ECU MERCEDES-BENZ METRIS 2017 MY17 Operator’s Manual

Display messagesPossible causes/consequences andMSolutions
?The fan motor is faulty.
XCheckth e? coolan ttemperature gage in th einstrumen tclus -
ter.
If th ecoolan ttemperature is belo wthemaximum value specified
below, you can continu edrivin gto th eneares tqualified specialist
workshop .
Avoid heav yloads on th eengine, e.g. drivin gin mountainous terrain ,
and stop-start traffic.
Under normal operating condition sand wit hth especified coolan t
level, th e? gage may ris eto 24 8 ‡(120†).
+
CheckCoolan tLevelSee Oper. Manual
The coolan tlevel is to olow.
!Avoid making lon gjourneys wit hto olittl ecoolan tin th eengin e
coolin gsystem. The engin ewill otherwise be damaged.
XAd dcoolant, making sur eto observ eth ewarning note s
(Ypage 253).
XHav eth eengin ecoolin gsystem checke dat aqualified specialist
workshop if th ecoolan tneeds to be refilled mor eoften than usual.
4
CheckEngineOilAtNex tRefueling
XChec kth eoil level at th elatest when next refuelin g (Ypage 252).
XIf necessary, add engineoil (Ypage 253).
XTo confir mtheoil check :press a.
XHaveth eengin echecke dat aqualified specialist workshop if you
need to add engin eoil mor eoften than usual.
!Avoid lon gjourneys wit hto olittl eengin eoil. The engin ewill oth-
erwise be damaged.
4
Manually Check OilLevel
Reminder to chec kth eoil level.
XChec kth eoil level at th elatest when next refuelin g (Ypage 252).
XIf necessary, add engineoil (Ypage 253).
!Avoid lon gjourneys wit hto olittl eengin eoil. The engin ewill oth-
erwise be damaged.
4
Eng .OilLevelLow:StopVehicl eTur nEngine Off
The oil level is to olow. There is aris kof engin edamage.
XStop th evehicl eimmediately, payin gattention to roa dand traffic
conditions, and switch off th eengine.
XSecur eth evehicl eto preven tit from rollin gaway (Ypage 133).
XCheckth eoil level (Ypage 252).
XIf necessary, add engin eoil (Ypage 253).
æ
Fue lLevel Low
The fuel level has dropped to th ereserv erange.
XRefue lat th eneares tgas station .
ÏThere is ver ylittl efuel in th efuel tank.
XRefue lat th eneares tgas station without fail .
Display messages (vehicles withsteering whee lbu ttons)213
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
Collision Preven‐tionAssist Cur ‐rentlyUnavail.SeeOper. Manual
COLLISION PREVENTION ASSIST PLU Sis temporarily inoperative.
Possibl ecauses:
RThe sensor sin th efron tbumper are dirty.
RThe function is impaire ddue to heav yrain or snow.
RThe radar sensor system is temporarily inoperative, e.g. due to
electromagneti cradiation emitted by nearby TV or radi ostation sor
other source sof electromagneti cradiation .
RThe system is outside th eoperating temperature range.
RThe on-boar dvoltag eis to olow.
Once th ecauses listed abov eno longer apply, th edisplay message
goe sout and COLLISION PREVENTION ASSIST is operational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicle, payin gattention to roa dand traffic
conditions.
XSecur eth evehicl eto preven tit from rollin gaway (Ypage 133).
XSwitchoff th eengine.
XClean th esensor sin th efron tbumper (Ypage 266).
XRestart th eengine.
Lan eKeepin gAssistInoperativeLaneKeepin gAssis tis faulty.
XVisit aqualified specialist workshop .
LaneKeepin gAssistCurrently Unavail.See Oper. Manual
LaneKeepin gAssis tis deactivated and temporarily inoperative. Pos -
sibl ecauses:
RThe windshield is dirty in th ecamera' sfield of vision .
RVisibilityis impaire ddue to heav yrain ,snow or fog .
RThere are no lan emarking sfor an extended period.
RThe lan emarking sare wor naway, dark or covered, e.g. by dir tor
snow.
Once th ecauses listed abov eno longer apply, th edisplay message
goe sout and Lan eKeepin gAssis tis operational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicle, payin gattention to roa dand traffic
conditions.
XSecur eth evehicl eto preven tit from rollin gaway (Ypage 133).
XClean th ewindshield.
Cruise Contro lLDC_Spd_DsrspeedUnit
Acondition for activating cruise control has no tbeen met .
You hav etried to store aspeed belo w20 mph (30 km/ h)for example.
XIf conditions permit, drive faster than 20 mph (30 km/h) and store
the speed.
XCheck the activation conditions for cruise control (Ypage 143).
Display messages (vehicles with steering wheel buttons)215
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
Blind SpotAssistInoperativeBlind Spot Assis tis faulty.
XVisit aqualified specialist workshop .
Blind SpotAssistCurrently Unavail.See Operator' sMan ‐ual
Blind Spot Assis tis temporarily inoperative. Possibl ecauses:
RYou hav eattached atrailer .
RThe sensor sin th erear bumper are dirty.
RThe function is impaire ddue to heav yrain or snow.
RThe radar sensor system is temporarily inoperative, e.g. due to
electromagneti cradiation emitted by nearby TV or radi ostation sor
other source sof electromagneti cradiation .
RThe system is outside th eoperating temperature range.
Once th ecauses listed abov eno longer apply, th edisplay message
goe sout and Blind Spot Assis tis operational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicle, payin gattention to roa dand traffic
conditions.
XSecur eth evehicl eto preven tit from rollin gaway (Ypage 133).
XSwitchoff th eengine.
XClean th esensor sin th erear bumper (Ypage 266).
XRestart theengine.
216Display messages (vehicles withsteering whee lbu ttons)
On-board computer and displays

Tires
Display messagesPossible causes/consequences andMSolutions
AdjustTirePressureThe tire pressure is too low in at least one of the tires, or the tire
pressure difference between the wheels is too great.
XCheck the tire pressure at the next opportunity (Ypage 284).
XIf necessary, correct the tire pressure.
XRestart the tire pressure monitor (Ypage 287).
Check TiresAn additional warning tone sounds.
The tire pressure in one or more tires has dropped significantly. The
display shows the wheel position.
GWARNING
Underinflated tires pose the following risks:
RThe tires may burst, especially as the load and vehicle speed
increase.
RThe tires may wear excessively and/or unevenly, which may greatly
impair tire traction.
RThe handling as well as steering and braking characteristics may be
severely affected.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions while doing so.
XSecure the vehicle to prevent it from rolling away (Ypage 133).
XCheck the tires and, if necessary, change the wheel (Ypage 296).
XCheck the tire pressure (Ypage 284).
XIf necessary, correct the tire pressure.
Warning Tire Mal‐functionThe tire pressure in one or more tires has dropped suddenly. The dis-
play shows the wheel position.
GWARNING
Driving with a flat tire poses a risk of the following hazards:
RA flat tire affects the ability to steer or brake the vehicle.
RYou could then lose control of the vehicle.
RContinued driving with a flat tire will cause excessive heat build-up
and possibly a fire.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions while doing so.
XSecure the vehicle to prevent it from rolling away (Ypage 133).
XCheck the tires and, if necessary, change the wheel (Ypage 296).
Tire Pressure Moni‐tor CurrentlyUnavailable
Due to a source of radio interference, no signals can be received from
the wheel sensors. The tire pressure monitor is temporarily malfunc-
tioning.
The tire pressure monitor restarts automatically as soon as the prob-
lem has been solved.
Displa y messages (vehicles withsteering whee lbu ttons)217
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
Wheel Sensor(s)MissingThere is no signal from th etire pressur esensor of on eor several
wheels. The pressur eof th eaffecte dtire is no tshown in th edisplay.
XHav eth efault ytire pressur esensor replace dat aqualified special -
ist workshop .
TirePressure Moni‐tor Inoperative NoWheel Sensor s
The wheels installed do no thav esuitable 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
a few 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 dto start th eengin ewit hth etransmission 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 dto mov eth etransmission selector lever to posi-
tion D,Ror Nwithout depressing th ebrak epedal .
XDepress th ebrak epedal .
Riskof Rolling: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.
XSecureth evehicl eto preven tit from rollin gaway (Ypage 133).
Servic eRequiredDoNot Shift GearsVisit Dealer
An additional warning tone sounds. You canno tchang eth etransmis -
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'whe nVehicl eisSta‐tionar y
The vehicl eis still moving .
XPull overand stop th evehicle, payin gattention to roa dand traffic
conditions.
XShift th etransmission to position P.
218Display messages (vehicles withsteering whee lbu ttons)
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
ÒThe tailgateis open .
XCloseth etailgate.
ÑThe rear door is open .
XCloseth erear door(s).
ÓAn additional warning tone sounds. The hoo dis open .
GWARNIN G
The open hoo dmay then bloc kyour vie wwhen th evehicl eis in motion .
There is aris kof an accident.
XStop th evehicl eimmediately, payin gattention to roa dand traffic
conditions.
XSecur eth evehicl eto preven tit from rollin gaway (Ypage 133).
XCloseth ehood.
CAn additional warning tone sounds while th evehicl eis in motion .The
display shows th eopen door(s).
XClos eall doors.
Ð
Power Steering Mal ‐function See Oper.Manual
An additional warning tone sounds. The steering powe rassistanc e
could be malfunctioning .You may need to steer mor eforcefully.
XCarefully continu eto aqualified specialist workshop and hav eth e
steering checke dimmediately.
Â
Obtain aNew Key
The ke yneeds to be replaced.
XVisit aqualified specialist workshop .
Phone No ServiceYour vehicleis outside th enetwork provider' stransmitter/receiver
range.
¥
Check Washer Fluid
The washer flui dlevel in th ewasher flui dreservoir has dropped belo w
th eminimum .
XAddwasher flui d (Ypage 256).
Indicatorand warning lamps in the instrume nt cluster
General notes
Whe nswitching on th eignition ,som esystems carry out aself-test .Some indicator and warning
lamp smay temporarily tur non or start to flash. This is no tan indication of any problem .Only when
these indicator and warning lights tur non or start flashin gafter th eengin ehas started or during th e
journey has amalfunction occurred .
Indicator and warning lamps in the instrument cluster219
On-board computer and displays
Z

Safety systems
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
$J
òN$ (USA only) or J(Canada only): the ABS and brake warning lamps are
lit while the engine is running.
EBD is unavailable due to a malfunction. ABS, BAS, hill start assist and ESP
®as well
as its driving safety systems, for example, are therefore also unavailable.
ATTENTION ASSIST is deactivated and other driving systems could be automati-
cally deactivated.
GWARNING
The brake system continues to function normally, but without the functions listed
above. The wheels could therefore lock prematurely if you brake hard, for example.
This causes steerability and braking to be greatly impaired. The braking distance
can increase in emergency braking situations.
If ESP
®is not operational, ESP®will not stabilize the vehicle.
There is an increased risk of skidding and accidents.
XSwitch the engine off, wait briefly and start the engine again.
XCheck if the display message has disappeared and ESP®is operational.
XIf the display message continues to be displayed:
RDrive on with care.
RVisit a qualified specialist workshop immediately.
$JN The red $(USA only) or J(Canada only) brake system warning lamp is lit
while the engine is running. An additional warning tone sounds.
There is insufficient brake fluid in the brake fluid reservoir.
GWARNING
Braking performance can be impaired.
There is a risk of an accident.
XStop the vehicle immediately, paying attention to road and traffic conditions. Do
not continue driving under any circumstances.
XSecure the vehicle to prevent it from rolling away (Ypage 133).
XDo not add brake fluid. Adding more will not remedy the malfunction.
XConsult a qualified specialist workshop.
XObserve the display messages.
Indicator and warning lamps in the instrument cluster221
On-board computer and displays
Z

Engine
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
;NThe yellow Check Engine warning lamp lights up while the engine is running.
There may be a malfunction, for example:
Rin the engine management
Rin the transmission management
Rin the fuel injection system
Rin the exhaust system
Rin the ignition system (for vehicles with a gasoline engine)
Rin the fuel system
The emission limit values may be exceeded and the engine may be running in
emergency mode.
XHave the vehicle checked as soon as possible at a qualified specialist workshop.
æN The yellow reserve fuel warning lamp is on while the engine is running.
The fuel level has dropped to the reserve range.
XRefuel at the nearest gas station.
?N The red coolant warning lamp comes on while the engine is running.
On vehicles without steering wheel buttons, the coolant temperature gage is at the
start of the bar display (
Ypage 173).
On vehicles with steering wheel buttons, the coolant temperature gage is at the
start of the scale in the instrument cluster (
Ypage 39).
The temperature sensor for the coolant temperature gage is faulty.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
XStop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine. Do not continue driving under any circumstances.
XSecure the vehicle to prevent it from rolling away (Ypage 133).
XConsult a qualified specialist workshop.
Indicator and warning lamps in the instrument cluster225
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
?NThe red coolant warning lamp comes on while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked or
the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooled sufficiently.
XObserve the display messages.
XStop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
XSecure the vehicle to prevent it from rolling away (Ypage 133).
XExit the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
XCheck the coolant level and add coolant, observing the warning notes
(Ypage 253).
XIf you have to add coolant more frequently, have the engine cooling system
checked.
XMake sure that the air supply to the radiator is not obstructed, by frozen slush
for example.
XCheck the coolant temperature:
Rusing the display in the on-board computer on vehicles without steering wheel
buttons (Ypage 173)
Rusing the analog display in the instrument cluster on vehicles with steering
wheel buttons (Ypage 39)
XDo not start the engine again until the coolant temperature is below the maxi-
mum value specified below. The engine could otherwise be damaged.
XDrive to the nearest qualified specialist workshop.
Avoid heavy loads on the engine, e.g. driving in mountainous terrain, and stop-
start traffic.
Under normal operating conditions and with the specified coolant level, the cool-
ant temperature gage may rise to 248 ‡ (120 †).
?N The red coolant warning lamp comes on while the engine is running. An addi-
tional warning tone sounds.
The coolant temperature has exceeded the maximum value specified below. The
airflow to the engine radiator may be blocked or the coolant level may be too low.
GWARNING
The engine is not being cooled adequately and could become damaged.
Never drive with an overheated engine. Otherwise, fluids which may have leaked
into the engine compartment could catch fire.
In addition, steam from an overheated engine can cause serious burns, which can
occur just by opening the hood.
There is a risk of injury.
XObserve the display messages.
XStop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
XSecure the vehicle to prevent it from rolling away (Ypage 133).
226Indicator and warning lamps in the instrument cluster
On-board computer and displays

Tires
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
hNThe yellow tire pressure monitor warning lamp (pressure loss/malfunction) is lit.
The tire pressure monitor has detected a loss of pressure in at least one of the tires.
GWARNING
Underinflated tires pose the following risks:
RThe tires may burst, especially as the load and vehicle speed increase.
RThe tires may wear excessively and/or unevenly, which may greatly impair tire traction.
RThe handling as well as steering and braking characteristics may be severely
affected.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking maneuvers. Pay
attention to the traffic conditions while doing so.
XSecure the vehicle to prevent it from rolling away (Ypage 133).
XObserve the display messages.
XCheck the tires and, if necessary, change the wheel (Ypage 296).
XCheck the tire pressure.
You can check the tire pressure electronically on vehicles with steering wheel
buttons (
Ypage 284).
XIf necessary, correct the tire pressure.
hN The yellow tire pressure monitor (pressure loss/malfunction) warning lamp
flashes for approximately one minute and then remains lit.
The tire pressure monitor is malfunctioning.
GWARNING
The system may not be able to detect or signal low tire pressure as intended.
There is a risk of an accident.
XObserve the display messages.
XVisit a qualified specialist workshop.
228Indicator and warninglamps in the instrument cluster
On-board computer and displays