2017 MERCEDES-BENZ SLC warning light

SMS
see also Digital Operator's Man-
ual .................................................. 211
Snow chains ...................................... 257
Sockets
Center console .............................. 221
General notes ................................ 221
Sound
Switchin go n/off ........................... 212
Special seat belt retractor .................. 52
Specialist workshop ........................... .2 6
Speed, controlling
see Cruise control
Speedometer
Digital ............................................ 167
In the Instrument cluster ................. 31
Segment s. ..................................... 163
Selectin gt he display unit ............... 172
Sport handling mode
Activating/deactivating (SLC 43
AMG) ............................................... 60
Warning lamp ................................. 206
Standing lamps
Display message ........................... .1 89
Switching on/off .............................. 94
Start/stop function
see ECO start/stop function
Starting (engine) ................................ 116
Steering
Display message ............................ 200
Steering wheel
Adjusting (electrically ). .................... 87
Adjusting (manually ). ....................... 86
Butto no verview ............................... 32
Buttons (on-board computer) ......... 164
Important safety notes .................... 86
Storing settings (memory func-
tion) ................................................. 91
Steering whee lp addle shifters ........ 126
Stopwatch (RACETIMER) ................... 176
Stowag ea reas ................................... 217
Stowag ec om partments
Armrest (under ). ............................ 217
Center console .............................. 218
Cu ph olders ................................... 219
Door ............................................... 218
Eyeglasses compartment ............... 218 Glove box ....................................... 217
Important safety information ......... 217
Rear wal l ........................................ 218
Sto
wag en et ................................... 218
Stowag en et ....................................... 218
Summe rt ires ..................................... 257
Sun visor ............................................ 220
Surround lighting (on-board com-
puter) .................................................. 173
Switchin ga ir-recirculatio nm ode
on/off ................................................. 111
Switchin gonm edi am ode
Via the device list .......................... 216
T Tachometer ........................................ 163
Tail lamps
Displa ym essage ............................ 189
see Lights
Tank content
Fue lg auge ....................................... 31
Technical data
Capacities ...................................... 284
Emergency spare whee l. ................ 280
Information .................................... 282
Tires/wheels ................................. 278
Vehicl ed at a. .................................. 289
TELEAID
Call priority .................................... 225
Emergency cal l. ............................. 222
Genera ln otes ................................ 221
MB info cal lb ut ton ........................ 224
Roadsid eA ssistance button .......... 223
Self-test ......................................... 222
System .......................................... 222
Vehicl eH ealth Check .................... 225
Telephone
Accepting ac al l( multifunction
steering wheel) .............................. 170
Authorizing am obil ep hone (con-
necting) ......................................... 215
Connecting am obil ep hone (gen-
era li nformation) ............................ 214
Displa ym essage ............................ 200
Menu (on-board computer) ............ 169
Numbe rf rom the phone boo k. ....... 170
Redialing ........................................ 17016
Index

The u restraint system warning lamp in the
instrument cluster lights up when the ignition is
switched on. It goes out no later than af ew sec-
onds after the vehicle is started. The compo-
nent soft he restraint system are in operational
readiness.
Am alfunction has occurred if the u restraint
system warning lamp: R
does not light up after the ignition is switched
on R
does not go out after af ew seconds with the
engine running R
lights up again while the engine is running
G WARNING
If the restraint system is malfunctioning,
restraint system components may be trig-
gered unintentionally or may not deploy as
intended during an accident .T his can affect
for example the Emergency Tensioning
Device or the air bag. This poses an increased
risk of injury or even fatal injury.
Have the restraint system checked and
repaired in aq ualified specialist workshop as
soon as possible.
PASSENGER AIR BAG indicator lamp
PASSENGER AIR BAG ON indicator lamp C and
PASSENGER AIR BAG OFF indicator lamp D are
part of the Occupant Classification System
(OCS).
The indicator lamps display the status of the
front-passenger front air bag. R
PASSENGER AIR BAG ON lights up: the front-
passenger front air bag is enabled. If, in the
event of an accident ,a ll deployment criteria are met, the front-passenger front air bag is
deployed. R
PASSENGER AIR BAG OFF lights up: the front-
passenger front air bag is deactivated. It will
then not be deployed in the event of an acci-
dent.
Dependin gont he person in the front-passenger
seat, the front-passenger front air bag must
either be deactivated or enabled; see the fol-
lowing points. You must make sure of this both
before and during aj ourney.R
Children in ac hild restraint system:
whether the front-passenger front air bag is
enabled or deactivated depends on the instal-
led child restraint system, and the age and
size of the child. Therefore, be sure to observe
the notes on the "Occupant Classification
System (OCS)" ( Y
page 44) and on "Chil-
dren in the vehicle" ( Y
page 51). There you
will also find instructions on rearward and
forward-facing child restraint systems on the
front-passenger seat. R
All other persons: depending on the classi-
fication of the person in the front-passenger
seat, the front-passenger front air bag is ena-
bled or deactivated ( Y
page 44). Be sure to
observe the notes on "Seat
belts“ ( Y
page 38) and "Air bags"
( Y
page 42). There you can also find infor-
mation on the correc ts eat position.
Seat belts
Introduction Seat belts are the most effective means of
restrictin gt he movemen tofv ehicle occupants
in the event of an accident or the vehicle rolling
over. This reduces the risk of vehicle occupants
coming into contact with parts of the vehicle
interior or being ejected from the vehicle. Fur-
thermore, the seat belt helps to keep the vehicle
occupant in the best position in relation to the
air bag.
The seat belt system comprises: R
Seat belts R
Emergency Tensionin gD evices and seat belt
force limiters
If the seat belt is pulled by the belt loop quickly
or with aj erk ym ovement, the belt retractor
locks. The belt strap cannot be extracted any
further.38
Occupant safety
Safety

If the front passenger does not observe these
conditions, OCS may produce af alse classifica-
tion, e.g. because the front passenger: R
transfers their weight by supporting them-
selves on av ehicle armrestR
sits in such aw ay that their weight is raised
from the seat cushion
If you install ac hild restraint system on the
front-passenger seat, be sure to observe the
correct positioning of the child restraint system.
Never place objects under or behind the child
restraint system, e.g. ac ushion. The entire base
of the child restraint system must always rest on
the seat cushio noft he 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.
The child restraint system must not touch the
roof or be subjected to al oad by the head
restraint. Adjust the angle of the seat backrest
and the head restraint positio na ccordingly.
Only then can OCS be guaranteed to function
correctly. Alway so bserve the child restraint sys-
tem manufacturer's installation and operating
instructions.
Occupant Classification System opera-
tion (OCS)
C
PASSENGER AIR BAG ON indicator lamp
D
PASSENGER AIR BAG OFF indicator lamp
The indicator lamp si nform you whether the
front-passenger front air bag is deactivated or
enabled. X
Press the Start/Stop button once or twice, or
turn the SmartKey to position 1 or 2 in the
ignition lock.
The system carries out self-diagnostics. The PASSENGER AIR BAG OFF and PASSENGER
AIR BAG ON indicator lamp sm ust ligh tu ps imul-
taneousl yf or approximately six seconds.
The indicator lamp sd isplay the status of the
front-passenger front air bag. R
PASSENGER AIR BAG ON lights up: the front-
passenger front air bag is enabled. If, in the
event of an accident, all deployment criteria
are met, the front-passenger front air bag is
deployed. R
PASSENGER AIR BAG OFF lights up: the front-
passenger front air bag is deactivated. It will
then not be deployed in the event of an acci-
dent.
If the status of the front-passenger front air bag
changes whil et he vehicle is in motion, an air bag
display messag ea ppears in the instrument clus-
ter ( Y
page 187). When the front-passenger
seat is occupied, always pay attention to the
PASSENGER AIR BAG ON and PASSENGER AIR
BAG OFF indicator lamps. Be aware of the status
of the front-passenger front air bag both before
and during the journey.
G WARNING
If the PASSENGER AIR BAG OFF indicator
lamp is lit, the front-passenger front air bag is
disabled .Itw il ln ot be deployed in the event of
an accident and cannot perform its intended
protective function. Ap erson in the front-
passenger seat could then, for example ,c ome
into contact with the vehicle's interior, espe-
ciall yift he person is sitting too close to the
dashboard. This poses an increased risk of
injury or even fatal injury.
When the front-passenger seat is occupied,
always ensure that: R
the classification of the person in the front-
passenger seat is correct and the front-
passenger front air bag is enabled or disa-
bled in accordance with the person in the
front-passenger seat R
the front-passenger seat has been moved
back as far back as possible. R
the person is seated correctly.
Make sure, both before and during the jour-
ney, that the status of the front-passenger
front air bag is correct.Occupant safety 45
Safety Z

G WARNING
If you secure ac hild in ar earward-facing child
restraint system on the front-passenge rs eat
and the PASSENGER AIR BAG ON indicator
lamp is lit up, the front-passenge rf ront air bag
may deploy in an accident. The child coul db e
struck by the air bag .T his pose sani ncreased
risk of injury or even fatal injury.
Make sure that the front-passenge rf ront air
bag has been disabled. The PASSENGER AIR
BAG OFF indicator lamp must be lit.
If the PASSENGER AIR BAG OFF indicator lamp
remains off and/or the PASSENGER AIR BAG
ON indicator lamp lights up, do not install ar ear-
ward-facing child restraint system on the front-
passenger seat. You can find more information
on OCS under "Problems with the Occupant
Classification System" ( Y
pag e4 8).
G WARNING
If you secure ac hild in af orward-facing child
restraint system on the front-passenge rs eat
and you position the front-passenge rs eat too
close to the dashboard, in the event of an
accident, the child could: R
come into contact with the vehicle's inte-
rior if the PASSENGER AIR BAG OFF indi-
cator lamp is lit, for example R
be struck by the air bag if the PASSENGER
AIR BAG ON is lit up
This poses an increased risk of injury or even
fatal injury.
Move the front-passenge rs eat as far back as
possible .A lways make sure that the shoulder
bel ts trap is correctly routed from the vehicle
bel tl oop to the shoulde rb el tg uide on the
child restraint system. The shoulde rb el ts trap
must be routed forwards and downwards
from the bel tl oop .A lways observe the child
restraint system manufacturer's installation
instructions.
If OCS determines that: R
the front-passenge rs eat is unoccupied ,t he
PASSENGER AIR BAG OFF indicator lamp
lights up after the system self-test and remains lit. This indicates that the front-
passenger front air bag is deactivated. R
the front-passenge rs eat is occupied by a
child of up to twelve months old, in as tandard
child restraint system, the PASSENGER AIR
BAG OFF indicator lamp lights up after the
system self-test and remains lit. This indi-
cates that the front-passenge rf ront air bag is
deactivated.
But even in the case of at welve-month-old
child ,inas tandard child restraint system, the
PASSENGER AIR BAG ON can light up perma-
nently after the system self-test. This indi-
cates that the front-passenge rf ront air bag is
activated. The result of the classification is
dependent on, among other factors, the child
restraint system and the child's stature. Make
sure that the conditions for ac orrect classi-
ficatio na re met. If the PASSENGER AIR BAG
OFF indicator lamp is still lit, do not install a
child restraint system on the front-passenger
seat. R
the front-passenge rs eat is occupied by ap er-
son of smaller stature (e.g. at eenage ro r
smal la dult), either the PASSENGER AIR BAG
ON or PASSENGER AIR BAG OFF indicator
lamp lights up and remains lit after the system
self-test depending on the result of the clas-
sification. -
If the PASSENGER AIR BAG ON indicator
lamp lights up, move the front-passenger
seat as far back as possible. -
If the PASSENGER AIR BAG OFF indicator
lamp is lit, ap erso nofs maller stature
should not use the front-passenge rs eat.R
the front-passenge rs eat is occupied by an
adult or ap erso nofa dult stature, the
PASSENGER AIR BAG ON indicator lamp
lights up after the system self-test and
remains lit. This indicates that the front-
passenger front air bag is activated.
If children are traveling in the vehicle, be sure to
observe the notes on "Children in the vehicle"
( Y
pag e5 1).
When OCS is malfunctioning, the red u
restraint system warning lamp in the instrument
cluster and the PASSENGER AIR BAG OFF indi-
cator lamp light up simultaneously .T he front-
passenger front air bag is deactivated in this
case and does not deploy during an accident.
Have the system checked by qualified techni-
cians as soon as possible .C onsult an authorized
Mercedes-Benz Center. The front-passenger46
Occupant safety
Safety

seat should only be repaired at an authorized
Mercedes-Benz Center.
If the front-passenger seat, the seat cover or the
seat cushion is damaged ,h ave the necessary
repair work carried out at an authorized
Mercedes-Benz Center.
For safety reasons, Mercedes-Benz recom-
mends that you only use seat accessories that
have been approved by Mercedes-Benz.
If the driver's air bag deploys, this does not
mean that the front-passenger front air bag will
also deploy .T he Occupant Classification Sys-
tem (OCS) categorizes the occupant in the front-
passenger seat. Depending on that result, the
front-passenger front air bag is either enabled or
deactivated.
System self-test
G DANGER
If both the PASSENGER AIR BAG OFF and
PASSENGER AIR BAG ON indicator lamps do
not light up during the system self-test, the
system is malfunctioning. The front-
passenger front air bag might be triggered
unintentionally or might not be triggered at all
in the event of an accident with high deceler-
ation. This poses an increased risk of injury or
even fatal injury.
In this case the front-passenger seat may not
be used. Do not install ac hild restraint system
on the front-passenger seat. Have the Occu-
pant Classification System (OCS) checked
and repaired immediately at aq ualified spe-
cialist workshop.
G WARNING
If the PASSENGER AIR BAG OFF indicator
lamp remains lit after the system self-test, the
front-passenger front air bag is disabled. It will
not be deployed in the event of an accident. In
this case, the front-passenger front air bag
cannot perform its intended protective func-
tion, e.g. when ap erson is seated in the front-
passenger seat.
That person could, for example, come into
contact with the vehicle's interior, especially
if the person is sitting too close to the dash- board. This poses an increased risk of injury or
even fatal injury.
When the front-passenger seat is occupied,
always ensure that: R
the classification of the person in the front-
passenger seat is correct and the front-
passenger front air bag is enabled or disa-
bled in accordance with the person in the
front-passenger seat R
the person is seated properly with ac or-
rectly fastened seatbelt R
the front-passenger seat has been moved
as far back as possible
If the PASSENGER AIR BAG OFF indicator
lamp remains lit when it should not, the front-
passenger seat may not be used. Do not
install ac hild restraint system on the front-
passenger seat. Have the Occupant Classifi-
cation System (OCS) checked and repaired
immediately at aq ualified specialist work-
shop.
G WARNING
Objects between the seat surface and the
child restraint system could affect OCS oper-
ation. This could result in the front-passenger
air bag not functionin gasi ntended during an
accident. This poses an increased risk of
injury or even fatal injury.
Do not place any objects between the seat
surface and the child restraint system. The
entire base of the child restraint system must
always rest on the seat cushion of the front-
passenger seat. The backrest of the forward-
facing child restraint system must, as far as
possible ,ber esting on the backrest of the
front-passenger seat. Always comply with the
child restraint system manufacturer's instal-
lation instructions.
After the system self-test, the PASSENGER AIR
BAG OFF or PASSENGER AIR BAG ON indicator
lamp displays the status of the front-passenger
front air bag ( Y
page 45).
For more information about the OCS, see "Prob-
lems with the Occupant Classification System"
( Y
page 48).Occupant safety 47
Safety Z

Problems with the Occupant Classification System (OCS) Be sure to observe the notes on "System self-test "( Y
page 47).
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 44).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 with 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 have48
Occupant safety
Safety

deployed air bags replaced and faulty air bags
repaired. This will help to make sure the air bags
continue to perfor mt heir protective function for
the vehicle occupants in the event of ac rash.
G WARNING
Emergenc yT ensioning Devices that have
deployed pyrotechnically are no longer opera-
tional and are unable to perfor mt heir inten-
ded protective function .T his poses an
increased risk of injury or even fatal injury.
Have pyrotechnically triggered Emergency
Tensioning Devices replaced immediately at a
qualified specialist workshop.
An electric moto risu sed by PRE-SAFE ®
to trig-
ger the tightenin goft he seat belt in hazardous
situations. This procedure is reversible.
If Emergenc yT ensioning Devices are triggered
or air bags are deployed, you will hear ab ang,
and as mall amount of powder may also be
released. The u restraint system warning
lamp lights up.
Only in rare cases will the bang affect your hear-
ing. The powder that is released generally does
not constitute ah ealth hazard, but it may cause
short-term breathin gd ifficulties in people with
asthma or other respiratory problems. Provided
it is safe to do so, you should leave the vehicle
immediately or open the window in order to pre-
vent breathin gd ifficulties.
Air bags and pyrotechnic Emergenc yT ensioning
Devices (ETDs) contain perchlorate material,
which may require special handling and regard
for the environment. National guidelines must
be observed during disposal. In California, see
www.dtsc.ca.gov/HazardousWaste/
Perchlorate/index.cfm .
Method of operation Durin gt he first stage of ac ollision, the restraint
system control unit evaluates important physi-
cal data relatin gtov ehicle deceleration or accel-
eration ,s uch as:R
duration R
direction R
intensity
Based on the evaluation of this data, the
restraint system control unit triggers the Emer-
genc yT ensioning Devices during af rontal or
rear collision. An Emergenc yT ensioning Devic ec an only be
triggered, if: R
the ignition is switched on R
the component soft he restraint system are
operational. You can find further information
under: "Restraint system warning lamp"
( Y
page 37) R
the belt tongue has engaged in the belt buckle
of the respective seat
If the restraint system control unit detects a
more severe accident, further component so f
the restraint system are activated independ-
ently of each other in certain frontal collision
situations: R
Fron ta ir bags as well as driver' sa nd front-
passenger knee bags
The front-passenger fron ta ir bag is activated or
deactivated dependin gont he person on the
front-passenger seat. The front-passenger front
air bag can only deploy in an acciden tift he
PASSENGER AIR BA GONi ndicator lamp is lit.
Observe the information on the PASSENGER AIR
BA Gi ndicator lamps ( Y
page 38).
Your vehicle has two-stage fron ta ir bags. During
the first deployment stage, the fron ta ir bag is
filled with propellant gas to reduce the risk of
injuries. The fron ta ir bag is fully deployed with
the maximum amount of propellant gas if as ec-
ond deployment threshold is reached within a
few milliseconds.
The activation threshold of the Emergenc yT en-
sionin gD evices and the air bag are determined
by evaluating the rate of vehicle deceleration or
acceleration which occurs at various point si n
the vehicle. This proces sisp re-emptive in
nature. Deploymen ts hould take place in good
time at the start of the collision.
The rat e
of vehicle deceleration or acceleration
and the direction of the forc ea re essentially
determined by: R
the distribution of forces during the collision R
the collision angle R
the deformation characteristic soft he vehicleR
the characteristic soft he objec tw ith which
the vehicle has collided
Factors which can only be seen and measured
after ac ollision has occurred do not play ad eci-
sive role in the deployment of an air bag. Nor do
they provide an indication of air bag deploy-
ment.
The vehicle can be deformed considerably, with-
out an air bag being deployed. This is the case ifOccupant safety 49
Safety Z

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 e3 9) and the notes on correct use of seat
belts ( Y
pag e4 0).
Ab ooster seat may be necessary to achieve
prope rs eat bel tp ositioning for children over
41 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 seat bel tr etractor
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-passenge rs ide is
equipped with as pecial seat bel tr etractor.
When activated, the special seat bel tr etractor
ensure st hat the seat bel tw il ln ot slacken once
the child restraint system has been secured.
Installing ac hild restraint system: X
Always comply with the child restraint system
manufacturer's installation instructions. X
Pul lt he seat bel ts moothly out of the belt
loop. X
Engage the seat bel tt ongue in the 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 activated. X
Push the child seat restraint system dow ns o
that the seat bel tist ight and does not loosen.
Removing ac hild restraint system and deacti-
vating the special seat bel tr etractor:X
Always comply with the child restraint system
manufacturer's installation instructions. X
Press the release button of the bel tb uckle,
hold the bel tt ongue firmly and guide it back
toward sb el tl oop.
The special seat bel tr etractor is deactivated.52
Children in the vehicle
Safety