2018 MERCEDES-BENZ E-CLASS CABRIOLET engine coolant

Display messages
Possible causes/consequences and M
MSolutions #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120 °C.
Û
Please wait Charging high-
voltage battery *T
he 48 V battery is dischar ged. You ha veswitched on the ignition while the12 V battery was being charge d with a
suitable charge r or while ano ther vehicle was pr oviding starting assis tance.
The discha rged 48 V battery is charge d automatically via thevo ltage con verter. Af ter a few minutes, theMotor can
be started again display message will be shown on the multifunction displa y. #
Start the engine. #
Drive theve hicle for a while tocharge the12 V battery and the 48 V battery af ter disconnecting thech arger
from theve hicle.
If th eMotor can be started again display message does not appear af ter a few minutes: #
Tryto start the engine again. #
Ifth e engine does not start, consult a qualified specialist workshop.
#
48 V battery See Owner's
Manual *T
he 48 V sy stem is malfunctioning. Con venience functions may be restricted. #
Consult a qualified specialist workshop immediatel y.
8 *T
he fuel supply has dropped into there ser verange. #
Refuel. 500
Displaymessa ges and warning/indicator lamps

Ð
Po
we r-assis tedsteering malfunction
(→ page 538)
à AIR
BODY CONTROL malfunction
(→ page 533)
à DY
NA MIC BODY CONTROL malfunc‐
tion (→ page 533) ;
Engine diagnostics (→
page 534)
% Preglow
# Electrical
fault( →page 534)
8 Fu
elreser vewith fuel filler cap loca‐
tion indicator (→ page 534) ?
Coolant
too hot/cold (→ page 534)
h Ty
re pressure monitor (→ page 536)
ï Tr
ailer hit chis not operational or is
swivelling (→ page 538) Saf
ety sy stems Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
! Re d indicator lamp, elect ric
parking brake applied
!
Ye llow elect ric pa rking
brake indicator lamp is mal‐
functioning The
red elect ric pa rking brake indicator lamp flashes or is lit. The yellow indicator lamp is also lit if the electric parking
brake malfunctions. #
Obser vethe messages on the multifunction displa y. Displ
aymessa ges and warning/indicator lamps 527

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
8 Fu elreser ve wa rning lamp The
yellow fuel reser vewarning lamp is lit while the engine is running.
The fuel supply has dropped into there ser verange. #
Refuel.
?
Coolant warning lamp The
red coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The coolant le vel is too low
R The air supply tothera diator is obstructed
R The radiator fan is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120 °C. &
WARNING Danger of bu rns when opening the bonn et
If yo u open the engine bonn etwhen the engine has overheated or during a fire inthe engine compartment, you
could come into contact wi thhot gases or other escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the engine bonn etclosed and call thefire service. #
Stop theve hicle immediately, paying attention toroad and traf fic conditions, and switch off the engine. Do not con‐
tinue driving under any circums tances. Display messa
ges and warning/indicator lamps 535

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions #
Obser vethe messages on the multifunction displa y.
If th e coolant temp erature display is at the lo wer end of thete mp erature scale: #
Consult a qualified specialist workshop.
or #
Exit theve hicle and keep a safe dis tance from it until the engine has cooled down. #
Check the coolant le vel (→ page 398). #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that the
coolant temp erature display remains below 120 °C. Ty
res Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
h Ty re pressure monitoring
sy stem warning lamp lights
up The
yellow tyre pressure monitoring sy stem warning lamp (pressure loss/malfunction) is lit.
The tyre pressure monitoring sy stem has de tected tyre pressure loss in at least one of the tyres. 536
Display messages and warning/indicator lamps

COMAND Online
see Multimedia sy stem
COMAND Touch
Managing devices ................................ 295
Combination switch ................................12 9
Compass .................................................. 329
Compu ter
see On-board computer
Connection status
Displ aying ............................................ 360
Overview ............................................ .360
Connectivity Setting up a hotspot via business tel‐
ephony ................................................ 292
Swit ching transmission of theve hicle
position on/off .................................... 292
Contacts ................................................... 339
Calling up ............................................ 340
Deleting ............................................... 342
Downloading (from mobile phone) ...... 340
Importing ............................................. 341
Importing (o verview) ............................ 341
Information .......................................... 339 Making a call ......................................
.341
Na me form at ...................................... .340
Options ................................................ 341
St oring .................................................3 41
Controller Operating ............................................ 283
Con venience closing ................................. 87
Con venience opening ................................ 86
Coolant (engine) Check le vel .......................................... 398
No tes ................................................... 467
Cooling see Climate control
Co pyright ...................................................29
Cornering light ........................................ .131
Cross Traf fic Alert .................................. .234
Crosswind Assist Function/no tes ................................... 19 2
Cruise control .......................................... 19 8
Ac tivating ............................................ 200
Buttons ................................................ 200
Calling up a speed ............................... 200 Deactivating ........................................ 200
Fu
nction .............................................. 19 8
Re quirements ...................................... 200
Selecting ............................................ .200
Setting a speed ................................... 200
St oring a speed ................................... 200
Sy stem limitations ...............................1 98
Cup holder Rear ben chseat ................................... 121
Cup holder in the centre console
ins talling/ removing (auto matic
transmission) ....................................... 121 D
Dashboa rd
see Cockpit
Dashboard lighting see Instrument lighting
Data acquisition Vehicle .................................................. 26
Data import/export ................................ 296
Fu nction/no tes ................................... 296
Importing/exporting ............................2 97548
Index

¯
AdBlue sy stem fault Perf.
re duced: XXX mph No start in XXX
miles .................................................. .505
¯ AdBlue sy stem fault See Own‐
er's Manual ........................................ .504
4Ad d 1 litre engine oil when next
re fuelling ............................................. 503
Air conditioning Malfunction See
Owner's Manual .................................. 520
Apply brake todeselect Park (P)
position ...............................................5 07
App lybrake toselect R ....................... 508
ÀAT TENTION ASSIST inoperative ... 492
ÀAT TENTION ASSIS T:Take a
break! .................................................. 488
bAu tomatic driving lights inoper‐
ative .................................................... 524
Au xilia rybattery malfunction .............. 508
Beginning emer gency stop .................. 484 Blind Spot Assist cur
rently una vaila‐
ble See Owner's Manual ...................... 494
Blind Spot Assist inope rative ............... 488
Blind Spot Assi stnot available when
to wing a trailer See Owner's Manual ...4 91
Cann otstart engine See Owner's
Manual ................................................ 498
ÁChan gekey bat teries ...................5 14
J Check brake fluid le vel................ 477
Check brake pads See Owner's Man‐
ual ...................................................... .486
4Che ckeng. oil le v.when next
re fuelling ............................................. 503
ïChe cktrailer hitch lo ck(white
display message) .................................5 18
Check tyre pressures then restart
Ru n Flat Indicator ................................. 512
h Check tyre(s) .............................. .510
! Clean the fuel filter ...................... 497
J Close boot separator .................. 522 K
Convertible Top Operation pos‐
sible to60 km/h ................................. 522
?Coolant Stop vehicle Switch
engine off ............................................ 499
Cruise contro l and Limiter inope ra‐
tive ...................................................... 494
Cruise control inope rative ................... 494
Cruise control off ................................ 493
!cu rrently unavailable See Own‐
er's Manual .......................................... 479
÷ currently una vailable See Own‐
er's Manual .......................................... 473
5 Engine oil le vel cannot be
measured ............................................ 501
4Engine oil le velRe duce oil le vel...5 01
4 Engine oil le velSt op vehicle
Switch engine off ................................. 501
4Engine oil pressure Stop Switch
off engine ............................................ 502 Index
551

ÛPlease
wait Charging high- volt‐
age battery .......................................... 500
PRE- SAFE inoperati veSee Owner's
Manual ................................................ 483
Ra dar sensors dirty See Owner's
Manual .................................................4 78
_ Rear left seat backrest not
loc ked (Example) .................................. 51 5
h Rectify tyre pressure ....................51 0
Re duce speed ...................................... 512
Ø Refill Ad Blue Eng. start not pos‐
sible .................................................... 504
ØRe fill Ad Blue See Owne r’s Man‐
ual .......................................................5 04
!Re lease parking brake .................476
¸ Replace air cleaner ...................... 497
ÀRe placekey See Owner's Man‐
ual ........................................................ 514
Á Replace key ................................ .513
8 Reser vefuel le vel........................ 500 6Re
stra int sys. malfunction Con‐
sult workshop ...................................... 486
Re versing not poss. Consult work‐
shop ....................................................5 07
Risk of vehicle rolling Driver door
open and transmission not in P ...........507
Ru n Flat Indicator inope rative .............. 512
# See Owner's Manual ................... 496
Speed limit (winter tyres) XXX km/h ... 494
ÐSt eering malfunction Incre ased
ph ysical ef fort See Owner's Manual .....516
Ð Steering malfunction Stop
immediately See Owner's Manual ........516
St op vehicle Lea veengine running
Wa itTransmission cooling ...................506
#St opvehicle Lea veengine run‐
ning ..................................................... 497
#St opvehicle See Owner's Man‐
ual .......................................................4 98
ÉSt opvehicle Vehicle too low ........ 491 çsuspended
..................................4 93
bSwitch off lights .......................... 523
bSwitch on headla mps.................. 524
To shift out of P or N,depress brake
and start engine .................................. 507
K Top lo wering ............................... 522
ØTo p upAdBlue Perf.re duced in
XXX miles See Owner's Manual ...........506
Ø Top up AdBlue Perf.re duced:
XXX km/h Nostart in XXX km ............ 505
To p up coolant See Owner ’sManual ... 497
¥To p upwasher fluid ...................... 51 8
Tr af fic Sign Assi stCamera view
re stricted See Owner's Manual ........... 490
Tr af fic Sign Assi stcur rently una vaila‐
ble See Owner's Manual ...................... 489
Tr af fic Sign Assi stinope rative ............. 488
ïTr ailer coupling extending… .........51 5
Tr ansmission Malfunction Stop ........... 506 Index
553

Ne
utral
Engaging .............................................. 17 0
NFC see Near Field Communication (NFC)
No n-operational time
Ac tivating/deactivating standby
mode .................................................. .186
St andby mode function ...................... .186 O
Occupant saf ety
Pe ts in theve hicle ................................. 70
Occupant saf ety
see Airbag
see Automatic front passenger front
airbag shutoff
see PRE-SAFE ®
(anticipatory occu‐
pant pr otection)
see PRE-SAFE ®
PLUS (anticipatory
occupant pr otection plus)
see Restra int sy stem
see Seat belt
Odome ter
see Total dis tance Oil
see Engine oil
On-board co mputer ................................. 254
Assis tant displ aymenu ........................ 257
Displaying the service due date ........... 391
Head-up display menu .........................2 63
Media menu ........................................ 262
Menu designs ...................................... 255
Menu overview .................................... 254
Multifunction display .......................... .256
Na vigation menu ................................. 260
Operating ............................................ 254
Ra dio menu .......................................... 261
Service menu ...................................... 257
Te lephone menu .................................. 262
Tr ip menu ............................................ 258
On-boa rddiagno stics inter face
see Diagno stics connection
On-boa rdelectronics
Engine electronics .............................. .455
No tes .................................................. 455
Tw o-w ayradios .................................... 455
Open-source software .............................. 29 Opening
the boot lid using your foot
HANDS-FREE ACCESS .......................... .82
Operating fluids
Ad Blue ®
............................................... 464
Ad ditives (fuel) .................................... 462
Brake fluid .......................................... .466
Coolant (engine) .................................. 467
Engine oil ............................................ 465
Fu el (diesel) ......................................... 462
Fu el (petrol) ......................................... 461
No tes .................................................. 459
Wi ndsc reen washer fluid .................... .467
Operating saf ety
48 V on-boa rdelectrical sy stem ............ 21
Declaration of Conformity (electro‐
magnetic compatibility) ........................ .23
Declaration of conformity (ja ck) ............ 23
Declaration of con form ity (TIREFIT kit) .. 24
Declaration of conformity (wireless
ve hicle components) ............................. 23
EQ Boost ................................................ 21
Information ............................................ 21
Operating sy stem
see On-board computer 566
Index