open bonnet MERCEDES-BENZ E-CLASS CABRIOLET 2021 Owners Manual

I
Active Distance Assist DISTRONIC →
198
T Diagnostics connection →
31
U Opens the bonnet →
299 V
! Electric parking brake →
180
W Light switch →
125 8
8
At
a glance – Cockpit

R
R
esol
esol ving pr
ving pr oblems wit
oblems wit h t
h the side windo ws
he side wind ows &
W
W ARNI NG
ARNI NGRisk of becoming trapped or
fata lly injured if reve rsing pr otection is not
activated
If yo u close a side window again immediately
aTer it has been bloc ked, the side window will
close with increased or maximum forc e. The
re ve rsing function is then not active and body
parts may become trapped. #
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 to
re open the side windo w. A side windo
A side windo
w canno
w cannot be closed and y
t be closed and y ou cannot
ou cannot
see t
see t he cause.
he cause. #
Che cktosee whe ther any objects are in the
wind owguide. #
Adjust the side windo ws.
A
A djus
djus ting t
ting t he side window
he side window s
s If a side window is obstructed during closing and
re
opens again immediatel y: #
Immediately aTer this, pull and hold the cor re-
sponding button again until the side window
has closed and hold the button for at least one
more second (re-adjustment).
The side window will be closed without the
automatic reve rsing function.
If th e side window is obstructed again and
re opens again immediatel y: #
Immediately aTer this, pull and hold the cor re-
sponding button again until the side window
has closed and hold the button for at least one
more second (follo w-up adjustment).
The side window will be closed without the
automatic reve rsing function.
The side window The side window s canno
s cannot be opened or closed
t be opened or closed
using t
using t he conv
he conv enience opening f
enience opening f eatur
eature.
e.
Po ssible causes:
R The key battery is weak or dischar ged. #
Check the battery using the indicator lamp
(/ page 74). #
Replace theke y batter y,if necessary
(/ page 76). Anti-t
Anti-theT
heTprot
pr otection
ection F
F
unction of t
unction of t he immobiliser
he immobiliser The immobiliser pr
events your vehicle from being
star ted without the cor rect key.
The immobiliser is automatically activated when
th eve hicle is switched o., and deactivated when
th eve hicle is switched on. A A
T
TA
A (Anti-
(Anti- TheT
TheT Alar
Alarm syst
m syst em)
em) F
F
unction of t
unction of t heAT
he ATA systA syst em
em
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 bonnet is opened
R when interior pr otection is triggered
(/ page 97) Opening and closing
95
95

R
It is safe tostart and runth e engine where
yo ur vehicle is par ked.
R The fuel tank is su1cient lyfull.
S
S t
tar
ar ting t
ting t he v
he vehicle (R
ehicle (R emot
emot e Online)
e Online) &
W
WARNING
ARNING Risk of crushing or entrapment
due tounintentional starting of the engine
Limbs could be crushed or trapped if the
engine is star ted unintentionally during service
or maintenance work. #
Always secure the engine against unin-
te ntional starting before ca rrying out
main tenance or repair work. R
R
eq
eq uir
uir ements:
ements:
R Park position jis selected.
R The anti-theT alarm system is not activated.
R The hazard warning light system is switched
o..
R The bonnet is closed.
R The doors are closed and loc ked.
R The windo wsand soT top are closed. #
Start theve hicle using the smartphone.
ATer every engine start, the engine runs for
te n minutes.
Yo u can car ryout a maximum of two consecutive
starting attem pts. You must start the engine with
th eke y before trying tostart theve hicle again
with the smartphone.
Yo u can switch o. theve hicle at any time as fol-
lo ws:
R Viath e Smartphone App
R By pressing theÜ orß button on the
key
% Further information can be found in the
smartphone app.
Secur
Secur ing t
ing the v
he vehicle ag
ehicle ag ains
ainst st
t star
arting bef
ting bef or
ore car ry-
e car ry-
ing out maint
ing out maint enance or r
enance or repair w
epair w or
ork:
k: #
Switch on the hazard warning light system.
or #
Unlock the doors.
or #
Open a side window or the soT top. R
R
unning-in not
unning-in not es
es To
preser vethe engine during the /rst 1,500 km:
R Drive at varying road speeds and engine
speeds.
R Do not drive at speeds greater than
140 km/h.
R Drive theve hicle in drive prog ram A
or ;.
R ShiT tothe next highest gear at theve ry latest
when the needle reaches the last third before
th ere d area in there v counter.
R Do not shiT down manual lyin order tobrake.
R Avoid overstraining theve hicle, e.g. driving at
full thro ttle.
R do not depress the accelerator pedal past the
pressure point (kickdown).
R Only increase the engine speed gradually and
accelerate theve hicle tofull speed aTer
1,500 km.
This also applies when the engine or parts of the
driv etra in ha vebeen replaced. 156
156
Driving and parking

#
Take cont rol of theve hicle and comple tethe
parking process.
% The vehicle path shown on the media display
may di.er from the actual vehicle path. The
turn signal indicator is switched on automati-
cally when theex iting procedure begins.
Yo u are responsible for selecting the turn signal
indicator in accordance with the tra1c condi-
tions. If necessar y,select the turn signal indicator
accordingl y.
P
P ausing A ausing A ctiv
ctive P
e Par
arking Assist
king Assist
Yo u can inter rupt the parking or exiting procedure
of Active Parking Assist byper form ing one of the
fo llowing actions, forex ample: #
depressing the brake pedal #
opening the front passenger door, a rear door,
th e boot or the bonnet #
applying the electric parking brake or activat-
ing the HOLD function #
T
To r
o r esume t
esume t he par
he parking or e
king or e xiting pr
xiting procedur
ocedure:
e:
ge ntly dep ress the accelerator pedal.
% Ifth e electric parking brake was applied
before Active Parking Assist was activated, depress
the accelerator pedal lightly tostart
th e parking or exiting procedure.
Check the area around your vehicle again before
re suming a paused parking procedure. Make sure
th at persons, animals or objects are no lon ger in
th e manoeuvring range. Also obser vethe system
limitations of Active Parking Assist.
A
A ut
ut omatic br
omatic br aking function of A
aking function of A ctiv
ctive P
e Par
arking
king
Assist
Assist
Pe rsons or objects de tected in the manoeuvring
ra nge could cause theve hicle tobrake sharply
and inter rupt the parking or exiting procedure.
The vehicle will then be held at a standstill. If you
depress the accelerator pedal, the parking or exit-
ing procedure is resumed.
Check the area around your vehicle again before
re suming the parking or exiting procedure. Make
sure that persons, animals or objects are no lon-
ge r in the manoeuvring range. Also obser vethe
system limi tations of Active Parking Assist. Manoeuvr Manoeuvr
ing assist
ing assistant
ant F
F
unction of Dr
unction of Dr iv
ive Awa
e Away Assi st
y Assi st
Drive Away Assist can reduce the se verity of an
impact when pulling away.If an obs tacle is de tec-
te d in the direction of tr avel, theve hicle's speed
is brie0y reduced toappr ox. 2 km/h. If a critical
situation is de tected, theÉ symbol appears in
th e media displa y.
Drive Away Assist can be deactivated or activated
in theManoeuvring assistance menu
(/ page 237).
% You can cancel an inter vention byDrive Away
Assist at any time bydeactivating Parking
Assist PARKTRONIC (/ page 230). &
W
WARNI NG
ARNI NGRisk of accident caused bylimi-
te d de tection per form ance of Drive Away
Assist
Drive Away Assist cannot alw ays clear lyiden-
tify objects and tra1c situations. #
Always pay careful attention tothe tra1c
situation; do not relyon Drive Away
Assist alone. Driving and parking
235
235

R
Frequent operation in mountainous terrain or
on poor road sur faces
R When the engine is oTen leT idling for long
periods
R Operation in particular lydusty conditions
and/or if air-recirculation mode is frequently
used
In these or similar operating conditions, ha vethe
interior air /lter, air /lter, engine oil and oil /lter,
fo rex ample, changed more frequentl y.The tyres
must be checked more frequently if theve hicle is
operated under increased loads. Further informa-
tion can be obtained at a quali/ed specialist work-
shop. Batt Batt
er
ery disconnection per
y disconnection per iods
iodsThe AS
SYST PLUS service inter val display can cal-
culate the service due date only when the battery
is connected. #
Display and no tedown the service due date
on the inst rument display before disconnect-
ing the battery (/ page 298). Engine com
Engine com
par
partment
tment A
A
ctiv
ctiv e bonne
e bonne t (pedes
t (pedestr trian pr ot
ian pr otection)
ection) Oper
Oper
ation of t
ation of t he activ
he active bonne
e bonne t (pedes
t (pedestr trian pr ot
ian pr otec-
ec-
tion)
tion)
In cer tain accident situations, the actuation of the
active bonnet reduces therisk of injury topedes-
trians. The rear area of the bonnet is raised by
appr oximately 80 mm.
ATer being triggered, the active bonnet remains in
th era ised position. Limited visibility due tothe
ra ised bonnet cannot be ruled out.
ATer the active bonnet has been actuated, pedes-
trian pr otection may be limited.
Ha ve the full functionality of the active bonnet
re stored immediatel y in aquali/ed specialist
wo rkshop.
If necessar y,adjust your seat position and drive
carefully toaqu ali/ed specialist workshop. If a
safe continued jou rney is not possible, contact a
qu ali/ed specialist workshop. Opening and closing t Opening and closing t
he bonnet
he bonn et &
W
WARNI NG
ARNI NGRisk of accident due todriving
with the bonnet unloc ked
The bonnet may open and blo ckyour vie w. #
Neverre lease the bonnet when driving. #
Before every trip, ensure that the engine
bonnet is loc ked. &
W
WARNING
ARNING Risk of accident and inju ry
when opening and closing the bonnet
The bonnet may suddenly drop into the end
position.
There is a risk of injury for an yone in the
engine bonnet's range of mo vement. #
Do not open or close the bonnet if there
is a person in the bonnet's range of
mo vement. Maintenance and care
299 299

&
W
WARNI NG
ARNI NGRisk of burns when opening the
bonnet
If yo u open the bonnet in theev ent of an over-
heated engine or /re in the engine compart-
ment, thefo llowing situations may occur:
R You may come into contact with hot gases.
R You may come into contact with other
escaping hot operating 0uids. #
Before opening the bonnet, allow the
engine tocool down. #
Intheev ent of a /re in the engine com-
partment, keep the bonnet closed and
call the /re service. &
W
WARNING
ARNING Risk of injury due tomoving
parts
Components in the engine compartment may
continue torun or start unexpectedly even
when the drive system is switched o..
Obser vethefo llowing if you must open the
bonnet: #
Switch o. theve hicle. #
Neverto uch the danger zones sur round-
ing moving components, e.g. thero tation
area of thefa n. #
Remo vejewe llery and watches. #
Keep items of clo thing and hair away
from moving pa rts. &
W
WARNING
ARNING Risk of injury from touching
components under voltage
The ignition system and the fuel injection sys-
te m operate at high voltage. You could receive
an elect ric shoc k. #
Neverto uch ignition system or fuel injec-
tion system components when theve hi-
cle is switched on. The live components include
thefo llowing, for
ex ample:
R Ignition coils
R Fuel injectors R
Electric lines tothe ignition coils and the fuel
injectors &
W
WARNING
ARNING Risk of burns from hot compo-
nent parts in the engine compartment
Cer tain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of theex haust system. #
Allow the engine tocool down and only
to uch component parts described in the
fo llowing. &
W
WARNING
ARNING Risk of injury from using the
windscreen wipers when the bonnet is
open
If th e windscreen wipers start moving when
th e bonnet is open, you could be trapped by
th e wiper linkage. #
Always switch o. the windscreen wipers
and theve hicle /r stifyo u need toopen
th e bonnet. 300
300
Maintenance and care

Opening t
Opening t
he bonnet
he bonnet #
Torelease the bonnet, pull on handle 1. #
Push handle 1ofthe bonnet catch upwards
and liT the bonnet until it opens automaticall y.
Closing t
Closing t he bonnet
he bonnet #
Lowe rth e bonnet toa height of around 20 cm
and then allow it tofall, applying a little force
as you let it go. #
Ifth e bonnet can still be liTed slightl y,open
th e bonnet again and close it with a little more
fo rc e until it engages cor rectl y. Engine oil
Engine oil
Chec
Chec
king t
king t he engine oil lev
he engine oil lev el using t
el using the on-board
he on-board
com
com put
puter
er
R
R eq
eq uir
uir ements:
ements:
R The engine has been warmed up.
R The vehicle is par ked on a le vel sur face.
R The engine is running at idle speed.
R The bonnet is closed.
The engine oil le vel is de term ined during driving.
De term ining the engine oil le vel can take up to
30 minutes with a normal driving style and even
longer with an active driving style. Maintenance and care
301
301

On-board computer:
4 Service 5
Engine oil level
One of thefo llowing message s will appear onthe
inst rument displa y:
R Engine oil level Measuring now: measu rement
of the oil le vel is not yet possible. #
Repeat there qu est aTer a maximum of
30 minutes' driving.
R Engine oil level OK andthe bar display for
indicating the oil le vel on the inst rument dis-
play is green and is between "min" and "max":
th e oil le vel is cor rect.
R Engine oil level Add 1,0 l andthe bar display
fo r indicating the oil le vel on the inst rument
display is orange and is below "min": #
Add 1 l of engine oil.
R Reduce engine oil level andthe bar display for
indicating the oil le vel on the inst rument dis-
play is orange and is abo ve"max": #
Drain o. any excess engine oil that has been
added. Todo so, consult a quali/ed specialist
wo rkshop.
R For engine oil level turn on ignition #
Switch on theve hicle tocheck the engine oil
le ve l.
R Engine oil level System inoperative: The oil
le ve l sensor is defective or not connected. #
Consult a quali/ed specialist workshop.
R Engine oil level System currently unavail. #
Close the bonnet.
T
T opping up engine oil
opping up engine oil &
W
WARNING
ARNING Risk of burns from hot compo-
nent parts in the engine compartment
Cer tain component parts in the engine com-
partment can be very hot, e.g. the engine, the
cooler and parts of theex haust system. #
Allow the engine tocool down and only
to uch component parts described in the
fo llowing. &
W
WARNING
ARNING Risk of /re and injury from
engine oil
If engine oil comes into contact with hot com-
ponent parts in the engine compartment, it
may ignite. #
Make sure that no engine oil is spilled
next tothe /ller opening. #
Allow the engine tocool o. and thor-
oughly clean the engine oil from compo-
nent parts before starting theve hicle. *
N
NOOTE
TE Engine damage caused byan inco r-
re ct oil /lter, incor rect oil or additi ves #
Do not use engine oils or oil /lters which
do not cor respond tothe speci/cations
ex plicitly prescribed forth e service inter-
va ls. #
Follow the inst ructions on the service
inter val display forch anging the engine
oil and obser vethe prescribed change
inter vals. #
Do not use additives. 302 302
Maintenance and care

R
Always make sure that nei ther you nor the bat-
te ry is electrostatically charge d.
R Keep awa y from /re and naked 0ames.
R Do not lean overth e batter y.
Obser vethe additional following points when
ch arging the batter y:
R Only use battery charge rs tested and
appro vedfo r Mercedes-Benz.
R Read the battery charge r's operating inst ruc-
tions before charging the batter y.
Obser vethe additional following points during
starting assistance:
R Starting assis tance may only be pr ovided
using vehicles, batteries or other jump start
devices with a nominal voltage of 12 V.
R The vehicles must not touch.
R V
V ehicles wit
ehicles wit h a pe
h a petr
trol engine:
ol engine: jump-start the
ve hicle only when the engine and exhaust sys-
te m are cold. S
S
t
tar
ar ting assist
ting assist ance and c
ance and c har
harging t
ging t he 12 V batt
he 12 V batt ery
ery R R
eq eq uir
uir ements:
ements:
R The vehicle is secured with the electric par k-
ing brake.
R V
Vehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: the
transmission is in position j.
R The vehicle and all elect rical consume rsare
switched o..
R The bonnet is open. Example: engine compartment
#
Slide co ver1 of positive contact 2onthe
jump-starting connection point in the direction
of the ar row. #
Connect positive contact 2onyour vehicle
to the positive term inal of the donor battery
using the jump lead/charging cable. Alw ays326
326
Breakdown assistance

*
N
N O
OTE
TE Damage or malfunctions caused by
moisture Moisture may cause damage
tothe electrical
system or cause it tomalfunction. #
When the fuse box is open, make sure
th at no moisture can enter the fuse box. #
When closing the fuse box, make sure
th at the seal of the lid is positioned cor-
re ctly on the fuse box. If
th e ne wlyinser ted fuse also blo ws, ha vethe
cause traced and recti/ed at a quali/ed specialist
wo rkshop.
Ensure thefo llowing before replacing a fuse:
R The vehicle is secured against rolling away.
R All electrical consume rsare switched o..
R theve hicle is switched o..
The elect rical fuses are located in various fuse
bo xes:
R Fuse box in the engine compartment on the
driver's side (/ page 333) R
Fuse box on the driver's side of the cockpit
(/ page 334)
R Fuse box in the front passenger foot we ll
(/ page 334)
R Fuse box in the boot on theright-hand side of
th eve hicle, when vie wed in the direction of
tr ave l (/ page 334) Opening and closing t
Opening and closing t
he fuse bo
he fuse box in t
x in the engine
he engine
com
com par
partment
tment R
R
eq
eq uir
uir ements:
ements:
R A dry clo thand a scr ewdriver are available.
Obser vethe no tes on elect rical fuses
(/ page 332).
Opening
Opening &
W
WARNING
ARNING Risk of injury from using the
windscreen wipers when the bonnet is
open
If th e windscreen wipers start moving when
th e bonnet is open, you could be trapped by
th e wiper linkage. #
Always switch o. the windscreen wipers
and theve hicle /r stifyo u need toopen
th e bonnet. #
Turn clips 2on co ver1 aqu arter-turn to
anti-clockwise. #
Pull co ver1 upwards in the direction of the
ar ro w. Breakd
own assistance
333
333