2016 MERCEDES-BENZ METRIS brake sensor

If you change wheel size, make sure they corre-
spond to the correct wheel size category
(
Ypage 267). If the category is changed without
recoding the control units in the vehicle,t he
functioning of the distance warning feature may
be impaired. COLLISION PREVENTION ASSIST
may then detect amalfunction and switch itself
off.
Operation
XTo activate/deactivate: activate or deacti-
vate the distance warning function in the on-
board computer (
Ypage 184).
If the distance warning function of the COL-
LISION PREVENTION ASSISTisa ctivated, the
display shows the Äsymbol:
Rin the header
Rin the Status Overviewof the Assist.menu (Ypage 183)
At speedsuptoa pprox20m ph (30 km/h) the
display in vehiclesw ith Active Parking Assist
first shows the ístatus indicator. Only from
as peed of abou t20m ph (30 km/h )does the
display show the Äsymbolinstead of the
í status indicator.
The distance warning function can help you to
minimize the risk of afront-end collision with a
vehicle ahea dorreduce the effects of such a
collision. With the help of the rada rsensor sys-
tem, the distance warning function can detect
obstacles that are in the path of you rvehicle for
an extended period of time. If the distance warn-
ing function detects that there is arisk of acol-
lision, you wil lbewarned visually and, where
necessary ,acoustically.W ithout yourinterven-
tion, the distance warning function cannot pre-
vent acollision.
The distance warning function issues awarning
at speeds:
Rfrom abou t4mph (7 km/h) if you approach a
vehicle traveling in front or astationary vehi-
cle very quickly. The ·warning lamp in the
instrument cluster flashe sand an intermittent
warning tone also sounds.
At speedsuptoa bout45mph (70 km/h), the
system also detects stationary obstacles ,for
example stationary or parked vehicles.
XBrake immediately until the distance to the
obstacle increases and the risk of acollision
has passed.
or
XTake evasive action, provideditiss afe to do
so.
Adaptive Brake Assist
General notes
Adaptive Brake Assist evaluates the traffic sit-
uatio nwith the help of the rada rsensor system
and can detect obstacle swhich have been in
you rvehicle's path for an extended period of
time. From speedsa bove4mph (7 km/h), Adap-
tive Brake Assist aid syou in braking during haz-
ardou ssituations.
Up to aspeed of approximately 125 mph
(200 km/h), Adaptive Brake Assist is capable of
reacting to moving obstacle sthat have already
been detected as such at least once over the
period of observation.
Important safety notes
GWARNING
Adaptive Brake Assist does not react:
Rto peopleora nimals
Rto oncoming vehicles
Rto crossing traffic
Rto stationary obstacles
Rwhen cornering
As aresult, the Adaptive Brake Assist may not
intervene in all critical conditions. There is a
risk of an accident.
Alway spay careful attention to the traffic sit-
uatio nand be ready to brake.
GWARNING
Adaptive Brake Assist cannot always clearly
identify objects and complex traffic situa-
tions.
In such cases, Adaptive Brake Assist can:
Rintervene unnecessarily
Rnot intervene
There is arisk of an accident.
144Driving systems
Driving and parking

Alwayspaycarefu lattentio ntothe traffic sit-
uatio nand be ready to brake. Terminate the
interventio ninanon-critica ldriving situation.
In particular, the detection of obstacle scan be
impaired in the cas eof:
Rdirt on the sensors or anything else covering
the sensors
Rsnow or heavy rain
Rinterference from othe rradar sources
Rstrong rada rreflections, for example, in park-
ing garages
Ran arrow vehicl etraveling in front, e.g .a
motorbike
Rav ehicl etraveling in front on adifferent line
Due to the nature of the system ,particularly
complicate dbutnon-critica ldriving conditions
maya lsoc ause Adaptive Brake Assist to inter-
vene.
If yo ufailtoa dapt your driving style ,Adaptive
Brake Assist can neither reduce the ris kofacci-
dent nor override the laws of physics. Adaptive
Brake Assist canno ttake into account road,
weather or traffic conditions. Adaptive Brake
Assist is onlyana id.Y ou arer esponsibl efor the
distance to the vehicl einfront, for vehicle
speed ,braking in goo dtime and for staying in
your lane.
Following damage to the front end of the vehicle,
have the configuratio nand operatio nofthe
rada rsensor checked at aquali fied specialist
workshop.T hisa lsoa pplies to collisions at slow
speed swhe
re the rei
snov isible damage to the
front of the vehicle.
If yo uchange whee lsize, make sure they corre-
spond to the correct whee lsizec ategory
(
Ypage 267). If the categor yischangedw ithout
recoding the contro lunits in the vehicle, the
functioning of Adaptive Brake Assist mayb e
impaired .COL LISION PREVENTION ASSIST may
then detect amalfunctio nand switch itsel foff.
If Adaptive Brake Assist is not availabl edueto a
malfunctio ninthe rada rsensor system ,the
brake system remains availabl ewithf ullb rake
boosting effect and BAS.
Operation
With the hel pofthe rada rsensor system ,Adap-
tive Brake Assist can detect obstacle sthath ave
been in the path of your vehicl efor an extended
perio doft ime.Adaptive Brake Assist does not
react to stationar yobstacles. If Adaptive Brake Assist detects
ariskofc ollision with avehicle
traveling in front or with astationar yobstacle,
the system calculate sthe braking forc eneces-
sary to avoidt hiscollision. If yo uapply the
brakes forcefully, Adaptive Brake Assist will
automaticall yincrease the braking forc etoa
level suitabl efor the traffic conditions.
XBrake unti lthe distance to the obstacle
increases and the ris kofacollision passes.
ABS
prevents the wheels from locking.
The brakes functio nasusual againif:
Ryour elease the brake pedal
Rther eisnol ongera ny dangerofac ollision
Rno obstacle is detecte dinfront of your vehicle
Braking assistance is then ended.
Blind SpotA ssist
General notes
Blind Spo tAssist monitors the area soneither
side of the vehicl ethata renot visible to the
driver with two lateral, rear-facing rada rsensors
in the bumper. It supports yo ufrom speed sof
approximately20m ph (30 km/h).Awarning
display in the exterio rmirrors draws your atten-
tio ntov ehicles detecte dinthe monitore darea.
If yo uthen switch on the corresponding turn
signaltoc hange lane, yo uwilla lsor eceive an
optica land audibl ecollision warning.
Important safety notes
GWARNING
Blind Spo tAssist does not react to:
Rvehicles overtake ntoo closel yonthe side,
placing them in the blind spo tarea
Rvehicles which approach with alarge speed
differential and overtake your vehicle
As aresult, Blind Spo tAssist mayn ot give
warning sinsuchs ituations. There is arisko f
an accident.
Alway sobserve the traffic conditions care-
fully, and maintain asafel atera ldistance.
Blind Spo tAssist is onlyana id.Itm ayfailto
detect som evehicles and is no substitute for
attentive driving .Alway sensure thatt hereis
Driving systems145
Driving an dparking
Z

Standard:the sensitivity with which the sys-
tem determines the attention level is set to
normal.
Sensitive: the sensitivity is set higher. The
driver is warned earlier.
When ATTENTION ASSIST is switched on and
the vehicle engine is running:
Ron vehicles without steering wheel buttons,
the À indicator lamp in the instrument
cluster lights up
Ron vehicles with steering-wheel buttons, the
display shows the Àsymbol:
-in the status area
-in the Status Overviewof the Assist.menu (Ypage 183)
For vehicles with steering wheel buttons, if you
deactivate ATTENTION ASSIST, the system is
automatically re-activated when you start the
engine. The system sensitivity then corresponds to the last selection activated –standard or sen-
sitive.
If you switch off ATTENTION ASSIST in avehicle
without steering wheel buttons, the system
remains switched off even after you start the
engine. The status of the system after switching
on the engine always corresponds to the status
last selected.
Warning in the display
If the system detectst iredness or increasing
lapses in concentration, the warning Atten‐
tion Assist: TakeaBreak!orAttent.Asst: Take Break!is shown in the display.
An additional warning tone sounds.
XIf necessary, take abreak.
XConfirm the message by pressing the a
button on the steering wheel.
On long journeys, take regular breaks in good
time to allow yourself to rest. If you do not take
ab reak and ATTENTION ASSIST continues to
detect increasing lapses in concentration, you
will be warned again after 15 minutes at the
earliest. This will only happen if ATTEN-
TION ASSIST still detectst ypical indicators of
fatigue or increasing lapses in concentration.
PARKTRONIC
General notes
PARKTRONIC is an electronic parking aid. The
system is equipped with ultrasonic sensors in
the front and rear bumpers to monitor the area
around your vehicle. PARKTRONIC indicates vis-
uallya nd audibly the distance between your
vehicle and an object.
Your vehicle features two separate sound emit-
ters with different frequencies for the warning
tones. The warning ranges in front of and behind the vehicle are indicated by different warning
tones.
PARKTRONIC is activated automatically when
you:
Rturn the key to position 2in the ignition lock
Rrelease the parking brake and
Rmove the selector lever to D,Nor R
PARKTRONIC is deactivated at speeds above
11 mph (18 km/h). PARKTRONIC is reactivated
at speeds below 10 mph (16 km/h).
Important safety notes
PARKTRONIC is only an aid. It cannot replace
your own awareness of the immediate surround-
ings. You are responsible for safe maneuvering,
parking and pulling away.W hen maneuvering,
parking and pulling away,m ake sure that there
are no persons, animals or object sinthe maneu-
vering area.
!Pay particular attention to obstacles above
or below the sensors when parking, such as
flower pots or trailer towbars. PARKTRONIC
does not recognizes uch objectswhen they
are in the immediate vicinity of the vehicle.
You could damage the vehicle or objects.
PARKTRONIC can suffer interference from:
Rultrasonic sources such as atruck's
compressed-air brakes, an automatic car
wash or apneumatic drill
Rattachments to the vehicle, e.g. rear moun-
ted racks
Rnumber plates (vehicle license plates) that
are not affixed flat against the bumper
Rdirty or icy sensors
Remove adetachable trailer coupling if it is no
longer required. PARKTRONIC measures the
minimum detection range to an obstacle from
the bumper, not the ball coupling.
150Driving systems
Driving and parking

Problems with PARKTRONIC
ProblemPossible causes/consequences andMSolutions
Only the red segments in
the PARKTRONIC warn-
ing displaysare lit.
Aw arning tone also
sounds for approx-
imately 2seconds.
PARKTRONIC is then
deactivated.
The indicator lamp of the
f button lights up
and the red segments in
the PARKTRONIC warn-
ing display go out.PARKTRONIC has malfunctioned and has switched itself off.
XIf problems persist, have PARKTRONIC checked at aqualified spe-
cialist workshop.
The PARKTRONIC warn-
ing displaysi mplausible
distances.
For example, all the seg-
mentsm ay be lit even
though there is no obsta-
cle present.The PARKTRONIC sensors are dirty or iced up.
XClean the PARKTRONIC sensors (Ypage 257).
XTurn the key to position 2again in the ignition lock.
The license plate or other parts attached near the sensors may not be
secured correctly.
XCheck the license plate and attachmentp arts near the sensors for
correct seating.
An external radio or ultrasonic source may be causing interference.
XCheck PARKTRONIC functions in adifferent location.
Active Parking Assist
General notes
Active Parking Assist is an electronic parking
aid. The system uses ultrasound sensors to
measure the road on both sides of the vehicle
and indicates suitable parking spaces. It can
then actively steer and brake the vehicle to help
you to park and exit the parking space.
Active Parking Assist includes the PARKTRONIC
parking aid which indicates visuallya nd audibly
the distance between your vehicle and an
object .Todot his, PARKTRONIC uses the ultra-
sonic sensors of the Active Parking Assist
(
Ypage 150).
Important safety notes
Active Parking Assist is only an aid. It is not a
substitute for your attention to the immediate
surroundings. You are responsible for safe maneuvering, parking and pulling away.M
ake
sure that no persons, animals or object sare in
the maneuvering range.
When you deactivate PARKTRONIC, Active Park-
ing Assist will also be deactivated.
For vehicles with atrailer coupling installed, the
minimum length for parking spaces will be
slightly increased.
If you have attached atrailer to your vehicle, you
should not use Active Parking Assist. Once the
electrical connection is established between
your vehicle and the trailer, Active Parking
Assist is no longer available. PARKTRONIC is
then deactivated for the rear area.
GWARNING
While parking or pulling out of aparking
space, the vehicle swings out and can drive
onto areas of the oncomingl ane. This could
result in acollision with another road user.
There is arisk of an accident.
154Driving systems
Driving and parking

Display messagesPossible causes/consequences andMSolutions
b
Chk.Traile rBrakeLamp
The trailer brak elamp is faulty.
XChange th ebulb (see th etrailer manufacturer' soperating instruc-
tions).
b
Chk .Traile rL.TailLampor Chk .Traile rR.TailLamp
The lef torright-hand trailer tai llamp is faulty.
XChange th ebulb (see th etrailer manufacturer' soperating instruc-
tions).
b
Aut oLamps Inopera‐tive
The ligh tsensor is faulty. The automatic headlamp feature is mal-
functioning .
XSwitchthe ligh tfunction son/of fmanually (Ypage 92).
XVisitaqualified specialist workshop .
b
Chk.RearL.T urnSignalor Chk .RearR. Tur nSignal
The rear left-han dorrear right-hand tur nsignal is faulty.
XChange th ebulb (Ypage 98).
b
Chk .Front L. Tur nSignalorChk .FrontR.TurnSignal
The fron tleft-han dorfrontright-hand tur nsignal is faulty.
XChange th ebulb (Ypage 98).
b
Chk .Center BrakeLamp
The high-mounte dbrak elamp is faulty.
XVisit aqualified specialist workshop .
b
Chk.L.Tail/BrakeLamporChk .R.Tail/ Brake Lam p
The leftorright-hand tai llamp/brake lamp is faulty.
XChange th ebulb (Ypage 98).
b
Check Lef tHighBea morCheck RightHig hBeam
The lef torright-hand high-beam headlamp is faulty.
XChange th ebulb (Ypage 98).
b
Licens ePlate Lam p
The leftorright-hand license plat elamp is faulty.
XVisit aqualified specialist workshop .
b
Switch Off Lights
The lights are still switched on when you leav ethe vehicle. An addi-
tional warning tone sounds.
XTurn th eligh tswitch to Ãor$.
Display message s(vehicles withou tsteering wheelbuttons)19 5
On-board computera nd displays
Z

Display messagesPossible causes/consequences andMSolutions
b
CheckTrailerBrakeLamp
The trailer brak elamp is faulty.
XChange th ebulb (see th etrailer manufacturer' soperating instruc-
tions).
b
Check Traile rLeftTai lLampor CheckTraile rRight Tai lLamp
The lef torright-hand trailer tai llamp is faulty.
XChange th ebulb (see th etrailer manufacturer' soperating instruc-
tions).
b
Aut oLampF unctionInoperative
The ligh tsensor is faulty. The automatic headlamp feature is mal-
functioning .
XSwitchthe ligh tfunction son/of fmanually (Ypage 92).
XVisitaqualified specialist workshop .
b
Check RearLeftTur nSignalor
Check Rea rRight
TurnSignal
The rear left-han dorrear right-hand tur nsignal is faulty.
XChange th ebulb (Ypage 98).
b
Check Front Lef tTurnSignalor
Check Front Right
Tur nSignal
The fron tleft-han dorfrontright-hand tur nsignal is faulty.
XChange th ebulb (Ypage 98).
b
Check Center BrakeLam p
The high-mounte dbrak elamp is faulty.
XVisit aqualified specialist workshop .
b
CheckLeftTailandBrake Lampsor
Check Right Tai l
and Brake Lamps
The leftorright-hand tai llamp/brake lamp is faulty.
XChange th ebulb (Ypage 98).
b
Check Lef tHighBea morCheck RightHig hBeam
The lef torright-hand high-beam headlamp is faulty.
XChange th ebulb (Ypage 98).
b
Licens ePlate Lam p
The leftorright-hand license plat elamp is faulty.
XVisit aqualified specialist workshop .
Display messages(vehicles wit hsteering whee lbuttons)20 9
On-board computera nd displays
Z

Tires
Display messagesPossible causes/consequencesand MSolutions
AdjustTirePressureThe tire pressure is too lo winatleastone of the tires, or the tire
pressure differenc ebetween the wheels is too great.
XCheck the tire pressure at the next opportunity (Ypage 274).
XIf necessary,c orrect the tire pressure.
XRestart the tire pressure monitor (Ypage 277).
Check TiresAn additional warning tone sounds.
The tire pressure in one or mor etiresh asdropped significantly. The
displa yshows the whee lposit ion.
GWARNING
Underinflated tire sposet he following risks:
RThe tire smayburst, especially as the load and vehicl espeed
increase.
RThe tire smaywear excessivel yand/or unevenly, which mayg reatly
impai rtire traction.
RThe handling as well as steerin gand braking characteristics mayb e
severely affected.
There is ariskofana ccident.
XStop the vehicl ewithou tmaking any sudden steerin gorbraking
maneuvers. Pa yattentio ntothe trafficc onditions whil edoing so.
XSecure the vehicl etoprevent it fromr olling away (Ypage 132).
XCheck the tiresand,ifn ecessary,c hange the whee l(Ypage 286).
XCheck the tire pressure (Ypage 274).
XIf necessary,correct the tire pressure.
WarningTireM al‐functionThe tire pressure in one or mor etire sh asdropped suddenly. The dis-
play shows the whee lposit ion.
GWARNING
Driving with aflatt ire poses ariskoft he following hazards:
RAflatt ire affects the ability to stee rorbrake the vehicle.
RYouc ould thenl osec ontro lofthe vehicle.
RContinued drivin gwithaf latt ire will cause excessive heat build-up
and possibl yafire.
There is ariskofana ccident.
XStop the vehicl ewithou tmaking any sudden steerin gorbraking
maneuvers. Pa yattentio ntothe trafficc onditions whil edoing so.
XSecure the vehicl etoprevent it fromr olling away (Ypage 132).
XCheck the tiresand,ifn ecessary,c hange the whee l(Ypage 286).
TirePressure Moni‐tor CurrentlyUnavailable
Due to asource of radi ointerference, no signals can be receive dfrom
the whee lsensors. The tire pressure monitor is temporaril ymalfunc-
tioning.
The tire pressure monitor restarts automaticall yassoona sthe prob-
le mh asbeen solved.
216Displa ymessage s(vehicles wit hsteering whee lbuttons)
On-board computera nd displays

Display messagesPossible causes/consequences andMSolutions
Wheel Sensor(s)MissingThere is no signal from th etirep ressur esensor of on eorseveral
wheels. The pressur eoftheaffecte dtireisn otshown in th edisplay.
XHav ethe fault ytirep ressur esensor replace dataqualified special -
ist workshop .
TirePressure Moni‐tor Inoperative NoWheel Sensor s
The wheels installed do no thaves uitable tire pressur esensors. The
tire pressur emonitor is deactivated.
XInstall wheels 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 malfunctioning .
XVisitaqualified 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.
Auxiliary Batter yMalfunctionThe auxiliary battery for th etransmission is no longer bein gcharged.
XVisit aqualified specialist workshop .
Apply Brake toShift from'P'You hav eattempte dtomovet he transmission selector lever to posi-
tion D,Ror Nwithout depressing th ebrak epedal .
XDepress th ebrak epedal .
RiskofR olling:TransmissionNotinP
An additional warning tone sounds. The driver's door is open and th e
transmission is in position R,N or D.
XShift th etransmission to position P.
XSecurethe vehicl etopreventitfromr ollin gaway (Ypage 132).
Servic eRequiredDoNot Shift GearsVisit Dealer
An additional warning tone sounds. You canno tchang et he transmis -
sion position due to amalfunction .
If transmission position Dis selected:
XDrive to aqualified specialist workshop without shifting th etrans -
mission from position D.
If transmission position R,N or Pis selected:
XConsult aqualified specialist workshop .
OnlyShift to 'P'whenVehicl eisSta‐tionar y
The vehicl eisstill moving .
XPull overand stop th evehicle, payin gattention to roa dand traffic
conditions.
XShift th etransmission to position P.
Display messages(vehicles wit hsteering whee lbuttons)21 7
On-board computera nd displays
Z