2018 MERCEDES-BENZ CLA keyless

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

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

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

active for fiv em inute soru ntil th ed river' so r
front-passenger door is opened.
i When th eo verride feature for th es ide win-
dows is activated ( Y
page 60) ,t he side win-
dows canno tbeo perate df ro mt he rear.
Convenience opening Vehicles with KEYLESS-GO, th eK EYLESS-
GO star tf un ction, Exclusive package or
AMG Exclusive package: you can ventilate the
vehicle before you start driving.
The SmartKey can also be used to carry out the
followin gf unction ss imultaneously:R
unlock th ev ehicleR
open th es ide windowsR
open th ep anoram ar oo fw ith power tilt/slid-
ing pane la nd th er oller sunblind
The convenience opening feature can only be
operate du sin gt he SmartKey.
The "convenience opening "f eature is also avail-
able when th ev ehicle is unlocked.X
Vehicles with Exclusive package or AMG
Exclusive package but without KEYLESS-
GO and th eK EYLESS-GO star tf un ction: for
th ef ollowin go perations ,p oin tt he tip of the
SmartKey at th ed oor handle on th ed river's
door .T he SmartKey must be close to th ed riv-
er' sd oor handle.
i Vehicles with KEYLESS-GO or th eK EY-
LESS-GO star tf un ction: th eS ma rtKey must
be in close proximit yt ot he vehicle.X
Pres sa nd hold the 6 button until th es ide
windows and th ep anoram as unroo fa re in the
desired position.
If th er oller sunblin doft he panoram ar oof
with power tilt/slidin gp ane lisc losed, the
roller sunblin diso pened first.X
Pres sa nd hold the 6 button once more
until th ep anoram ar oo fw ith power tilt/slid-
ing pane lr eaches th ed esired position.X
To interrup tc onvenience opening: release
th e 6 button. Convenience closing feature
Important safety notes
G WARNING
When th ec onvenience closin gf eature is oper-
ating, part soft he body coul db ecome trapped
in th ec losin ga rea of th es ide window and the
slidin gs unroof. Ther eisar isk of injury.
Observ et he complet ec losin gp rocedure
when th ec onvenience closin gf eature is oper-
ating. Mak es ure that no body part sa re in
close proximit yd urin gt he closin gp rocedure.
Vehicles with KEYLESS-GO, th eK EYLESS-
GO star tf un ction, Exclusive Package or
AMG Exclusive Package: at th es ame tim ey ou
can: R
loc kt he vehicle R
close th es ide windows R
close th ep anoram ar oo fw ith power tilt/slid-
ing panel
On vehicle sw ith ap anoram ar oo fw ith power
tilt/slidin gp anel, you can then close th er oller
sunblind.
i Notes on th ea utomatic reversing feature
for: R
th es ide window ( Y
page 82)R
th ep anoram ar oo fw ith power tilt/sliding
pane l( Y
page 86) R
th er oller sunblin d( Y
page 87)
Using th eS martK ey X
Vehicles with Exclusive package or AMG
Exclusive package but without KEYLESS-
GO and th eK EYLESS-GO star tf un ction: for
th ef ollowin go perations ,p oin tt he tip of the
SmartKey at th ed oor handle on th ed river's
door .T he SmartKey must be close to th ed riv-
er' sd oor handle.
i Vehicles with KEYLESS-GO or th eK EY-
LESS-GO star tf un ction: th eS ma rtKey must
be in close proximit yt ot he vehicle.X
Pres sa nd hold the 7 button until th es ide
windows and th ep anoram ar oo fw ith power
tilt/slidin gp ane la re fully closed.X
Mak es ure that all th es ide windows and the
panoram ar oo fw ith power tilt/slidin gp anel
are closed.Sid ew indows 83
Opening and closing Z

On vehicles with ap anorama roof with power
tilt/sliding panel: X
Press and hold the 7 button agai nu ntil the
roller sunblind of the panorama roof with
power tilt/sliding panel closes. X
To interrup tc onvenienc ec losing: release
the 7 button.
Using KEYLESS-GO The driver's door and the door at which the han-
dle is used, must both be closed. The SmartKey
must be outside the vehicle. The gap between
the SmartKey and the corresponding door han-
dle should not be greater than 3ft(1m ).
X
Touch recessed sensor surface C on the
door handle until the side windows and the
panorama roof with power tilt/sliding panel
are fully closed.
i Make sure you only touch recessed sensor
surface C .X
Make sure that all the side windows are
closed. X
Make sure that all the side windows and the
panorama roof with power tilt/sliding panel
are closed. On vehicles with ap anorama roof with power
tilt/sliding panel: X
Touch recessed sensor surface C on the
door handle agai nu ntil the roller sunblind of
the panorama roof with power tilt/sliding
panel closes. X
To interrup tc onvenienc ec losing: release
recessed sensor surface C on the door han-
dle.
Resetting the side windows If as ide window can no longer be closed fully,
you must reset it. X
Close all the doors. X
Turn the SmartKey to position G or H in the
ignition lock ( Y
page 122). X
Pull the corresponding switch on the door
control panel until the side window is com-
pletely closed ( Y
page 82).X
Hold the switch for an additional second.
If the side window opens agai ns lightly:X
Immediately pull the corresponding switch on
the door control panel until the side window is
completely closed ( Y
page 82).X
Hold the switch for an additional second. X
If the respective side window remains closed
after the button is released ,t hen it has been
set correctly. If this is not the case, repeat the
steps above.
Problems with the side windows
G WARNING
If you close as ide window agai ni mmediately after it has been blocked or reset, the side window
closes with increased or maximum force. The reversing feature is then not active. Parts of the
body could be trapped in the closing area in the process. This poses an increased risk of injury or
even fatal injury.
Make sure that no parts of the body are in the closing area. To stop the closing process, release
the switch or push the switch agai ntor eopen the side window.84
Side windows
Opening and closing

Replacing the wiper blades
Important safety notes
G WARNING
If the windshield wiper sb egin to move while
yo ua re changing the wiper blades, yo uc ould
be trapped by the wiper arm .T here is ar is ko f
injury.
Alway ss witch off the windshield wiper sa nd
ignition before changing the wiper blades.
! To avoid damaging the wiper blades, make
sure that yo ut ouch only the wiper arm of the
wiper.
! Neve ro pe nt he hoo difaw in dshield wiper
arm ha sb ee nf olded away from the wind-
shield.
Neve rf ol daw in dshield wiper arm withou ta
wiper blad eb ac ko nto the windshield.
Hol dt he windshield wiper arm firmly when
yo uc hange the wiper blade. If yo ur elease the
windshield wiper arm withou taw ip er blade
and it falls onto the windshield ,t he windshield
may be damaged by the force of the impact.
Mercedes-Benz recommend st hat yo uh av e
the wiper blades changed at aq uali fied spe-
cialist workshop.
Changin gt he windshield wiper blades
Removin gt he wiper bladesX
Vehicles without KEYLESS-GO or KEY-
LESS-G Os tart function: remove the Smart-
Key from the ignition lock. X
Vehicles with KEYLESS-GO or KEYLESS-
GO start function: switch off the engine.X
Fol dt he wiper arm away from the windshield. X
Hol dontot he wiper arm with one hand. With
the othe rh an d, turn wiper blad eind ir ection
of arrow C away from the wiper arm as far as
it will go. X
Slide catch D in the direction of arrow