MERCEDES-BENZ SLC-Class 2017 R172 Repair Manual

If ESP®intervenes, the÷ESP®warning lamp
flashe sinthe instrument cluster.
If ESP
®intervenes:
XDo not deactivate ESP®under any circum-
stances.
XOnly depresst he accelerator pedalasf ar as
necessary when pulling away.
XAdapt you rdriving style to suit the prevailing
road and weather conditions.
ECO start/stop function
The ECO start/stop function switches the
engine off automatically when the vehicle stops
moving. The engine starts automatically when
the driver wants to pul lawa ya gain. ESP
®
remains in its previously selected status, e.g. if
ESP®was deactivated before the engine was
automatically switched off.
Deactivating/activating ESP®(except
SLC 43 AMG)
Important safety notes
iObserve the "Important safety notes" sec-
tion (Ypage 54).
You can select between the following states of
ESP
®:
RESP®is activated.
RESP®is deactivated.
GWARNING
If you deactivate ESP
®,E SP®no longer sta-
bilizes the vehicle.T here is an increased risk
of skidding and an accident.
Only deactivate ESP
®in the situations descri-
bed in the following.
It may be best to deactivate ESP
®in the follow-
ing situations:
Rwhen using snow chains
Rin deep snow
Ron sand or gravel
Spinning the wheel sresults in acutting action
which providesb etter grip.
iActivate ESP®as soon as the situations
describeda bove no longer apply. ESP®will
otherwise not be abl etostabilize the vehicle if the vehicle starts to skid or
awheel starts to
spin.
!Avoid spinning the driven wheel sfor an
extended period with ESP®deactivated. You
could otherwise damage the drivetrain.
Deactivating/activating ESP®
XTo deactivate: press button:.
The å ESP®OFF warning lamp in the
instrument cluster lights up.
XTo activate: press button :.
The å ESP®OFF warning lamp in the
instrument cluster goes out.
Characteristic swhen ESP®is deactivated
If ESP®is deactivated and one or more wheels
start to spin, the ÷ESP®warning lamp in the
instrument cluster flashes. In such situations,
ESP
®wil lnot stabilize the vehicle.
If you deactivate ESP®:
RESP®no longer improves driving stability.
REngine torque is no longer limited and the
drive wheel sare abl etospin.
RTraction control is still activated.
RActive Brake Assist is not available and is not
activated even if you brake firmly with assis-
tance from ESP
®
RPRE-SAFE®is no longer available, nor is it
activated if you brake firmly and ESP®inter-
venes.
RESP®still providess upport when you brake
firmly.
Driving safety systems59
Safety
Z

Deactivating/activating ESP (SLC 43®
AMG)
Important safet ynotes
iObserv ethe "Important safet ynotes "sec-
tion (Ypage 54).
You can selec tbetween th efollowin gstate sof
ES P
®:
RESP®is activated.
RSPORT handlin gmodeisa ctivated.
RESP®is deactivated.
GWARNING
Whe nSPORT handlin gmodeisa ctivated,
there is agreater ris kofskidding and acci-
dents .
Only activat eSPORT handlin gmodeint hesit-
uation sdescribed in th efollowing.
GWARNING
If you deactivat eESP
®,ESP®no longer sta-
bilizes th evehicle. There is an increase drisk
of skidding and an accident.
Only deactivat eESP
®in th esituation sdescri-
bed in th efollowing.
In th efollowin gsituations, it may be bette rto
activat eSPORT handlin gmodeord eactivat e
ES P
®:
Rwhen usin gsnowc hains
Rin dee psnow
Ron san dorgrave l
Ron specially designated roads when th evehi-
cle's own oversteering and understeering
characteristics are desire d
Spinning th ewheels result sinacutting action
whic hprovides bette rgrip.
Driving in SPORT handlin gmodeorw ithout
ES P
®require sanextremel yqualified and expe-
rienced driver .
iActivateESP®as soo nasthesituation s
described abov enolonger apply .ESP®will
otherwise no tbeable to stabilize th evehicle if
th ev ehicle start stoskidoraw heelstartst o
spin.
!Avoid spinnin gthe driven wheels fo ran
extended period wit hESP®deactivated. You
could otherwise damage th edrivetrain .
Deactivating/activating ESP®
XTo activate SPORT handling mode: briefly
press butto n: .
The M SPORT handlin gmodew arnin g
lamp in th einstrument cluster lights up. The
SPORT handling mod e
messageappears in
th em ultifunction display.
XTo deactivate SPORT handling mode:
briefly press butto n:.
The M SPORT handlin gmodew arnin g
lamp in th einstrument cluster goe sout.
XTo deactivate ESP®:press butto n: until
th eå ESP®OF Fw arnin glamp lights up in
th ei nstrument cluster.
The ÷ OFF
messag eappears in th emulti-
function display.
XTo activate ESP®: briefly press butto n:.
The å ESP®OF Fw arnin glamp in th e
instrumen tcluster goe sout.T he ÷ ESP®
ONmessag eappears in th emultifunction dis -
play.
Characteristics of activate dSPORT han-
dling mode
If SPORT handlin gmodeisa ctivated and on eor
more wheels start to spin, th e÷ ESP®warn -
in gl amp in th einstrument cluster flashes .ESP®
only stabilize sthe vehicle to alimited degree .
Whe nSPORT handlin gmodeisa ctivated:
RESP®only improves drivin gstability to alimi-
te dd egree .
RTraction contro lisstill activated.
60Driving safetys ystems
Safety

REngine torque is no longerlim ite da nd the
drive wheels ar eabletos pin.
RESP®still provides support when yo ubrake
firmly.
Characteristics when ESP®is deactivated
If ESP®is deactivated and one or mor ewheel s
start to spin, the ÷ESP®warning lamp in the
instrument cluster flashes. In such situations,
ESP
®will not stabilize the vehicle.
If yo udeactivate ESP®:
RESP®no longe rimproves drivin gstability.
REngine torque is no longe rlim ite da nd the
drive wheels ar eabletos pin.
RTractio ncontro lisstill activated.
RActiv eBrake Assist is not availabl eand is not
activated eve nifyoubrake firmly with assis-
tance fromE SP
®
RPRE-SAFE®is no longeravailable, nor is it
activated if yo ubrake firmly and ESP®inter-
venes.
RESP®still provides support when yo ubrake
firmly.
EBD (electroni cbrak eforce distribu-
tion)
General information
EBD monitors and controls the brake pressure
on the rea rwheel stoi mprov edrivin gstability
whil ebraking.
Important safety notes
iObserve the "Important safety notes" sec-
tio nfor drivin gsafety system s(Ypage 54).
GWARNING
If EBD is malfunctioning ,the rea rwheel scan
lock, e.g .under full braking .Thisi ncreases the
ris kofs kidding and an accident.
Yo us houl dtherefore adap tyou rd rivin gstyle
to the different handling characteristics. Have
the brake system checked at aquali fied spe-
cialist workshop.
Observe informatio nregarding indicator and
warning lamps (
Ypage 204 )aswellasd isplay
message s(Ypage 181).
ADAPTIVE BRAKE
i
Observe the "Important safety notes" sec-
tio n(Ypage 54).
ADAPTIVE BRAKE enhance sbraking safety and
offers increased braking comfort. In additio nto
the braking function, ADAPTIVE BRAKE also has
the HOLD functio n(
Ypage 148) and hill start
assist (Ypage 117).
Protectio nagainst theft
Immobilizer
XTo activate with the SmartKey: remove the
SmartKeyf romthe ignition lock.
XTo activate with KEYLESS-GO: switch the
ignition off and open the driver's door.
XTo deactivate: switch on the ignition.
The immobilize rprevents your vehicl efrom
being started withou tthe correct SmartKey.
When leaving the vehicle, always take the
SmartKeyw ithy ou and lock the vehicle. The
engine can be started by anyone with avalid
SmartKeyt hatislefti nsid ethe vehicle.
iThe immobilize risalwaysdeactivated when
yo us tart the engine.
In the event thatt he engine cannotbes tarted
(yet the vehicle's battery is charged) ,the sys-
tem is not operational .Contact an authorized
Mercedes-Benz Center or call
1-800-FOR-MERCede s(in the USA) or
1-800-387-0100 (i nCanada).
ATA (anti-theft alarm system)
Protectiona gainsttheft61
Safety
Z

XTo arm:lock the vehicl ewitht he SmartKey or
KEYLESS-GO.
Indicato rlam p: flashes. The alarm system
is armed afte rapproximately1 5seconds.
XTo disarm: unlock the vehicl ewitht he Smart-
Key or KEYLESS-GO.
Av isua land audibl ealarm is triggered if the
alarm system is armed and yo uopen:
Rad oor
Rthe vehicl ewitht he mechanical key
Rthe trunk lid
Rthe hood
Rthe glove box
Rthe stowag espace under the armrest
XTo turn the alarm off with the SmartKey:
press the %or& button on the Smart-
Key.
The alarm is switched off.
or
XInsert the SmartKey into the ignition lock.
The alarm is switched off.
XTo stopt he alarm using KEYLESS-GO:
grasp the outsid edoorh andle. The SmartKey
must be outsid ethe vehicle.
The alarm is switched off.
or
XPress the Start/Stop button on the dash-
board .The SmartKey must be insid ethe vehi-
cle.
The alarm is switched off.
The alarm is not switched off, eve nifyouclose
the open door thatt riggered it, for example.
iIf the alarm continue sfor more than
30 seconds ,the mbrace emergency cal lsys-
tem automaticall ynotifie sthe Customer
Assistance Center. Thi sisdonee ither by text
message or data connection. The emergency
cal lsystem send sthe message or data provi-
de dt hat:
Ryouh aves ubscribed to the mbrace service.
Rthe mbrace service hasb eena ctivated
properly.
Rthe necessary mobil ephone network is
available.
62Protectiona gainsttheft
Safety

SmartKey
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshifting the automatic transmission out of
park position P
RStart the engine.
There is arisk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
GWARNING
If you attach heavy or large object stothe
SmartKey, the SmartKey could be uninten-
tionally turned in the ignition lock. This could
cause the engine to be switched off. There is a risk of an accident.
Do not attach any heavy or large object stothe
SmartKey. Remove any bulky key rings before
insertingt he SmartKey into the ignition lock.
!Keep the SmartKey away from stron gmag-
netic fields. Otherwise, the remote control
function could be affected.
Strong magnetic fields can occur in the vicin-
ity of powerful electrical installations.
Do not keep the SmartKey:
Rwith electronic devices, e.g. amobile phone
or another SmartKey.
Rwith metallic objects, e.g. coins or metal foil.
Rinside metallic objects, e.g. ametal case.
This can affect the functionality of the Smart- Key.
SmartKey functions
:& Locks the vehicle
;FUnlockst he trunk lid
=%Unlockst he vehicle
XTo unlock centrally: press the%button.
If you do not open the vehicle within approx-
imately 40 seconds of unlocking:
Rthe vehicle is locked again.
Ranti-theft protection is reactivated.
XTo lock centrally: press the&button.
The SmartKey centrally locks/unlocks:
Rthe doors
Rthe trunk lid
Rthe stowage compartmentint he center con-
sole
Rthe fuel filler flap
The turn signals flash once when unlocking and
three times when locking.
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated and deactivated using
the on-board computer (
Ypage 174).
When it is dark, the surround lighting also comes
on if it is activated in the on-board computer
(
Ypage 173).
KEYLESS-GO
General notes
Bear in mind that the engine can be started by
any of the vehicle occupants if there is aKEY-
LESS-GO key in the vehicle (
Ypage 117).
SmartKey63
Opening and closing
Z

Locking/unlockingcentrally
You can start,lockorunlock thevehicle using
KEYLESS-GO .Todothis, you onl yneedc arry the
SmartKey with you. You can combine th efunc-
tions of KEYLESS-GO with those of aconven-
tional SmartKey. Unlockt hevehicle by using
KEYLESS-GO ,for instance, and lockitu singthe
& button on th eSmartKey.
The driver' sdoor and th edoor at whicht hehan-
dle is used, must bothbec losed. The SmartKey
must be outside th evehicle .When locking or
unlocking with KEYLESS-GO ,the distance
between th ekey and th ecorresponding door
handle must not be greater than 3ft(1m).
Ac heck whichp eriodicallyestablishesar adio
connectio nbetween th evehicle and th eSmart-
Key determine swhether avalid SmartKey is in
th ev ehicle .This occurs, for example:
Rwhen starting th eengine
Rwhile driving
Rwhen th eexternal door handles are touched
XTo unlock th evehicle: touch th einner sur-
fac eoft hedoor handle.
XTo lock th evehicle: touch sensor surface :
or ;.
Makes ure that you do not touch th einner
surface of th edoor handle.
XConvenience closing feature: touch
recesseds ensor surface ;for an extended
period.
Further informatio nontheconvenience clos-
ing feature (
Ypage 74).
Deactivating and activating
If you do not intend to use aSmartKey for an
extended perio doftime, you can deactivate the
KEYLESS-GO function of th ekey. The SmartKey
will then use veryl ittle power,therebyc onserv- ing battery power.F
or thepurposes of activa-
tion/deactivation, th evehicle must not be
nearby.
XTo deactivate: pressthe& button on the
SmartKey twic einrapid succession.
The battery check lamp (
Ypage 66 )ofthe
SmartKey flashes twic ebriefly and lightsu p
once, then KEYLESS-GO is deactivated.
XTo activate: pressany button on th eSmart-
Key.
or
XInsertt heSmartKey int othe ignitio nlock.
KEYLESS-GO and all of its associate dfeatures
are available again.
Changing th esettings of th elocking
system
You can change th esettings of th elockin gsys-
tem .This meanso nlyt he driver' sdoor,t helock-
able stowage compartments in th evehicle inte-
rior and th efuel filler flap are unlocked when the
vehicle is unlocked. This is useful if you fre-
quently travel alone.
XTo change th esetting: pressand hold down
the % and& buttons simultaneously
for about six second suntil th ebattery indica-
to rlamp (
Ypage 66 )flashes twice.
If th esettin goft helockin gsystem is changed
within th esignal range of th evehicle ,pressing
the & or% button:
Rlocks or
Runlock sthe vehicle
The SmartKey now functionsasf ollows:
XTo unlock:pressthe % button once.
XTo unlock centrally: pressthe % button
twice.
XTo lock centrally: pressthe& button.
The KEYLESS-GO function is changed as fol-
lows:
XTo unlock th edriver's door: touch theinner
surface of th edoor handle on th edriver's
door.
XTo unlock centrally: touch theinner surface
of th edriver or front-passenger door handle.
XTo lock centrally: touch theouter sensor
surface on one of th edoor handles.
64SmartKey
Opening and closing

XTo restore the factory settings:press and
hol dd ownthe % and& buttons simul-
taneouslyf or approximatelys ixseconds until
the battery check lamp (
Ypage 66 )flashes
twice.
Mechanical key
General notes
If the vehicl ecan no longer be locked or
unlocke dwitht he SmartKey or with KEYLESS-
GO ,use the mechanical key.
If yo uusethe mechanical key to unlock and
open the driver's door or the trunk lid, the anti-
thef talarm system will be triggered .Switch off
the alarm (
Ypage 61).
Removing the mechanical key
XPush release catch :in the direction of the
arrow and at the same time remove mechan- ica lkey ; from the SmartKey.
For further informatio nabout :
Runlocking the driver's door (Ypage 70)
Runlocking the trunk (Ypage 71)
Rlocking the vehicl e(Ypage 70)
Insertingthe mechanical key
XPush mechanical key ;completelyi nto the
SmartKey unti litengages and release
catch :is back in its basicp osition.
SmartKey battery
Important safety notes
GWARNING
Batterie scontain toxica nd corrosive substan-
ces. If batteries are swallowed, it can resul tin
severe health problems .There is ariskoff atal
injury.
Kee pbatteries outoft he reach of children. If
ab attery is swallowed, see kmedica lattention
immediately.
HEnvironmental note
Batterie scontain dangerous
substances. It is against the
la wtod ispose of them with
the householdr ubbish.They
must be collected separately and recycle dtoprotect the
environment.
Dispose of batteries in an
environmentally friendly
manner. Take discharged
batteries to aquali fied spe-
cialist workshop or aspecial
collectio npoint for used bat-
teries.
The SmartKey batteries contain perchlorate
material ,which mayr equire specia lhan dling
and regard for the environment. National guide-
lines must be observed during disposal. In Cal-
ifornia ,see www.dtsc.ca.gov/
HazardousWaste/Perchlorate/index.cfm .
Mercedes-Benz recommends thaty ouhave the
batteries replaced at aquali fied specialist work-
shop.
SmartKey65
Opening and closing
Z

Checking thebattery
XPress the &or% button.
The battery is working properl yifbattery
check lamp :lightsupb riefly.
The battery is discharged if battery check
lamp :does no tlight up briefly.
XChange th ebattery (Ypage 66).
If th eSmartKey battery is checked within the
signal reception range of th evehicle ,pressing
the & or% button:
Rlocks or
Runlock sthe vehicle
iYou can get abattery at any qualified spe-
cialist workshop.
Replacin gthe battery
You require aCR20253V cellbattery.
XTaket hemechanical ke yout of th eSmartKey
(Ypage 65).
XPress mechanical key ;intot he SmartKey
opening in th edirection of th earrow until bat-
tery compartmen tcover :opens. Do not
hold battery compartmen tcover :closed
while doings o.
XRemove battery compartmen tcover :.
XRepeatedly tap th eSmartKey against your
palm until battery =falls out.
XInsertt henewb attery witht hepositiv eter-
minal facing upwards. Use alint-free cloth to
do so.
XMakes ure that th esurface of th ebattery is
free of lint, grease and other contaminants.
XInsertt hefrontt absofb attery compartment
cover :intot he housing and then pres sto
close it.
XInsertm echanical key ;intot he SmartKey
(Ypage 65).
XCheckt hefunction of all SmartKey buttons on
th ev ehicle.
66SmartKey
Opening and closing

Problems with the SmartKey
ProblemPossible causes/consequences andMSolutions
You can no longer lock or
unlock the vehicle using
the SmartKey.The SmartKey battery is discharged or nearly discharged.
XCheck the SmartKey battery (Ypage 66) and replace it if necessary
(Ypage 66).
If this does not work:
XUnlock (Ypage 70) or lock (Ypage 70) the vehicle using the
mechanical key.
There is interference from apowerful source of radio waves.
XUnlock (Ypage 70) or lock (Ypage 70) the vehicle using the
mechanical key.
The SmartKey is faulty.
XUnlock (Ypage 70) or lock (Ypage 70) the vehicle using the
mechanical key.
XHave the SmartKey checked at aqualified specialist workshop.
You can no longer lock or
unlock the vehicle using
KEYLESS-GO.KEYLESS-GO was deactivated.
XReactivate KEYLESS-GO (Ypage 63).
The SmartKey battery is discharged or nearly discharged.
XCheck the SmartKey battery (Ypage 66) and replace it if necessary
(Ypage 66).
If this does not work:
XUnlock (Ypage 70) or lock (Ypage 70) the vehicle using the
mechanical key.
There is interference from apowerful source of radio waves.
XUnlock (Ypage 70) or lock (Ypage 70) the vehicle using the
mechanical key.
KEYLESS-GO is malfunctioning.
XLock/unlock the vehicle using the remote control function of the
SmartKey.
XHave the vehicle and SmartKey checked at aqualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function:
XUnlock (Ypage 70) or lock (Ypage 70) the vehicle using the
mechanical key.
XHave the vehicle and SmartKey checked at aqualified specialist
workshop.
SmartKey67
Opening and closing
Z

ProblemPossible causes/consequences andMSolutions
The engine cannot be
started using the Smart-
Key.The on-board voltage is too low.
XSwitch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
XCheck the starter battery and charge it if necessary (Ypage 248).
or
XJump-start the vehicle (Ypage 249).
or
XConsult aqualified specialist workshop.
The engine cannot be
started using KEYLESS-
GO. The SmartKey is in
the vehicle.The vehicle is locked.
XUnlock the vehicle and try to start the vehicle again.
The SmartKey battery is discharged or nearly discharged.
XCheck the SmartKey battery (Ypage 66) and replace it if necessary
(Ypage 66).
If this does not work:
XStart your vehicle with the SmartKey in the ignition lock.
There is interference from apowerful source of radio waves.
XStart your vehicle with the SmartKey in the ignition lock.
You have lost aSmart-
Key.XHave the SmartKey deactivated at aqualified specialist workshop.
XReport the loss immediately to the vehicle insurers.
XIf necessary, have the locks changed as well.
You have lost the
mechanical key.XReport the loss immediately to the vehicle insurers.
XIf necessary, have the locks changed as well.
Doors
Important safety notes
GWARNING
If children are left unsupervised in the vehicle,
they could:
Ropen the doors, thus endangering other
people or road users.
Rget out and disrupt traffic.
Roperate the vehicle's equipment.
Additionally, children could set the vehicle in
motion if, for example, they:
Rrelease the parking brake.
Rshifting the automatic transmission out of
park position P
RStart the engine.
There is arisk of an accident and injury.
When leaving the vehicle, always take the
SmartKey with you and lock the vehicle. Never
leave children or animals unattended in the
vehicle. Always keep the SmartKey out of
reach of children.
68Doors
Opening and closing