ECU MERCEDES-BENZ SLC 2019 Service Manual

Stowage areas
Stowage spaces
Important safety notes
GWARNING
If objects in the passenger compartment are
stowed incorrectly, they can slide or be
thrown around and hit vehicle occupants. In
addition, cup holders, open stowage spaces
and mobile phone brackets cannot always
retain all objects they contain. There is a
risk of injury, particularly in the event of sud-
den braking or a sudden change in direction.
RAlways stow objects so that they cannot
be thrown around in such situations.
RAlways make sure that objects do not pro-
trude from stowage spaces, parcel nets or
stowage nets.
RClose the lockable stowage spaces before
starting a journey.
RAlways stow and secure heavy, hard, poin-
ted, sharp-edged, fragile or bulky objects
in the trunk.
Glove compartment
XTo open:pull handleCand open glove boxflapD.
XTo close:fold glove box flapDup until itengages.
The glove box flap contains brackets for coins,pens, and credit and service cards.
The glove box can be locked and unlockedusing the mechanical key.
XTo lock:insert the mechanical key into thelock and turn it to positionH.
XTo unlock:insert the mechanical key intothe lock and turn it to positionG.
Stowage compartment/telephone
compartment under the armrest
XTo open:push buttonCup and raise arm-restD.
The stowage compartment can be locked andunlocked centrally using the SmartKey(Ypage 66).
iDepending on the vehicle equipment, aUSB port and a Media Interface is installedin the stowage compartment. A Media Inter-face is a universal interface for mobile audio
equipment, e.g. for an iPod®or MP3 Player .
Stowage areas225
Stowage and features
Z

Reversible floor panel in the trunk
The trunk floor is level when you use the outerside of the reversible floor panel. If you turnthe floor panel over, you can transport objectssuch as a beverage crate on the underside ofthe panel.
XTo turn over:lift reversible floor panelDusing tabC.
XTurn over and then re-insert reversible floorpanelD.
Two flexible strapsDare attached to thereversible floor panel, use these to secureobjects, such as wind screen

!Do not expose drinks bottles in the cupholder in the center console to continuous,strong and direct sunlight. The passengercompartment in the area of the center con-sole can otherwise be damaged by the con-centrated and reflected sunlight.
Cup holder in the center console
XTo open:slide coverDback.
XTo remove the insert:slide catchCinwards on both sides in the direction of thearrow.
XRemove the cup holder insert upwards.
XTo re-install the insert:place the insert inthe stowage space.
XSlide catchCoutwards in the direction ofthe arrow until it engages.
You can remove the cup holder insert forcleaning. Clean with clear, lukewarm wateronly.
Bottle holder
Observe the "Important safety notes" in the"Stowage compartments" section(Ypage 225).
!Make sure that any bottles weighing morethan 1.1 lb(0.5 kg) that are stored in thebottle holder, rest on the vehicle floor. Thebottle holder could otherwise be damaged.
XPress the outer edge of buttonCand slidein the direction of the arrow until the bottlefits into the opening.
XInsert the bottle into the bottle holder.
The bottle holder is suitable for bottles with acapacity of 25 fl. oz. (0.7 l) to 54 fl. oz. (1.5 l).
The bottle holder does not secure the bottles;it merely prevents them from tipping over.
Sun visors
Overview
GWARNING
If the mirror cover of the vanity mirror is fol-
ded up when the vehicle is in motion, you
could be blinded by incident light. There is a
risk of an accident.
Always keep the mirror cover folded down
while driving.
CMirror light
DBracket

Have the system checked at the nearestMercedes-Benz Service Center or contact thefollowing service hotlines:
RUSA:Mercedes-Benz Customer AssistanceCenter at 1-800-FOR-MERCedes(1-800-367-6372) or 1-866-990-9007
RCanada:Customer Service at1-888-923-8367
Emergency call
Important safety notes
GWARNING
It can be dangerous to remain in the vehicle,
even if you have pressed the SOS button in
an emergency if:
Ryou see smoke inside or outside of the
vehicle, e.g. if there is a fire after an acci-
dent
Rthe vehicle is on a dangerous section of
road
Rthe vehicle is not visible or cannot easily
be seen by other road users, particularly
when dark or in poor visibility conditions
There is a risk of an accident and injury.
Leave the vehicle immediately in this or sim-
ilar situations as soon as it is safe to do so.
Move to a safe location along with other
vehicle occupants. In such situations, secure
the vehicle in accordance with national regu-
lations, e. g. with a warning triangle.
A license agreement must be in place in orderto activate the Mercedes me connect service.Make sure that your system is activated andoperational. To register, press the

XReach into the gap, pull hood catch han-dleDup and lift hoodC.
If you lift the hood by approximately 15 in(40 cm), the hood is opened and held openautomatically by the gas-filled strut.
Closing the hood
XLower the hood and let it fall from a heightof approximately 8 in (20 cm).
XCheck that the hood has engaged properly.If the hood can be raised slightly, it is notproperly engaged. Open it again and close itwith a little more force.
Engine oil
Notes on the oil level
Depending on your driving style, the vehicleconsumes up to 0.9 US qt(0.8 liters) of oil per600 miles (1,000 km). The oil consumptionmay be higher than this when the vehicle isnew or if you frequently drive at high enginespeeds.
Depending on the engine, the oil dipstick maybe in a different location.
When checking the oil level:
Rpark the vehicle on a level surface
Rthe engine should be switched off forapproximately five minutes if the engine isat normal operating temperature
Rif the engine is not at normal operating tem-perature, e.g. if the engine was only startedbriefly, wait about 30 minutes before carry-ing out the measurement
Checking the oil level using the oil dip-
stick
GWARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very
hot. Working in the engine compartment
poses a risk of injury.
Only touch the following components descri-
bed.
If work is being carried out on public roads,pay attention to the road and traffic conditionsand secure the area as appropriate.
Example
XPull out oil dipstickC.
XWipe off oil dipstickC.
XSlowly slide oil dipstickCinto the guidetube to the stop, and take it out again.If the level is between MIN mark

GWARNING
If engine oil comes into contact with hot
components in the engine compartment, it
may ignite. There is a risk of fire and injury.
Make sure that engine oil is not spilled next
to the filler neck. Let the engine cool down
and thoroughly clean the engine oil off the
components before starting the engine.
HEnvironmental note
When adding oil, take care not to spill any. If
oil enters the soil or waterways, it is harmful
to the environment.
!Use only engine oils and oil filters that areapproved for vehicles with a service system.A list of the engine oils and oil filters thathave been tested and approved in accord-ance with Mercedes-Benz Specifications forService Products is available at any author-ized Mercedes-Benz Center.
The following cause engine failure or dam-age to the exhaust system:
RUse of engine oils and oil filters that havenot been expressly approved for the ser-vice system
RReplacement of engine oil and oil filterafter the replacement interval specifiedby the service system has expired
RUse of engine oil additives
!Do not add too much oil. If the oil level isabove the "max" mark on the dipstick, toomuch oil has been added. This can lead todamage to the engine or the catalytic con-verter. Have excess oil siphoned off.
Example: engine oil cap
XTurn capCcounter-clockwise and removeit.
XAdd engine oil.If the oil level is at or below the MIN markon the oil dipstick, add 1.1 US qt (1.0 liter)of engine oil.
XReplace capCon the filler neck and turnclockwise.Ensure that the cap locks into placesecurely.
XCheck the oil level again with the oil dipstick(Ypage 241).
Further information on engine oil(Ypage 300).
Checking and adding other service
products
Checking coolant level
GWARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very
hot. Working in the engine compartment
poses a risk of injury.
Where possible, let the engine cool down
and touch only the components described in
the following.
GWARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
GWARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off.
There is a risk of injury.
242Engine compartment
Maintenance and care

Cleaning the vehicle parts
Cleaning the wheels
GWARNING
The water jet from a circular jet nozzle (dirt
blasters) can cause invisible exterior dam-
age to the tires or chassis components.
Components damaged in this way may fail
unexpectedly. There is a risk of an accident.
Do not use power washers with circular jet
nozzles to clean the vehicle. Have damaged
tires or chassis components replaced imme-
diately.
!Do not use acidic wheel cleaning productsto remove brake dust. This could damagewheel bolts and brake components.
!Do not park your vehicle for a long periodof time directly after cleaning, particularlyafter cleaning the wheel rim with wheelcleaner. Wheel cleaner can lead to theincreased corrosion of the brake discs andpads. Therefore, drive for a few minutesafter cleaning. By heating up the brakes, thebrake discs and pads dry. The vehicle canthen be parked for a long period of time.
Cleaning the windows
GWARNING
You could become trapped by the wind-
shield 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 use dry cloths, abrasive products,solvents or cleaning agents containing sol-vents to clean the inside of the windows. Donot touch the insides of the windows withhard objects, e.g. an ice scraper or ring.There is otherwise a risk of damaging thewindows.
!Clean the water drainage channels of thewindshield and the rear window at regularintervals. Deposits such as leaves, petalsand pollen may under certain circumstances
prevent water from draining away. This canlead to corrosion damage and damage toelectronic components.
XClean the inside and outside of the windowswith a damp cloth and a cleaning productthat is recommended and approved byMercedes-Benz.
Cleaning wiper blades
GWARNING
If the windshield wipers are set in motion
while you are cleaning the windshield, you
can be trapped by the wiper arm. There is a
risk of injury.
Always switch off the windshield wipers and
the ignition before cleaning the windshield.
!Do not pull the wiper blade. Otherwise, thewiper blade could be damaged.
!Do not clean wiper blades too often anddo not rub them too hard. Otherwise, thegraphite coating could be damaged. Thiscould cause wiper noise.
!Hold the wiper arm securely when foldingback. The windshield could be damaged ifthe wiper arm smacks against it suddenly.
XFold the windshield wiper arms away fromthe windshield.
XCarefully clean the wiper blades with adamp cloth.
XFold the windshield wiper arms back againbefore switching on the ignition.
Cleaning the exterior lighting
!Only use cleaning agents or cleaningcloths that are suitable for plastic lenses.Caustic, irritant or otherwise unsuitablecleaning agents or cleaning cloths couldscratch or damage the exterior lighting plas-tic lenses.
XClean the plastic lenses of the exterior lightswith a wet sponge and a mild cleaningagent, e.g. Mercedes-Benz car shampoo orcleaning cloths.
Care249
Maintenance and care
Z

teristics, e.g. winter tires. A TIREFIT kit may beobtained from a qualified specialist workshop.
Information on changing and mounting wheels(Ypage 288).
XStop the vehicle on solid, non-slippery andlevel ground, as far away as possible fromtraffic.
XSwitch on the hazard warning lamps.
XSecure the vehicle against rolling away(Ypage 134).
XIf possible, bring the front wheels into thestraight-ahead position.
XSwitch off the engine.
XVehicles without KEYLESS-GO:removethe SmartKey from the ignition lock.
XVehicles with KEYLESS-GO:open the driv-er's door.The vehicle electronics are now in positionZ. This is the same as the SmartKey havingbeen removed.
XVehicles with KEYLESS-GO:remove theStart/Stop button from the ignition lock(Ypage 118).
XMake sure that the passengers are notendangered as they do so. Make sure thatno one is near the danger area while awheel is being changed. Anyone who is notdirectly assisting in the wheel changeshould, for example, stand behind the bar-rier.
XGet out of the vehicle. Pay attention to traf-fic conditions when doing so.
XClose the driver's door.
MOExtended tires (tires with run-flat
properties)
General notes
With MOExtended tires (tires with run flatcharacteristics), you can continue to drive yourvehicle even if there is a total loss of pressurein one or more tires. The affected tire must notshow any clearly visible damage.
You can recognize an MOExtended tire by theMOExtended marking which appears on thesidewall of the tire. You will find this markingnext to the tire size designation, the load-bear-ing capacity and the speed index(Ypage 283).
MOExtended tires may only be used in con-junction with an active tire pressure loss warn-ing system or with an active tire pressure mon-itor.
If a pressure loss warning messageappears in the multifunction display:
Robserve the instructions in the display mes-sages (Ypage 201)
Rcheck the tire for damage
Rif driving on, observe the following notes
The driving distance possible in run-flat modeis approximately 50 miles (80 kilometers)when the vehicle is partially laden and approx-imately 19 miles (30 kilometers) when thevehicle is fully laden.
In addition to the vehicle load, the driving dis-tance possible depends upon:
RVehicle speed
RRoad condition
ROutside temperature
The driving distance possible in run-flat modemay be reduced by extreme driving conditionsor maneuvers, or it can be increased through amoderate style of driving.
The driving distance possible in run-flat modeis counted from the moment the tire pressureloss warning appears in the multifunction dis-play.
You must not exceed a maximum designspeed of 50 mph (80 km/h).
When replacing one or all tires, please observethe following specifications for your vehicle'stires:
RSize
RType and
RThe "MOExtended" mark
If a tire has gone flat and cannot be replacedwith an MOExtended tire, a standard tire maybe used as a temporary measure. Make surethat you use the proper size and type (summeror winter tire).
Vehicles equipped with MOExtended tires arenot equipped with a TIREFIT kit at the factory.It is therefore recommended that you addition-ally equip your vehicle with a TIREFIT kit if youmount tires that do not feature run-flat charac-teristics, e.g. winter tires. A TIREFIT kit can beobtained from a qualified specialist workshop,for example.
Flat tire253
Breakdown assistance

Always make sure that neither you nor the bat-tery is electrostatically charged. A build-up ofelectrostatic charge can be caused, for exam-ple:
Rby wearing clothing made from syntheticfibers
Rdue to friction between clothing and seats
Rif you push or pull the battery across thecarpet or other synthetic materials
Rif you wipe the battery with a cloth
GWARNING
During the charging process, a battery pro-
duces hydrogen gas. If a short circuit occurs
or sparks are created, the hydrogen gas can
ignite. There is a risk of an explosion.
RMake sure that the positive terminal of a
connected battery does not come into
contact with vehicle parts.
RNever place metal objects or tools on a
battery.
RIt is important that you observe the
described order of the battery terminals
when connecting and disconnecting a bat-
tery.
RWhen jump-starting, make sure that the
battery poles with identical polarity are
connected.
RIt is particularly important to observe the
described order when connecting and dis-
connecting the jumper cables.
RNever connect or disconnect the battery
terminals while the engine is running.
GWARNING
Battery acid is caustic. There is a risk of
injury.
Avoid contact with skin, eyes or clothing. Do
not inhale any battery gases. Do not lean
over the battery. Keep children away from
batteries. Wash away battery acid immedi-
ately with plenty of clean water and seek
medical attention.
HEnvironmental note
Batteries contain pollutants.
It is illegal to dispose of
them with the household
rubbish. They must be col-
lected separately and dis-
posed of in an environmen-
tally responsible recycling
system.
Dispose of batteries in an
environmentally responsible
manner. Take discharged
batteries to a qualified spe-
cialist workshop or to a col-
lection point for used bat-
teries.
!Have the battery regularly checked at aqualified specialist workshop.
Comply with the service intervals in theMaintenance Booklet, or contact a qualifiedspecialist workshop for more information.
!Always have work on batteries carried outat a qualified specialist workshop.
Should it, in exceptional circumstances, beabsolutely necessary to disconnect the 12-volt battery yourself, please observe the fol-lowing:
RSecure the vehicle to prevent it from roll-ing away.
RSwitch off the ignition.
RDisconnect the negative terminal first andthen the positive terminal.
The transmission is locked in position]after disconnecting the battery.
After the work has been done, install thebattery and replace the cover of the positiveterminal clamp firmly.
Comply with safety precautions and take pro-tective measures when handling batteries.
Risk of explosion.
Fire, open flames and smoking areprohibited when handling the bat-tery. Avoid creating sparks.
258Battery (vehicle)
Breakdo wn assis tan ce

RMake sure that the positive terminal of a connected battery does not come into contact with
vehicle parts.
RNever place metal objects or tools on a battery.
RIt is important that you observe the described order of the battery terminals when connect-
ing and disconnecting a battery.
RWhen jump-starting, make sure that the battery poles with identical polarity are connected.
RIt is particularly important to observe the described order when connecting and disconnect-
ing the jumper cables.
RNever connect or disconnect the battery terminals while the engine is running.
GWARNING
A discharged battery can freeze at temperatures below freezing point. When jump-starting the
vehicle or charging the battery, gases can escape from the battery. There is a risk of an explo-
sion.
Allow the frozen battery to thaw out before charging it or jump-starting.
!Avoid repeated and lengthy starting attempts. Otherwise, the catalytic converter could bedamaged by the non-combusted fuel.
If the indicator/warning lamps do not light up at low temperatures, it is very likely that the dis-charged battery has frozen. In this case, you may neither charge the battery nor jump-start thevehicle. The service life of a thawed-out battery may be shorter. The starting characteristics canbe impaired, particularly at low temperatures. Have the thawed-out battery checked at a quali-fied specialist workshop.
Do not start the vehicle using a rapid charging device. If your vehicle's battery is discharged, theengine can be jump-started from another vehicle or from a donor battery using jumper cables.Observe the following points:
RThe battery is not accessible in all vehicles. If the other vehicle's battery is not accessible,jump-start the vehicle using a donor battery or a jump-starting device.
RYou may only jump-start the vehicle when the engine and exhaust system are cold.
RDo not start the engine if the battery is frozen. Let the battery thaw first.
ROnly jump-start from batteries with a 12 V voltage rating.
ROnly use jumper cables which have a sufficient cross-section and insulated terminal clamps.
RIf the battery is fully discharged, leave the battery that is being used to jump-start connectedfor a few minutes before attempting to start. This charges the battery slightly.
RMake sure that the two vehicles do not touch.
Make sure that:
RThe jumper cables are not damaged.
RBare parts of the terminal clamp do not come into contact with other metal parts while thejumper cables are connected to the battery.
RThe jumper cables cannot come into contact with parts which can move when the engine isrunning, such as the V-belt pulley or the fan.
XSecure the vehicle by applying the electric parking brake.
XShift the transmission to position].
XMake sure that the ignition is switched off. All indicator lamps in the instrument cluster mustbe off. When using the SmartKey, turn the SmartKey to position