2017 MERCEDES-BENZ C-Class COUPE tire pressure

same time cannot be detected by the tire pres-
sure loss warning system.
The tire pressure monitor is not able to warn you
ofas udden loss of pressure, e.g. if the tire is
penetrated by aforeign object. In the event of a
sudden loss of pressure, bring the vehicle to a
halt by braking carefully .Avoid abrupt steering
movements.
The function of the tire pressure loss warning
system is limited or delayed if:
Rsnow chains are mounted on your vehicle's
tires.
Rroad conditions are wintry.
Ryou are driving on sand or gravel.
Ryou adopt avery sporty driving style (corner-
ing at high speeds or driving with high rates of acceleration).
Ryou are driving with aheavy load (in the vehi-
cle or on the roof).
R
Restarting the tire pressure loss warn-
ing system
Restart the tire pressure loss warning system if you have:
Rchanged the tire pressure
Rchanged the wheels or tires
Rmounted new wheels or tires
XBefore restarting, make sure that the tire
pressures are set properly on all four tires for
the respective operating conditions.
The recommended tire pressure can be found
on the Tire and Loading Information placard
on the B-pillar. Additionally, atire pressure
table is attached to the fuel filler flap. The tire
pressure loss warning system can only give
reliable warnings if you have set the correct
tire pressure. If an incorrect tire pressure is
set, these incorrect values will be monitored.
XAlso observe the notes in the section on tire
pressures (Ypage 319).
XMake sure that the SmartKey is in position 2
in the ignition lock (Ypage 131).
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 Run Flat Indicator ActivePress'OK' to Restartmessage is shown in the
multifunction display.
If you wish to confirm the restart:
XPress the abutton.
The Tire Pressure Now OK?message is
shown in the multifunction display.
XSelect Yeswith9 or:.
XPress ato confirm.
The Run Flat Indicator Restartedmes-
sage is shown in the multifunction display.
After ateach-in period, the tire pressure loss
warning system will monitor the set tire pres-
sures of all four tires.
If you wish to cancel the restart:
XPress the %button.
or
XIf the Tire Pressure Now OK?message
appears, press 9or: to select Can‐
cel.
XPressato confirm.
The tire pressure values stored at the last
restart will continue to be monitored.
Tire pressure monitor
General notes
If at ire pressure monitor is installed, the vehi-
cle's wheels have sensors that monitor the tire
pressures in all four tires. The tire pressure mon-
itor warns you if the pressure drops in one or
more of the tires. The tire pressure monitor only
functions if the corresponding sensors are
installed in all wheels.
Information on tire pressures is displayed in the
multifunction display. After afew minutes of
driving, the current tire pressure of each tire is
shown in the Service
menu of the multifunction
display; see illustration (example).
Tire pressure323
Wheels and tires
Z

Information on the message display can be
found in the "Checking the tire pressure elec-
tronically"section (
Ypage 325).
Important safety notes
GWARNING
Each tire, including the spare (if provided),
shoul dbec hecked at least once every two
weeks when cold and inflated to the pressure recommended by the vehicle manufacturer
on the Tire and Loading Information placard
on the driver's door B-pillaro rthe tire pres-
sure label on the inside of the fuel fillerf lap. If
you rvehicle has tires of adifferent size than
the size indicated on the Tire and Loading
Information placard or, if available, the tire
pressure label, you shoul ddetermine the
proper tire pressure for those tires.
As an adde dsafety feature, you rvehicle has
been equipped with atire pressure monitoring
system (TPMS) that illuminates alow tire pres-
sure telltal ewhen one or more of you rtires
are significantly underinflated. Accordingly,
when the low tire pressure telltal elights up,
you shoul dstop and check you rtires as soon
as possible, and inflate them to the proper
pressure. Driving on asignificantly underin-
flated tire cause sthe tire to overheata nd can
leadtot ire failure.
Underinflation also reduces fuel efficiency
and tire tread life, and may affect the vehicle's
handling and stopping ability. Please note that the TPMS is not asubstitute for proper tire
maintenance, and it is the driver's responsi-
bility to maintain correct tire pressure, even if
underinflation has not reached the level to
trigger illuminatio nofthe TPMS low tire pres-
sure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when
the system is not operating properly. The
TPMS malfunction indicator is combined with
the low tire pressure telltale. When the sys-
tem detects amalfunction, the warning lamp
wil lflash for approximately aminute and then
remain continuously illuminated .This
sequence wil lberepeated every time the vehi-
cle is started as long as the malfunction
exists. When the malfunction indicator is illu-
minated, the system may not be abl etodetect
or signal low tire pressure as intended.
TPMS malfunctions may occur for avariety of
reasons, including the installation of incom-
patibl ereplacement or alternate tires or
wheel sonthe vehicle that prevent the TPMS
from functioning properly. Alway scheck the
TPMS malfunction telltal eafter replacing one
or more tires or wheel sonyourv ehicle to
ensure that the replacement or alternate Tires
and wheelsa llow the TPMS to continue to
function properly.
It is the driver's responsibility to set the tire
pressure to that recommended for cold tires
which is suitable for the operating situation
(
Ypage 319). Note that the correct tire pressure
for the current operating situation must first be
taught-in to the tire pressure monitor. If there is
as ubstantial loss of pressure, the warning
threshold for the warning messag eisaligned to
the reference values taught-in. Restart the tire
pressure monitor after adjusting the pressure of
the cold tires (
Ypage 325). The current pres-
sures are saved as new reference values. As a
result, awarning messag ewillappear if the tire
pressure drops significantly.
The tire pressure monitor does not warn you of
an incorrectly set tire pressure. Observe the
notes on the recommended tire pressure
(
Ypage 319).
The tire pressure monitor is not abl etowarn you
of as udden loss of pressure, e.g. if the tire is
penetrated by aforeign object. In the event of a
su

dden loss of pressure, bring the vehicle to a
halt by braking carefully. Avoid abrupt steering
movements.
324Tire pressure
Wheelsa nd tires

The tire pressure monitor hasayellow warning
lamp in the instrument cluster for indicating
pressure loss or amalfunction. Whether the
warning lamp flashes or lights up indicates
whether atire pressure is too low or the tire
pressure monitor is malfunctioning:
Rif the warning lamp is lit continuously, the tire
pressure on one or more tires is significantly
too low. The tire pressure monitor is not mal- functioning.
Rif the warning lamp flashes for around a
minute and then remains lit constantly, the
tire pressure monitor is malfunctioning.
In addition to the warning lamp, amessage
appears in the multifunction display.O bserve
the information on display messages
(
Ypage 241).
It may take up to ten minutes for amalfunction
of the tire pressure monitor to be indicated. A
malfunction will be indicated by the tire pres-
sure warning lamp flashing for approximately
one minute and then remaining lit. When the
malfunction has been rectified, the tire pressure
warning lamp goes out after afew minutes of
driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at agas station with apressure 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 interferenc efrom radio transmit-
ting equipment (e.g. radio headphones, two-way
radios) that may be being operated in or near the vehicle.
Checking the tire pressur eelectroni-
cally
XMake sure that the SmartKey is in position 2
in the ignition lock (Ypage 131).
XPress òon the steerin gwheel to call up
the menu list.
XPress 9or: on the steerin gwheel 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 afew minutes.
After ateach-in process, the tire pressure mon-
itor automatically detect snew wheels or new
sensors. As long as aclear 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 pressur emonitor warning mes-
sages
If the tire pressure monitor detect sapressure
loss in one or more tires, awarning message is
shown in the multifunction display.T he yellow
tire pressure warning lamp then lights up.
RIf the Please 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 opportunit yarises.
RIf the Check Tiresmessage appears in the
multifunction display,t he tire pressure in one
or more tires has dropped significantly. The
tires must be checked.
RIf the WarningTireMalfunctionmessage
appears in the multifunction display,t he 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 241).
If the wheel positions on the vehicle are rotated, the tire pressures may be displayed for the
wrong positions for ashort time. This is rectified
after afew minutes of driving, and the tire pres-
sures are displayed for the correctp ositions.
Restarting the tire pressuremonitor
When you restart the tire pressure monitor, all
existin gwarning messages are deleted and the
warning lamps go out. The monitor uses the cur-
rently set tire pressures as the reference values
Tirep ressure325
Wheels and tires
Z

for monitoring. In most cases,the tire pressure
monitor wil lautomatically detect the new refer-
ence values after you have changed the tire
pressure. However, you can als odefine refer-
ence values manually as described here. The tire
pressure monitor then monitors the new tire
pressure values.
XSet the tire pressure to the valu erecommen-
ded for the corresponding driving situation on
the Tire and Loading Informatio nplacard on
the driver's side B-pillar (
Ypag e319).
You can find more tire pressure values for
various operating conditions in the tire pres-
sure tabl einsidet he fuel filler flap
(
Ypag e319).
XMake sure that the tire pressure is correct on
all four wheels.
XMake sure that the SmartKey is in position 2
in the ignition lock (Ypag e131).
XPress òon the steering whee ltocall up
the menu list.
XPress 9or: on the steering whee lto
select the Servicemenu.
XConfirm by pressing aon the steering
wheel.
XPress 9or: to select Tire Pres‐sure.
XPressato confirm.
The multifunction display showst he current
tire pressure of each whee lortheTire
pressurew ill be displayed afterdrivingafew minutesmessage.
XPress the :button.
The UseCurrentPressuresasNewRef‐erence Valuesmessage is shownint he
multifunction display.
If you wis htoconfirm the restart:
XPress the abutton.
The TirePress.MonitorRestartedmes-
sage is shownint he multifunction display.
After driving for afew minutes ,the system
checks whethe rthe current tire pressures are
withi nthe specified range. The new tire pres-
sure sare then accepted as reference values
and monitored.
If you wis htocancel the restart:
XPress the %button.
The tire pressure values stored at the last
restart wil lcontinue to be monitored.
Loading the vehicle
Instruction labels for tires and loads
GWARNING
Overloade dtires can overheat, causing a
blowout. Overloade dtires can als oimpair the
steering and driving characteristics and lead
to brake failure. There is arisk of accident.
Observet he loadrating of the tires. The load
rating must be at least hal fofthe GAWR of
you rvehicle. Never overload the tires by
exceeding the maximu mload.
Two instruction labels on you rvehicles how the
maximu mpossible load.
(1) The Tire and Loading Informatio nplacard is
on the B-pillar on the driver's side .The Tire
and Loading Informatio nplacard showst he
maximu mpermissible numbe rofoccu-
pants and the maximu mpermissible vehicle
load. It als ocontains details of the tire sizes
and corresponding pressures for tires
mounted at the factory.
(2) The vehicl eidentificatio nplate is on the B-
pillar on the driver's side .The vehicl eiden-
tification plate informs you of the gross
vehicl eweight rating. It is made up of the
vehicl eweight, all vehicl eoccupants, the
fuel and the cargo. You can als ofind infor-
mation about the maximu mgross axle
weight rating on the front and rear axle.
The maximu mgross axle weight rating is
the maximu mweight that can be carrie dby
one axle (front or rear axle). Never exceed
the maximu mloadort he maximu mgross
axle weight rating for the front or rear axle.
:B-pillar, driver's side
326Loading the vehicle
Wheels and tires

The safe speed onawet, snow covered or icy
road is alwaysl ower than on dry road surfaces.
You should pay special attention to road condi-
tions when temperatures are around freezing
point.
Mercedes-Benz recommends aminimum tread
depth of ãin (4 mm) on all four winter tires.
Observe the legally required minimum tire tread
depth (
Ypage 317). Winter tires can reduce the
braking distance on snow-covered surfaces in
comparison with summer tires. The braking dis-
tanc eiss till much further than on surfaces that
are not icy or covered with snow. Take appro-
priate care when driving.
Further information on winter tires (M+S tires)
(
Ypage 318).
Temperature
GWARNING
The temperature grade for this tire is estab-
lished for atire that is properly inflated and
not overloaded. Excessive speed, underinfla-
tion, or excessivel oading, either separately or
in combination, can cause excessiveh eat
build-up and possible tire failure.
The temperature grades are A(the highest), B,
and C, representing the tire's resistanc etothe
generation of heat and its ability to dissipate
heat when tested under controlled conditions
on aspecified indoor laboratory test wheel. Sus-
tained high temperature can cause the material
of the tire to degenerate and reduce tire life, and
excessivet emperature can lead to sudden tire
failure. The grade Ccorresponds to alevel of
performance which all passenger car tires must
meet under the Federal Motor Vehicle Safety
Standard No. 109. Grades BandArepresent
higher levels of performance on the laboratory
test wheel than the minimum required by law.
Tire labeling
Overview
:Uniform Tire Quality Grading Standard
(Ypage 334)
;DOT, Tire Identification Number
(Ypage 333)
=Maximum tire load (Ypage 332)
?Maximum tire pressure (Ypage 322)
AManufacturer
BTire material (Ypage 333)
CTire size designation, load-bearing capacity
and speed rating (Ypage 330)
DLoad index (Ypage 332)
ETire name
The markings described above are on the tire in
addition to the tire name (sales designation) and
the manufacturer's name.
iTire data is vehicle-specific and may deviate
from the data in the example.
Tire size designation, load-bearing
capacity and speed rating
GWARNING
Exceeding the stated tire load-bearing capa-
city and the approved maximum speed could
lead to tire damage or the tire bursting. There is ar isk of accident.
Therefore, only use tire types and sizes
approved for your vehicle model. Observe the
330All about wheelsa nd tires
Wheels and tires

tire load rating and speedrating required for
your vehicle.
:Tire width
;Nomina laspec tratio in %
=Tire code
?Rimd iame ter
ALoadbeari ng index
BSpeed rating
General: depending on the manufacturer's
standards ,the size imprinted in the tire wall may
not contain any letters or mayc ontain one letter
thatp recedes the size description.
If there is no letter preceding the size descrip-
tio n(as shown above): these ar epassenger
vehicl etiresa ccording to Europea nmanufac-
turing standards.
If "P "precedes the size description: these are
passenge rvehicl etiresa ccording to U.S. man-
ufacturin gstandards.
If "LT" precedes the size description: these are
light truck tire saccording to U.S. manufacturing
standards.
If "T "precedes the size description: compact
emergency wheels with high tire pressure that
ar eo nlyd esig nedf or temporary us einanemer-
gency.
Tire width: tire width:shows the nominal tire
width in millimeters.
Height-width ratio: aspect ratio;is the size
ratio between the tire height and tire width and
is shown in percent. The aspect ratio is calcula-
ted by dividing the tire width by the tire height.
Tire code: tire code=specifie sthe tire type.
"R "r epresents radial tires; "D" represents diag-
ona ltires
; "B" represents diagona
lradial tires.
Optionally ,tire sw itham aximum spee dofover
149 mph (24 0km/h )mayhave "ZR" in the size description, depending on the manufacturer
(e.g. 245/40Z
R18).
Rim diameter: rim diameter?is the diameter
of the bead seat, not the diamete rofthe rim
flange .The ri mdiame teriss pecifie din
inches (in).
Load-bearin gind ex: load-bearing index Ais a
numerical cod ethats pecifie sthe maximum
load-bearing capacity of atire.
Do not overload the tire sbyexceeding the
specifie dloa dlimit .The maximu mpermissible
load can be found on the vehicle's Tire and
Loading Informatio nplacard on the B-pillar on
the driver's side (
Ypage 326).
Example:
Load-bearin gindex 91 indicates amaximum
load of 1,356 lb (61 5kg)thatt he tire scan bear.
For furthe rinformation on the maximum tire
load in kilograms and lbs, see(
Ypage 332).
For furthe rinformation on the load bearing
index, see" Loadindex" (
Ypage 332).
Speed rating: speedrating Bspecifie sthe
approved maximum spee dofthe tire.
iTire data is vehicle-specific and mayd eviate
fromt he data in the example.
Regardles softhe spee drating ,alway sobser ve
th

e spee dlimit s. Drive carefull yand adap tyou r
drivin gstyle to the trafficc onditions.
Summe rtires
IndexSpeed rating
Qup to 100 mph (16 0km/h)
Rup to 106 mph (17 0km/h)
Sup to 112 mph (18 0km/h)
Tup to 118 mph (19 0km/h)
Hup to 130 mph (21 0km/h)
Vup to 149 mph (24 0km/h)
Wup to 168 mph (27 0km/h)
Yup to 186 mph (30 0km/h)
ZR...Yup to 186 mph (30 0km/h)
ZR...(..Y)ove r186 mph (300 km/h)
ZRove r149 mph (240 km/h)
ROptionally ,tire sw itham aximum spee dof
ove r149 mph (24 0km/h )mayhave "ZR" in
Alla bout wheels an dtires331
Wheel sand tires
Z

the size description, depending on the man-
ufacturer (e.g. 245/40ZR18).
The service specification is made up of load-
bearing index Aand spee drating B.
RIf the size description of your tire includes
"ZR" and there ar enoservice specifications,
as kt he tire manufacturer in order to fin dout
the maximum speed.
If as ervice specification is available, the max-
imum spee dislimited according to the speed
rating in the service specification. Example:
245/40Z R1897Y.Int his example ,"97 Y" is
the service specification. The letter "Y" rep-
resents the speed rating. The maximum
speed of the tire is limited to 186 mph
(300 km/h).
RThe size descriptionf or all tires with maxi-
mum speedsofo ver 186 mph (300 km/h)
must include "ZR", andthe service specifica-
tion must be given in parentheses .Example:
275/40 ZR 18 (99 Y) .Speed rating "(Y)" indi-
cates that the maximum speed of the tire is
over 186 mph (300 km/h). Ask the tire man-
ufacturer abou tthe maximum speed.
All-weather tires and winter tires
IndexSpeed rating
QM +S1up to 100 mph (160 km/h)
TM+S1up to 118 mph (190 km/h)
HM +S1up to 130 mph (210 km/h)
VM+S1up to 149 mph (240 km/h)
iNot all tires with the M+S marking provide
the driving characteristics of winter tires. In
addition to the M+S marking, winter tires also
have the isnowflake symbo lonthe tire
wall. Tires with this marking fulfill the require-
ments of the Rubber Manufacturers Associa-
tion (RMA) and the Rubber Association of
Canada (RAC) regarding the tire traction on
snow. They have been especially developed
for driving on snow.
An electronic speed limiter prevents you rvehi-
cle from exceeding aspeed of 130 mph
(210 km/h).
The speed rating of tires mounted at the factory
may be higher than the maximum speed that the
electronic speed limiter permits. Make sure that you
rtires have the required
speed rating, e.g. when buying new tires. The
required speed rating for you rvehicle can be
found in the "Tires" section (
Ypage 340).
Further information abou treading tire data can
be obtained from any qualifieds pecialist work-
shop.
Load index
In addition to the load-bearing index, load
index :may also be imprinted on the sidewall
of the tire. You wil lfind this after the letter that
identifiest he speed rating (
Ypage 330).
RIf no specification is given: no text (as in the
example above), represents astandard load
(SL) tire
RXL or ExtraL oad: represents areinforced tire
RLight Load: represents alightl oad tire
RC, D, E: represents aload range that depends
on the maximum load that the tire can carry at
ac ertain pressure
iTire data is vehicle-specific and may deviate
from the data in the example.
Maximum load rating
1Or M+S ifor winter tires.
332Allabout wheels and tires
Wheelsa nd tires

Maximum tire load:is the maximum permis-
sible weight for which the tire is approved.
Do not overload the tires by exceeding the
specified load limit. The maximum permissible
load can be found on the vehicle's Tire and
Loading Information placard on the B-pillar on
the driver's side (
Ypage 326).
iThe actual values for tires are vehicle-spe-
cific and may deviate from the values in the
illustration.
DOT, Tire Identification Number (TIN)
US tire regulations stipulate that every tire man-
ufacturer or retreader must imprint aTIN in or on
the sidewall of each tire produced.
The TIN is aunique identification number. The
TIN enables the tire manufacturers or retreaders
to inform purchasers of recalls and other safety-
relevant matters. It makes it possible for the
purchaser to easily identify the affected tires.
The TIN is made up of manufacturer identifica-
tion code ;,tire size =,tire type code ?and
manufacturing date A.
DOT (Department of Transportation): tire
symbol :marks that the tire complies with the
requirements of the U.S. DepartmentofT rans-
portation.
Manufacturer identification code: manufac-
turer identification code ;provides details on
the tire manufacturer. New tires have acode
with two symbols. Retreaded tires have acode
with four symbols.
For further information about retreaded tires,
see (
Ypage 340).
Tire size: identifier=describes the tire size.
Tire type code: tire type code?can be used by
the manufacturer as acode to describe specific
characteristics of the tire. Date of manufacture:
date of manufactureA
provides information about the age of atire. The
first and second positions represent the week of
manufacture, startin gwith "01" for the first cal-
endar week. Positions three and four represent
the year of manufacture. For example, atire that
is marked with "3208", was manufactured in
week 32 in 2008.
iTire data is vehicle-specific and may deviate
from the data in the example.
Tire characteristics
This information describes the type of tire cord
and the number of layers in sidewall :and
under tire tread ;.
iTire data is vehicle-specific and may deviate
from the data in the example.
Definition of termsf or tires and loading
Tire ply composition and material used
Describes the number of plies or the number of
layers of rubber-coated fabric in the tire tread
and sidewall. These are made of steel, nylon,
polyester and other materials.
Bar
Metric unit for tire pressure. 14.5038 pounds
per square inch (psi) and 100 kilopascals (kPa)
are the equivalent of1bar.
DOT (Department of Transportation)
DOT-marked tires fulfill the requirements of the
USD epartmen tofTransportation.
Normal occupant weight
The number of occupants for which the vehicle
is designed multiplied by 68 kilograms (150 lbs).
All about wheels and tires333
Wheels and tires
Z