2018 MERCEDES-BENZ A-CLASS SALOON alarm

The indicator lamp in
the door trim on the driv‐
er's side flashes when theve hicle is loc ked from
outside. The indicator lamp goes out if theve hi‐
cle is loc ked from inside or while theve hicle is in
motion.
If th eve hicle is not opened within appr oximately
40 seconds af ter unlocking, it loc ksagain. Anti-
th eft pr otection is primed again.
Do not keep theke yto ge ther with electronic
devices or me tal objects. This can af fect the
ke y's functionalit y.
% If battery check lamp 2does not light up
af te r pressing the% or& button, the
battery is dischar ged.
Re placing theke y bat tery ( / page75). Ac
tivating/deactivating the acoustic lo cking
ve rification signal Multimedia sy
stem:
4 © 5
Settings 5
Vehicle #
Activate or deacti vate Acoustic lock . Ac
tivating/deactivating the panic alarm Re
quirements:
R The ignition is switched off
% The panic alarm function is only available in
cer tain countries. #
Toactivate: press button 1for appro x‐
ima tely one second.
A visual and audible alarm is triggered. #
Todeactivate: briefly press but ton1 again.
or #
Press thest art/ stop button on the cockpit
(the key is inside theve hicle). Changing
the unlocking settings Po
ssible unlocking functions of theke y:
R cent ral unlocking
R unlocking the driver's door and fuel filler flap #
Toswitch between settings: pressthe
% and& buttons simultaneously for
appr oximately six seconds until the battery
ch eck lamp flashes twice.
If th e unlocking function forth e driver's door
and fuel filler flap has been selec ted:
R pressing the% button a second time cen‐
trally unloc kstheve hicle
R Vehicles with KEYLESS-GO: ifyo uto uch
th e inner sur face of the door handle on the
driver's door, only the driver's door and fuel
fi ller flap are unlo cked. Deactivating
theke y functions If
yo u do not use theve hicle or a keyfo r an
ex tended pe riod of time, you can reduce the
energy consum ption of there spective key.Todo
so, deactivate theke y functions. 74
Opening and closing

Problem
Possible causes/consequences and M
MSolutions
ro ller sunblind does not opera te
smoo thly. #
Pull and hold the3 button little bylittle until thero ller sunblind is fully closed. #
Use automatic operation tofully open and then close the sliding sunroof. Anti-theft pr
otection Fu
nction of the immobiliser The immobiliser pr
events your vehicle from
being star ted without the cor rect key.
The immobiliser is automatically activated when
th e ignition is switched off and deactivated when
th e ignition is switched on. ATA
(Anti-Theft Alarm sy stem) Fu
nction of theATA system
If th eATA system is primed, a visual and audible
alarm is triggered in thefo llowing situations:
R when a door is opened
R when the boot lid is opened
R when the bonn etis opened R
when interior pr otection is triggered
(/ page 96)
R when tow- aw ay protection is triggered
(/ page 95)
The ATA sy stem is primed automatically af ter
appr oximately ten seconds in thefo llowing situa‐
tions:
R afte r locking theve hicle with thekey
R afte r locking theve hicle using KEYLESS-GO Indicator lamp
1flashes when theAT A sy stem
is primed. 94
Opening and closing

The
ATA sy stem is deactivated automatically in
th efo llowing situations:
R afte r unlocking theve hicle with thekey
R afte r pressing thest art/ stop button with the
ke y in thestow age compartment
(/ page157)
R afte r unlocking theve hicle using KEYLESS-
GO
% When the Mercedes‑Benz emer gency call
sy stem is active and the alarm stay s on for
more than 30 seconds, a message is auto‐
matically sent tothe Cus tomer Assis tance
Centre (/ page 402).
Deactivating theATA #
Press the%, &orp button on the
key.
or #
Press thest art/ stop button with theke y in
th estow age compartment (/ page157)
Deactivating the ala rmusing KEYLESS-GO: #
Grasp the outside door handle with thekey
outside theve hicle. Fu
nction of tow- aw ay protection An audible and visual alarm is triggered if an
alteration
to yourvehicle's angle of inclination is
de tected while tow- aw ay protection is primed.
To w- aw ay protection is automatically primed
af te r about 60 seconds:
R afte r locking theve hicle with thekey
R afte r locking theve hicle using KEYLESS-GO
To w- aw ay protection is only primed when thefo l‐
lowing components are closed:
R the doors
R the boot lid
To w- aw ay protection is automatically deactiva‐
te d:
R afte r pressing the% orp button on
th ekey
R afte r pressing thest art/ stop button with the
ke y in thestow age compartment
(/ page157)
R afte r unlocking theve hicle using KEYLESS-
GO R
when using HANDS-FREE ACCESS
In fo rm ation on de tecting damage on a pa rked
ve hicle (/ page188). Priming/deactivating
tow- aw ay protection Multimedia sy
stem:
4 © 5
Settings
5 Schnellzugriff (Quick access) #
Prime or deactivate Tow-away protection .
To w- aw ay protection is primed again in thefo l‐
lowing cases:
R The vehicle is unloc ked again.
R A door is opened.
R The vehicle is loc ked again.
% Ifqu ick access is una vailable, select the
Vehicle submenu in theSettings main menu
to prime or deactivate tow- aw ay protection. Opening and closing
95

Fu
nction of interior pr otection When interior pr
otection is primed, a visual and
audible alarm is triggered if mo vement is de tec‐
te d in theve hicle interior.
Interior pr otection is primed automatically af ter
appr oximately ten seconds:
R afte r locking theve hicle with thekey
R afte r locking theve hicle using KEYLESS-GO
Interior pr otection is only primed when thefo l‐
lowing components are closed:
R the doors
R the boot lid
Interior pr otection is automatically deactivated:
R afte r pressing the% orp button on
th ekey
R afte r pressing thest art/ stop button with the
ke y in thestow age compartment
(/ page157)
R afte r unlocking theve hicle using KEYLESS-
GO
R when using HANDS-FREE ACCESS The
following situations can lead toafa lse
alarm:
R moving objects such as masc ots in theve hi‐
cle interior
R when the side window is open
R when the panoramic sliding sunroof is open Priming/deactivating interior pr
otection Multimedia sy
stem:
4 © 5
Settings
5 Schnellzugriff (Quick access) #
Prime or deactivate Interior motion sensor.
Interior pr otection is primed again in thefo llow‐
ing cases:
R The vehicle is unloc ked again.
R A door is opened.
R The vehicle is loc ked again.
% Ifqu ick access is una vailable, select the
Vehicle menu under Settingstoprime or
deactivate interior pr otection. 96
Opening and closing

Cha
rging the bat tery before commencing
yo ur journey
R Ifth eve hicle battery is discharged, you
re cei vea message on your smartphone.
R You can then start theve hicle with the
smartphone tocharge the batter y.
R The vehicle is automatically switched off
af te rte n minu tes.
Ensure thefo llowing before starting the engine:
R the legal stipulations in the area where your
ve hicle is par ked allow engine starting via
smartphone.
R it is safe tostart and runth e engine where
yo ur vehicle is par ked.
R the fuel tank is su fficiently filled. St
arting theve hicle &
WARNING Risk of crushing or entrap‐
ment due tounin tentional starting of the
engine
Limbs could be crushed or trapped if the
engine is star ted unintentionally during
service or maintenance work. #
Alw ays secure the engine against unin‐
te ntional starting before car rying out
maintenance or repair work. Re
quirements:
R park position jis selected.
R the anti- theft alarm sy stem is not activated.
R the panic alarm is not activated.
R the hazard warning lights are switched off.
R the bonn etis closed.
R the doors are closed and loc ked.
R the windo wsand sliding sun roof are closed. #
Start theve hicle using the smartphone: R
afte reve ryvehicle start, the engine runs for
te n minu tes.
R you can car ryout a maximum of two consec‐
utive starting attem pts. The vehicle must be
st ar ted once with theke y before trying to
st art theve hicle again with the smartphone.
R you can stop theve hicle again at any time.
R further information can be found in the
smartphone app.
Securing the engine against starting before
car rying out maintenance or repair work: #
switch on the hazard warning lights.
or #
unlock the doors.
or #
open a side window or the sliding sunroof. Ru
nning-in no tes To
preser vethe engine during thefirs t1, 500 km:
R drive at varying road speeds and engine
speeds. Driving and parking
15 9

Display messages
Possible causes/consequences and M
MSolutions #
Never drive with the boot lid open. #
Close the boot lid.
Anti-theft alarm system
Malfunction *T
he anti-theft alarm sy stem is malfunctioning. #
Consult a qualified specialist workshop.
¥ Top up washer fluid *T
hewasher fluid le vel in thewa sher fluid reser voir has dropped below the minimum. #
Top up thewa sher fluid (/ page 435). Climate cont
rol Display messages
Possible causes/consequences and M MSolutions
& inoperative See Owner's
Man. *T
hestationary heater is temp orarily malfunctioning. #
When theve hicle is on a le vel sur face and the engine has cooled down, make up tofour attem ptsto switch on
th est ationary heater, waiting se veral minutes between each attem pt. #
Ifth est ationary heater does not swit chon, consult a qualified specialist workshop. 556
Display messages and warning/indicator lamps

Ad
vanced sound sy stem
Ac tivating/deactivating au tomatic
vo lume adjustment .............................. 428
Ad justing the balance/fader ............... 428
Ad justing treble, mid-range and bass
settings ............................................... 428
Calling up the sound menu .................. 427
Information .......................................... 427
Af ter-sales service centre
see ASS YST PLUS
Air conditioning menu Calling up ............................................. 147
Air conditioning sy stem
see Climate control
Air distribution Setting ................................................ .145
Setting (multimedia sy stem) ................1 47
Air inlet see Air-water duct
Air pressu re
see Tyre pressure
Air vents ................................................... 15 3
Ad justing (front) .................................. 15 3Ad
justing (rear) .................................... 154
Air vents
see Air vents
Ai r-re circulation mode ............................ 14 8
Air-water duct .......................................... 436
Ke eping free ........................................4 36
Airbag ........................................................ .39
Ac tivation .............................................. 33
Fr ont airbag (driver, front passenger) ....39
Ins tallation locations ............................ .39
Knee airbag ........................................... 39
Overview ............................................... 39
PA SSENGER AIR BAG indicator lamp .... .43
Pr otection ..............................................40
Re duced pr otection ...............................41
Side impact airbag ................................ 39
Wi ndow airbag ....................................... 39
Ai rflow
Setting ................................................ .145
Alarm see Panic alarm
Alarm sy stem
see ATA (anti-theft alarm sy stem) Alternative
route
see Route
Ambient lighting Setting (multimedia sy stem) ................1 35
Android Auto ............................................ 395
Connecting a mobile phone ................. 396
Ending ................................................. 396
Information .......................................... 395
Overview ............................................. 395
Sound settings .................................... 396
Tr ans ferred vehicle data ......................3 96
Animals Pets in theve hicle ..................................71
Anti-lock braking sy stem
see ABS (Anti-lock Braking Sy stem)
Anti-skid chains
see Snow chains
Anti-theft ala rmsystem
see ATA (anti-theft alarm sy stem)
Anti-theft pr otection
Ad ditional door lock .............................. 77
Immobiliser ............................................ 94576
Index

Anti-theft pr
otection
see ATA (anti-theft alarm sy stem)
Anticipatory occupant pr otection
see PRE- SAFE®
(anticipatory occu‐
pant pr otection)
see PRE-SAFE ®
PLUS (anticipatory
occupant pr otection plus)
Apple CarPlay Trans ferred vehicle data ......................3 96
Apple CarPlay™ ....................................... 393
Connecting an iPhone ®
....................... 394
Ending ................................................. 395
No tes ................................................... 394
Overview ............................................. 393
Sound settings .................................... 395
Ashtr ay
Using ....................................................1 19
Assistance sy stems
see Driving saf ety sy stem
Assistant display Menu (on-board computer) .................. 261
ASS YST PLUS ........................................... 429
Battery disconnection pe riods .............4 30Displ
aying the service due date ........... 429
Fu nction/no tes ................................... 429
Re gular maintenance work .................. 429
Special service requ irements .............. 429
ATA (anti-theft ala rmsystem) .................. .94
Deactivating the alarm .......................... 95
Fu nction ................................................ 94
Fu nction of interior pr otection ............... 96
Priming/deactivating interior pr otec‐
tion ........................................................ 96
Priming/deactivating tow- aw ay pro‐
te ction ................................................... 95
To w- aw ay protection function ................95
AT TENTION ASSI ST.......................... 237, 238
Fu nction .............................................. 237
Setting ................................................. 238
Sy stem limitations ...............................2 37
At tention assistant
see ATTENTION ASSIST
Au gmented reality
see Route guidance with augmented reality
Au thorised workshop
see Qualified specialist workshop Au
tomatic distance control
see Active Dis tance Assi stDISTRONIC
Au tomatic driving lights .........................12 8
Au tomatic engine start (ECO start/
sto p function) .......................................... 16 2
Au tomatic engine stop (ECO start/
sto p function) .......................................... 16 2
Au tomatic front passen ger front air‐
bag deacti vation sy stem
see Automatic front passenger front
airbag shutoff
Au tomatic front passen ger front air‐
bag shu toff .......................................... 42, 43
Fu nction of the automatic front
passenger front airbag deactivation
sy stem ................................................... 42
PA SSENGER AIR BAG indicator lamp .... .43
Au tomatic mir rorfo lding function
Ac tivating/deactivating ...................... .143
Au tomatic transmission
DIRECT SELECT le ver ........................... 16 9
Drive prog ram display ......................... .165
Drive programs ................................... .164 Index
577