key MERCEDES-BENZ CLA 2018 Owner's Manual

Changing th es ettings of th el ocking
system You can chang et he settings of th el ockin gs ys-
tem. This mean st ha to nl yt he driver' sd oor and
th ef uel fille rf lap are unlocked when th ev ehicle
is unlocked. This is useful if you frequently travel
on your own. X
To change th es etting: pres sa nd hold the
6 and 7 buttons simultaneousl yf or
approximately six seconds until th eb attery
indicator lamp flashes twice ( Y
page 73).
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 no wf unction sasf ollows:X
To unlock: pres st he 6 butto no nc e.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 oor handle on th ef ront-pa ssenger
door or th er ear door.X
To lock centrally: touch th eo uter sensor
surface on on eoft he door handles.X
To restor et he factor ys ettings: pres sa nd
hold the 6 and 7 buttons simultane-
ously for approximately six seconds until the
battery check lamp flashes twice
( Y
page 73).
Mechanica lk ey
General notes
If th ev ehicle can no longer be locke do r
unlocked wit ht he SmartKey or KEYLESS-GO,
use th em echanical key.
If you use th em echanical ke yt ou nlock and
open th ed river' sd oor or th et ru nk lid, th ea nti-
theft alarm system will be triggered ( Y
page 68). Ther ea re several ways to tur no ff th ea larm:X
To deactivat et he alarm with th ek ey: press
the 6 or 7 butto nont he key.
or X
Inser tt he SmartKey int ot he ignition lock.
or X
To deactivat et he alarm with KEYLESS-GO:
pres st he Start/Sto pb utto nint he ignition
lock. The SmartKey must be in th ev ehicle.
or X
Loc koru nlock th ev ehicle usin gK EY LESS-
GO. The SmartKey must be outside th ev ehi-
cle.
If you unlock th ev ehicle usin gt he mechanical
key, th ef uel fille rf lap will no tbeu nlocked auto-
matically. X
To unlock th ef ue lf ille rf lap: insert the
SmartKey int ot he ignition lock.
Removing th em echanica lk ey
X
Push release catch C in th ed irection of the
arrow and at th es ame tim er emove mechan-
ical key D from th eS ma rtKey.
For further informatio na bout:R
Unlockin gt he driver' sd oor ( Y
page 77)R
Unlockin gt he trunk ( Y
page 81)R
Lockin gt he vehicle ( Y
page 77)
Insertin gt he mechanica lk eyX
Push mechanical key D completely int ot he
SmartKey until it engages and release
catch C is back in its basic position.72
SmartKey
Opening and closing

SmartKey battery
Important safety notes
G WARNING
Batteries contain toxic and corrosive substan-
ces. If batteries are swallowed, it can result in
severe health problems. There is ar isk of fatal
injury.
Keep batteries out of the reach of children. If
ab attery is swallowed, seek medical attention
immediately.
The SmartKey batteries contain perchlorate
material, which may require special handling
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 that you have the
battery replaced at aq ualified specialist work-
shop.
Checking the battery
X
Press the 7 or 6 button.
The battery is working properly if battery
check lamp C lights up briefly.
The battery is discharged if battery check
lamp C does not light up briefly.X
Change the battery ( Y
page 73).
i If the SmartKey battery is checked within
the signal reception range of the vehicle,
pressing the 7 or 6 button:R
locks or R
unlocks the vehicle
i You can get ab attery at any qualified spe-
cialist workshop. Replacing the battery You require aCR2 025 3Vc ell battery.X
Take the mechanical key out of the SmartKey
( Y
page 72).
X
Press mechanical key D into the opening in
the SmartKey in the direction of the arrow
until battery tray cover C opens. When doing
so, do not hold cover C shut.X
Remove battery tray cover C .
X
Repeatedly tap the SmartKey against your
palm until battery

Problems with the SmartKey Problem
Possible causes/consequences and P Solutions
You cannot lock or
unlock the vehicle using
the SmartKey. The SmartKey battery is discharged or nearly discharged. X
Vehicles without KEYLESS-GO or KEYLESS-GO star tf unction:
try again to lock/unlock the vehicle using the remote control func-
tion of the SmartKey. Point the tip of the SmartKey at the driver's
door handle from close range and press the 6 or 7 button.
If this does not work: X
Check the SmartKey battery ( Y
page 73) and replace it if necessary
( Y
page 73). X
Unlock ( Y
page 77) or lock ( Y
page 77) the vehicle using the
mechanical key.
There is interference from ap owerful source of radio waves.X
Vehicles without KEYLESS-GO or KEYLESS-GO star tf unction:
try again to lock/unlock the vehicle using the remote control func-
tion of the SmartKey. Point the tip of the SmartKey at the driver's
door handle from close range and press the 6 or 7 button.
If this does not work: X
Unlock ( Y
page 77) or lock ( Y
page 77) the vehicle using the
mechanical key.
The SmartKey is faulty. X
Unlock ( Y
page 77) or lock ( Y
page 77) the vehicle using the
mechanical key. X
Have the SmartKey checked at aq ualified specialist workshop.
You can no longer lock or
unlock the vehicle using
KEYLESS-GO. The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 73) and replace it if necessary
( Y
page 73).
If this does not work: X
Unlock ( Y
page 77) or lock ( Y
page 77) the vehicle using the
mechanical key.
There is interference from ap owerful source of radio waves.X
Unlock ( Y
page 77) or lock ( Y
page 77) the vehicle using the
mechanical key.74
SmartKey
Opening and closing

Problem
Possible causes/consequences and P Solutions
KEYLESS-GO is malfunctioning. X
Lock/unlock the vehicle using the remote control function of the
SmartKey. X
Have the vehicle and SmartKey checked at aq ualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function: X
Unlock ( Y
page 77) or lock ( Y
page 77) the vehicle using the
mechanical key. X
Have the vehicle and SmartKey checked at aq ualified specialist
workshop.
The engine cannot be
started using the Smart-
Key. The on-board voltage is too low. X
Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work: X
Check the starter battery and charge it if necessary ( Y
page 278).
or X
Jump-start the vehicle ( Y
page 278).
or X
Consult aq ualified specialist workshop.
The engine cannot be
started using the Start/
Stop button. The Smart-
Key is in the vehicle. The vehicle is locked. X
Unlock the vehicle and try to start the vehicle again.
The SmartKey battery is discharged or nearly discharged. X
Check the SmartKey battery ( Y
page 73) and replace it if necessary
( Y
page 73).
If this does not work: X
Start your vehicle with the SmartKey in the ignition lock.
There is interference from ap owerful source of radio waves.X
Start your vehicle with the SmartKey in the ignition lock.
You have lost aS mart-
Key. X
Have the SmartKey deactivated at aq ualified specialist workshop.X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well.
You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers. X
If necessary, have the locks changed as well. SmartKey 75
Opening and closing Z

Door s
Important safet yn otes
G WARNING
If children are lef tu nsupervised in th ev ehicle,
they could: R
ope nt he doors ,t hu se nd angerin go th er
people or road users. R
get out and disrup tt ra ffic .R
operat et he vehicle' se quipment.
Additionally, children could set th ev ehicle in
motion if, fo re xa mple, they:R
release th ep arking brake .R
shiftin gt he automatic transmissio no ut of
par kp osition PR
Start th ee ng ine.
There is ar is kofana cciden ta nd injury.
Whe nl eavin gt he vehicle, always take th e
SmartKey wit hy ou and loc kt he vehicle. Never
leav ec hi ldren or animals unattended in th e
vehicle. Always keep th eS ma rtKey out of
reach of children .
You should preferably plac el uggage or load si n
th ec argo compartment. Observ et he loadin g
guidelines ( Y
page 237).
Unlockin ga nd opening doors from
th ei nside
! The sid ew indows will no to pen/close if th e
battery is discharged or if th es id ew indows
hav ei ce du p. It will then no tbep ossible to
close th ed oor. Do no ta ttemp ttof orce th e
doo rc lo sed. You could otherwise damage th e
doo rort he sid ew indow.
Whe nad oo riso pened, th es id ew indow on that
sid eo pens slightly. Whe nt he doo risc lo sed, th e
sid ew indow close sa gain . X
To unlock an do pe naf ro nt door: pull doo r
handle D .
If th ed oo risl ocked, locking knob C pop su p.
The doo risu nlocke da nd opens .X
To unlock ar ea rd oor: pull up locking
knob C .
The doo risu nlocke da nd can be opened.X
To ope nar ea rd oor: pull doo rh andle D .
You can ope nad oo rf ro mi ns id et he vehicle
eve nifith as bee nl ocked. You can only ope nt he
rea rd oors from insid et he vehicle if they are no t
secure dbyt he child-proof locks ( Y
page 60).
If th ev ehicle has previously bee nl ocke dw it h
th eS ma rtKey from th eo utside, opening ad oo r
from th ei ns id ew ill trigger th ea nti-thef ta lar m
system. Switc ho ff th ea lar m( Y
page 68).
Centrally locking an du nl ocking th e
vehicle from th ei nsideYou can centrall yl oc koru nloc kt he vehicle from
th ei ns ide. Thi sc an be useful if you wish to loc k
th ev ehicle befor ep ulling away, fo re xa mple.
X
To unlock : press butto n C .X
To lock : press butto n D .
If all th ed oors and th et ru nk lid are closed, th e
vehicle locks .76
Doors
Opening an dc losing

Meanwhile, the fuel filler flap will not be locked
or unlocked.
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. You can open the rear
doors from inside the vehicle unless they are
secured by the child-proof lock ( Y
page 60).
If the vehicle has previously been locked with
the SmartKey from the outside, opening ad oor
from the inside will trigger the anti-theft alarm
system. Switch off the alarm ( Y
page 68).
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 locking but-
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 lockin gf eature
X
To deactivate: press and hold button C for
approximately five seconds until at one
sounds. X
To activate: press and hold button D for
approximately five seconds until at one
sounds.
If you press one of the two buttons and do not
hear at one, the relevant settin gh as already
been selected.
The vehicle is locked automatically when the
ignition is switched on and the wheels are turn-
ing. You could therefore lock yourself out if: R
the vehicle is being pushed R
the vehicle is being towed R
the vehicle is on ar oller dynamometer
You can also switch the automatic locking func-
tion on and off using the on-board computer
( Y
page 187).
Unlocking the driver's door (mechan-
ical key) If the vehicle can no longer be locked or
unlocked with the SmartKey or KEYLESS-GO,
use the mechanical key.
If you use the mechanical key to unlock and
open the driver's door, the anti-theft alarm sys-
tem will be triggered. Switch off the alarm
( Y
page 68). X
Take the mechanical key out of the SmartKey
( Y
page 72). X
Insert the mechanical key into the lock of the
driver's door as far as it will go.
X
Turn the mechanical key counter-clockwise
as far as it will go to position G .
The door is unlocked. X
Turn the mechanical key back and remove it. X
Insert mechanical key into the SmartKey
( Y
page 72).
Locking the vehicle (mechanical key)
If the vehicle can no longer be locked with the
SmartKey or KEYLESS-GO, use the mechanical
key. X
Open the driver's door. X
Close the front-passenger door, the rear
doors and the trunk lid. Doors 77
Opening and closing Z

X
Press the lockin gb utton on the driver’s door
( Y
page 76).X
Check whether the lockin gk nobs on the
front-passenger door and the rear doors are
still visible. Press down the lockin gk nobs by
hand, if necessary. X
Close the driver's door. X
Take the mechanical key out of the SmartKey
( Y
page 72).X
Insert the mechanical key into the lock of the
driver's door as far as it will go.
X
Turn the mechanical key clockwise as far as it
will go to position G .X
Turn the mechanical key back and remove it. X
Make sure that the doors and the trunk lid are
locked. X
Insert mechanical key into the SmartKey
( Y
page 72).
i If you lock the vehicle as described above,
the fuel filler flap is not locked. The anti-theft
alarm system is not armed.
Trunk
Important safety notes
G WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the
trunk lid is open when the engine is running,
especially if the vehicle is in motion .T here is a
risk of poisoning.
Always switch off the engine before opening
the trunk lid. Never drive with the trunk lid
open. G WARNING
If objects, luggage or loads are not secured or
not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is ar isk of injury, particu-
larly in the event of sudden braking or as ud-
den change in direction.
Always store object ssot hat they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey.
! The trunk lid swings upwards when opened.
Therefore, make sure that there is sufficient
clearance above the trunk lid.
The opening dimensions of the trunk lid can be
found in the "Vehicle data" section
( Y
page 320).
You should preferably place luggage or loads in
the trunk .O bserve the loading guidelines
( Y
page 237).
Do not leave the SmartKey in the trunk .Y ou
could otherwise lock yourself out.
The trunk lid can be: R
opened and closed manually from outside R
opened automatically from outside R
opened automatically from inside R
released with the emergenc yr elease from the
inside
Opening/closing from outside
Opening
X
Press the 6 button on the SmartKey. X
Pull handle C . X
Raise the trunk lid.78
Trunk
Opening and closing

Closing X
Pull down th et ru nk lid usin gh andle C .X
Let th et ru nk lid dro pi nt ot he lock.X
If necessary, loc kt he vehicle wit ht he 7
butto nont he SmartKey or wit hK EY LESS-GO.
Opening automatically from outside
Important safety notes
G WARNING
Combustion engines emit poisonous exhaust
gases suc hasc arbon monoxide. Exhaust
gases can ente rt he vehicle interio rift he
trunk lid is open when th ee ng in eisr unning,
especiall yift he vehicle is in motion .T her eisa
ris kofp oisoning.
Always switch off th ee ng in eb efore opening
th et ru nk lid. Never driv ew it ht he trunk lid
open.
! The trunk lid swings upward sw hen opened.
Therefore, mak es ure that there is sufficient
clearance abov et he trunk lid.
i The opening dimension soft he trunk lid can
be foun du nde r" Vehicle data" ( Y
page 320).
Opening automatically
You can open th et ru nk lid automaticall yu sing
th eS ma rtKey or th eh andle in th et ru nk lid.X
Press and hold the T butto nont he Smart-
Key until th et ru nk lid opens.
or X
If th et ru nk lid is unlocked, pull th et ru nk lid
handle and let it go again immediately. HANDS-FREE ACCESS
Important safety notes
G WARNING
The vehicle's exhaust system may be ver yh ot.
You coul db urn yourself by touching the
exhaust system if you use HANDS-FREE
ACCESS .T her eisar is kofi njury. Always
ensure that you only mak et he kickin gm ove-
men tw ithin th ed etection range of sensors.
! If th eS ma rtKey is within th er ear detection
range of KEYLESS-GO ,t he followin gs itua-
tions ,f or example ,c oul dl ead to th eu ninten-
tional opening of th et ru nk:R
usin gac ar wash R
usin gap ower washer
Mak es ure that th eS ma rtKey is at least 10 ft
(3 m) away from th ev ehicle.
i You can also deactivate KEYLESS-GO .F ur-
ther informatio nond eactivatin ga nd activat-
ing KEYLESS-GO ( Y
page 71).
General notes Wit hK EY LESS-GO and HANDS-FRE EA CCESS,
you can open th et ru nk lid without usin gy our
hands. This is useful if you have your hands full.
To do this, mak eak ickin gm ovement unde rt he
bumpe rw it hy our foot.
Observ et he followin gp oints:R
Carr yy our KEYLESS-GO ke ya bout your per-
son .T he KEYLESS-GO ke ym ust be in th er ear
detection range of th ev ehicle.R
When making th ek ickin gm ovement ,m ake
sure that you are standing firmly on the
ground and that there is sufficient clearance
to th er ear of th ev ehicle .Y ou coul do th erwise
lose your balance, for example on ice. Trunk 79
Opening and closing Z

R
Alway se nsure tha ty ou onl ym ak et he kicking
movement withi nt he detection range of sen-
sors C .R
Stand at leas t12in( 30 cm )a wa yf rom the
rea ra re aw hile doing so.R
Do not come into contact with the bumper
whil em ak ing the kicking movement. Other-
wise, the sensors ma yn ot functio nc orrectly.R
HANDS-FREE ACCESS does not functio nd ur -
ing engine start. R
Dirt caused by roa ds al ta round sensors C
ma yr estrict functionality.
Using the HANDS-FREE ACCESS with ap ros-
theti cl eg ma yr estrict functionality.R
If aK EYLESS-GO key is withi nt he rea rd et ec-
tio nr an ge of KEYLESS-GO ,H ANDS-FREE
ACCESS could be triggered .T he trun kl id
could thu sbeo pe ne du nintentionally, for
example, when you: -
set something down or lift something up
behind the vehicle. -
polish the rea roft he vehicle.
Do not carry the KEYLESS-GO key abou ty ou r
perso nint hes es it uations or in situations sim-
ilar to these. Thi sw il lp revent the uninten-
tional opening of the trun kl id . Operation X
To open: kick into sensor detection range C
belo wt he bumpe rw it hy ou rf oot.X
If the trunk li dd oe sn ot ope na fte rs ever al
attempts: wait at leas tt en second st hen
move your le gu nder the bumpe ro nce again.
If yo uh ol dy ou rf oo tu nder the bumpe rf or too
long, the trun kl id does not open. Repeat the leg
movement more quickl yift hi so ccurs.
Opening automaticall yf rom inside
Important safety notes
G WARNING
Combustion engine se mi tp oiso nou se xhaust
gases such as carbo nm onoxide. Exhaust
gases can ente rt he vehicl ei nterio rift he
trun kl id is open when the engine is running,
especially if the vehicl eisinm otion. There is a
ris kofp oiso ning.
Alway ss wi tch off the engine before opening
the trun kl id .N ever drive with the trun kl id
open.
! The trun kl id swing su pwar ds when opened.
Therefore ,m ak es ur et ha tt her eiss uf ficient
clearance above the trun kl id .
The opening dimensions of the trun kl id can be
found under "Vehicle data" ( Y
page 320).
Opening
Yo uc an open the trun kl id from the driver's seat
when the vehicl eiss tationar ya nd unlocked.80
Trunk
Opening and closing

X
To open: pull remote operating switch C for
the trunk li du nti lt he trunk li do pe ns.
Emergenc yr eleas ef or the trunk
General notes
! 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.
The opening dimensions of the trunk li dc an be
found in the "Vehicle data" section
( Y
page 320).
If the trunk li dc an no longer be unlocked:R
using the SmartKey ,o rR
using the remote operating switch in the door
contro lp an el:
Use the emergency release on the insid eoft he
trunk lid.
Yo uc an reach the emergency release via the
trunk.
Opening X
Fol dt he rea rs ea tb ac kres tf orwards
( Y
page 240). X
Insert as ui tabl et ool D ,e .g .as crewdriver,
into opening C in the paneling.
The trunk li disr eleased. X
Ope nt he trunk lid.
Emergenc yr eleas eb uttonYo uc an open the trunk li df rom insid et he vehi-
cle with the emergency release button.
X
Press emergency release button C briefly.
The trunk li du nlocks and opens.
The trunk li dc an be unlocke da nd opene dw it h
the trunk li de mergency release when the vehi-
cle is stationary or whil ed riving.
The trunk li de mergency release does not open
the trunk li dift he battery is disconnected or
discharged.
Trunk li de mergency release light: R
Emergency release button C flashe sf or
30 minutes afte rt he trunk li diso pe ned.R
Emergency release button C flashe sf or
60 minutes afte rt he trunk li disc losed.
Side windows
Important safety notes
G WARNING
While opening the side windows ,b od yp ar ts
could become trappe db et ween the side win-
do wa nd the door frame as the side window
moves. There is ar is kofi njury.
Make sure tha tn obod yt ouche st he side win-
do wd ur ing the opening procedure. If some-Side windows 81
Opening and closing Z