MERCEDES-BENZ S-CLASS CABRIOLET 2019 Owner's Manual

The
wear pat tern s on the front and rear wheels
dif fer:
R Front wheels wear more on the shoulder of
th e tire
R Rear wheels wear more in the center of the
tire
On vehicles that ha vethe same size front and
re ar wheels, rotat eth e wheels according tothe
inter vals in the tire manufacturer's warranty
book in your vehicle documents. If this is not
av ailable, rotate the tires every
3,000 to6,000 mile s (5,000to10,000 km),
depending on thewe ar. Ensure that the direction
of rotation is maintained.
It is impe rative toobser vethe instructions and
saf ety no tes on "Changing a wheel" when doing
so Preparing theve hicle for a wheel
ch ange( →page 400). Note
s onstoring wheels When
storing wheels, obser vethefo llowing
no tes:
R Afterre moving wheels, store them in a cool,
dry and preferably dark place.
R Protect the tires from conta ct withoil, grease
or fuel. Overview of
the tire-chan getool kit Apart from some countr
y-specific variants, vehi‐
cles are not equipped with a tire-change tool kit.
Fo r more information on which tire-changetools
are requ ired and appr ovedfo r per form ing a
wheel change on your vehicle, consult a qualified
specialist workshop.
Re quired tire-change tools may include, for
ex ample:
R Jack
R Chock
R Lug wrench
R Alignment bolt The tire-change
tool kit is located under the
trunk floor. 1
Ratchet
2 Alignment bolt
3 Jack ing support
4 Jack
5 Lug wrench
6 Folding chock Wheels and tires
399

Setting up
thefo lding chock Prepa
ring theve hicle for a wheel change Re
quirements:
R The requ ired tire-change tool is available. If
yo ur vehicle is not equipped with the tire-
ch ange tool kit, consult a qualified specialist
wo rkshop tofind out about suitable tools. R
The vehicle is not on a slope.
R The vehicle is on solid, non-slippery and le vel
ground. #
Apply the electric parking brake manually. #
Movethe front wheels tothest ra ight-ahead
position. #
Vehicles with automatic transmission:
Shift into position 005D. #
Vehicles with le vel control sy stem: Setthe
normal vehicle le vel (→ page 180). #
Switch off the engine. #
Make sure that the engine cann otbe star ted. #
Place choc ks orother suitable items under
th e front and rear of the wheel that is diago‐
nally opposite the wheel you wish tochange. #
Remo vethe hub caps if necessary
(→ page 400). #
Raise theve hicle (→ page 401). Re
moving and in stalling hub caps Re
quirements:
R The vehicle is prepared for a wheel change
(→ page 400).
Pla stic hub cap #
Toremo ve:turn the center co ver of the hub
cap counter-clockwise and remo vethe hub
cap. #
Toinstall: make sure that the center co ver of
th e hub cap is turned counter-clockwise. #
Position the hub cap and turn the center
co ver clockwise until the hub cap engages
ph ysically and audibly. 400
Wheels and tires

Aluminum hub cap
#
Toremo ve:position soc ket2 on hub cap
1.
% The soc ket can be found in the tire-change
to ol kit. #
Position wheel wrench 3on soc ket2. #
Using wheel wrench 3, turn hub cap1
counter-clo ckwise and remo veit. #
Toinstall: position hub cap 1and turn until
it is comple tely flush with the wheel. #
Position soc ket2 on hub cap 1. #
Attach wheel wrench 3tosoc ket2 and
tighten the hub cap clockwise.
Specified tightening torq ue: 18lb-ft
(25 Nm). Ra
ising theve hicle when changing a wheel Re
quirements:
R There are no persons in theve hicle.
R The vehicle has been prepared for a wheel
ch ange (→ page 400).
R The hub caps ha vebeen remo ved
( → page 400).
Impor tant no tes on using the jack:
R Use only theve hicle-specific jack that has
been tested and appr ovedby Mercedes-Benz
to raise theve hicle.
R The jack is only designed forra ising and
holding theve hicle for a short time while a
wheel is being changed and not for mainte‐
nance workunder theve hicle. R
The jack must be placed on a firm ,fl at and
non-slip sur face. If necessar y,use a lar ge,
fl at, load-bearing, non-slip unde rlay.
R The foot ofthe jack must be positioned verti‐
cally under the jack support point. Ru
les of conduct when theve hicle is raised:
R Never place your hands or feet under the
ve hicle.
R Never lie under theve hicle.
R Do not start the engine and do not release
th e electric parking brake.
R Do not open or close any doors or the trunk
lid. Wheels and tires
401

#
Using the lug wrench, loosen the wheel bolts
on the wheel you wish tochange byabout
one full turn. Do not unscr ewthe bolts com‐
ple tely. Po
sition of jack support points &
WARNING Risk of inju ryfrom incor rect
positioning of the jack
If yo u do not position the jack cor rectly at
th e appropriate jacking point of theve hicle,
th e jack could tip with theve hicle raised. #
Only position the jack at the appropri‐
ate jacking point of theve hicle. The
base of the jack must be positioned ver‐
tically under the jacking point of the
ve hicle. *
NO
TEVehicle damage from the jack If
yo u do not position the jack cor rectly at
th e appropriate jack support point of the
ve hicle, the jack could tip over with theve hi‐
cle raised. #
The jack is designed exclusively for
jacking up theve hicle at the jack sup‐
port points. #
Take thera tchet out of the tire-change tool
kit and place it on the he xagon nut of the
jack so that the letters "AUF" are visible. 402
Wheels and tires

#
Position jack 2at jack support point 1.#
Turn ratchet 3clockwise until jack 2sits
comple tely on jack support point 1and the
base of the jack lies evenly on the ground. #
Turn ratchet 3until the tire is raised a maxi‐
mum of 1.2 in (3 cm) from the ground. #
Loosen and remo vethe wheel (→ page 403). Re
moving a wheel Re
quirements:
R The vehicle is raised (→ page 401).
Mercedes-AMG vehicles: observeth e no tes in
th e Supplement. Otherwise, you may not recog‐
nize dangers.
When changing a wheel, avoid applying any force
to the brake discs, since this could impair the
le ve l of com fort when braking.
* NO
TEDama getothre ading from dirt on
wheel bolts #
Do not place wheel bolts in sand or on
a dirty sur face. #
Unscr ew the uppermost wheel bolt com‐
ple tely. #
Screw alignment bolt 1instead of the
wheel bolt into theth re ading. #
Unscr ew there maining wheel bolts fully. #
Remo vethe wheel. #
Installth e new wheel (→ page 403). Mounting a new wheel
Re
quirements:
R The wheel is remo ved (→ page 403).
Mercedes-AMG vehicles: observeth e no tes in
th e Supplement. Otherwise, you may not recog‐
nize dangers. Wheels and tires
403

&
WARNING Risk of accident from losing a
wheel
Oiled, greased or damaged wheel bolt/wheel
nut thre ads or wheel hub/wheel mounting
bolt thre ads can cause the wheel bolts/
wheel nuts tocome loose.
As a result, you could lose a wheel while driv‐
ing. #
Never oil or grease theth re ads. #
Intheeve nt of damage totheth re ads,
con tact a qualified specialist workshop
immediatel y. #
Have the damaged wheel bolts or dam‐
aged hub thre ads replaced. #
Do not continue driving. #
Obser vethe information on thech oice of
tires (→ page 396).
Fo r tires with a specified direction of rotation, an
ar row onthe side wall of the tire indicates the
cor rect di rection of rotation. Obse rveth e direc‐
tion of rotation when ins talling. #
Slide the wheel tobe mounted onto the
alignment bolt and push it on. &
WARNING Risk of inju ryfrom tightening
wheel bolts and nuts
If yo u tighten the wheel bolts or wheel nuts
when theve hicle is raised, the jack could tip. #
Only tighten wheel bolts or wheel nuts
when theve hicle is on the ground. #
Be sure toobser vethe instructions and
saf ety no tes on "Changing a wheel"
(→ page 396). #
For saf etyre asons, on lyuse wheel bolts
which ha vebeen appr ovedby Mercedes-
Benz and forth e wheel in question.
* NO
TEDama getopaintwork of the wheel
ri m when scr ewing on thefirs t wheel bolt If
th e wheel has too much play when scr ew‐
ing in thefirs t wheel bolt, the wheel rim paint
can be dama ged. #
Press the wheel firm lyagainst the
wheel hub when scr ewing on thefirst
wheel bolt. #
Tighten the wheel bolts evenly in a diagonal
pattern in the order indicated until they are
fi nger-tight. #
Unscr ew the alignment bolt. #
Tighten the last wheel bolt until it is finger-
tight. #
Lowe rth eve hicle (→ page 404). Lo
weri ngtheve hicle af ter a wheel change Re
quirements:
R The new wheel has been ins talled
(→ page 403). #
Place thera tchet onto the he xagon nut of the
jack so that the letters "AB" are visible. #
Tolowe r the vehicle: turnthera tchet of the
jack counter-clo ckwise. 404
Wheels and tires

#
Tighten the wheel bolts evenly in a diagonal
pattern in the order indicated (1 to5 ).
Specified tightening torq ue: 111 lb-ft
(150 Nm). &
WARNING Risk of inju rythro ugh incor‐
re ct tigh tening torque
The wheels could come loose if the wheel
bolts or wheel nuts are not tightened tothe
prescribed tightening torque. #
Makesure the wheel bolts or wheel
nuts are tightened tothe prescribed
tightening torque. #
Ifyo u are not sure, do not mo vethe
ve hicle. Consult a qualified specialist
wo rkshop and ha vethe tightening tor‐
qu ech ecked immediately. #
Check the tire pressure of the newly moun‐
te d wheel and adjust according ly. #
Vehicles with a tire pressure monitoring
sy stem: Restart the tire pressure monitoring
sy stem (→ page 383).
Make sure toobser vethefo llowing fur ther rela‐
te d subjec t:
R Notes on tire pressure (→ page377) Wheels and
tires405

Note
s ontech nical data
Mercedes-AMG vehicles: observeth e no tes in
th e Supplement. Otherwise, you may not recog‐
nize dangers.
The da tastated on lyapplies tovehicles with
st andard equipment. You can obtain fur ther
information from an authorized Mercedes-Benz
Center. Ve
hicle electronics Tw
o-w ayradios Note
s on installing two-w ayradios &
WARNING Risk of accident due to
improper workon two-w ayradios
The elect romagnetic radiation from two-w ay
ra dios can inter fere with the on-board elec‐
tronics if RF transmit ters are manipulated or
re trofitted inco rrectly.
This could jeopardize the operating saf ety of
th eve hicle. #
You should ha veall workon electrical
and electronic components car ried out
at a qualified specialist workshop. &
WARNING Risk of accident from incor‐
re ct ope ration of two-w ayradios
If yo u operate two- wayra dios incor rectly in
th eve hicle, the electromagnetic radiation
could inter fere with the on-board electronics,
e.g.:
R ifth e two-w ayradio is not connec tedto
an exterior antenna
R ifth eex terior antenna is not cor rectly
mounted or is not of low reflection
This could jeopardies the operating saf ety of
th eve hicle. #
Have the lo w-reflection exterior
antenna ins talled at a qualified special‐
ist workshop. #
When operating two-w ayradios in the
ve hicle, alw ays connect them tothe
lo w- reflection exterior antenna. *
NO
TEInva lidation of the operating per‐
mit due tofailure tocomply wi th the
instructions for ins tallation and use The operating permit may be in
validated if
th e instructions for ins tallation and use of
two-w ayradios are not obser ved. #
Only use appr oved frequency bands. #
Obser vethe maximum permissible out‐
put po wer in these frequency bands. #
Only use appr oved antenna positions. 406
Tech nical da ta

1
Rear fende rs
On there ar fende rs, it is recommended that you
ins tallth e antenna on the side of theve hicle
closest tothe center of thero ad.
Use Tech nical Specification ISO/TS 21609 (Road
Ve hicles – "EMCs for ins tallation of af term arket
ra dio frequency transmitting equipment") when re
trofitting two-w ayradios. Comply with the
legal requirements for de tach able parts.
If yo ur vehicle has ins talling for two-w ayradio
equipment, use the po wer supp lyand antenna
connec tors prov ided in the pre-ins tallation.
Obser vethe manufacturer's supplements when
ins talling.
Tw o-w ayradio transmission output
The maximum transmission output (PEAK) at the
base of the antenna must not exceed theva lues
in thefo llowing table:
Fr equency band and maximum transmission
output Fr
equency band Maximum transmis‐
sion output
Sho rtwa ve
3 - 54 MHz 10
0 W
4 m waveband
74 -78 MHz 30 W Fr
equency band Maximum transmis‐
sion output
2 m waveband
14 4 - 174 MHz 50 W
Tr unked radio sys‐
te m/T etra
380 - 460 MHz 10 W
70 cm waveband
400 - 460 MHz 35 W
Tw o-w ayradio
(2G/3G/4G) 10 W The
following can be used in theve hicle without
re strictions:
R RF transmitters wi tha maximum transmis‐
sion output of up to100 mW
R RF transmitters with transmitter frequencies
inthe 380 - 410 MHz waveband and a maxi‐
mum transmission output of up to2 W
(trunked radio sy stem/T etra)
R Mobile phones (2G/3G/4G) Te
ch nical da ta407

There are no
restrictions when positioning the
antenna on the outside of theve hicle for some
wav ebands.
This applies tothefo llowing wavebands:
R Trunked radio sy stem/T etra
R 70 cm waveband
R 2G/3G/4G Ve
hicle identification plate, VIN and engine
number overview
Ve hicle identification plate Ve
hicle identification plate (USA only)
1 Perm issible grossweight
2 Perm issible front axle load
3 Perm issible rear axle load
4 Paint code
5 VIN (vehicle identification number) 408
Tech nical da ta