tow MERCEDES-BENZ SLC 2018 User Guide

Problem
Possible causes/consequences and P Solutions
The PASSENGER AIR
BAG OFF indicator lamp
lights up and remains lit,
even though the front-
passenger seat is occu-
pied by an adult or ap er-
son of as tature corre-
sponding to that of an
adult. The classification of the person on the front-passenger seat is incor-
rect. X
Make sure the condition sf or ac orrect classification of the person
on the front-passenger seat are met ( Y
page 46).X
If the PASSENGER AIR BAG OFF indicator lamp remains lit, the front-
passenger seat may not be used. X
Have OCS checked as soon as possible at an authorized Mercedes-
Benz Center.
The PASSENGER AIR
BAG OFF indicator lamp
does not light up and/or
does not stay on.
The front-passenger seat
is: R
unoccupied R
occupied by the
weight of ac hild up to
twelve months old in a
child restraint system OCS is malfunctioning. X
Make sure there is nothin gb etween the seat cushion and the child
seat. X
Make sure that the entire base of the child restraint system rests on
the seat cushion of the front-passenger seat. The backrest of the
forward-facing child restraint system must lie as flat as possible
against the backrest of the front-passenger seat. If necessary,
adjust the position of the front-passenger seat. X
When installing the child restraint system, make sure that the seat
belt is tight. Do not pull the seat belt tight using the front-passenger
seat adjustment .T his could result in the seat belt and the child
restraint system being pulled too tightly. X
Check for correct installation of the child restraint system.
Make sure that the head restraint does not apply al oad to the child
restraint system. If necessary, adjust the head restraint accord-
ingly. X
Make sure that no object sa re applying additional weight onto the
seat. X
If the PASSENGER AIR BAG OFF indicator lamp remains off and/or
the PASSENGER AIR BAG ON indicator lamp lights up, do not install
ac hild restraint system on the front-passenger seat. X
Have OCS checked as soon as possible at an authorized Mercedes-
Benz Center.
Deployment of Emergency Tensioning
Devices and air bags
Important safety notes
G WARNING
The air bag parts are hot after an air bag has
been deployed. There is ar isk of injury.
Do not touch the air bag parts. Have a
deploye da ir bag replaced at aq ualified spe-
cialist workshop as soon as possible. G WARNING
Ad eploye da ir bag no longer offers any pro-
tection and cannot provide the intended pro-
tection in an accident. There is an increased
risk of injury.
Have the vehicle towed to aq ualified special-
ist workshop in order to have ad eploye da ir
bag replaced.
For your own safety and that of your front
passenger, it is important that you have
deploye da ir bags replaced and faulty air bags
repaired. This will help to make sure the air bags50
Occupant safety
Safety

G WARNING
If you leave children unsupervised in the vehi-
cle, they coul ds et it in motion by, for example:R
release the parking brake. R
shift the automatic transmission out of the
parking position P .R
start the engine.
In addition, they may operate vehicl ee quip-
ment and become trapped. There is ar isk of
an accident and injury.
When leaving the vehicle, alway st ake the
SmartKey with you and lock the vehicle. Never
leave children unsupervised in the vehicle.
G WARNING
If persons, particularl yc hildren are subjected
to prolonged exposure to extreme hea to r
cold, there is ar isk of injury ,p ossibly even
fatal .N ever leave children unattended in the
vehicle.
G WARNING
If the child restraint system is subjected to
direct sunlight, parts may get very hot. Chil-
dren may burn themselves on these parts,
particularl yont he metal parts of the child
restraint system. There is ar isk of injury.
If you leave the vehicle, taking the child with
you ,a lway se nsure that the child restraint
system is not expose dtod irect sunlight. Pro-
tect it with ab lanket, for example. If the child
restraint system has been expose dtod irect
sunlight, let it cool dow nb efore securing the
child in it. Never leave children unattended in
the vehicle.
Always ensure that all vehicl eo ccupants have
their seat belts fastened correctly and are sitting
properly .P articular attention must be pai dt o
children.
Observe the safety notes on the seat belt
( Y
pag e4 0) and the notes on correct use of seat
belts ( Y
pag e4 1).
Ab ooster seat may be necessary to achieve
prope rs eat bel tp ositioning for children over
40 lbs (18 kg )u ntil they reach ah eight where a three-point seat bel tc an be properly fastened
without ab ooster seat.
Special seatbelt retractor
G WARNING
If the seat bel tisr eleased while driving, the
child restraint system wil lnol onger be
secure dp roperly .T he special seat bel tr etrac-
tor is disable da nd the inertia real draw sina
portion of the seat belt. The seat bel tc annot
be immediatel yr efastened. There is an
increased risk of injury ,p ossibly even fatal.
Stop the vehicl ei mmediately, paying atten-
tion to road and traffic conditions. Reactivate
the special seat bel tr etractor and secure the
child restraint system properly.
The seat bel tont he front-passenger's side is
equipped with as pecial seat bel tr etractor.
When activated, the special seat bel tr etractor
ensure st hat the seat bel tc annot slacken once
the child seat is secured.
Installing ac hild restraint system: X
Make sure you observe the child restraint
system manufacturer's installation instruc-
tions. X
Pul lt he seat bel ts moothly out of the belt
loop. X
Engage seat bel tt ongue in bel tb uckle.
Activating the special seat bel tr etractor:X
Pul lt he seat bel to ut full ya nd let the inertia
reel retract it again.
Whil et he seat bel tisr etracting, you should
hear ar atcheting sound .T he special seat belt
retractor is enabled. X
Push the child restraint system dow nsot hat
the seat bel tist ight and does not loosen.
Removing the child restraint system and deac-
tivating the special seat bel tr etractor:X
Make sure you observe the child restraint
system manufacturer's installation instruc-
tions. X
Press the release button of the seat belt
buckle ,h old the bel tt ongue and guide it back
toward st he bel tl oop.
The special seat bel tr etractor is deactivated.54
Children in the vehicle
Safety

Child restraint system The use of seat belt sa nd child restraint systems
is required by law in: R
all 50 states R
th eU .S .t erri toriesR
th eD istrict of ColumbiaR
all Canadian provinces
You can obtain further informatio na bout the
correc tc hi ld restraint system from any author-
ize dM ercedes-Ben zC enter.
G WARNING
If th ec hi ld restraint system is installed incor-
rectly on as uitable seat ,itc anno tp rotect as
intended. The child canno tt he nber estrained
in th ee vent of an accident, heav yb raking or
sudde nc ha nges of direction .T her eisa n
increased ris kofi njury, possibly eve nf atal.
Mak es ure that you observ et he child restraint
system manufacturer' si nstallatio ni nstruc-
tions and th en otes on use. Pleas ee ns ure,
that th eb ase of th ec hi ld restraint system is
always restin gc ompletely on th es eat cush-
ion .N ever plac eo bjects, e.g .c ushions, under
or behin dt he child restraint system. Only use
child restraint systems wit ht he original cover
designe df or them. Only replace damaged
covers wit hg enuine covers.
G WARNING
If th ec hi ld restraint system is installed incor-
rectly or is no ts ecured, it can com el oos ei n
th ee vent of an accident, heav yb raking or a
sudde nc ha ng eind irection .T he child
restraint system coul dbet hr own about ,s tr ik-
ing vehicle occupants .T her eisani ncreased
ris kofi njury, possibly eve nf atal.
Always install child restraint systems prop-
erly, eve nift he ya re no tb ein gu sed. Make
sure that you observ et he child restraint sys-
te mm anufacturer' si nstallatio ni nstructions.
Further informatio nons to win go bjects, luggage
and loads securely can be foun du nde r“ Stowi ng
options/stowage compartments”
( Y
page 219). G WARNING
Child restraint systems or their securin gs ys-
tems whic hh ave been damaged or subjected
to al oad in an acciden tc an no longer protect
as intended. The child canno tt he nb e
restraine dint he event of an accident, heavy
braking or sudde nc ha nges of direction .T here
is an increased ris kofi njury, possibly even
fatal.
Replac ec hi ld restraint systems whic hh ave
been damaged or subjected to al oad in an
acciden tass oon as possible. Hav et he secur-
ing systems on th ec hi ld restraint system
checked at aq ualified specialist workshop,
before you install ac hi ld restraint system
again.
The securin gs ystem of child restraint systems is
th es eat belt system.
i If you install ac hi ld restraint system on the
front-passenger seat ,bes ure to observ et he
instruction sa nd safety note sont he "Occu-
pan tC lassificatio nS yste m( OCS)"
( Y
page 45). Ther ey ou will also fin di nforma-
tio nond eactivatin gt he front-passenger front
air bag.
All child restraint systems must mee tt he fol-
lowin gs ta ndards: R
U.S. Federal Motor Vehicle Safet yS ta ndards
21 3a nd 225 R
Canadian Motor Vehicle Safet yS ta ndards
21 3a nd 210.2
Confirmation that th ec hi ld restraint system cor-
responds to th es ta ndards can be foun dona n
instruction label on th ec hi ld restraint system.
This confir mation can also be foun di nt he instal-
lation instruction st ha ta re included wit ht he
child restraint system.
Observ et he warning labels in th ev ehicle inte-
rior and on th ec hi ld restraint system.
Child restraint system on th ef ro nt-
passenge rs eat
General notes
If you install ac hi ld restraint system on the
front-passenger seat ,a lways observ et heChildren in th ev ehicle 55
Safety Z

When towing the vehicle with the rear axle
raised, observe the notes on ESP ®
( Y
page 257).
If the

engine can be started by anyone with av alid
SmartKey that is left inside the vehicle.
i The immobilizer is alway sd eactivated when
you start the engine.
In the event that the engine cannot be started
(yet the vehicle's batter yisc harged), the sys-
tem is not operational. Contac tana uthorized
Mercedes-Benz Center or call
1-800-FOR-MERCedes (in the USA )o r
1-800-387-0100 (in Canada).
ATA (anti-theft alar ms ystem)X
To arm: lock the vehicle with the SmartKey or
KEYLESS-GO.
Indicator lamp C flashes. The alarm system
is armed after approximately 15 seconds. X
To switch off: unlock the vehicle with the
SmartKey or KEYLESS-GO.
Av isual and audible alarm is triggered if the
alarm system is armed and you open: R
ad oorR
the vehicle with the mechanical key R
the trun kl idR
the hood R
the glove box R
the stowage space under the armrest X
To tur nt he alar mo ff with the SmartKey:
press the 6 or 7 button on the Smart-
Key.
The alarm is stopped.
or X
Inser tt he SmartKey into the ignition lock.
The alarm is stopped. X
To stop the alar mu sing KEYLESS-GO:
grasp the outside door handle. The SmartKey
must be outside the vehicle.
The alarm is stopped.
or X
Press the Start/Stop button on the dash-
board. The SmartKey must be inside the vehi-
cle.
The alarm is stopped.
The alarm is not switched off, even if you close
the open door that triggered it, for example.
If the alarm continues for more than
30 seconds, the mbrace emergency call sys-
tem automatically notifies the Customer
Assistance Center.
This is done either by tex tm essage or data
connection. The emergency call system
sends the message or data provided that: R
you have subscribed to the mbrace service. R
the mbrace servic eh as been activated
properly. R
the necessary mobile phone network is
available.64
Protection against theft
Safety

Locking/unlockin gc entrallyYou can start ,l oc koru nlock th ev ehicle using
KEYLESS-GO .Todot hi s, you onl yn ee dc arry the
SmartKey with you. You can combine th ef unc-
tions of KEYLESS-GO with those of ac onven-
tional SmartKey. Unloc kt he vehicle by using
KEYLESS-GO ,f or instance, and loc kitu sin gt he
7 button on th eS ma rtKey.
The driver' sd oor and th ed oor at whic ht he han-
dle is used, must bot hbec losed. The SmartKey
must be outside th ev ehicle .W hen locking or
unlocking with KEYLESS-GO ,t he distance
between th ek ey and th ec orresponding door
handle must not be greater than 3ft(1m ).
Ac heck whic hp eriodicall ye stablishe sar adio
connectio nb etween th ev ehicle and th eS ma rt-
Key determine sw hether av alid SmartKey is in
th ev ehicle .T his occurs, for example:R
when starting th ee ngineR
while driving R
when th ee xternal door handles are touched
X
To unlock th ev ehicle: touch th ei nner sur-
fac eoft he door handle.X
To lock th ev ehicle: touch sensor surface C
or D .
Mak es ure that you do not touch th ei nner
surface of th ed oor handle.X
Convenience closing feature: touch
recesse ds ensor surface D for an extended
period.
Further informatio nont he convenience clos-
ing feature ( Y
page 76).
Deactivating and activating
If you do not intend to use aS ma rtKey for an
extended perio doft ime, you can deactivate the
KEYLESS-GO function of th ek ey. The SmartKey
will then use ver yl ittle power ,t he reb yc onserv- ing battery power .F or th ep urposes of activa-
tion/deactivation, th ev ehicle must not be
nearby. X
To deactivate: pres st he 7 button on the
SmartKey twic einr apid succession.
The battery check lamp ( Y
page 68 )oft he
SmartKey flashes twic eb riefly and light su p
once, then KEYLESS-GO is deactivated. X
To activate: pres sa ny button on th eS ma rt-
Key.
or X
Inser tt he SmartKey int ot he ignitio nl ock.
KEYLESS-GO and all of its associate df eatures
are available again.
Changing th es ettings of th el ocking
system You can change th es ettings of th el ockin gs ys-
tem .T his mean so nl yt he driver' sd oor ,t he lock-
able stowage compartments in th ev ehicle inte-
rior and th ef uel filler flap are unlocked when the
vehicle is unlocked. This is useful if you fre-
quently travel alone. X
To change th es etting: pres sa nd hold down
the 6 and 7 buttons simultaneously
for about six second su ntil th eb attery indica-
to rl amp ( Y
page 68 )f lashes twice.
If th es ettin goft he lockin gs ystem is changed
within th es ignal range of th ev ehicle ,p ressing
the 7 or 6 button: R
locks or R
unlock st he vehicle
The SmartKey now function sasf ollows:X
To unlock: pres st he 6 button once.X
To unlock centrally: pres st he 6 button
twice. X
To lock centrally: pres st he 7 button.
The KEYLESS-GO function is changed as fol-
lows: X
To unlock th ed ri ver's door: touch th ei nner
surface of th ed oor handle on th ed river's
door. X
To unlock centrally: touch th ei nner surface
of th ed river or front-passenger door handle. X
To lock centrally: touch th eo uter sensor
surface on one of th ed oor handles.66
SmartKey
Opening and closing

When leaving the vehicle, alway st ake the
SmartKey with you and lock the vehicle. This
also applies to mobile phones if the "Digital
Car Key in smartphone" function is activated
via the Mercedes me connect web app.
Unlocking and opening doors from
the inside
! The side windows will not open/close if the
batter yisd ischarged or if the side windows
have iced up. It will then not be possible to
close the door. Do not attempt to forc et he
door closed. You could otherwise damage the
door or the side window.
You can open ad oor from inside the vehicle
even if it has been locked.
If the vehicle has previously been locked from
the outside, opening ad oor from the inside will
trigger the anti-theft alarm system. Switc ho ff
the alarm ( Y
page 64).
X
Pull door handle D .
If the door is locked, lockin gk no b C pops up.
The door is unlocked and can be opened.
When ad oor is opened, the side window on that
side opens slightly. When the door is closed, the
side window closes again.
Centrally locking and unlocking the
vehicle from the inside
You can centrally lock or unlock the vehicle from
the inside. For example, you can unlock the
front-passenger door from the inside or lock the
vehicle before you pull away. X
To unlock: press button C .X
To lock: press button D .
If the front-passenger door is closed, the vehi-
cle locks.
The central lockin gb utton does not lock or
unlock the fuel filler flap or the stowage com-
partmen tint he center console.
You cannot unlock the vehicle centrally from the
inside if the vehicle has been locked with the
SmartKey or KEYLESS-GO.
You can open ad oor from inside the vehicle
even if it has been locked.
If al ocked door is opened from the inside, the
previous unlock status of the vehicle will be
taken into consideration if: R
the vehicle was locked using the lockin gb ut-
ton for the central locking, or R
if the vehicle was locked automatically
The vehicle will be fully unlocked if it had previ-
ously been fully unlocked. If only the driver's
door had been previously unlocked, only the
door which has been opened from the inside is
unlocked.
Automatic locking feature Doors 71
Opening and closing Z

X
To deactivate: press and hol db ut ton C for
abou tf iv es econds unti lat one sounds.X
To activate: press and hol db ut ton D for
abou tf iv es econds unti lat one sounds.
If yo up ress one of the two buttons and do not
hea rat one, the relevant setting ha sa lr eady
been selected.
The vehicl eisl oc ked automaticall yw he nt he
ignition is switched on and the wheels are turn-
ing.
Yo uc ould therefore lock yoursel fo ut if:R
the vehicl eisb ei ng pushed.R
the vehicl eisb ei ng towed.R
the vehicl eisonar olle rd yn amometer.
Yo uc an also switch the automatic locking func-
tio nona nd off using the on-board computer
( Y
page 173).
Unlocking/lockin gt he driver's door
using the mechanical key
i If yo uw an ttoc entrall yl oc kt he vehicl eu si ng
the mechanical key ,b egin by pressing the
locking button for the interio rl oc king mech-
anism whil et he driver's door is open. Then
lock the driver's door using the mechanical
key.
X
To unlock: turn the mechanical key counter-
clockwise as far as it will go to position G .X
To lock: turn the mechanical key clockwise as
far as it will go to position G .
If yo uu se the mechanical key to unlock and
open the driver's door, the anti-thef ta la rm sys-
tem will be triggered .S witch off the alarm
( Y
page 64). Trunk
Important safety notes
G WARNING
If objects, luggage or load sa re not secured or
not secured sufficiently ,t hey could slip ,t ip
ove rorbef lung around and thereb yh it vehicle
occupants. There is ar is kofi njury ,p ar ticu-
larly in the event of sudden braking or as ud -
de nc hange in direction.
Alway ss tor eo bj ects so tha tt hey canno tb e
flung around .S ecure objects, luggage or
load sa gain st slipping or tipping before the
journey.
! The trunk li ds wi ng su pwar ds when opened.
Therefore, make sure tha tt her eiss uf ficient
clearance above the trunk lid.
! Onl yc lose the trunk once the roo fisl owere d
completely. Otherwise, yo uc ould damag et he
roof.
If yo uc lose the trunk li db ef ore the roo fi s
lowered completely, the loading ai ds wi tch
lights up and aw ar ning tone sounds.
The opening dimensions of the trunk li dc an be
found in the "Vehicle data" section
( Y
page 295).
Do not leave the SmartKey in the trunk. You
could otherwise lock yoursel fo ut .
The trunk li dc an be: R
opened/close df rom outside R
opene da ut omaticall yf rom outsideR
locked separately R
opene dw it ht he emergency release button R
unlocke dw it ht he mechanical key
Yo us houl dp referabl yp la ce luggage or load si n
the trunk.72
Trunk
Opening and closing

Make sure that the roof and rear window are
clean and dry before opening the roof. Other-
wise, water or dirt could enter the vehicle inte-
rior or trunk.
Opening and closing using the roof
switch
Important safety notes
G WARNING
When opening or closing the roof, body parts
could be trapped by, for example, the roof
mechanism, trunk lid or side windows. There
is ar isk of injury.
When raising or lowering the roof, make sure
that no body parts are in the vicinity of moving
components. If someone becomes trapped,
release the button.
For safety reasons, you can only open or close
the roof when the vehicle is stationary.
! Operating the roof while pulling away: R
Observe the following traffic carefully. R
Do not drive faster than 25 mph (40 km/h). R
Avoid abrupt braking and swerving maneu-
vers.
Do not operate the roof when cornering, driv-
ing on uneven surfaces or during strong
winds. The vehicle may otherwise be dam-
aged.
i If the traffic condition sm ean that you have
to drive off while opening/closing the roof,
the procedure which was started while sta-
tionary can be continued at speeds of up to
approximately 25 mph (40 km/h). Opening and closing X
Vehicles without semi-automatic trunk
partition: close the trunk partition
( Y
page 79). X
Close the trunk lid ( Y
page 72).X
Turn the SmartKey to position H in the igni-
tion lock. X
Open the cover in the lower center console.
Roof switch C is located under the cover. X
To open :p ull roof switch C until the entire
roof is stowed away in the trunk.
The Vario-Roof in Operation
message
appears in the multifunction display .O nce the
opening procedure is complete, the message
disappears and at one sounds.
All of the side windows open.
If you operate the roof switch and the Trunk
Partition Open message appears in the
multifunction display ,t he trunk partition is
not closed correctly. X
Close the trunk partition. X
To close: press and hold soft-top switch C
until the soft top is fully closed.
The Vario-Roof in Operation
message
appears in the multifunction display .O nce the
opening procedure is complete, the message
disappears and at one sounds.
All of the side windows open. X
To close all side windows, pull the switch
under the cover of the center console
( Y
page 75).78
Roof
Opening and closing

Operating AIRGUIDE X
To fold out AIRGUIDE: turn disc C in the
direction of the arrow towards the middle of
the vehicle to the stop. X
Repeat with disc D .X
To fold in AIRGUIDE: turn discs C and D
back behind the roll bar to the stop.
Discs C and D can also be used independently
of each other ,e .g. when you are driving without
ap assenger.
MAGIC SKY CONTROL
General notes MAGIC SKY CONTROL is ap anorama roof, the
transparenc yofw hich can be changed by apply-
ing electrical voltage.
MAGIC SKY CONTROL can be switched between
darkened and transparent states.
MAGIC SKY CONTROL darken sa utomatically
after as hort period when you turn the SmartKey
to position