stop start MERCEDES-BENZ CLA 2019 Service Manual

Tires
Display messagesPossible causes/consequences andPPSolutions
CheckCheckTireTirePressurePressureSoonSoonCanada only:
The tire pressure loss warning system has detected a significant lossin pressure.
A warning tone also sounds.
Possible causes:
Ryou have changed the positions of the wheels and tires or installednew wheels and tires
Rthe tire pressure in one or more tires has dropped
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed increase.
Rthey may wear excessively and/or unevenly, which may greatlyimpair tire traction.
Rthe driving characteristics, as well as steering and braking, may begreatly impaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or brakingmaneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 142).
XCheck the tires and, if necessary, follow the instructions for a flattire (Ypage 274).
XCheck the tire pressures and, if necessary, correct the tire pressure.
XRestart the tire pressure loss warning system when the tire pres-sure is correct (Ypage 297).
CheckCheckTireTirePressurePressureThen Restart RunThen Restart RunFlat IndicatorFlat Indicator
Canada only:
The tire pressure loss warning system generated a display messageand has not been restarted since.
XSet the correct tire pressure in all four tires.
XRestart the tire pressure loss warning system (Ypage 297).
Run Flat IndicatorRun Flat IndicatorInoperativeInoperativeCanada only:
The tire pressure loss warning system is faulty.
XVisit a qualified specialist workshop.
PleasePleaseCorrectCorrectTireTirePressurePressureUSA only:
The tire pressure is too low in at least one of the tires, or the tirepressure difference between the wheels is too great.
XCheck the tire pressures at the next opportunity (Ypage 297).
XIf necessary, correct the tire pressure.
XRestart the tire pressure monitor (Ypage 300).
Displaymessages213
On-b oard computer and displays
Z

Display messagesPossible causes/consequences andPPSolutions
Check TiresCheck TiresUSA only:
The tire pressure in one or more tires has dropped significantly. Thewheel position appears in the multifunction display.
A warning tone also sounds.
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed increase.
Rthey may wear excessively and/or unevenly, which may greatlyimpair tire traction.
Rthe driving characteristics, as well as steering and braking, may begreatly impaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or brakingmaneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 142).
XCheck the tires and, if necessary, follow the instructions for a flattire (Ypage 274).
XCheck the tire pressure (Ypage 297).
XIf necessary, correct the tire pressure.
Warning Tire Mal‐Warning Tire Mal‐functionfunctionUSA only:
The tire pressure in one or more tires has dropped suddenly. The wheelposition appears in the multifunction display.
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 lose control of the vehicle
Rcontinued driving with a flat tire will cause excessive heat build-upand possibly a fire
There is a risk of an accident.
XStop the vehicle without making any sudden steering or brakingmaneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 142).
XCheck the tires and, if necessary, follow the instructions for a flattire (Ypage 274).
TireTirePress.Press.MonitorMonitorCurrently Unavaila‐Currently Unavaila‐bleble
USA only:
Because there is interference from a strong source of radio waves, nosignals from the tire pressure sensors are detected. The tire pressuremonitor is temporarily malfunctioning.
XDrive on.The tire pressure monitor restarts automatically as soon as theproblem has been resolved.
214Displaymessages
On-b oard computer and displays

GWARNING
Functions relevant to safety are restricted or
no longer available if:
Rthe engine is not running
Rthe brake system or the power steering is
malfunctioning
Rthere is a malfunction in the power supply
or the vehicle's electrical system
When your vehicle is towed away or towed
started, you may require considerably more
effort to steer and brake. There is a risk of an
accident.
In such cases, use a tow bar. Before being
towed away or tow started, make sure the
steering moves freely.
XPull oil dipstickCout of the dipstick guidetube.
XWipe off oil dipstickC.
XSlowly slide oil dipstickCinto the guide tubeto the stop, and take it out again.If the level is between MIN mark

XMake sure that the engine cannot be startedvia your smartphone (Ypage 124).
XMake sure that the passengers are not endan-gered as they do so. Make sure that no one isnear the danger area while a wheel is beingchanged. Anyone who is not directly assistingin the wheel change should, for example,stand behind the barrier.
XGet out of the vehicle. Pay attention to trafficconditions when doing so.
XClose the driver's door.
MOExtended tires (tires with run-flat
properties)
General notes
With MOExtended tires (tires with run flat char-acteristics), you can continue to drive your vehi-cle even if there is a total loss of pressure in oneor more tires. The affected tire must not showany clearly visible damage.
You can recognize a 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 305).
MOExtended tires may be used only in conjunc-tion with an activated tire pressure loss warningsystem (Canada only) or tire pressure monitor(USA only).
If a pressure loss warning message appearsin the multifunction display:
Robserve the instructions in the display mes-sages (Ypage 213).
Rcheck the tire for damage
Rif driving on, observe the following notes
The driving distance possible in run-flat mode isapproximately 50 miles (80 km) when the vehi-cle is partially laden. When the vehicle is fullyladen it is approximately 19 miles (30 km).
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 mode iscounted from the moment the tire pressure losswarning appears in the multifunction display.
You must not exceed a maximum speed of50 mph (80 km/h).
When replacing one or all tires, please observethe following specifications for your vehicle'stires:
Rsize
Rtype and
Rthe "MOExtended" marking
If a tire has gone flat and cannot be replacedwith a MOExtended tire, a standard tire may beused as a temporary measure. Make sure thatyou use the proper size and type (summer orwinter tire).
Vehicles equipped with MOExtended tires arenot equipped with a TIREFIT kit at the factory. Itis therefore recommended that you additionallyequip your vehicle with a TIREFIT kit if you mounttires that do not feature run-flat properties, e.g.winter tires. A TIREFIT kit may be obtained froma qualified specialist workshop.
Important safety notes
GWARNING
When driving in emergency mode, the driving
characteristics deteriorate, e.g. when corner-
ing, accelerating quickly and when braking.
There is a risk of an accident.
Do not exceed the stated maximum speed.
Avoid abrupt steering and driving maneuvers,
and driving over obstacles (curbs, potholes,
off-road). This applies in particular to a laden
vehicle.
Stop driving in emergency mode if:
Ryou hear banging noises.
Rthe vehicle starts to shake.
Ryou see smoke and smell rubber.
RESP®is intervening constantly.
Rthere are tears in the sidewalls of the tire.
After driving in emergency mode, have the
wheel rims checked at a qualified specialist
workshop with regard to their further use. The
defective tire must be replaced in every case.
Flat tire275
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

Information on tire pressures is displayed in themultifunction display. After a few minutes ofdriving, the current tire pressure of each tire isshown in theServ.Serv.menu of the multifunctiondisplay, see illustration (example).
For information on the message display, refer tothe "Checking the tire pressure electronically"section (Ypage 299).
Important safety notes
GWARNING
Each tire, including the spare (if provided),
should be checked at least once every two
weeks when cold and inflated to the pressure
recommended by the vehicle manufacturer
on the Tire and Loading Information placard
on the driver's door B-pillar or the tire pres-
sure label on the inside of the fuel filler flap. If
your vehicle has tires of a different size than
the size indicated on the Tire and Loading
Information placard or, if available, the tire
pressure label, you should determine the
proper tire pressure for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire pres-
sure telltale when one or more of your tires
are significantly underinflated. Accordingly,
when the low tire pressure telltale lights up,
you should stop and check your tires as soon
as possible, and inflate them to the proper
pressure. Driving on a significantly underin-
flated tire causes the tire to overheat and can
lead to tire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehicle's
handling and stopping ability. Please note that
the TPMS is not a substitute for proper tire
maintenance, and it is the driver's responsi-
bility to maintain correct tire pressure, even if
underinflation has not reached the level to
trigger illumination of the TPMS low tire pres-
sure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when
the system is not operating properly. The
TPMS malfunction indicator is combined with
the low tire pressure telltale. When the sys-
tem detects a malfunction, the warning lamp
will flash for approximately a minute and then
remain continuously illuminated. This
sequence will be repeated every time the vehi-
cle is started as long as the malfunction
exists. When the malfunction indicator is illu-
minated, the system may not be able to detect
or signal low tire pressure as intended.
TPMS malfunctions may occur for a variety of
reasons, including the installation of incom-
patible replacement or alternate tires or
wheels on the vehicle that prevent the TPMS
from functioning properly. Always check the
TPMS malfunction telltale after replacing one
or more tires or wheels on your vehicle to
ensure that the replacement or alternate Tires
and wheels allow the TPMS to continue to
function properly.
It is the driver's responsibility to set the tirepressure to that recommended for cold tireswhich is suitable for the operating situation(Ypage 293). Note that the correct tire pressurefor the current operating situation must first betaught-in to the tire pressure monitor. If a sub-stantial loss of pressure occurs, the warningthreshold for the warning message is aligned tothe taught-in reference values. Restart the tirepressure monitor after adjusting the pressure ofthe cold tires (Ypage 300). The current pres-sures are saved as new reference values. As aresult, a warning message will appear if the tirepressure drops significantly.
The tire pressure monitor does not warn you ofan incorrectly set tire pressure. Observe thenotes on the recommended tire pressure(Ypage 293).
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 a
298Tire pressure
Wheels and tires

Tire-mounting tools should not be used nearthe valve. This could damage the electroniccomponents.
Only have tires changed at a qualified spe-cialist workshop.
Observe the instructions and safety notes in the"Changing a wheel" section (Ypage 310).
The wear patterns on the front and rear tiresdiffer, depending on the operating conditions.Rotate the wheels before a clear wear patternhas formed on the tires. Front tires typicallywear more on the shoulders and the rear tires inthe center.
On vehicles that have the same size front andrear wheels, you can rotate the wheels accord-ing to the intervals in the tire manufacturer'swarranty book in your vehicle documents. If nowarranty book is available, the tires should berotated every 3,000 to 6,000 miles (5,000 to10,000 km). Depending on tire wear, this maybe required earlier. Do not change the directionof wheel rotation.
Clean the contact surfaces of the wheel and thebrake disc thoroughly every time a wheel is rota-ted. Check the tire pressure and, if necessary,restart the tire pressure loss warning system(Canada only) or the tire pressure monitor (USAonly).
Direction of rotation
Tires with a specified direction of rotation haveadditional benefits, e.g. if there is a risk of hydro-planing. These advantages can only be gained ifthe tires are installed corresponding to thedirection of rotation.
An arrow on the sidewall of the tire indicates itscorrect direction of rotation.
Storing wheels
Store wheels that are not being used in a cool,dry and preferably dark place. Protect the tiresfrom oil, grease, gasoline and diesel.
Mounting a wheel
Preparing the vehicle
XStop the vehicle on solid, non-slippery andlevel ground.
XApply the electric parking brake manually.
XBring the front wheels into the straight-aheadposition.
XShift the transmission to position].
XSwitch off the engine.
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 position