2018 MERCEDES-BENZ CLA ignition

Service center
see Qualified specialist workshop
Service Center
see Qualified specialist workshop
Service menu (on-board com-
puter) .................................................. 186
Service message
see ASSYST PLUS
Service products
Brake fluid .................................... .3 18
Coolant (engine) ............................ 318
Engine oil ....................................... 317
Fuel ................................................ 315
Important safety notes .................. 315
Refrigerant (air-conditioning sys-
tem) ............................................... 319
Washer fluid ................................... 319
Settin gt he air distribution .............. .1 16
Settin gt he airflow ............................ 117
Settin gt he date/time format
see also Digita lO perator's Man-
ua l. ................................................ .2 29
Settin gt he language
see also Digita lO perator's Man-
ua l. ................................................ .2 29
Settin gt he time
see also Digita lO perator's Man-
ua l. ................................................ .2 29
Settings
Factory (on-board computer) ......... 188
On-board computer ....................... 186
SETUP (on-board computer,
Mercedes-AMG vehicles) .................. 188
Side impact air bag ............................ .4 7
Side marker lamp (display mes-
sage) ................................................... 204
Side windows
Cleaning ......................................... 264
Convenienc ec losing feature ............ 83
Convenienc eo pening feature ......... .8 3
Important safety information ........... 81
Opening/closing .............................. 82
Proble m( malfunction) .................... .8 4
Resettin g. ........................................ 84
Reversin gf eature ............................ .8 2 SIRIUS services
see also Digital Operator's Man-
ual .................................................. 229
Sliding sunroof
see Panorama roof with power
tilt/sliding panel
SmartKey
Changing the battery ....................... 73
Changing the programming ............ .7 2
Checkin gt he battery ...................... .7 3
Convenience closin gf eature ............ 83
Convenience opening feature .......... 83
Display message ............................ 216
Door central locking/unlocking ...... .7 0
Important safety notes .................... 70
KEYLESS-GO start function .............. 71
Loss ................................................ .7 4
Mechanical key ................................ 72
Positions (ignition lock) ................. 122
Problem (malfunction) ..................... 74
Starting the engine ........................ 124
SmartKey positions (ignition lock) .. 122
Smartphone
Starting the engine ........................ 124
SMS
see also Digital Operator's Man-
ual .................................................. 229
Snow chains ...................................... 290
Sound
Switching on/off ........................... 230
Special seat belt retractor .................. 55
Specialist workshop ........................... .2 8
Speed, controlling
see Cruise control
Speedometer
Activating/deactivating the addi-
tional speedometer ........................ 187
Digital ............................................ 181
In the Instrument cluster ................. 33
Segment s. ..................................... 176
Selectin gt he display unit ...... ......... 186
SPORT handling mode
Deactivating/activat ing
(Mercedes-AMG
vehicles) ............... .6 6
Warning lamp ................................. 222
Standing lamps
Display message ........................... .2 03
Switching on/off ........................... 101 Index 17

Panic alarm X
To activate: press and hold the
3 button C for approx. one second.
Av isual and audible alarm is triggered if the
alarm system is armed. X
To deactivate: press 3 button C again.
or X
Insert the SmartKey into the ignition lock.
or, in vehicles with KEYLESS-GO start-function
or KEYLESS ‑ GOX
Press the Start/Stop button.
The SmartKey must be in the vehicle.
Occupant safety
Introduction to the restraint system The restraint system can reduce the risk of vehi-
cle occupants coming into contact with parts of
the vehicle's interior in the event of an accident.
The restraint system can also reduce the forces
to which vehicle occupants are subjected during
an accident.
The restraint system comprises: R
Seat belt system R
Air bags R
Child restraint system R
Child seat securing systems
The components of the restraint system work in
conjunction with each other. They can only
deploy their protective function if, at all times, all
vehicle occupants: R
have fastened their seat belts correctly
( Y
page 43)R
have the seat and head restraint adjusted
properly ( Y
page 90) As the driver, you also have to make sure that
the steering wheel is adjusted correctly.
Observe the information relating to the correct
driver's seat position ( Y
page 90).
You also have to make sure that an air bag can
inflate properly if deploye d( Y
page 45).
An air bag supplements ac orrectly worn seat
belt. As an additional safety device, the air bag
increases the level of protection for vehicle
occupants in the event of an accident. For exam-
ple, if, in the event of an accident, the protection
offered by the seat belt is sufficient, the air bags
are not deployed. When an accident occurs, only
the air bags that increase protection in that par-
ticular accident situation are deployed. How-
ever, seat belts and air bags generally do not
protect against object sp enetrating the vehicle
from the outside.
Information on restraint system operation can
be found under "Triggering of the Emergency
Tensioning Devices and air bags" ( Y
page 52).
See "Children in the vehicle" for information on
children traveling with you in the vehicle as well
as on child restraint systems ( Y
page 54).
Important safety notes
G WARNING
Modifications to the restraint system may
cause it to no longer work as intended. The
restraint system may then not perform its
intended protective function and may fail in an
accident or trigger unexpectedly, for example.
This poses an increased risk of injury or even
fatal injury.
Never modify parts of the restraint system.
Never tamper with the wiring, the electronic
components or their software.
If it is necessary to modify components of the
restraint system to accommodate ap erson with
disabilities, contact an authorized Mercedes-
Benz Center for details. USA only: for further
information contact our Customer Assistance
Center at 1-800-FOR-MERCedes
(1 ‑ 800 ‑ 367 ‑ 6372).
Mercedes-Benz recommends that you only use
driving aids which have been approved specifi-
cally for your vehicle by Mercedes-Benz.40
Occupant safety
Safety

Restraint system warnin gl ampThe functions of the restraint system are
checke da fte rt he ignition is switched on and at
regular interval sw hile the engine is running.
Therefore, malfunctions can be detected in
goo dt ime.
The u restraint system warning lamp on the
instrument cluster lights up when the ignition is
switched on. It goe so ut no later than af ew sec-
onds afte rt he vehicl eiss tarted. The compo-
nents of the restraint system are in operational
readiness.
Am alfunction ha so ccurred if the u restraint
system warning lamp: R
doe sn ot light up afte rt he ignition is switched
on R
doe sn ot go ou ta fte raf ew seconds with the
engine running R
lights up agai nw hile the engine is running
G WARNING
If the restraint system is malfunctioning,
restraint system components may be trig-
gered unintentionally or may not deplo ya s
intended during an accident. Thi sc an affect
for exampl et he Emergency Tensioning
Device or the ai rb ag .T hi sp oses an increased
ris kofi njury or eve nf ata li njury.
Have the restraint system checke da nd
repaired in aq uali fied specialist worksho pa s
soo na sp ossible.
PASSENGER AI RB AG 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 statu soft he
front-passenger front ai rb ag .R
PASSENGER AIR BAG ON lights up for 60 sec-
onds ,s ub sequently both indicator lamps are
off (PASSENGER AIR BAG ON and OFF) :t he
front-passenger front ai rb ag is able to deploy
in the event of an accident. R
PASSENGER AIR BAG OFF lights up :t he front-
passenger front ai rb ag is deactivated. It will
then not be deploye dint he event of an acci-
dent.
If the PASSENGER AIR BAG ON indicator lamp is
off, only the PASSENGER AIR BAG OFF indicator
lamp shows the statu soft he front-passenger
front ai rb ag .T he PASSENGER AIR BAG OFF
indicator lamp may be li tc ontinuously or be off.
Depending on the person in the front-passenger
seat, the front-passenger front ai rb ag must
either be deactivated or enabled; see the fol-
lowing points. Yo um us tm ake sure of this both
before and during aj ourney.R
Childre ninac hild restrain ts ystem:
whethe rt he front-passenger front ai rb ag is
enabled or deactivated depends on the instal-
le dc hild restraint system, and the ag ea nd
size of the child .T herefore, be sure to observe
the notes on the "Occupant Classification
System (OCS)" ( Y
page 47 )a nd on "Chil-
dre nint he vehicle" ( Y
page 54). There you
wil l also find instructions on rearward and
forwa rd-facing child restraint systems on the
front-passenger seat. R
Al lo the rp ersons: depending on the classi-
fication of the person in the front-passenger
seat, the front-passenger front ai rb ag is ena-
bled or deactivated ( Y
page 47). Be sure to
observe the notes on "Seat
belts“ ( Y
page 41 )a nd "Ai rb ag s"
( Y
page 45). There yo uc an also find infor-
mation on the correct sea tp osition.
Seat belts
Introduction
Sea tb elts are the most effective means of
restricting the movement of vehicl eo ccupants
in the event of an accident or the vehicl er olling
over. Thi sr educe st he ris kofv ehicl eo ccupants
coming into contact with parts of the vehicle
interio rorb eing ejecte df rom the vehicle. Fur-
thermore ,t he sea tb el th elps to keep the vehicleOccupan ts afety 41
Safety Z

Requirements To be classifie dc orrectly ,t he front passenger
mus ts it:R
with the sea tb el tf astened correctlyR
in an almost upright position with thei rb ac k
against the sea tb ac krestR
with thei rf ee tr esting on the floor, if possible
If the front passenger doe sn ot observe these
conditions ,O CS may produce af alse classifica-
tion, e.g. because the front passenger: R
transfers thei rw eigh tb ys uppo rting them-
selves on av ehicl ea rmrestR
sits in such aw ay that thei rw eigh tisr aised
from the sea tc ushion
If it is absolutely necessary to install ac hild
restraint system on the front-passenger seat, be
sure to observe the correct positioning of the
child restraint system. Neve rp la ce objects
under or behind the child restraint system, e.g. a
cushion. The entir eb as eoft he child restraint
system mus ta lway sr es tont he sea tc ushio no f
the front-passenger seat. The backrest of the
forward-facing child restraint system mus tl ie as
fla ta sp ossible against the backrest of the front-
passenger seat.
The child restraint system mus tn ot touch the
roo forbes ub jecte dtoal oa dbyt he head
restraint. Adjust the angle of the sea tb ac krest
and the hea dr estraint position accordingly.
Only then can OC Sbeg ua ranteed to function
correctly .A lway so bserve the child restraint sys-
tem manufacturer' si nstallation and o perating
i
nstructions.
Operatio nofO cc upant Classification
System (OCS)
C
PASSENGER AIR BAG ON indicator lamp
D
PASSENGER AIR BAG OFF indicator lamp The indicator lamps inform yo uw he the rt he
front-passenger front ai rb ag is deactivated or
enabled. X
Press the Start/Sto pb ut ton once or twice, or
turn the SmartKey to position G or H in the
ignition lock.
The system carrie so ut self-diagnostics.
The PASSENGER AIR BAG OFF and PASSENGER
AIR BAG ON indicator lamps mus tl ig ht up simul-
taneously for approximately six seconds.
The indicator lamps display the statu soft he
front-passenger front ai rb ag .R
PASSENGER AIR BAG ON lights up for 60 sec-
onds ,s ub sequently both indicator lamps are
off (PASSENGER AIR BAG ON and OFF) :t he
front-passenger front ai rb ag is able to deploy
in the event of an accident. R
PASSENGER AIR BAG OFF lights up :t he front-
passenger front ai rb ag is deactivated. It will
then not be deploye dint he event of an acci-
dent.
If the PASSENGER AIR BAG ON indicator lamp is
off, only the PASSENGER AIR BAG OFF indicator
lamp shows the statu soft he front-passenger
front ai rb ag .T he PASSENGER AIR BAG OFF
indicator lamp may be li tc ontinuously or be off.
If the statu soft he front-passenger front ai rb ag
changes whil et he vehicl eisinm otion, an ai rb ag
display message appears in the instrument clus-
ter ( Y
page 200). Whe nt he front-passenger
sea ti so ccupied, always pa ya ttention to the
PASSENGER AIR BAG OFF indica tor l amp. Be
a
ware of the statu soft he front-passenger front
ai rb ag both before and during the journey.
G WARNING
If the PASSENGER AIR BAG OFF indicator
lamp is lit, the front-passenger front ai rb ag is
disabled. It will not be deploye dint he event of
an accident and canno tp erform its intended
protectiv ef unction. Ap erson in the front-
passenger sea tc ould then, for example, come
into contact with the vehicle's interior, espe-
ciall yift he person is sitting too close to the
dashboard. Thi sp oses an increased ris ko f
injury or eve nf ata li njury.
Whe nt he front-passenger sea ti so ccupied,
always ensure that: R
the classification of the person in the front-
passenger sea ti sc orrect and the front-48
Occupan ts afety
Safety

Drivin gs af et ys ystems
Overview of drivin gs af et ys ystemsIn this section ,y ou will fin di nformati on about
th ef ol lowin gd rivin gs afet ys ystems :R
AB S( A nti-lock B rakin g S ystem)
( Y
page 61) R
BA S( B rak e A ssist S ystem) ( Y
page 61)R
Active Brak eA ss is t( Y
page 62 )R
ES P ®
( E lectronic S ta bility P ro gram)
( Y
page 64) R
EB D( E lectroni c B rak ef orce D istribution )
( Y
page 67 )R
ADAPTIV EB RAKE ( Y
page 68 )R
STEE RC ONTROL ( Y
page 68)
Important safet yn otesIf you fail to adapt your drivin gs ty le or if you are
inattentive ,t he drivin gs afet ys ystems can nei-
ther reduce th er is kofana cciden tn or override
th el aws of physics. Driving safet ys ystems are
merely aids designed to assist driving. You are
responsible fo rm aintainin gt he distanc etot he
vehicle in front, fo rv ehicle speed, fo rb raking in
goo dt im e, and fo rs ta yin ginl ane. Always adapt
your drivin gs ty le to suit th ep revailin gr oa da nd
weather condition sa nd maintain as af ed istanc e
from th ev ehicle in front. Drive carefully.
The drivin gs afet ys ystems described only wor k
as effectively as possible when there is ade-
quat ec ontac tb etween th et ir es and th er oa d
surface. Please pay special attention to th e
note sont ir es ,r ecommended minimum tire
tread depths, etc. ( Y
page 288).
In wintr yd rivin gc onditi ons, always use winte r
tires (M+ St ir es )a nd if necessary ,s now chains.
Onl yint hi sw ay will the driving safety systems
describe dint hi ss ection work as effectively as
possible.
ABS (Anti-lock Brakin gS ystem)
General information
ABS regulate sb rake pressure in such aw ay that
the wheels do not lock when yo ub rake. This
allows yo utoc ontinue steering the vehicl ew he n
braking. The % ABS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goe so ut when the engine is running.
ABS works from as peed of abou t5m ph
(8 km/h), regardless of road-surface conditions.
ABS works on slippery surfaces, eve nw he ny ou
onl yb rake gently.
Important safety notes
i Observe the "Important safety notes "s ec-
tio n( Y
page 61).
G WARNING
If ABS is faulty ,t he wheels could lock when
braking .T he steerability and braking charac-
teristic sm ay be severely impaired .A ddition-
ally ,f urther driving safety system sa re deac-
tivated .T here is an increased danger of skid-
ding and accidents.
Driv eonc arefully. Hav eA BS checked imme-
diately at aq uali fied specialist workshop.
Whe nA BS is malfunctioning ,o the rs ys tems,
including driving safety systems, will also
become inoperative. Observe the information
on the ABS warning lamp ( Y
page 220 )a nd dis-
play messages which ma ybes hown in the
instrument cluster ( Y
page 192).
Braking X
If ABS intervenes: continue to depress the
brake peda lv igorously unti lt he braking sit-
uatio ni so ver. X
To make af ul lb rake application: depress
the brake peda lw it hf ul lf orce.
If ABS intervene sw he nb raking ,y ou will fee la
pulsing in the brake pedal.
The pulsating brake peda lc an be an indication
of hazardou sr oa dc onditions, and functions as a
reminder to take extra car ew hile driving.
BAS (Brak eA ssis tS ystem)
General information
BAS operates in emergency braking situations.
If yo ud ep ress the brake peda lq ui ckly, BAS
automaticall yb oo sts the braking force ,t hus
shortening the stopping distance.Driving safety systems 61
Safety Z

Important safety notes
i Observ et he "Importan ts afet yn otes "s ec -
tion ( Y
page 61).
G WARNIN G
If BA Sism alfunctioning ,t he braking distanc e
in an emergenc yb raking situation is
increased. Ther eisar is kofana ccident.
In an emergenc yb raking situation ,d epress
th eb rak ep edal wit hf ull force .A BS prevents
th ew heels from locking.
Braking X
Kee pt he brak ep edal firmly depressed until
th ee mergenc yb raking situation is over.
AB Sp revents th ew heels from locking.
The brakes will function as usual once you
release th eb rak ep edal .B AS is deactivated.
Active Brak eA ssist
General information
i Observ et he "Importan ts afet yn otes "s ec -
tion ( Y
page 61).
Active Brake Assist consist sofad istanc ew arn -
ing function wit hana utonomous braking func-
tion and situation-dependen tb raking assis-
tance
Active Brake Assist can help you to minimiz et he
ris kofac ol lision wit ht he vehicl et ra veling in
fron torr educe th ee ffects of suc hac ol lision .
If Active Brake Assist detects that there is ar is k
of collision ,y ou will be warned visually and
acoustically. If you do no tr eac ttot he visual and
audible collision warning ,a utonomous braking
can be initiate dinc riti cal situations. If you apply
th eb rak ey ourself in ac riti cal situation ,A da p-
tive Brake Assist support sy ou wit hs ituation -
dependen tb raking assistance.
Important safety notes
Detection of hazardous situation sc an be par-
ticularly impaired if: R
there is dirt on th es ensor sora nythin ge lse
covering th es ensor sR
there is snow or heav yr ainR
there is interferenc ebyo th er radar source s R
there are stron gr adar reflections, for exam-
ple in parking garages R
an arrow vehicl eist ra veling in front, e.g. a
motorbike R
av ehicl eist ra veling in fron tonad ifferen tl in eR
you are driving an ew vehicl eors ervicing on
th eA ctiv eB ra ke Assist system has jus tb een
carrie do ut
Observ et he important safet yn otes in th e
"Breaking-in notes" section ( Y
page 121).
Followin gd amag etot he fron te nd of th ev ehicle,
hav et he configuration and operation of th e
radar sensor checke dataq ualified specialist
workshop. This also applie stoc ol lision satl ow
speeds wher enov isible damag etot he fron to f
th ev ehicl eisa pparent.
Activating/deactivating Active Brake Assist is active after every ignition
cycle.
You can activat eord eactivat eA ctiv eB ra ke
Assist ( Y
page 185) in th eo n-bo ard computer.
When deactivated, th ed istanc ew arning func-
tion and th ea utonomous braking function are
also deactivated.
If Active Brake Assist is deactivated, th e

You should therefore adapt your drivin gs tyle
to the differen th andlin gc haracteristics. Have
the brak es yste mc hecked at aq ualified spe-
cialist workshop.
Please observ et he information on warnin ga nd
indicator lamps ( Y
page 220)
( Y
page 220) as well as on display messages
( Y
page 194).
ADAPTIVE BRAKE ADAPTIVE BRAKE enhances braking safet ya nd
offers increased braking comfort .Ina ddition to
the braking function ,A DA PTIVE BRAKE also has
the HOL Df unction ( Y
page 157) and hill start
assist ( Y
page 125).
STEER CONTROL
Genera li nformationSTEER CONTROL helps you by transmitting a
noticeable steerin gf orc etot he steerin gw heel
in the direction required for vehicle stabilization.
This steerin ga ssistanc eisp rovided in particular
if: R
both right wheels or both left wheels are on a
wet or slippery road surfac ew hen you brakeR
the vehicle begins to skid
Important safet yn otes
i Observe the "Importan ts afet yn otes" sec-
tion ( Y
page 61).
No steerin ga ssistanc eisp rovided from STEER
CONTROL, if: R
ESP ®
is malfunctioningR
the steerin gism alfunctioning
If ESP ®
is malfunctioning, you will be assisted
further by the electrical power steering.
Protection against theft
Immobilizer
The immobilizer prevent sy our vehicle from
being started without the correc tS martKey. X
To activat ew ith th eS martKey: remove the
SmartKey from the ignition lock. X
To activat ew ith KEYLESS-GO start-func-
tion or KEYLESS-GO: switc ht he ignition off
and open the driver's door. X
To deactivate: switc hont he ignition.
When leaving the vehicle, always tak et he
SmartKey with you and lock the vehicle. Anyone
can star tt he engin eifav alid SmartKey has been
left inside the vehicle.
i The immobilizer is always deactivate dw hen
you star tt he engine.
In the even tt hat the engin ec annot be started
(yet the vehicle's battery is charged), the sys-
tem is not operational. Contact an authorized
Mercedes-Ben zC enter or call
1-800-FOR-MERCedes (in the USA )o r
1-800-387-010 0( in Canada).
ATA (anti-theft alar ms ystem)
X
To arm: lock the vehicle with the SmartKe yo r
KEYLESS-GO.
Indicator lamp C flashes. The alarm system
is armed after approximately 15 seconds. X
To disarm: unlock the vehicle with the Smart-
Key or KEYLESS-GO.
or X
Insert the SmartKe yi nt ot he ignition lock.
Av isual and audible alarm is triggered if the
alarm system is armed and you open: R
ad oor R
the vehicle with the mechanical key R
the trun kl id R
the hood68
Protection against theft
Safety

X
To turn the alarm off with the SmartKey:
press the 6 or 7 button on the Smart-
Key.
The alarm is stopped.
or X
Vehicles with KEYLESS-GO start-function
or KEYLESS-GO: remove the Start/Stop but-
ton from the ignition lock ( Y
page 122).X
Insert the SmartKey into the ignition lock.
The alarm is stopped. X
To sto pt he alarm using KEYLESS-GO:
grasp the outsid ed oo rh an dle. The SmartKey
must be outsid et he vehicle.
The alarm is stopped.
or X
Press the Start/Stop button on the dash-
board .T he SmartKey must be insid et he vehi-
cle.
The alarm is stopped.
The alarm is not switched off, eve nify ou close
the open door tha tt riggered it, for example.
i If the alarm continue sf or more than
30 seconds ,t he mbrace emergency cal ls ys -
tem automaticall yn otifie st he Customer
Assistance Center. Thi sisd on ee it her by text
message or data connection.
The emergency cal ls ys tem send st he mes-
sage or data provided that: R
yo uh av es ub scribed to the mbrace service.R
the mbrace service ha sb ee na ctivated
properly. R
the necessary mobil ep hone network is
available. Protectio na gains tt heft 69
Safety Z