ignition MERCEDES-BENZ CLA 2019 Workshop Manual

Example: engine oil cap
XTurn capCcounter-clockwise and remove it.
XAdd engine oil.If the oil level is at or below the MIN mark onthe oil dipstick, add 1.1 US qt (1.0 liter) ofengine oil.
XReplace capCon the filler neck and turnclockwise.Ensure that the cap locks into place securely.
XCheck the oil level again with the oil dipstick(Ypage 261).
Further information on engine oil (Ypage 322).
Checking and adding other service
products
Checking coolant level
GWARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scalded if hot coolant sprays out.
There is a risk of injury.
Let the engine cool down before you open the
cap. Wear protective gloves and protective
eyewear when opening. Open the cap slowly
to release pressure.
!The coolant level must only be checked andcorrected when the engine has cooled down(coolant temperature under 104 ‡ (40 †).Checking the coolant level when the coolanttemperature is over 104‡(40 †) can lead todamage to the engine or the engine coolingsystem.
XPark the vehicle on a level surface.
Only check the coolant level when the vehicleis on a level surface and the engine has cooleddown.
XTurn the SmartKey to positionHin the igni-tion lock (Ypage 123).
XCheck the coolant temperature display in theinstrument cluster.The coolant temperature must be below104 ‡ (40 †).
XTurn the SmartKey to positionZ(Ypage 123) in the ignition lock .
XSlowly turn capCcounter-clockwise and torelieve excess pressure.
XTurn capCfurther counter-clockwise andremove it.If the coolant is at the level of marker bar

GWARNING
Windshield washer concentrate could ignite if
it comes into contact with hot engine compo-
nents or the exhaust system. There is a risk of
fire and injury.
Make sure that no windshield washer con-
centrate is spilled next to the filler neck.
XTo open:pull capCupwards by the tab.
XAdd the premixed washer fluid.
XTo close:press capConto the filler neckuntil it engages.
If the washer fluid level drops below the recom-mended minimum of 1 liter, a message appearsin the multifunction display prompting you toadd washer fluid (Ypage 218).
Further information on windshield washer fluid/antifreeze (Ypage 323).
ASSYST PLUS
Service message
The ASSYST PLUS service interval displayinforms you of the next service due date.
You can find information on the type of serviceand service intervals in the Maintenance Book-let.
You can obtain further information from anauthorized Mercedes-Benz Center or athttp://www.mbusa.com (USA only).
iThe ASSYST PLUS service interval displaydoes not show any information on the engineoil level. Observe the notes on the engine oillevel (Ypage 261).
The multifunction display shows a service mes-sage for several seconds, e.g.:
RService A in .. daysService A in .. days
RService A dueService A due
RService A overdue by .. daysService A overdue by .. days
Depending on the operating conditions of thevehicle, the remaining time or distance until thenext service due date is displayed.
The letterAAorBB, possibly in connection with anumber or another letter, indicates the type ofservice.AAstands for a minor service andBBfor amajor service.
You can obtain further information from anauthorized Mercedes-Benz Center.
The ASSYST PLUS service interval display doesnot take into account any periods of time duringwhich the battery is disconnected.
Maintaining the time-dependent service sched-ule:
XNote down the service due date displayed inthe multifunction display before disconnect-ing the battery.
or
XAfter reconnecting the battery, subtract thebattery disconnection periods from the ser-vice date shown on the display.
Hiding a service message
XPress thevor8button on the steeringwheel.
Displaying service messages
XSwitch on the ignition.
XPress theYorebutton to select theServ.Serv.menu.
XPress thecordbutton to select theASSYSTASSYSTPLUSPLUSsubmenu and confirm by press-ing thevbutton.The service due date appears in the multi-function display.
264ASSYST PLUS
Maintenance and care

To clean, use plenty of water and a mild cleaningagent without additional or abrasive products,e.g. use a car shampoo approved for Mercedes-Benz.
XDry vehicles covered with film using a soft,absorbent cloth after every wash.Water marks could otherwise form.
Scratches, corrosive deposits, areas affected bycorrosion and damage caused by inadequatecare cannot always be completely repaired. Insuch cases, visit a qualified specialist workshop.
XRemove dirt immediately, where possible,while avoiding rubbing too hard.The decorative film may be irreparably dam-aged.
XSoak insect remains with insect remover andrinse off the treated areas afterwards.
XSoak bird droppings with water and rinse offthe treated areas afterwards.
The Paint Cleaner cleaning product, which hasbeen approved and recommended byMercedes-Benz, should be used when dirt haspenetrated the decorative film surface or thedecorative film has become dull.
The manufacturer can provide you with infor-mation on special care and cleaning products.
Laminated surfaces may exhibit optical differ-ences to surfaces which were not protected by adecorative film when the decorative film isremoved.
iHave work or repairs on decorative film car-ried out at a qualified specialist workshop.Mercedes-Benz recommends that you use anauthorized Mercedes-Benz Center for thispurpose.
Cleaning the vehicle parts
Cleaning the wheels
GWARNING
The water jet from a circular jet nozzle (dirt
blasters) can cause invisible exterior damage
to the tires or chassis components. Compo-
nents damaged in this way may fail unexpect-
edly. 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 period oftime directly after cleaning, particularly aftercleaning 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. Byheating up the brakes, the brake discs andpads dry. The vehicle can then be parked for along period of time.
Cleaning the windows
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.
!Only fold the windshield wipers away fromthe windshield when vertical. Otherwise, youwill damage the hood.
!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. Thereis otherwise a risk of damaging the windows.
!Clean the water drainage channels of thewindshield and the rear window at regularintervals. Deposits such as leaves, petals andpollen may under certain circumstances pre-vent water from draining away. This can leadto corrosion damage and damage to elec-tronic components.
XClean the inside and outside of the windowswith a damp cloth and a cleaning product thatis recommended and approved by Mercedes-Benz.
268Care
Maintenance and care

Cleaning 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.
!Only fold the windshield wipers away fromthe windshield when vertical. Otherwise, youwill damage the hood.
!Do not pull the wiper blade. Otherwise, thewiper blade could be damaged.
!Do not clean wiper blades too often and donot rub them too hard. Otherwise, the graph-ite coating could be damaged. This couldcause wiper noise.
!Hold the wiper arm securely when foldingback. The windshield could be damaged if thewiper arm smacks against it suddenly.
XFold the windshield wiper arms away from thewindshield.
XCarefully clean the wiper blades with a dampcloth.
XFold the windshield wiper arms back againbefore switching on the ignition.
Cleaning the exterior lighting
!Only use cleaning agents or cleaning clothswhich are suitable for plastic light lenses.Unsuitable cleaning agents or cleaning clothscould scratch or damage the plastic light len-ses.
XClean the plastic lenses of the exterior lightswith a wet sponge and a mild cleaning agent,e.g. Mercedes-Benz car shampoo or cleaningcloths.
Cleaning the mirror turn signals
!Only use cleaning agents or cleaning clothsthat are suitable for plastic lenses. Unsuitablecleaning agents or cleaning cloths couldscratch or damage the plastic lenses of themirror turn signals.
XClean the plastic lenses of the mirror turn sig-nals in the exterior mirror housing using a wetsponge and mild cleaning agent, e.g.Mercedes-Benz car shampoo or cleaningcloths.
Cleaning the sensors
!If you clean the sensors with a powerwasher, make sure that you keep a distanceof at least 11.8 in(30 cm) between the vehicleand the power washer nozzle. Informationabout the correct distance is available fromthe equipment manufacturer.
XClean sensorsCof the driving systems withwater, car shampoo and a soft cloth.
Cleaning the rear view camera
!Do not clean the camera lens and the areaaround the rear view camera with a powerwasher.
Care269
Maintenance and care
Z

plenty of clean water and seek medical atten-
tion.
HEnvironmental note
Batteries contain pollutants.
It is illegal to dispose of them
with the household rubbish.
They must be collected sep-
arately and disposed of in an
environmentally 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 batter-
ies.
!Have the battery regularly checked at aqualified specialist workshop.
Comply with the service intervals in the Main-tenance Booklet, or contact a qualified spe-cialist workshop for more information.
!You should have all work involving the bat-tery carried out at a qualified specialist work-shop. In the exceptional case that it is neces-sary for you to disconnect the battery your-self, make sure that:
Rswitch off the engine and remove theSmartKey. On vehicles with KEYLESS-GO,make sure that the ignition is switched off.Check that all the indicator lamps in theinstrument cluster are off. Otherwise, elec-tronic components, such as the alternator,may be damaged.
Ryou first remove the negative terminalclamp and then the positive terminalclamp. Never swap the terminal clamps.Otherwise, the vehicle's electronic systemmay be damaged.
Rin vehicles with automatic transmission,the transmission is locked in position]after the battery is disconnected. The vehi-cle is secured against rolling away. You canthen no longer move the vehicle.
The battery and the cover of the positive ter-minal clamp must be installed securely duringoperation.
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.
Battery acid is caustic. Avoid contactwith skin, eyes or clothing.
Wear suitable protective clothing,especially gloves, apron and face-guard.
Rinse any acid spills immediatelywith clear water. Contact a physicianif necessary.
Wear eye protection.
Keep children away.
Observe this Operator's Manual.
For safety reasons, Mercedes-Benz recom-mends that you only use batteries which havebeen tested and approved for your vehicle byMercedes-Benz. These batteries provideincreased impact protection to prevent vehicleoccupants from suffering acid burns should thebattery be damaged in the event of an accident.
In order for the battery to achieve the maximumpossible service life, it must always be suffi-ciently charged.
Like other batteries, the vehicle battery maydischarge over time if you do not use the vehicle.In this case, have the battery disconnected at aqualified specialist workshop. You can alsocharge the battery with a charger recommendedby Mercedes-Benz. Contact a qualified special-ist workshop for further information.
Have the battery condition of charge checkedmore frequently if you use the vehicle mainly forshort trips or if you leave it standing idle for alengthy period. Consult a qualified specialistworkshop if you wish to leave your vehicleparked for a long period of time.
280Battery (vehicle)
Breakdown assistance

If the indicator/warning lamps do not light up in the instrument cluster at low temperatures, it is verylikely that the discharged battery has frozen. In this case you may neither jump-start the vehicle norcharge the battery. Let the battery thaw first. The service life of a thawed-out battery may be shorter.The starting characteristics can be impaired, particularly at low temperatures. Have the thawed-outbattery checked at a qualified 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 second 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 second 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 that are not damaged and have a sufficient cross-section and insulatedterminal clamps.
RMake sure that the two vehicles do not touch.
Make sure that:
RThe jumper cables are not damaged.
RNon-insulated parts of the terminal clamps do not come into contact with other metal parts whilethe jumper cables are connected to the battery.
RThe jumper cables cannot come into contact with parts that can move when the engine is running,such as the V-belt pulley or the fan.
XSecure the vehicle by applying the electric parking brake.
XShift the transmission to position].
XTurn the SmartKey to positionZin the ignition lock and remove it.
XSwitch off all electrical consumers, e.g. rear window defroster, lighting, etc.
XOpen the hood.
Jump-starting283
Breakdown assistance
Z

!When Active Brake Assist, Active DistanceAssist DISTRONIC or the HOLD function isactivated, the vehicle brakes automatically incertain situations.
To avoid damage to the vehicle, deactivatethese systems in the following or similar sit-uations:
Rwhen towing the vehicle
Rin the car wash
!Make sure that the electric parking brake isreleased. If the electric parking brake is faulty,visit a qualified specialist workshop.
!Only secure the tow rope or tow bar at thetowing eyes. Otherwise, the vehicle could bedamaged.
!Do not use the towing eyes for recovery pur-poses as this could damage the vehicle. If indoubt, recover the vehicle with a crane.
!When towing, pull away slowly andsmoothly. If the tractive power is too high, thevehicles could be damaged.
!The vehicle can be towed a maximum of30 miles (50km). The towing speed of 30 mph(50km/h) must not be exceeded.
If the vehicle has to be towed more than30 miles (50km), the front axle must be raisedor the entire vehicle raised and transported.
!Do not tow with sling-type equipment. Thiscould damage the vehicle.
!When towing away vehicles with KEYLESS-GO, use the key instead of the Start/Stopbutton. The automatic transmission may oth-erwise shift to position]when you open thedriver's or front-passenger door, which coulddamage the transmission.
!Vehicles with automatic transmission mustnot be started by tow-starting. This could oth-erwise damage the transmission.
It is better to have the vehicle transported thanto have it towed away.
If the vehicle can no longer be driven because ofan accident or breakdown, you have the follow-ing options:
RTransporting the vehicle.
As a rule, you should have the vehicle trans-ported.
RTowing the vehicle with a tow rope or tow bar.
Only tow the vehicle in exceptional cases.
The battery must be connected and charged.Otherwise, you:
Rcannot turn the SmartKey to positionHinthe ignition lock.
Rcannot release the electric parking brake.
Rcannot shift the transmission to position\\.
The function of the electric parking brake andthe parking lock is dependent on the on-boardvoltage.
If the on-board voltage is low or if there is a sys-tem malfunction:
Rthe electric parking brake may not be appliedin certain circumstances, or
Rit may no longer be possible to shift the trans-mission to position]
Switch off non-essential consumers, e.g. theradio.
Deactivate the automatic locking feature beforethe vehicle is towed (Ypage 189). You couldotherwise be locked out when pushing or towingthe vehicle.
Installing/removing the towing eye
Installing the towing eye
The brackets for the screw-in towing eye arelocated in the bumpers. They are at the rear andat the front, under coversC.
XRemove the towing eye from the stowagespace.
Towing and tow-starting285
Breakdown assistance
Z

The towing eye is located with the vehicle toolkit under the cargo compartment floor(Ypage 274).
Vehicles with the TIREFIT kit: the towing eye isbeneath the tire inflation compressor(Ypage 274).
XPress the mark on coverCinwards in thedirection of the arrow.
XTake coverCoff the opening.
XScrew in the towing eye clockwise to the stop.
Removing the towing eye
XUnscrew and remove the towing eye.
XAttach coverCto the bumper and press untilit engages.
XPlace the towing eye in the stowage wellbeneath the cargo compartment floor in thecargo compartment (Ypage 274).
XVehicles with the TIREFIT kit: put back the tireinflation compressor (Ypage 274).
Towing the vehicle with the front axle
raised
Observe the important safety notes when tow-ing your vehicle with the front axle raised(Ypage 284).
Only vehicles without 4MATIC can be towedwith the front axle raised.
!Vehicles with 4MATIC must not be towedwith either the front or the rear axle raised, asdoing so will damage the transmission.
Vehicles with 4MATIC may either be towed awaywith both axles on the ground or be loaded upand transported.
!The ignition must be switched off if the vehi-cle is being towed with the front axle raised.
Otherwise, ESP®may intervene and damagethe brake system.
XOn vehicles with KEYLESS-GO or the KEY-LESS-GO start function:you must use theSmartKey instead of the Start/Stop button(Ypage 124).
XMake sure that the vehicle is stationary.
XTurn the SmartKey to positionHin the igni-tion lock.
XWhen the vehicle is stationary, depress thebrake pedal and keep it depressed.
XShift the automatic transmission to position].
XRelease the brake pedal.
XRelease the electric parking brake.
XSwitch off the automatic locking(Ypage 189).
XSwitch on the hazard warning lamps(Ypage 103).
XTurn the SmartKey in the ignition lock to posi-tionZand leave the SmartKey in the ignitionlock.
Towing a vehicle with both axles on
the ground
It is important that you observe the safetyinstructions when towing away your vehicle(Ypage 284).
XOn vehicles with KEYLESS-GO or the KEY-LESS-GO start function:you must use theSmartKey instead of the Start/Stop button(Ypage 124).
The automatic transmission automatically shiftsto position]when you open the driver's orfront-passenger door or when you remove theSmartKey from the ignition lock. In order toensure that the automatic transmission stays inposition\\when towing away the vehicle, youmust observe the following points:
XMake sure that the vehicle is stationary.
XTurn the SmartKey to positionHin the igni-tion lock.
XDepress and hold the brake pedal.
XShift the automatic transmission to position\\.
XLeave the SmartKey in positionHin the igni-tion lock.
XRelease the brake pedal.
XRelease the electric parking brake.
XSwitch on the hazard warning lamps(Ypage 103).
iIn order to signal a change of direction whentowing the vehicle with the hazard warninglamps switched on, use the combinationswitch as usual. In this case, only the indicatorlamps for the direction of travel flash. Afterresetting the combination switch, the hazardwarning lamp starts flashing again.
286Towing and tow-starting
Breakdown assistance

wise, components or systems could be dam-aged.
!Make sure that no moisture can enter thefuse box when the cover is open.
!When closing the cover, make sure that it islying correctly on the fuse box. Moisture seep-ing in or dirt could otherwise impair the oper-ation of the fuses.
The fuses in your vehicle serve to close downfaulty circuits. If a fuse blows, all the compo-nents on the circuit and their functions stopoperating.
Blown fuses must be replaced with fuses of thesame rating, which you can recognize by thecolor and value. The fuse ratings are listed in thefuse allocation chart.
The fuse allocation chart is in the fuse box in thefront-passenger footwell (Ypage 289).
If a newly inserted fuse also blows, have thecause traced and rectified at a qualified special-ist workshop, e.g. an authorized Mercedes-BenzCenter.
Before changing a fuse
XSecure the vehicle against rolling away(Ypage 142).
XSwitch off all electrical consumers.
XVehicles without KEYLESS-GO:remove theSmartKey from the ignition lock.
XVehicles with KEYLESS-GO start-functionor KEYLESS-GO:open the driver's door.The vehicle electronics are now in positionZ. This corresponds to the SmartKey beingremoved from the ignition.
The fuses are located in various fuse boxes:
RFuse box in the engine compartment on theleft-hand side of the vehicle, when viewed inthe direction of travel
RFuse box in the front-passenger footwell
The fuse allocation chart is on the fuse box in thefront-passenger footwell (Ypage 289).
Fuse box in the engine compartment
GWARNING
When the hood is open and the windshield
wipers are set in motion, you can be injured by
the wiper linkage. There is a risk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood.
XOpen the hood.
XUse a dry cloth to remove any moisture fromthe fuse box.
XTo open:open clampsD.
XFold up coverCin the direction of the arrowand remove it.
XTo close:check whether the seal is lying cor-rectly in coverC.
XInsert coverCat the back into openings

a corresponding warning message will appear inthe multifunction display.
You can recognize the tire pressure loss warningby theRun Flat Indicator Active PressRun Flat Indicator Active Press'OK''OK'totoRestartRestartmessage in the multifunctiondisplay in theServ.Serv.menu. Information on themessage display can be found in the "Restartingthe tire pressure loss warning" section(Ypage 297).
Important safety notes
The tire pressure warning system does not warnyou of an incorrectly set tire pressure. Observethe notes on the recommended tire pressure(Ypage 293).
The tire pressure loss warning does not replacethe need to regularly check the tire pressure. Aneven loss of pressure on several tires at thesame time cannot be detected by the tire pres-sure loss warning system.
The tire pressure monitor is not able to warn youof a sudden loss of pressure, e.g. if the tire ispenetrated by a foreign object. In the event of asudden loss of pressure, bring the vehicle to ahalt by braking carefully. Avoid abrupt steeringmovements.
The function of the tire pressure loss warningsystem is limited or delayed if:
Rsnow chains are mounted on your vehicle'stires.
Rroad conditions are wintry.
Ryou are driving on sand or gravel.
Ryou adopt a very sporty driving style (corner-ing at high speeds or driving with high rates ofacceleration).
Ryou are driving with a heavy load (in the vehi-cle or on the roof)
Restarting the tire pressure loss warn-
ing system
Restart the tire pressure loss warning system ifyou have:
Rchanged the tire pressure
Rchanged the wheels or tires
Rmounted new wheels or tires
XBefore restarting, make sure that the tirepressures are set properly on all four tires forthe respective operating conditions.
The recommended tire pressure can be foundon the Tire and Loading Information placard
on the B-pillar. Additionally, a tire pressuretable is attached to the fuel filler flap. The tirepressure loss warning system can only givereliable warnings if you have set the correcttire pressure. If an incorrect tire pressure isset, these incorrect values will be monitored.
XAlso observe the notes in the section on tirepressures (Ypage 293).
XMake sure that the SmartKey is in positionHin the ignition lock (Ypage 123).
XPressYoreon the steering wheel toselect theServ.Serv.menu.
XPress thecordbutton to selectTire PressureTire Pressure.
XPress thevbutton.TheRun Flat Indicator Active PressRun Flat Indicator Active Press'OK' to Restart'OK' to Restartmessage appears in themultifunction display.
If you wish to confirm the restart:
XPress thevbutton.TheTire Pressure Now OK?Tire Pressure Now OK?messageappears in the multifunction display.
XPress thecordbutton to selectYesYes.
XPress thevbutton.TheRun Flat Indicator RestartedRun Flat Indicator Restartedmes-sage appears in the multifunction display.
After a teach-in period, the tire pressure losswarning system will monitor the set tire pres-sures of all four tires.
If you wish to cancel the restart:
XPress the8button.
or
XIf theTire Pressure Now OK?Tire Pressure Now OK?messageappears, press thecordbutton toselectCancelCancel.
XPress thevbutton.The tire pressure values stored at the lastrestart will continue to be monitored.
Tire pressure monitor (Canada only)
General notes
If a tire pressure monitor is installed, the vehi-cle's wheels have sensors that monitor the tirepressures in all four tires. The tire pressure mon-itor warns you if the pressure drops in one ormore of the tires. The tire pressure monitor onlyfunctions if the corresponding sensors areinstalled in all wheels.
Tire pressure297
Wheels and tires
Z