key battery MERCEDES-BENZ A-CLASS HATCHBACK 2018 Owners Manual

Key
Overview of
key functions &
WARNING Risk of accident and inju ry
due tochildren left unat tended in the
ve hicle
If ch ildren are left unat tended in theve hicle,
th ey could:
R open doo rs,th ereby endangering other
persons or road users.
R get out of theve hicle and be hit by
oncoming traf fic.
R ope rate ve hicle equipment and become
trapped, forex ample.
In addition, children could also set theve hi‐
cle in motion, forex ample, by:
R releasing the parking brake.
R shifting the automatic transmission out of
park position jor shifting manual trans‐
mission into idle position.
R starting the engine. #
Never lea vechildren and animals unat‐
te nded in theve hicle. #
When leaving theve hicle, alw aysta ke
th eke y with you and lock theve hicle.
This also applies tothe Digital Vehicle
Ke y if the "Digital Vehicle Key" function
is activated via Mercedes me connect. #
Keep theve hicle key out of reach of
ch ildren. This also applies tothe Digital
Ve hicle Key if the "Digital Vehicle Key"
function is activated via Mercedes me
connect. *
NO
TEDama getotheke y caused by
magnetic fields #
Keep theke yaw ay from strong mag‐
netic fields. 1
Locks
2 Battery check lamp
3 Unloc ks
% The key may vary from the one shown in the
diagram, depending on theve hicle equip‐
ment.
The key loc ksand unlo cksth efo llowing compo‐
nents:
R the doors
R the fuel filler flap
R theta ilgate Opening and closing
65

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 ( →page 67). Ac
tivating/deactivating the acoustic lo cking
ve rification signal Multimedia sy
stem:
, © .
Settings .
Vehicle #
Activate or deacti vate Acoustic lock . Ac
tivating/deactivating the panic alarm Re
quirements:
% The panic alarm function is only available in
cer tain countries.
R The ignition is switched off. #
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. 66
Opening and closing

#
Todeactivate: pressthe& button on the
ke y twice in quick succession.
The battery check lamp of theke yflashes
twice brief lyand lights up once. #
Toactivate: press any button on thekey.
% When theve hicle is star ted with theke y in
th estow age compartment of the cent recon‐
sole, theke y functions are automatical ly
activated (→ page154). Re
moving/inserting the eme rgency key #
Toremo ve:press release button 1.
Emer gency key2 is pushed out slight ly. #
Pull out emer gency key2 until it en gage s in
th e intermediate position.
% You can use the intermediate position of
emer gency key2 toattach theke yto akey
ri ng. #
Press release button 1again and fully
re mo veemer gency key2. #
Toinser t:press release button 1. #
Insert emer gency key2 tothe intermediate
position or fully until it engages.
% Depending on theve hicle's equipment, the
intermediate position is not available. Re
placing the key battery &
DANG ER Serious damage tohealth
caused byswallowing batteries
Batteries contain toxic and cor rosive sub‐
st ances. Swallowing bat teries may cause
serious damage tohealth.
There is a risk of fata l injur y. #
Keep batteries out of there ach of chil‐
dren. #
If batteries are swallo wed, seek medical
attention immediately. +
ENVIRONMEN
TALNO TEEnvironmental
dama gedue toimproper disposal of bat‐
te ries Batteries conta
in pollutants. It is
illegal todispose of them with the household
ru bbish. #
Dispose of batteries in an
environmen tally responsible manner.
Ta ke dischar ged batteries toaqu alified
specialist workshop or toa collection
point for used batteries. Opening and closing
67

Re
quirements:
R Yourequ ire a CR 2032 3 V cell batter y.
Mercedes-Benz recommends that you ha vethe
battery replaced at a qualified specialist work‐
shop. #
Remo vethe emer gency key ( → page 67). #
Press release button 2down fully and slide
co ver1 inthe direction of the ar row. #
Fold out co ver1 inthe direction of the
ar row and remo ve. #
Remo vebattery compartment 3and take
out the dischar ged batter y. #
Insert the new battery into battery compart‐
ment 3. Obser vethe positive pole marking
in the battery compartment and on the bat‐
te ry when doing this. #
Push in battery compartment 3. #
Re-attach co ver1 and push it until it
engages. Problems with
thekey Problem
Possible causes/consequences and M
MSolutions
Yo u can no lon ger lock or unlock the
ve hicle. Po
ssible causes:
R The key bat tery iswe ak or dischar ged.
R There is inter fere nce from a po werful radio signal source. 68
Opening and closing

Problem
Possible causes/consequences and M
MSolutions
R The key is faulty. #
Check the battery using the battery check lamp and replace if necessary (→ page67). #
Use the emer gency keyto lock or unlock (→ page67). #
Have theke ych ecked at a qualified specialist workshop.
Yo u ha velost a key. #
Have theke y deacti vated at a qualified specialist workshop. #
If necessar y,ha ve the mechanical lock changed as well. Doors
Note
s onthe additional door lock The additional door lock is only
available for
ve hicles forth eUni ted Kingdom. &
WARNING Risk of inju ryto persons
inside theve hicle when the additional
door lock is activated
If th e additional door lock is activated, the
doors can no longer be opened from the
inside. If
th ere are persons in theve hicle, they can
no longer le aveth eve hicle, e.g. in hazardous
situations. #
Never lea vepersons unattended in the
ve hicle, particularly children, elderly
persons or persons in need of help. #
Ifth ere are persons in theve hicle, do
not activate the additional door loc k. The additional door lock is automatically activa‐
te d in thefo llowing situations:
R The vehicle is loc ked using thekey.
R The vehicle is loc ked using KEYLESS-GO. If
th eve hicle has been loc ked via Mercedes me
connect, the additional door lock is not activa‐
te d.
If th e additional door lock is activated, the doors
cann otbe opened from the inside.
% After locking you can issue a signal with the
horn.
Yo u can pr eventthe additional door lock from
being activated bydeactivating interior pr otec‐
tion before locking theve hicle (→ page87). Opening
and closing 69

#
Tounlo cktheve hicle: touch the inner sur‐
fa ce of the door handle. #
Tolock theve hicle: touch sensor sur face
1 or2. #
Convenience closing: touch recessed sen‐
sor su rface 2until the closing procedure is
comple te. %
Further information on con venience closing
(→ page 78).
If yo u open theta ilgate from outside it is auto‐
matically unloc ked. Problems with KEYLESS-GO
Problem
Possible causes/consequences and M
MSolutions
Yo u can no lon ger lock or unlock the
ve hicle using KEYLESS-GO. Po
ssible causes:
R The key functions ha vebeen deactivated .
R The key bat tery iswe ak or dischar ged.
R There is inter fere nce from a po werful radio signal source.
R The key is faulty. #
Activate theke y functions (→ page 66). #
Check the battery using the battery check lamp and replace if necessary (→ page67). #
Use the emer gency keyto unlo ckor lock theve hicle (→ page67). #
Have theve hicle and keych ecked at a qualified specialist workshop. 72
Opening and closing

Problem
Possible causes/consequences and M
MSolutions
& WARNING Risk of becoming trapped or fata lly injured if reve rsing pr otection is not activated
If yo u close a side wind owagain immediately af ter it has been bloc ked or reset, the side window closes
with increased or maximum forc e. The reve rsing feature is then not active.
Pa rts of the body could become trapped in the closing area in the process. #
Make sure that no parts of the body are in the closing area. #
Tostop the closing process, release the button or press the button again toreopen the side win‐
do w. If a side window is obstructed during closing and
reopens again slightly: #
Immediately af terth e window is bloc ked, pull the cor responding switch again until the side window has
closed, and hold the switch for an additional second.
The side window will be closed with increased forc e.
If a side window is obstructed again during closing and reopens again slightly: #
Repeat the pr evious step.
The side window is closed without the automatic reve rsing function.
The side windo wscannot be opened or
closed using the con venience opening
fe ature. The
key bat tery iswe ak or dischar ged. #
Check the battery using the battery indicator lamp and replace if necessary (→ page67). Opening and closing
79

Display messages
Possible causes/consequences and M
MSolutions
 Change key batteries *T
hekey bat tery is dischar ged. #
Replace the battery (→ page67).
Â
Place the key in the
marked space See Owner's
Manual *T
hekey de tection function is malfunctioning. #
Change the location of theke y in theve hicle. #
Start theve hicle with theke y in the slot (→ page154).
,
Replace key See Owner's
Manual *
Ve hicles with a digital vehicle key:only a few or no authorisations remain forst arting the engine. #
Make sure that the internet connection is not limited bycer tain mobile phone settings. #
Open the Mercedes me connect http://www.mercedes.me and call up the digital vehicle key service. #
Deactivate the service firs t and then activate it again. #
Ifth e display message still appears, con tact the Mercedes-Benz Cus tomer Assis tance Center (C AC).
Ve hicles with a digital vehicle keyst icke r:on lyafe w or no authorisations remain forst arting the engine. #
Order a new digital vehicle keyst icke r from a Mercedes-Benz Service Centre or at http://www.mercedes-
benz.com/connect. 534
Display messa ges and warning/indicator lamps

Digital speedome
ter ............................... 255
Digital Vehicle Keyst icker
Locking theve hicle ................................ 70
St arting theve hicle ............................. 15 3
Un locking theve hicle ............................70
Dinghy towing
see Tow- bar sy stem
Dipped beam Changing bulbs .................................... 13 3
DIRECT SELECT le ver............................... 16 4
Engaging drive position ....................... 16 6
Engaging neutral .................................. 16 5
Engaging pa rkposition ........................ 16 5
Engaging pa rkposition automatically .. 16 5
Engaging reve rsege ar ........................ .165
Fu nction .............................................. 16 4
Display Care .................................................... 434
Display (MBUX multimedia sy stem)
Home screen ...................................... .282
Operating ............................................ 285
Display (multimedia sy stem)
Settings ................................................ 311Display (on-boa
rdcompu ter)
Displ ays on the multifunction display .. 253
Display content Displaying ............................................ 252
Display message .....................................4 98
Calling up (on-boa rdcompu ter) .......... .498
No tes .................................................. 498
Display messages ¯ - - - km/h .................................... 51 8
ç - - - km/h .................................... 517
È - - - km/h .................................... 519
# 12V battery See Owner's Man‐
ual ....................................................... 524
Ac tive Blind Spot Assi stcur rently
una vailable See Owner's Manual .........513
Ac tive Blind Spot Assi stinope rative ..... 516
Ac tive Blind Spot Assi stnot available
when towing a trailer See Owner's
Manual ................................................ .512
Ac tive bonnet malfunction See Own‐
er's Manual ......................................... 543Ac
tive Brake Assi stFunctions cur‐
re ntly limited See Owner's Manual .......511
Ac tive Brake Assi stFunctions limited
See Owner's Manual ............................511
Ac tive Dis tance Assi stavailable
again .................................................... 51 8
Ac tive Dis tance Assi stcur rently
una vailable See Owner's Manual .........518
Ac tive Dis tance Assi stinope rative ....... 51 8
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual .........514
Ac tive Lane Keeping Assist inopera‐
tive .......................................................5 15
b Active Light Sy stem inoperative ..546
Ac tive Parking Assist and
PA RKTRONIC inoperati veSee Own‐
er's Manual .......................................... 513
Ac tive Steering Assist cur rently
una vailable See Owner's Manual .........514
Ac tive Steering Assist inoperative ........513 57 0
Index

Ad
aptive Highbeam Assist cur rently
una vailable See Owner's Manual .........547
Ad aptive Highbeam Assist inopera‐
tive ...................................................... 547
Ad aptive Highbeam Assist Plus cur‐
re ntly una vailable See Owner's Man‐
ual ...................................................... .547
Ad aptive Highbeam Assist Plus inop‐
erative ................................................ .547
¯ AdBlue sy stem fault Engine
st art not possible ................................ 527
¯Ad Blue system fault Perf.
re duced in XXX miles See Owner's
Manual ................................................ 527
¯ AdBlue sy stem fault See Own‐
er's Manual ........................................ .527
4 Add 1 litre engine oil when next
re fuelling ............................................. 525
Anti-theft ala rmsystem Malfunction ...545 App
lybrake todeselect Park (P)
position ...............................................5 38
Apply brake toselect R ........................ 537
ÀAT TENTION ASSIST inoperative ...51 5
À ATTENTION ASSIS T:Take a
break! .................................................. 514
b Automatic driving lights inoper‐
ative .................................................... 547
Au xilia rybattery malfunction .............. 535
_Before starting the engine, turn
th esteering wheel. .............................. 542
Blind Spot Assi stcur rently una vaila‐
ble See Owner's Manual ......................512
Blind Spot Assi stinope rative ............... 513
Blind Spot Assi stnot available when
to wing a trailer See Owner's Manual ...5 15
Brake immediately ............................... 499
ÂChange key bat teries .................. 534
JCheck brake fluid le vel................ 504 ïCheck trailer hitch lock (white
display message) ................................ .539
hChe cktyre(s) ............................... 529
!Clean the fuel filter .................... .520
Clutch overheated Avoid pulling away
fo r XX:XX mins ................................... .536
?Coolant Stop vehicle Switch
engine off ............................................ 520
Cruise contro l and Limiter inope ra‐
tive ....................................................... 519
Cruise cont rol inope rative .................... 519
Cruise cont rol off ................................ .518
Cur rently una vailable Camera view
re stricted ............................................. 517
Cur rently una vailable Radar sensors
dirty .....................................................5 16
! currently una vailable See Own‐
er's Manual ........................................ .505
÷cur rently una vailable See Own‐
er's Manual ........................................ .499 Index
571