2019 MERCEDES-BENZ METRIS sensor

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 135).
XSwitchoff th eengine.
XClean th esensor sin th efron tbumper (Ypage 268).
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 135).
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 145).
Display messages (vehicles with steering wheel buttons)217
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 135).
XSwitchoff th eengine.
XClean th esensor sin th erear bumper (Ypage 268).
XRestart theengine.
218Display 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 286).
XIf necessary, correct the tire pressure.
XRestart the tire pressure monitor (Ypage 289).
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 135).
XCheck the tires and, if necessary, change the wheel (Ypage 298).
XCheck the tire pressure (Ypage 286).
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 135).
XCheck the tires and, if necessary, change the wheel (Ypage 298).
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)219
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 ein transmission position kor
h.
XShift th etransmission to position jori.
Auxiliary Batter yMalfunctionThe auxiliary battery for th etransmission is no longer bein gcharged.
XVisit aqualified specialist workshop .
Apply Brake toShift from'P'You attempte dto shift th etransmission to position h,kori
without 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 k,iorh.
XShift th etransmission to position j.
XSecureth evehicl eto preven tit from rollin gaway (Ypage 135).
Servic eRequiredDoNot Shift GearsVisit Dealer
An additional warning tone sounds. You canno tchang eth etransmis -
sion position due to amalfunction .
If transmission position his selected:
XConsult aqualified specialist workshop without shifting transmis -
sion position h.
If transmission position k,iorj is selected:
XNotify 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 j.
220Display messages (vehicles withsteering whee lbu ttons)
On-board computer and displays

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 175).
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 135).
XConsult a qualified specialist workshop.
Indicator and warning lamps in the instrument cluster227
On-board computer and displays
Z

Exterior
Cleaning the wheels
!Do not use any acidic or alkaline cleaning
agents. They can cause corrosion on the
wheel bolts or the retainer springs for the
wheel-balancing weights.
!Do not park your vehicle for a long period of
time directly after cleaning, particularly after
cleaning the wheel rim with wheel cleaner.
Wheel cleaner can lead to the increased cor-
rosion of the brake discs and pads. Therefore,
drive for a few minutes after cleaning. By
heating up the brakes, the brake discs and
pads dry. The vehicle can then be parked for a
long period of time.
If you clean the wheels with a power washer,
observe the safety notes for the power washer
(
Ypage 266). You could otherwise damage the
tires.
Cleaning the wiper blades
GWARNING
You could become trapped by the windshield wipers if they start moving while cleaning the
windshield or wiper blades. There is a risk of
injury.
Always switch off the windshield wipers and
the ignition before cleaning the windshield or
wiper blades.
!Do not fold the windshield wipers away from
the windshield unless the hood is closed. Oth-
erwise, you could damage the hood.
!Do not pull 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 graph-
ite coating could be damaged. This could
cause wiper noise.
!Hold the wiper arm securely when folding
back. The windshield could be damaged if the
wiper arm smacks against it suddenly.
XTurn the SmartKey to position 0in the ignition
lock or remove the SmartKey.
XFold the windshield wiper arms away from the
windshield until you feel them engage.
XCarefully clean the wiper blades with a damp
cloth.
XFold back the wiper arms before switching on
the ignition.
Cleaning the exterior lighting
!Only use cleaning agents or cleaning cloths
which are suitable for plastic light lenses.
Unsuitable cleaning agents or cleaning cloths
could scratch or damage the plastic light len- ses.
XClean the plastic covers of the exterior light-
ing with a damp sponge and a mild cleaning
agent, e.g. Mercedes-Benz car shampoo, or
with cleaning cloths.
Cleaning the sensors
!Do not use dry, coarse or hard cloths and do
not scrub. You will otherwise scratch or dam-
age the sensors.
If you clean the sensors with a power washer
or steam cleaner, observe the information
provided by the manufacturer regarding the
distance to be maintained between the vehi-
cle and the nozzle of the power washer.
XClean drive system sensors :with water, car
shampoo and a soft cloth.
268Care
Maintenance and care

Maximum tire pressures
:Maximum permitted tire pressure (example)
Never exceed the maximum permissible tire
inflation pressure. When adjusting the tire pres-
sures always observe the recommended tire
pressure for your vehicle (
Ypage 282).
iThe actual values for tires are specific to
each vehicle and may deviate from the values
in the illustration.
Tire valve (snap-in valve)
Important safety notes
GWARNING
Tire valve that are not approved for your vehi-
cle by the distributor named on the inside
cover page may result in a loss of tire pres-
sure. This may affect road safety. There is a
risk of an accident.
Only use tire valve that are approved for your
vehicle by the distributor named on the inside
cover page. Always make sure you have the
correct tire valve type for the tires on your
vehicle.
!Do not screw additional weights (check
valves, etc.) onto the tire valves. The elec-
tronic components could thus be damaged.
iFor safety reasons, Mercedes-Benz recom-
mends that you only use tire valves that have been tested for use on your vehicle.
Checking the tire pressure manually
In order to determine and adjust the tire pres-
sures, proceed as follows:
XRemove the valve cap of the tire you wish to
check.
XPress the tire pressure gauge securely onto
the valve.
XRead the tire pressure and compare it with the
recommended value on the loading informa-
tion table or the tire pressure table
(
Ypage 282).
XIf the tire pressure is too low, increase it to the
recommended value.
XIf the tire pressure is too high, release air by
pressing down the metal pin in the valve. Use
the tip of a pen, for example. Then, check the
tire pressure again using the tire pressure
gauge.
XScrew the valve cap onto the valve.
XRepeat the steps for the other tires.
Tire pressure monitor
General notes
In vehicles with a tire pressure monitor system,
the vehicle's wheels have sensors installed
which monitor the tire pressure in all four tires.
The tire pressure monitor warns you if the pres- sure drops in one or more of the tires. The tire
pressure monitor only functions if the corre-
sponding sensors are installed on all wheels.
Tire pressure display (only on vehicles with steer-
ing wheel buttons)
On vehicles with steering-wheel buttons, the
current pressure of the individual wheels in the
display can be shown via the Service
menu.
286Tire pressure
Wheels and tires

Only use wheel bolts that have been designed
for the wheel and the vehicle. For safety rea-
sons, Mercedes-Benz recommends that you
only use wheel bolts which have been approved
for Mercedes-Benz vehicles and the respective
wheel.
!On vehicles equipped with a tire pressure
monitor, electronic components are located
in the wheel.
Tire-mounting tools should not be used near
the valve. This could damage the electronic
components.
Only have tires changed at a qualified spe-
cialist workshop.
XClean the wheel and wheel hub contact sur-
faces.
XSlide the new wheel onto the wheel hub and
push it on.
XScrew in the wheel bolts and tighten them
lightly.
Lowering the vehicle
GWARNING
The wheels could work loose if the wheel nuts and bolts are not tightened to the specified
tightening torque. There is a risk of accident.
Have the tightening torque immediately
checked at a qualified specialist workshop
after a wheel is changed.
:—AWheel bolts
XPlace the adapter and the ratchet on the hex-
agon head nut of the jack such that the let-
tering AB/DOWN is visible.
XTurn the ratchet in the AB/DOWNdirection
until the vehicle is once again standing firmly
on the ground.
XPut the jack aside.
XTighten the wheel bolts evenly in a crosswise
pattern in the sequence indicated (: toA).
Tighten the wheel bolts to the following tight-
ening torques:
RSteel wheel 147 lb-ft(200 Nm)
RAlloy wheel 133 lb-ft(180 Nm)
XTurn the jack back to its out-of-use position.
XStow the jack and the rest of the tire-change
tool kit in the vehicle again.
XWheel with hub cap: position the opening for
the tire valve in the hub cap over the tire valve.
XPush the edge of the hub cap with both hands
against the wheel until it clicks into place.
Make sure the hub cap retaining catches
engage on the steel wheel.
XIf included in the vehicle equipment, secure
the faulty wheel in the spare wheel bracket
(
Ypage 303). Otherwise, transport the faulty
wheel in the cargo compartment.
XCheck the tire pressure of the newly mounted
wheel and adjust it if necessary.
Observe the recommended tire pressure
(
Ypage 282).
Vehicles with the tire pressure monitor sys-
tem: all mounted wheels must be equipped
with functioning sensors.
XRetighten the wheel bolts or wheel nuts to the
specified tightening torque after the vehicle
has been driven for 30 miles (50 km).
Changing wheels301
Wheels and tires
Z