ignition MERCEDES-BENZ SL CLASS 2019 Workshop Manual

Display messagesPossible causes/consequences andPPSolutions
Front-passengerFront-passengerAir Bag DisabledAir Bag DisabledSee Operator's Man‐See Operator's Man‐ualual
The front-passenger front air bag and front-passenger knee air bagare disabled during the journey, although:
Ran adult
or
Ra person of the corresponding stature is on the front-passengerseat
If additional forces are applied to the seat, the system may interpretthe occupant's weight as lower than it actually is.
GWARNING
The front-passenger front air bag and front-passenger knee air bagmay not be triggered in the event of an accident.
There is an increased risk of injury.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XSwitch the ignition off.
XHave the occupant on the front-passenger seat get out of thevehicle.
XKeep the seat unoccupied, close the front-passenger door andswitch on the ignition.
XObserve the PASSENGER AIR BAG indicator lamps in the centerconsole and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
Ra self-diagnosis is carried out. The PASSENGER AIR BAG OFFand PASSENGER AIR BAG ON indicator lamps must light upsimultaneously for approximately six seconds.
Rthe PASSENGER AIR BAG OFF indicator lamp must then lightup and remain lit after the self-diagnosis. If the indicator lampis on, OCS has disabled the front-passenger front air bag andfront-passenger knee bag (Ypage 48)
RtheFront-passenger Air Bag Enabled See Operator'sFront-passenger Air Bag Enabled See Operator'sManualManualorFront-passenger Air Bag Disabled See Oper‐Front-passenger Air Bag Disabled See Oper‐ator's Manualator's Manualdisplay messages must not appear in the mul-tifunction display
XWait for a period of at least 60 seconds until the necessary sys-tem checks have been completed.
XMake sure that the display messages do not appear in the multi-function display.
If these conditions are fulfilled, the front-passenger seat can beoccupied again. Whether the PASSENGER AIR BAG OFF or ON indi-cator lamp remains lit or goes out depends on how OCS classifiesthe occupant.
If the conditions are not fulfilled, the system is not operating cor-rectly.
XVisit a qualified specialist workshop immediately.
Observe the additional information on OCS (Ypage 48).
Displaymessages215
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
Front-passengerFront-passengerAir Bag EnabledAir Bag EnabledSee Operator's Man‐See Operator's Man‐ualual
The front-passenger front air bag and front-passenger knee air bagare enabled during the journey, although:
Ra child, a small adult or an object weighing less than the system'sweight threshold is located on the front-passenger seat
or
Rthe front-passenger seat is unoccupied
The system may detect objects or forces applying additional weighton the seat.
GWARNING
The front-passenger front air bag and the front-passenger knee bagmay be deployed unintentionally.
There is an increased risk of injury.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 146).
XSwitch the ignition off.
XOpen the front-passenger door.
XRemove the child and the child restraint system from the front-passenger seat.
XMake sure that there are no objects on the seat adding to theweight.The system might otherwise detect the additional weight andinterpret the seat occupant's weight as greater than it actually is.
XKeep the seat unoccupied, close the front-passenger door andswitch on the ignition.
XObserve the PASSENGER AIR BAG indicator lamps in the centerconsole and the multifunction display and check the following:
Seat unoccupied and ignition switched on:
Ra self-diagnosis is carried out. The PASSENGER AIR BAG OFFand PASSENGER AIR BAG ON indicator lamps must light upsimultaneously for approximately six seconds.
Rthe PASSENGER AIR BAG OFF indicator lamp must then lightup and remain lit after the self-diagnosis. If the indicator lampis on, OCS (Occupant Classification System) has disabled thefront-passenger front air bag and front-passenger knee air bag(Ypage 48)
RtheFront-passenger Air Bag Enabled See Operator'sFront-passenger Air Bag Enabled See Operator'sManualManualorFront-passenger Air Bag Disabled See Oper‐Front-passenger Air Bag Disabled See Oper‐ator's Manualator's Manualdisplay messages must not appear in the mul-tifunction display
XWait for a period of at least 60 seconds until the necessary sys-tem checks have been completed.
XMake sure that the display messages do not appear in the multi-function display.
If these conditions are fulfilled, the front-passenger seat can beoccupied again. Whether the PASSENGER AIR BAG OFF or ON indi-
216Displaymessages
On-b oard computer and displays

Display messagesPossible causes/consequences andPPSolutions
Y
Vario-Roof LoweringVario-Roof Lowering
The roof is not fully opened or closed. The hydraulics are depressur-ized.
XFully open or close the roof (Ypage 91).
Y
Open/Close Vario-Open/Close Vario-Roof CompletelyRoof Completely
The roof is not locked.
XPull over and stop the vehicle safely as soon as possible, payingattention to road and traffic conditions.
XPush or pull and hold the roof switch until the roof is fully open orclosed (Ypage 91).
Y
Start Engine SeeStart Engine SeeOperator's ManualOperator's Manual
The on-board voltage is too low.
XStart the engine.
XAfter approximately ten seconds, repeat the opening or closingprocedure (Ypage 91).
The roof has been opened and closed several times in a row. Theroof drive has been switched off automatically for safety reasons.
You can open and close the roof again after approximately tenminutes.
XSwitch off the ignition and turn it back on.
XRepeat the opening or closing procedure (Ypage 91).
Close Rear SideClose Rear SideWindowsWindowsYou leave the vehicle and at least one rear side window is open.
XClose the side windows (Ypage 88).

Warning and indicator lamps
General notes
Some systems carry out a self-diagnosis when the ignition is switched on. Therefore, some indi-cator and warning lamps may light up or flash temporarily. This behavior is non-critical. Theseindicator and warning lamps only indicate a malfunction if they light up or flash after starting theengine or whilst driving.
Safety
Seat belts
Warning/indicatorlamp
QQSignal type
Possible causes/consequences andPPSolutions

All other calls can be ended by pressing:
Rthevbutton on the multifunction steer-ing wheel
Ror the corresponding COMAND button forending a telephone call
iWhen a call is initiated, the audio systemis muted. The mobile phone is no longerconnected to COMAND. However, if youwant to use your mobile phone, do so onlywhen the vehicle is stationary and in a safelocation.
Vehicle Health Check
With the Vehicle Health Check, the CustomerAssistance Center can provide improved sup-port for problems with your vehicle. During anexisting call, vehicle data is transferred to theCustomer Assistance Center. The customerservice representative can use the receiveddata to decide what kind of assistance isrequired. You are then, for example, guided tothe nearest Mercedes-Benz Service Center ora recovery vehicle is called.
If vehicle data needs to be transferred duringan MB Info call or a Roadside Assistance call,this is initiated by the Customer AssistanceCenter. You will see theRoadside Assis‐Roadside Assis‐tance Connectedtance Connectedmessage in the COMANDdisplay. If the Vehicle Health Check can bestarted, theRequest for vehicle diagno‐Request for vehicle diagno‐sis received. Start vehicle diagno‐sis received. Start vehicle diagno‐sis?sis?message appears in the display.
XConfirm the message withYesYes.
XWhen theVehicle Diagnosis: PleaseVehicle Diagnosis: Pleasestart ignition.start ignition.message appears, turnthe SmartKey to positionHin the ignitionlock (Ypage 126).
XWhen thePlease follow the instruc‐Please follow the instruc‐tions received by phone and movetions received by phone and moveyour vehicle to a safe positionyour vehicle to a safe positionmes-sage appears, follow the customer servicerepresentative's instructions.The message in the display disappears.
If you selectCancelCancelthe Vehicle HealthCheck is canceled completely.
The vehicle operating state check begins.You will see theVehicle diagnosisVehicle diagnosisactivated.activated.message.
When the check is completed, theSendSendvehicle diagnostics data (Voice con‐vehicle diagnostics data (Voice con‐nection may be interrupted duringnection may be interrupted during
data transfer)data transfer)message appears. The vehi-cle data can now be sent to the CustomerAssistance Center.
XPressOKOKto confirm the message.The voice connection with the CustomerAssistance Center is terminated.
You will see theVehicle Diagnosis:Vehicle Diagnosis:Transferring data...Transferring data...message.
The vehicle data is sent to the CustomerAssistance Center.
Depending on what the customer service rep-resentative agreed with you, the voice connec-tion is re-established after the transfer is com-plete. If necessary, you will be contacted at alater time by another means, e.g. by e-mail orphone.
Another function of the Vehicle Health Checkis the transfer of service data to the CustomerAssistance Center. If a service is overdue, theCOMAND display shows a message about vari-ous special offers at your workshop.
USA only: this information can also be calledup under "Owners Online" at http://www.mbusa.com.
Information on the data stored in the vehicle(Ypage 29).
Information on Roadside Assistance(Ypage 26).
Garage door opener
General notes
The HomeLink®garage door opener integratedin the rear-view mirror allows you to operateup to three different door and gate systems.
Use the integrated garage door opener only ongarage doors that:
Rhave safety stop and reverse features and
Rmeet current U.S. federal safety standards
Once programed, the integrated garage dooropener in the rear-view mirror will assume thefunction of the garage door system's remotecontrol. Please also read the operating instruc-tions for the garage door system.
When programming a garage door opener,park the vehicle outside the garage. Do notrun the engine while programming.
Certain garage door drives are incompatiblewith the integrated garage door opener. If youhave difficulty programing the integrated
Features259
Sto wage an d features
Z

Engine compartment
Hood
Important safety notes
GWARNING
If the hood is unlatched, it may open up
when the vehicle is in motion and block your
view. There is a risk of an accident.
Never unlatch the hood while driving. Before
every trip, ensure that the hood is locked.
GWARNING
When opening and closing the hood, it may
suddenly fall into the closed position. There
is a risk of injury to persons within range of
movement of the hood.
Open and close the hood only when no one
is within its range of movement.
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.
If you need to do any work inside the engine
compartment:
Rswitch off the ignition
Rnever reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
Rremove jewelry and watches
Rkeep items of clothing and hair, for exam-
ple, away from moving parts
To ensure the flow of fresh air through the airvents into the vehicle interior, please observethe following notes: (Ypage 122)
Opening the hood
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
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.
!Make sure that the windshield wipers arenot folded away from the windshield. Youcould otherwise damage the windshield wip-ers or the hood.
XMake sure that the windshield wipers areturned off.
XPull release leverCon the hood.The hood is released.
Engine compartment265
Maintenance and care
Z

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 266).
Further information on engine oil(Ypage 323).
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.
Engine compartment267
Maintenance and care
Z

If you need to do any work inside the engine
compartment:
Rswitch off the ignition
Rnever reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
Rremove jewelry and watches
Rkeep items of clothing and hair, for exam-
ple, away from moving parts
GWARNING
The cooling system is pressurized, particu-
larly 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 protec-
tive eyewear when opening. Open the cap
slowly to release pressure.
Example
XPark the vehicle on a level surface.
Only check the coolant level when the vehi-cle is on a level surface and the engine hascooled down.
XTurn the SmartKey to positionHin the igni-tion lock (Ypage 126).
On vehicles with KEYLESS-GO, press theStart/Stop button twice (Ypage 126).
XCheck the coolant temperature gage in themultifunction display.The coolant temperature must be below158 ‡ (70 †).
XTurn the SmartKey to position

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 service displays
XPress thevor8button on the steer-ing wheel.
Showing service displays
XSwitch on the ignition.
XPressYoreon the steering wheelto select theServ.Serv.menu.
XPresscordto select theASSYSTASSYSTPLUSPLUSsubmenu and confirm by pressing thevbutton.The service due date appears in the multi-function display.
Information about Service
Resetting the ASSYST PLUS service
interval display
!If the ASSYST PLUS service interval dis-play has been inadvertently reset, this set-ting can be corrected at a qualified special-ist workshop.
Have service work carried out as describedin the Maintenance Booklet. This may other-wise lead to increased wear and damage tothe major assemblies or the vehicle.
A qualified specialist workshop, e.g. an author-ized Mercedes-Benz Center, will reset theASSYST PLUS service interval display after theservice work has been carried out. You canalso obtain further information on mainte-nance work, for example.
Special service requirements
The specified maintenance interval takes onlythe normal operation of the vehicle intoaccount. Service work will need to be per-formed more often if the vehicle is operatedunder arduous conditions or increased loads.
The ASSYST PLUS service interval display isonly an aid. The driver of the vehicle is respon-sible for whether service work will need to beperformed more frequently than required as aresult of the actual operating conditionsand/or loads.
Examples of arduous operating conditions:
Rregular city driving with frequent intermedi-ate stops
Rthe vehicle is primarily used to travel shortdistances
Rfrequent use in mountainous terrain or onpoor road surfaces
Rthe engine is often left idling for long peri-ods
Rparticularly dusty conditions, or if air-recir-culation mode is frequently used
In these or similar operating conditions, havethe interior filter, air filter, engine oil and oil fil-ter, for example, changed more frequently.Under arduous operating conditions, the tiresmust be checked more often. Further informa-tion can be obtained at a qualified specialistworkshop.
Driving abroad
An extensive Mercedes-Benz Service networkis also available in other countries. You canobtain further information from any authorizedMercedes-Benz Service Center.
Care
Notes on care
HEnvironmental note
Dispose of empty packaging and cleaning
cloths in an environmentally responsible
manner.
!When cleaning your car, do not use:
Rdry, coarse or hard cloths
Rabrasive cleaning agents
270Care
Maintenance and care

a decorative film when the decorative film isremoved.
iHave work or repairs on decorative filmcarried out at a qualified specialist work-shop. Mercedes-Benz recommends that youuse an authorized Mercedes-Benz Center forthis purpose.
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.
!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.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 circumstancesprevent 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.
274Care
Maintenance and care