sounds.
Blin dSpotA ssist (Y page 196) or Active Blind Spot Assist
(Y page 199) is deactivated automaticallyifitisa ctivated. The
yellow 9indicator lamps also light up in the exterior mirrors.
BAS PLUS (Brake Assist PLUS) (Y page 62) and PRE-SAFE®
Brake
(Y page 66) are also not available.
X Drive on.
Once you have moved far enough awayf rom the radio telescope,
the above functionsa re available again.Radar sensor
deactivated See
Owner's Manual The radar sensor system is deactivated.
X
Check whether or not the radar sensor system may be activated
(Y page 345).
X Switch on the radar sensor system (Y page 229).Lane Keeping
Assist currently
unavailable See
Owner's Manual or
Active Lane Keep‐ ing Assist cur‐
rently unavailable
See Owner's Manual Lane Keeping Assist or Active Lane Keeping 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.
R there are no lane markings for alonger period.
R the lane markings are worn, dark or covered, for example by dirt
or snow.
Lane Keeping Assist or Active Lane Keeping Assist is operational
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 camera is fully operational again.
If the displaym essage continues to be displayed:
X Cleant he windscreen. Lane Keeping
Assist inoperative
or
Active Lane Keeping Assist
inoperative Lane Keeping Assist or Active Lane Keeping Assist is faulty.
X
Visit aqualified specialist workshop. Display messages
245On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
Blind Spo
tAssist currently unavail‐
abl
eS ee Owner's Manual or
Active Blind Spo
tAssist currently unavail‐
abl
eS ee Owner's Manual Blind Spot Assis
torActive Blind Spot Assist is temporaril yinop-
erative if:
R yo uh avee stablished the electrical connection between the
traile rand your vehicle.
R the sensors ar edirty.
R its functio nisimpaired due to heavy rain or snow.
R the radar sensor system is outside the operating temperature
range.
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.
The yellow 9indicator lamps also light up in the exterior mir-
rors.
Blind Spot Assist or Active Blind Spot Assist is operational again
and the displaym essage disappears if:
R the dirt (e.g. slush) drops awayw hile the vehicle is in motion.
R the system detects that the sensors are fully available again.
R the radar sensor system is back within the operating tempera-
ture range.
If the displaym essage continues to be displayed:
X Cleant he sensors (Y page 290).
X Restart the engine. Blind Spot Assist
inoperative or
Active Blind Spot Assist inoperative Blind Spot Assist or Active Blind Spot Assist is faulty.
The yellow
9indicator lamps also light up in the exterior mir-
rors.
X Visit aqualified specialist workshop. Parking Guidance
inoperative Parking Guidance is malfunctionin
g(Ypage 189).
X Restart the engine.
If the displaym essage continues to be displayed:
X Visit aqualified specialist workshop. 246
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
Parkin
gGuidance cancelled Parking Guidance has been deactivated because:
R
thev ehicl eiss kidding.
R thes ensor sare dirty.
R am alfunction has occurred.
Aw arning tone also sounds.
X Reactivat eParking Guidance late r(Y page 189).
If the parkin gspace symbol does not appear in the multifunction
display at speeds below 30 km/h:
X Clean the sensors (Y page 290).
X Restart the engine.
If the parkin gspace symbol still does not appear in the multifunc-
tion display at speeds below 30 km/h:
X Visit aqualified specialist workshop. Parkin
gGuidance has been deactivated because you are no longer
following the recommended path.
X Park again and, while doing so, observe the display messages
in the multifunction display. Parkin
gGuidance finished The vehicle is parked.
Awarning tone also sounds.
The display message disappears automatically. DISTRONIC PLUS
off DISTRONI
CPLUSh as been deactivate d(Ypage 171). If it was
deactivate dautomatically, awarning tone also sounds. DISTRONIC PLUS
available again DISTRONI
CPLUSiso perational againa fter having been tempo-
rarily unavailable .You can now reactivat eDISTRONIC PLUS
(Y page 171). Display messages
247On-board computer and displays Z

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

Engine
Problem Possible causes/consequences and
M Solutions
;
The yellow engin
ediag-
nostics warning lamp
light supw hile the
engin eisrunning. Ther
emay be afault ,for example:
R in th eenginem anagement
R in th efuel injection system
R in th eexhaust system
R in th eignition system (for vehicle swith petrol engines)
R in th efuel system
The emission limit values may be exceeded and th eenginem ay
be runnin ginemergenc ymode.
X Hav ethe vehicle checked as soon as possible at aqualified
specialist workshop. Vehicle
swithad ieseleng ine: th efuel tan khas been run dry
(Y page 164).
X Start th eenginet hree to four times after refuelling.
If th eyellow engin ediagnostics warning lamp goes out ,emer-
gency runnin gmodeisc ancelled. The vehicle need no tbe
checked. 8
The yellow reserve fuel
warning lamp lights up
whil
ethe engine is run-
ning. The fue
llev el ha sdroppe dinto the reserve range.
Operation of the auxiliary heating is deactivated when the fue llev el
drops into the reserve range.
X Refue latthe nearest filling station. ?
The red coolant warn-
ing lamp lights up while
the engine is running
and the coolant tem-
perature gaug
eisatthe
star toft he scale. The temperature sensor for the coolant temperature gauge is
faulty.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
X
Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine. Do not continue driving
under any circumstances.
X Apply the parking brake.
X Consult aqualified specialist workshop. 260
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

If the coolant level is approximately 1.5 cm
above marker bar =in the filler neck when
warm, there is enough coolant in coolant
expansio ntank ;.
X If necessary, to pupwithc oolan tthat has
been tested and approved by Mercedes-
Benz.
X Replace cap :and turn it clockwise as far
as it will go.
For further information on coolant, see
(Y page 337).
Windscreen washer system and head-
lamp cleanings ystemThe washer fluid reservoir is used for both the
windscreen washer system and the headlamp
cleaning system.
i
Components and service products must
be matched. Mercedes-Ben zrecommends
that you use products tested and approved
by Mercedes-Benz. They are listed in this
Mercedes-Ben zOwner's Manual in the
appropriat esection.
You can identif yservice product sapproved
by Mercedes-Ben zbythe followin ginscrip-
tions on the container:
R MB-Freigabe (e.g. MB-Freigabe 371.0)
R MB-Approval (e.g. MB-Approval 371.0)
Other labels and recommendations that
make reference to quality level or aspeci-
fication according to an MB Sheet no. (e.g.
MB 371.0) are not necessarily approved by
Mercedes-Benz.
You can obtain further information from
any Mercedes-Benz Servic eCentre. G
WARNING
Windscreen washer fluid is highly flammable.
Fire, naked flames and smokin gare prohibi-
ted when handling washer fluid concentrate.
! Only use washer fluid concentrate which
is suitable for plastic lamp lenses. Unsuit-
able washer fluid concentrate could dam- age the plastic lamp lenses of the head-
lamps.
! Do not use distilled or de-ionised water in
the washer fluid reservoir. Otherwise, the
level sensor may be damaged.
i Add windscreen washer concentrate, e.g.
MB SummerFit, to the washer fluid all year
round. Example: washer fluid reservoir
X
Mix the windscreen washer fluid in acon-
tainer beforehand.
X At temperatures above freezing: fill the
washer fluid reservoir with amix of water
and windscreen washer concentrate (e.g.
MB SummerFit).
X At temperatures below freezing: fill the
washer fluid reservoir with amix of water
and windscreen washer concentrate (e.g.
MB WinterFit). Adapt the mixing ratio to the
outside temperatures.
X To open: pull cap:upwards by the tab.
X Top up with the premixed washer fluid.
X To close: press cap :ontothe filler neck
until it engages. Maintenance
ASSYST PLUS service interval display
Service messages Information on the type of service and service
intervals (see separat
eServic eBooklet). 284
MaintenanceMaintenance and care

Cleaning th
ewiper blades G
WARNING
Switch off th ewindscree nwipers and remove
the key fro mthe ignition lock before cleaning
the windscreen or the wiper blades. On vehi-
cles with KEYLESS-GO, press the Start/Stop
button repeatedly until all indicator lamps in
the instrument cluster have gone off. The
windscreen wipers could otherwise move and
injure you.
! Do not pull on the wiper blade. Otherwise,
the wiper blade could be damaged.
! Do not clean wiper blades too often and
do not rub them too hard. Otherwise, the
graphite coating could be damaged. This
could cause wiper noise.
X Fold the wiper arms away from the wind-
screen.
X Cleant he wiper blades carefully using a
damp cloth.
X Fold the windscreen wipers back again
before switching on the ignition.
! Hold the wiper arm securely when folding
back. The windscreen could be damaged if
the wiper arm hits against it suddenly.
Cleaningt he exterior lighting X
Cleant he plastic lenses of the exterior
lighting using awet sponge and amild
cleaning agent, e.g. Mercedes-Ben zcar
shampoo or cleanin gcloths.
! Only use cleanin gagents or cleaning
cloth sthata re suitable for plastic lenses.
Unsuitable cleanin gagents or cleaning
cloth scould scratch or damag ethe plastic
lenses of th eexteri or lighting. Cleaning th
esensors X
Clean sensors :of th edriving systems
wit hw ater, car shampoo and asoftc loth.
! If you clean the sensors with ahigh-pres-
sure cleaner, mak esure that you keep a
distanc eofatl east 30 cm between the
vehicle and the high-pressure cleaner noz-
zle. Information about the correc tdistance
is available fro mthe equipment manufac-
turer.
Cleaningt he reversing camera Example: Coupé
X
Use clear water and asoft cloth to clean
camera lens :.
! Do not clean the camera lens and the area
around the reversing camera with ahigh-
pressure cleaner. 290
CareMaintenance and care