2017 MERCEDES-BENZ C-Class COUPE brake sensor

Ifac ourse-correcting brake application occurs,
red warning lamp :flashe sinthe exterior mir-
ror and adualw arning tone sounds. In addition,
display ;underlining the danger of aside col-
lision appears in the multifunction display.
In very rare cases, the system may make an
inappropriate brake application. Acourse-cor-
recting brake application may be interrupted at
any time if you steer slightly in the opposite
direction or accelerate.
The course-correcting brake application is avail-
abl eint he speed range between 20 mph
(30 km/h) and 120 mph (200 km/h).
Either no braking application, or acourse-cor-
recting brake application adapted to the driving
situation occurs if:
Rthere are vehiclesoro bstacles,e.g. crash
barriers, located on both sides of you rvehicle.
Rav ehicle approaches you too closely at the
side.
Ryou have adopted asporty driving style with
high cornering speeds.
Ryou clearl ybrake or accelerate.
Rad riving safety system intervenes, e.g. ESP®
or PRE-SAFE®Brake.
RESP®is switched off.
Raloss of tire pressure or adefective tire is
detected.
Switching on Activ eBlind Spot Assist
XMake sure that Active Blind Spot Assist is
activated in the on-board computer
(
Ypage 213).
XTurn the SmartKey to position 2in the ignition
lock.
Warning lamps :in the exterior mirrors light
up red for approximately 1.5 seconds .Gray
rada rwave spropagating backwards appear
next to the vehicle in the assistance display in
the multifunction display.
Active Lane Keeping Assist
General notes
Active Lane Keeping Assist monitors the area in
front of you rvehicle by means of multifunction
camera :at the top of the windshield. Various
different area stothe front, rear and side of your
vehicle are also monitored with the aid of the
rada rsensor system. Active Lane Keeping
Assist detects lane markings on the road and
can warn you before you leave you rlane unin-
tentionally .Ifyou do not react to the warning, a
lane-correcting application of the brakes can
bring the vehicle back into the originall ane.
Important safety notes
If you fail to adapt yourdriving style, Active Lane
Keeping Assist can neither reduce the risk of
accident nor override the law sofphysics. Active
Lane Keeping Assist cannot take account of
road and weather conditions. It may not recog-
nize traffic situations. Active Lane Keeping
Assist is only an aid .You are responsible for the
distance to the vehicle in front, for vehicle
speed,f or braking in good time and for staying in
you rlane.
Active Lane Keeping Assist cannot continuously
keep you rvehicle in its lane.
GWARNING
Active Lane Keeping Assist cannot always
clearl ydetect lane markings.
In such cases, Active Lane Keeping Assist
can:
Rgive an unnecessary warning and then
make acourse-correcting brake application
to the vehicle
Rnot give awarning or intervene
There is arisk of an accident.
Driving systems197
Driving and parking
Z

Alwayspayparticula rattentio ntothe traffic
situatio nand kee pwithint he lane, especially
if Active Lane Keeping Assist alerts you. Ter-
minate the interventio ninanon-critica ldriv-
ing situation.
The system maybei mpaired or maynot function
if:
Rther eisp oorvisibility ,e.g.d ue to insufficient
illuminatio nofthe road, or du etosnow,rain,
fog or spray
Rther eisg lare,e.g.f rom oncoming traffic, the
sunorr eflections (e.g. when the roa dsurface
is wet)
Rthe windshield is dirty,f ogged up,damag ed or
covered ,for instance by asticker, in the vicin-
ity of the camera
Rthe rada rsensors in the front or rea rbum pers
or the radiato rtrim ar edirty,e .g.o bscured by
snow
Rther eareno, severa lorunclea rlan em arkings
for alan e, e.g .inareas with roa dconstruction
work
Rthe lane marking sareworn away ,darkorc ov-
ere dup,e.g .byd irtors now
Rthe distance to the vehicl einfront is too small
and the lane marking sthusc annotbed etec-
ted
Rthe lane marking schange quickly, e.g .lan es
branch off, cros sone another or merge
Rthe roa disnarrow and winding
Rtherearestrong shadows cas tonthe road
If no vehicl eisdetectedint he adjacent lane and
broken lane marking saredete
cted, no lane-cor-
recting brake applicatio nism ade.
Warning vibration in the steering wheel
Aw arning maybeg iven if afront whee lpasses
ove ralanem arking .Itw illw arny ou by means of
intermittent vibratio ninthe steering whee lfor
up to 1.5 seconds.
Lane -correcting brake application
If you leave you rlane, unde rcertai ncircumstan-
ces the vehicle will brake briefly on one side.
Thisism eant to assist you in bringing the vehicle
back to the original lane.
GWARNING
Al ane-correcting brake application cannot
always bring the vehicle back into the original lane. Thereisar isk of an accident.
Always steer, brake or accelerate yourself,
especially if Active Lane Keeping Assis twarns
you or makes alane-correcting brake appli-
cation.
If al ane-correcting brake application occurs,
display :appear sinthe multifunction display.
The brake application also slightly reduces vehi-
cle speed.
Thisf unctio nisavailable in the range between
40 mph and 120 mph (60 km/h and 200 km/h).
Al ane-correcting brake application can be made
after driving over alanem arking detected as
being solid or broken. Before this, awarning
must be give nbym eans of intermittent vibration
in the steering wheel. In addition, alanew ith
lane markings on both sides must be recog-
nized.
In the case of abroken lane marking being
detected,al ane-correcting brake application
can only be mad eifavehicle has beend etected
in the adjacent lane. Oncoming vehicles ,over-
taking vehicles and vehicles in adjacent lanes
can be detected.
iAf urthe rlane-correcting brake application
can only occur after you rvehicle has returned
to the original lane.
No lane-correcting brake application occurs if:
Ryou clearly and actively steer, brake or accel- erate.
Ryou cut the corner on asharp bend.
Ryou have switched on the turn signal.
Rad riving safety system intervenes, e.g. ESP®,
PRE-SAFE®Brake or Active Blind Spot Assist.
198Driving systems
Drivin gand parking

Display messagesPossible causes/consequences andMSolutions
The yellow!warning lamp lights up and th ered F (USAonly)
or ! (Canada only) indicator lamp flashes .
It is no tpossibl etoapply th eelectric parking brak emanually.
XShift th etransmission to position P.
XVisitaqualified specialist workshop .
$(USA
only)
J(C anada
only)
Check Brake Fluid
Level
There is no tenough brak efluidint hebrak efluid reservoir .
In addition ,the $ (USAonly) or J (Canada only) warning lamp
lights up in th einstrumen tcluste rand aw arning tone sounds.
GWARNIN G
The braking effec tmay be impaired.
There is ariskofana ccident.
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions. Do no tcontinue driving
under any circumstances.
XSecur ethe vehicl eagainst rollin gaway (Ypage 152).
XConsult aqualified specialist workshop .
XDo notadd brak efluid .This does no tcorrect them alfunction .
#
CheckBrakePadWear
The brak epads/linings hav ereached their wear limit.
US Ao nly: th e$ red brak esystem warning lamp is lit while th e
engin eisrunning.
XVisit aqualified specialist workshop .
G
Inoperative
Oneorm orem ain features of th embrace system are malfunctioning .
XVisitaqualified specialist workshop .
Collision Preven‐tionAssist Plu sCurrently Unavaila‐ble See Operator' sManual
COLLISION PREVENTION ASSIST PLU Sistemporarily no toperational.
Possibl ecauses are:
Rther adar sensor system is temporarily inoperative, e.g. due to elec -
tromagneti cradiation emitted by nearby TV or radi ostation sor
other source sofelectromagneti cradiation .
Rthes ystem is outside th eoperating temperature range.
Rtheo n-bo ardv oltag eistoolow.
Whe nthe causes state dabov enol onger apply, th edisplay message
disappears.
COLLISION PREVENTION ASSIST PLU Sisoperational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 152).
XRestart th eengine.
Display messages22 5
On-boardc omputer andd isplays
Z

Display messagesPossible causes/consequences andMSolutions
Collision Preven‐tionAssist Plu sInoperative
COLLISION PREVENTION ASSIST PLU Sistemporarily inoperative due
to am alfunction .Adaptive Brake Assis tmay also hav efailed.
XVisit aqualified specialist workshop immediately.
PRE-SAFE Inopera‐tiv eSeeOperator' sManual
Importantfunction sofPRE-SAF E®havefailed. Al lother occupant
safet ysystems ,e.g.a ir bags ,remain available.
XVisit aqualified specialist workshop immediately.
PRE-SAFE FunctionsCurrently Limite dSee Operator'sMan‐ual
PRE ‑SAFE®PLU SorP RE‑SAFE®Brake is temporarily inoperative.
Possibl ecauses are:
Rfunction is impaire ddue to heav yrain or snow.
Rther adar sensor system is temporarily inoperative, e.g. due to elec -
tromagneti cradiation emitted by nearby TV or radi ostation sor
other source sofelectromagneti cradiation .
RMercedes-AMG vehicles: ES P®is deactivated
Rthes ystem is outside th eoperating temperature range.
Rtheo n-bo ardv oltag eistoolow.
Whe nthe causes state dabov enol onger apply, th edisplay message
disappears.
PRE ‑SAFE
®PLU Sand PRE ‑SAFE®Brake are operational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 152).
XRestart th eengine.
XMercedes-AMG vehicles: switch ES P®on again(Ypage 68).
PRE-SAFE FunctionsLimitedSee Opera‐tor's Manual
PRE ‑SAFE®PLU SorP RE‑SAFE®Brake is unavailable due to amal-
function .BAS PLU SwithC ross-Traffic Assis tmay also hav efailed.
XVisit aqualified specialist workshop immediately.
226Display messages
On-boardc omputer andd isplays

Display messagesPossible causes/consequences andMSolutions
RadarSensorsDirtySee Operator' sMan‐ual
At least on eofthefollowin gdrivin gsystems or drivin gsafet ysystems
is temporarily restricted or inoperative:
RPRE-SAF E®PLUS
RPRE-SAF E®Brake
RCOLLISION PREVENTION ASSIST PLU S
RActive LaneKeepin gAssist
RActive Blind Spot Assis t
RDISTRONICPLUSw ithS teering Assis tand Stop&Go Pilo t
If th eradar sensor system in fron tisdirty, Active Blind Spot Assis twill
no tp erfor mac ourse-correcting brak eapplication .
Possibl ecauses are:
Rthes ensor sintheradiato rtrima nd/o rinthebumpers are dirty
Rthef unction of th edrivin gsystem or drivin gsafet ysystem is
impaire ddue to heav yrain or snow
Aw arning tone also sounds.
Whe nthe causes state dabov enol onger apply, th edisplay message
disappears. Al ldrivin gsystems or drivin gsafet ysystems are operative
again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 152).
XSwitc hoff th eengine.
XClean th esensor sinthefollowin glocation s(Ypage 296):
Rin theradiato rtrim
Rin th efront bumper
Rin therear bumper, particularly in th emiddle of th erear bumper
XRestart th eengine.
The display message disappears.
6
SRSMalfunctionSer ‐viceRequired
The restrain tsystem is faulty. The 6warning lamp also lights up in
th ei nstrumen tcluster.
GWARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th eevent of an accident, may no tbetriggered .
There is an increased ris kofinjury.
XVisit aqualified specialist workshop immediately.
Fo rfurther information about th erestrain tsystem, see (
Ypage 41).
Display messages227
On-boardc omputer andd isplays
Z

Display messagesPossible causes/consequences andMSolutions
DISTRONIC PLUSNowAvailableDISTRONI CPLUSiso perational again after having been temporarily
unavailable .You can no wreactivat eDISTR ONICPLUS(Ypage 162).
DISTRONIC PLU SCur‐rently UnavailableSee Operator' sMan‐ual
DISTRONI CPLUSist emporarily inoperative.
Steering Assis tand Stop&Go Pilo tare temporarily inoperative.
Possibl ecauses are:
Rther adar sensor system is temporarily inoperative, e.g. due to elec -
tromagneti cradiation emitted by nearby TV or radi ostation sor
other source sofelectromagneti cradiation .
Rthes ystem is outside th eoperating temperature range.
Rtheo n-bo ardv oltag eistoolow.
Aw arning tone also sounds.
Whe nthe causes state dabov enol onger apply, th edisplay message
disappears.
DISTRONI CPLUSiso perational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 152).
XRestart th eengine.
DISTRONICPLU SInop‐erativ eDISTRONI CPLUSisd efective.
The followin gmay hav ealso failed:
RBASP LUSw ithC ross-Traffic Assis t
RPRE-SAFE®Brake
RSteering Assis tand Stop&Go Pilo t
Aw arning tone also sounds.
XVisit aqualified specialist workshop .
DISTRONIC PLUSSus‐pendedYou hav edepressed th eaccelerato rpedal .DISTR ONICPLUSisn o
longer controllin gthe speed of th evehicle.
XRemove your foo tfromt heaccelerato rpedal .
DISTRONIC PLU S---mphAn activation condition for DISTRONI CPLUSisn otfulfilled .
XCheckthe activation condition sfor DISTRONI CPLUS(Ypage 162).
Display messages23 9
On-boardc omputer andd isplays
Z

Display messagesPossible causes/consequences andMSolutions
TirePressure Moni‐tor Inoperative NoWheel Sensor s
The wheels mounte ddonothav eas uitable tire pressur esensor .The
tire pressur emonitor is deactivated.
XMoun twheels wit hsuitable tire pressur esensors.
The tire pressur emonitor is activated automatically after drivin gfor
af ew minutes.
Tir ePress.Monito rInoperativeThe tire pressur emonitor is faulty.
XVisit aqualified specialist workshop .
Vehicle
Display messagesPossible causes/consequences and MSolutions
Shiftto'P'or'N'to Start EngineYou haveattempte dtostart th eenginew itht he transmission in posi-
tion Ror D.
XShift th etransmission to position Por N.
Apply Brake toShift fro m'P'You hav eattempte dtomovet he transmission selector lever to posi-
tion D,Ror Nwithout depressing th ebrak epedal .
XDepress th ebrak epedal .
ToDeselect PorN,DepressBrake andStart Engine
Withthe engin eswitched off ,you hav eattempte dtoshift th etrans -
mission out of position Por Nint oa nother transmission position .
XDepress thebrak epedal .
XStart th eengine.
TransmissionNotinPR iskofV ehicleRollin gAway
The driver's door is open or no tfully closed and th etransmission is in
position R,N or D.
Aw arning tone also sounds.
GWARNIN G
The vehicl emay rol laway.
There is ariskofana ccident.
XShift thetransmission to position P.
XSecurethe vehicl eagainst rollin gaway (Ypage 152).
XClosethe driver's door completely.
Onl yShift to 'P'whenVehicl eisSta‐tionar y
The vehicl eismoving.
XPull ove rand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XShift th etransmission to position P.
Display messages243
On-boardc omputer andd isplays
Z