2021 MERCEDES-BENZ C-CLASS COUPE alarm

The sliding sun
roof cannot be closed and you
cann otsee the cause.
% The term "sliding sun roof" also refers to the
panorama sliding sunroof.
If th e sliding sunroof is obstructed during closing
and reopens again slightly: #
Immediately af ter auto matic reve rsing, pull
and hold the3 button down again tothe
point of resis tance until the sliding sunroof is
closed.
The sliding sunroof will be closed with
increased forc e.
If th e sliding sunroof is obstructed again and
opens again slightly: #
Repeat the pr evious step.
The sliding sunroof will be closed again with
increased forc e.
Ve hicles with a panorama sliding sunroof:
th e sliding sunroof or thero ller sunblind is
not operating smoo thly. #
Reset the sliding sunroof and thero ller sun‐
blind. Re
setting the sliding sunroof and thero ller
sunblind #
Pull and hold the3 button little bylittle
until the sliding sunroof is fully closed. #
Pull and hold the3 button little bylittle
until thero ller sunblind is fully closed. #
Use automatic operation tofully open and
th en 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 93)
R when tow- aw ay protection is triggered
(/ page 92)
The ATA system 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 Opening and closing
91

Indicator lamp
1flashes when theAT A sy stem
is primed.
The ATA sy stem is deactivated automatically in
th efo llowing situations:
R afte r unlocking theve hicle with thekey
R afte r unlocking theve hicle using KEYLESS-
GO R
afte r pressing thest art/ stop button with the
ke y in thestow age compartment
(/ page 146)
% 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 326).
Deactivating theATA #
Press theÜ, ßorp button on the
key.
or #
Press thest art/ stop button with theke y in
th estow age compartment (/ page146)
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 appro ximately 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 doors
R boot lid
To w- aw ay protection is automatically deactiva‐
te d:
R afte r pressing theÜ orp button on
th ekey
R afte r pressing thest art/ stop button with the
ke y in thestow age compartment
(/ page 146)
R afte r unlocking theve hicle using KEYLESS-
GO
R when using HANDS-FREE ACCESS
In fo rm ation on collision de tection on a pa rked
ve hicle (/ page173). 92
Opening and closing

Priming/deactivating
tow- aw ay protection Multimedia sy
stem:
4 Vehicle 5
î Vehicle settings
5 Tow-away protection #
Activate Oor deacti vate ª the function.
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. 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 doors
R boot lid
Interior pr otection is automatically deactivated:
R afte r pressing theÜ orp button on
th ekey
R afte r pressing thest art/ stop button with the
ke y in thestow age compartment
(/ page 146)
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 a side window is open
R when a panoramic sliding sunroof is open Priming/deactivating interior pr
otection Multimedia sy
stem:
4 Vehicle 5
î Vehicle settings
5 Interior motion sensor #
Activate Oor deacti vate ª the function.
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. Opening and closing
93

Ensu
rethefo 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 full.
St arting theve hicle (Remo teOnline) &
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 light sy stem is 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.
Af tereve ryengine start, the engine runs for
te n minu tes.
Yo u can car ryout a maximum of two consecu‐
tive starting attem pts. Yo u must start theve hicle
once with theke y before trying tostart the
engine again with the smartphone. you can stop
th eve hicle again at any time.
% 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 light sy stem.
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.
R Do not drive at speeds greater than
14 0 km/h.
R Drive theve hicle in drive program A
or ;.
R Shift tothe next highest gear at theve ry lat‐
est when the needle reaches the last third
before there d area in there v counter.
R Do not shift down a gear manually in order to
brake.
R Avoid overstraining theve hicle, e.g. driving at
full thro ttle.
R Do not depress the accelera tor pedal past
th e pressure point (kickdown).
R Only increase the engine speed gradually and
accelera tetheve hicle tofull speed af ter
1, 500 km. Driving and parking
147

Sy
stem limits
De tection may be restricted in thefo llowing sit‐
uations:
R theve hicle is damaged without impact, e.g. if
an outside mir ror is torn off or the paint is
damaged byakey
R an impact occurs at low speed
R the electric parking brake is not applied Note
s on parking up theve hicle If
yo u lea vetheve hicle par ked up for longer than
six weeks, it may suf fer dama gethro ugh disuse.
The 12V battery may also be impaired or dam‐
aged byheavy discharging.
% Further information can be obtained at a
qu alified specialist workshop. St
andby mode (extension of the star ter bat‐
te ry 's period out of use) St
andby mode function
% This function is not available for all models. If
standby mode is activated, ene rgy loss will be
minimised during extended pe riods of non-oper‐
ation.
St andby mode is characterised bythefo llowing:
R The star ter battery is preser ved.
R The maximum non-operational time appears
inthe media displa y.
R The connection toonline services is inter rup‐
te d.
R The ATA (anti-theft alarm sy stem) is una vaila‐
ble.
R The interior pr otection and tow- aw ay protec‐
tion functions are not available.
R The function for de tecting collisions on a
pa rked vehicle is not available.
If th efo llowing conditions are fulfilled, standby
mode can be activated or deactivated using the
multimedia sy stem:
R The engine is switched off.
R The ignition is switched on.
Exceeding theve hicle's displa yed non-opera‐
tional time may cause incon venience, i.e. it can‐ not be guaranteed
that thest ar ter battery will
re liably start the engine.
The star ter battery must be charge dfirs t in the
fo llowing situations:
R The vehicle's non-operational time must be
ex tended.
R The Battery charge insufficient for standby
mode messa geappears in the media displa y.
% Standby mode is automatically deactivated
when the ignition is switched on.
Ac tivating/deactivating standby mode
Multimedia sy stem:
4 Vehicle 5
î Vehicle settings
5 Standby mode
% This function is not available for all models. #
Activate Oor deacti vate ª the function.
When you activate the function, a prom pt
appears. #
Select Yes.
St andby mode is activated. 174
Driving and pa rking

Ad
justing treble, mid-range and bass
setting s................................................. 360
Calling up the sound menu.................... 360
Information............................................ 360
Switching volume adjustment on/of f.... 360
Af ter-sales service centre
see ASS YST PLUS
Air distribution Setting................................................... 13 5
Air freshener sy stem
see Fragrance sy stem
Air inlet see Air-water duct
Air pressure see Tyre pressure
Air suspension see AIRMATIC
Air vents
Ad justing (front).................................... 14 2
Ad justing (rear)..................................... .143
Air vents
see Air vents Ai
r-conditioning sy stem
see Climate control
Air-recirculation mode.............................. 137
Air-water duct Keeping free.......................................... 369
Airbag Activation................................................ 38
Fr ont airbag (driver, front passenger)...... 44
Ins tallation locations.............................. .44
Knee airbag............................................ .44
Overview................................................. 44
PA SSENGER AIR BAG indicator lamp....... 49
Pr otection................................................ 45
Re duced pr otection.................................46
Side airba g.............................................. 44
Wi ndow airba g......................................... 44
Airflow Setting................................................... 13 5
AIRM ATIC
Setting.................................................. .209
Suspension........................................... 208
Alarm sy stem
see ATA (anti-theft alarm sy stem) All-wheel drive
see 4MATIC
Alternative route
see Route
Ambient lighting Setting (MBUX multimedia sy stem)....... 12 9
Android Auto
Connecting a mobile phone (wireless).. .319
Ending.................................................... 319
Information............................................ 319
Overview................................................3 18
Sound settings....................................... 319
Tr ans ferred vehicle data........................3 20
Animals Pets in theve hicle................................... 70
Anti-lock braking sy stem
see ABS (Anti-lock Braking Sy stem)
Anti-skid chains
see Snow chains
Anti-theft pr otection
Ad ditional door loc k................................ .74
Immobiliser.............................................. 91504
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 ®
Connecting an iPhone ®
.......................... 317
Ending.................................................... 318
No tes..................................................... 317
Overview................................................ 317
Sound settings....................................... 318
Tr ans ferred vehicle data........................3 20
Assistance sy stems
see Driving saf ety sy stem
ASS YST PLUS
Battery disconnection pe riods.............. 362
Displaying the service due dat e............. 361
Fu nction/no tes...................................... 361
Re gular maintenance work.................... 361
Special service requirements............... .361
ATA (anti-theft ala rmsystem)
Deactivating the alarm............................ 92 Fu
nction.................................................. 91
Fu nction of interior pr otection................. 93
Priming/deactivating interior pr otec‐
tion.......................................................... 93
Priming/deactivating tow- aw ay pro‐
te ction..................................................... 93
To w- aw ay protection function.................. 92
AT TENTION ASSI ST
Fu nction................................................. 181
Setting................................................... 183
Sy stem limitations................................. 181
At tention assistant
see ATTENTION ASSIST
Au dio mode
Connecting USB device s....................... 338
Co pyrights............................................. 336
Information............................................ 334
Inserting/re moving an SD car d............. 336
Media sea rch........................................ .342
Overview............................................... 338
Pa use and playback function................ .339
Selecting a track................................... 339
Selecting playba ckoptions.................... 339
Switching on media mode..................... 336
Tr ack list............................................... .339 Au
thorised workshop
see Qualified specialist workshop
Au tomatic distance control
see Active Dis tance Assi stDISTRONIC
Au tomatic driving lights ...........................12 2
Au tomatic engine start (ECO start/
sto p function)............................................ 15 2
Au tomatic engine stop (ECO start/
sto p function)............................................ 15 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
Fu nction of the automatic front
passenger front airbag deactivation
sy stem..................................................... 47
PA SSENGER AIR BAG indicator lamp....... 49
Au tomatic mir rorfo lding function
Ac tivating/deactivating......................... 13 4
Au tomatic transmission
DIRECT SELECT le ver............................. 157 Index
505

Cruise control
Activating.............................................. 184
Buttons.................................................. 184
Calling up a spee d................................. 184
Deactivating.......................................... 184
Fu nction................................................ 183
Re quirements........................................ 184
Selecting............................................... 184
Setting a speed..................................... 184
St oring a speed.....................................1 84
Sy stem limitations................................. 183D
Dashboa rd
see Cockpit
Data acquisition Vehicle.................................................... 33
Data import/export Function/no tes..................................... 269
Importing/exporting............................. 270
Data pr otection rights
Data storage............................................ 36
Data storage
Data pr otection rights............................. 36 Electro
nic control units.......................... .33
Online services........................................35
Ve hicle.................................................... 33
Date Setting the time and date automati‐
cally....................................................... 264
Deactivating the alarm (A TA )...................... 92
Deale rship
see Qualified speciali stwo rkshop
Declaration of conformity Electromagnetic compatibility................. 25
Jack.........................................................28
Speci fic absor ption rate.......................... 25
TIREFIT kit............................................... 29
Wi reless vehicle components.................. 25
Decorative foil (cleaning instructions) ....372
DeNOx agent see AdBlue ®
De stination
Editing intermediate destinations......... .281
Editing the pr evious destinations.......... 292
Ex tern al................................................. 292
Saving (cur rent vehicle position)........... 292 Saving as a
favo urit e............................. 292
Saving asglobal favo urit e...................... 292
St oring a map position..........................2 92
Dest ination entry
En tering a 3 wordaddress..................... 282
En tering a POI or address...................... 277
Entering an intermedia tedestination.....2 81
Entering geo-coordinates......................2 82
Selecting a contact............................... 282
Selecting a POI...................................... 280
Selecting from the map......................... 283
Selecting pr evious destinations............ .280
De tecting inat tentiveness
see ATTENTION ASSIST
Diagnostics connection .............................. 29
Diesel Low outside temp eratures..................... 423
No tes....................................................4 23
Digital Owner's Manual .............................. 20
Digital TV
see TV
Dinghy towing
see Tow- bar sy stem 51 0
Index