2018 MERCEDES-BENZ C-CLASS CABRIOLET phone

malfunction has been rectified, the tire pressure
warning lamp goes out after a few minutes of
driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at a gas station with a pressure gauge. The
tire pressures shown by the on-board computer
refer to those measured at sea level. At high
altitudes, the tire pressure values indicated by a pressure gauge are higher than those shown by
the on-board computer. In this case, do not
reduce the tire pressures.
The operation of the tire pressure monitor can
be affected by interference from radio transmit-
ting equipment (e.g. radio headphones, two-way
radios) that may be being operated in or near the
vehicle.
Checking the tire pressure electroni-
cally
XMake sure that the SmartKey is in position 2
(Ypage 123) in the ignition lock.
XPress òon the steering wheel to call up
the menu list.
XPress 9or: on the steering wheel to
select the Servicemenu.
XConfirm by pressing aon the steering
wheel.
XPress 9or: to select Tire Pres‐sure.
XPressato confirm.
The multifunction display shows the current
tire pressure of each wheel.
If the vehicle was parked for longer than
20 minutes, the following message appears:
Tire
pressurewillbedisplayedafterdriving a few minutes.
After a teach-in process, the tire pressure mon-
itor automatically detects new wheels or new
sensors. As long as a clear allocation of the tire
pressure value to the individual wheels is not
possible, the Tire
PressureMonitorActivemessage is shown instead of the tire pressure
display. The tire pressures are already being
monitored.
Tire pressure monitor warning mes-
sages
If the tire pressure monitor detects a pressure
loss in one or more tires, a warning message is
shown in the multifunction display. The yellow
tire pressure warning lamp then lights up.
RIf thePlease Correct Tire Pressuremessage appears in the multifunction display,
the tire pressure in at least one tire is too low.
The tire pressure must be corrected when the
opportunity arises.
RIf theCheck Tiresmessage appears in the
multifunction display, the tire pressure in one
or more tires has dropped significantly. The
tires must be checked.
RIf the WarningTireMalfunctionmessage
appears in the multifunction display, the tire
pressure in one or more tires has dropped
suddenly. The tires must be checked.
Be sure to observe the instructions and safety
notes in the display messages in the "Tires" sec- tion (
Ypage 234).
If the wheel positions on the vehicle are rotated,
the tire pressures may be displayed for the
wrong positions for a short time. This is rectified after a few minutes of driving, and the tire pres-
sures are displayed for the correct positions.
Restarting the tire pressure monitor
When you restart the tire pressure monitor, all
existing warning messages are deleted and the
warning lamps go out. The monitor uses the cur- rently set tire pressures as the reference values
for monitoring. In most cases, the tire pressure
monitor will automatically detect the new refer-
ence values after you have changed the tire
pressure. However, you can also set reference
values manually as described here. The tire
pressure monitor then monitors the new tire
pressure values.
XSet the tire pressure to the value recommen-
ded for the corresponding driving situation on
the Tire and Loading Information placard on
the B-pillar on the driver's side.
You can find more tire pressures for various
operating conditions in the tire pressure table
inside the filler flap.
Observe the information on tire pressure
when doing so (
Ypage 315).
XMake sure that the tire pressure is correct on
all four wheels.
Tire pressure321
Wheels and tires
Z

Tire-mounting tools should not be used near
the valve. This could damage the electronic
components.
Only have tires changed at a qualified spe-
cialist workshop.
Always observe the instructions and safety
notes in the "Mounting a wheel" section
(
Ypage 332).
The wear patterns on the front and rear tires
differ, depending on the operating conditions.
Rotate the wheels before a clear wear pattern
has formed on the tires. Front tires typically
wear more on the shoulders and the rear tires in the center.
On vehicles that have the same size front and
rear wheels, you can rotate the wheels accord-
ing to the intervals in the tire manufacturer's
warranty book in your vehicle documents. If no
warranty book is available, the tires should be
rotated every 3,000 to 6,000 miles (5,000 to
10,000 km). Depending on tire wear, this may
be required earlier. Do not change the direction
of wheel rotation.
Clean the contact surfaces of the wheel and the
brake disc thoroughly every time a wheel is rota-
ted. Check the tire pressure and, if necessary,
restart the tire pressure loss warning system
(
Ypage 319) or the tire pressure monitor
(Ypage 321).
Direction of rotation
Tires with a specified direction of rotation have
additional benefits, e.g. if there is a risk of hydro- planing. These advantages can only be gained if
the tires are installed corresponding to the
direction of rotation.
An arrow on the sidewall of the tire indicates its
correct direction of rotation.
Storing wheels
Store wheels that are not being used in a cool,
dry and preferably dark place. Protect the tires
from oil, grease, gasoline and diesel.
Mounting a wheel
Preparing the vehicle
XStop the vehicle on solid, non-slippery and
level ground.
XApply the electric parking brake manually.
XBring the front wheels into the straight-ahead position.
XShift the transmission to position j.
XMake sure that the vehicle level is set to "Nor-
mal" on vehicles with AIRMATIC (Ypage 164).
XSwitch off the engine.
XVehicles without KEYLESS-GO:remove the
SmartKey from the ignition lock.
XVehicles with KEYLESS-GO start-function
or KEYLESS-GO: open the driver's door.
The vehicle electronics are now in key posi-
tion u. This is the same as the key having
been removed.
XVehicles with KEYLESS-GO start-function
or KEYLESS-GO: remove the Start/Stop but-
ton from the ignition lock (
Ypage 124).
XMake sure that the engine cannot be started
via your smartphone (Ypage 126).
XIf included in the vehicle equipment, remove
the tire-change tool kit from the vehicle.
XSafeguard the vehicle against rolling away.
Securing the vehicle to prevent it from
rolling away
If your vehicle is equipped with a wheel chock, it
can be found in the tire-change tool kit
(
Ypage 296).
The folding wheel chock is an additional safety
measure to prevent the vehicle from rolling
away, for example when changing a wheel.
332Changing a wheel
Wheels and tires

Information regarding technical data
i
The dat astate dher especifically refers to a
vehicl ewit hstandard equipment. Consult an
authorize dMercedes-Ben zCente rfor th e
dat afor all vehicl evariants and trim levels.
Vehicle electronics
Installing two-way radios and mobile
phones
GWARNIN G
The electromagneti cradiation from two-way
radios can interfere wit hth evehicl eelectron -
ics if two-way radios are manipulated or ret -
rofitte dincorrectly. This could jeopardiz eth e
operating safet yof th evehicle. Ther eis aris k
of an accident.
You should hav eall wor kon electrical and
electronic component scarried out at aquali-
fie dspecialist workshop.
GWARNIN G
If you incorrectl yoperate two-way radios in
th evehicle, th eelectromagneti cradiation
may interfere wit hth evehicl eelectronics ,for
exampl eif:
Rth etwo-way radi ois no tconnecte dto an
exterio rantenna
Rth eexterio rantenna is no tcorrectl ymoun -
te dor is no tlow-reflection
This could jeopardiz eth eoperating safet yof
th evehicle. Ther eis aris kof an accident.
Hav eth elow-reflection exterio rantenna
installed at aqualified specialist workshop.
Always connec ttwo-way radios to th elow-
reflection exterio rantenna when operating in
th evehicle.
!The operating permit may be invalidated if
th einstruction sfor installation and use of
two-way radios are no tobserved. In particular, th
efollowin gcondition smust be
complied with:
Ronly approve dwavebands may be used.
Robserv eth emaximum permissible output
in these wavebands.
Ronly approve dantenna position smay be
used.
Excessiv elevels of electromagneti cradiation
may caus edamag eto your healt hand th ehealt h
of others. Using an exterio rantenna takes int o
accoun tcurren tscientific discussion srelating
to th epossible healt hhazards that may result
from electromagneti cfields.
Approved antenna position s
:Rear fender
On th erear fenders, it is recommended to posi-
tion th eantenna on th eside of th evehicl eclos-
est to th ecenter of th eroad .
Use Technical Specification ISO/TS 2160 9
(Road Vehicles –"EM Cguidelines for installa-
tion of aftermarket radi ofrequency transmitting
equipment") when retrofitting two-way radios.
Observ eth elegal requirements for accessory
parts.
If your vehicl ehas installation sfor two-way radi o
equipment, use th epower suppl yor antenna
connection sintended for use wit hth ebasic wir-
ing .Be sur eto observ eth emanufacturer' sSup -
plemen twhen installing.
Deviation swit hrespec tto frequency bands,
maximum transmission output sor antenna
position smust be approve dby Mercedes-Benz.
338Vehicle electronics
Technical data

The maximum transmission output (PEAK) at the
base of the antenna must not exceed the fol-
lowing values:
Frequency bandMaximum
transmission output
Short wave
3 - 54 MHz30 W
4 m waveband
74 - 88 MHz15 W
2 m waveband
144 - 174 MHz25 W
Trunked radio system/
Tetra
380 - 460 MHz10 W
70 cm waveband
400 - 460 MHz15 W
Mobile communications
(2G/3G/4G)10 W
The following can be used in the vehicle without
restrictions:
RTwo-way radios with a maximum transmission
output of up to 100 mW
RTwo-way radios with transmitter frequencies
in the 380 - 410 MHz waveband and a maxi-
mum transmission output of up to 2 W
(trunked radio/Tetra)
RMobile phones (2G/3G/4G)
There is no restriction for antenna positions on
the outside of the vehicle for the following fre-
quency bands:
RTrunked radio system/Tetra
R70 cm waveband
R2G/3G/4G
Identification plates
Vehicle identification plate with vehi-
cle identification number (VIN)
XOpen the driver's door.
You will see vehicle identification plate :.
Example: vehicle identification plate (USA
only)
:VIN
;Vehicle model
Example: vehicle identification plate (Can-
ada only)
:VIN
;Paint code
Identification plates339
Technical data
Z