MERCEDES-BENZ E-CLASS CABRIOLET 2018 Owner's Manual

ingstatus (→page 355). Observ eth e no tes
on tire temp erature (→page 354).
00CE The values displa yed in the multifunction dis‐
play may deviate from those of the tire pres‐
sure gauge as they referto sea le vel.At high
altitudes, the tire pressure values indicated
by pressure gauges are higher than those
shown bythe on-board computer. In this
case, do not reduce the tire pressure.
Make sure toobser vethefo llowing fur ther rela‐
te d subjec t:
RNotes on tire pressure (→page 354)
Rest arting the tire pressure moni toring sys‐
te m
Requ irement:
RTherecommended tire pressure is cor rectly
set forth ere spective operating condition on
each of thefo ur wheels (
→page 354).
Re start the tire pressure monitoring sy stem in
th efo llowing situations:
RThe tire pressure has changed.
RThe wheels or tires ha vebeen changed or
newly ins talled.
On-board computer:
00866HUYLFH00CF7LUHV
00BBSwipe down wards on theTo uch Control on
th e left-hand side of thesteering wheel.
The 8VH &XUUHQW 3UHVVXUHV DV 1HZ 5HIHU
HQFH 9DOXHV message is shown in the multi‐
function displa y.
00BBPress0076toconfirm there start.
The 7LUH 3UHVV 0RQLWRU 5HVWDUWHG message is
shown in the multifunction displa y.
Cur rent wa rning messages are dele ted and
th e0077 yellow warning lamp goes out.
Af teryo u ha vedriven for a few minutes, the
sy stem checks whe ther the cur rent tire pres‐
sure s are within the specified range. The cur‐
re nt tire pressures are then accep ted as ref‐
erence values and monitored.
Make sure toobser vethefo llowing fur ther rela‐
te d subjec t:
RNotes on tire pressure (→page 354) Ra
dio-equipment appr oval of the tire pres‐
sure moni toring sy stem
Ra dio equipment appr oval numbers
Countr yRadio equipment appr oval
number
Canada
USA FCC ID: MRX
AG5SP4
FCC ID: MRXMFR
IC: 2546A -AG5SP4
Fu rther information on the declaration of con‐
fo rm ity for wireless vehicle components
(
→page 23).
Ti re pressure loss warning sy stem
Fu nction of the tire pressure loss warning
sy stem
The tire pressure loss warning sy stem warnsth e
driver bymeans of display message s whenthere
is a se vere tire pressure loss.
Af ter a change in tire pressure, a wheel rotation
or a wheel change, the tire pressure loss warn‐
Wheels and tires 359

ing system has tobe taught-in again bybeing
re star ted (→page 360).
The tire pressure loss warning sy stem does not
re place the need toregularly check the tire pres‐
sures.
Sy stem limitations
The sy stem may be impaired or may not function
in thefo llowing situations:
RIf th e tire pressure is set incor rectly.
RIfth ere is a sudden pressure loss caused, for
ex ample, byafo re ign object penetrating the
tire.
RIf th e pressure loss in se veral tires decreases
at the same rate.
The sy stem has a limited or dela yed function:
RWhen thero ad sur face is poo r,e.g. snow or
gr ave l.
RWhen driving with snow chains.
RWhen driving in a very sporty driving style
with high cornering speeds or sudden accel‐
eration.
RWhen driving with a high load. Be sure
toalso observ eth efo llowing fur ther
re lated subjects:
RNo tes on tire pressure (→page 354)
RDisplay messages about the tires
(→page 425)
Re starting the tire pressure loss warning
sy stem
Re quirement:
RThe recommended tire pressure is cor rectly
set forth ere spective operating condition on
each of thefo ur wheels (
→page 354).
On-board co mputer:
00866HUYLFH00CF7LUHV
The 5XQ )ODW ,QGLFDWRU $FWLYH3UHVV
2.
WR
5HVWDUW message is sho w
nin the multifunction
displa y.
Re start the tire pressure loss warning sy stem in
th efo llowing situations:
RThe tire pressure has changed.
RThe wheels or tires ha vebeen changed or
newly ins talled.
00BBPress 0076tobegin the new start.
The 7LUH 3UHVVXUH 1RZ 2." message is
shown in the multifunction displa y.
00BBSelect<HV.
00BBPress0076toconfirm there start.
The 5XQ )ODW ,QGLFDWRU 5HVWDUWHG message is
shown in the multifunction displa y.
Af teryo u ha vedriven for a few minutes, the
tire pressure losswarning sy stem monitors
th e set tire pressures of all the tires.
Be sure toalso observ eth efo llowing fur ther
re lated subjects:
RNo tes on tire pressure (→page 354)
Loading theve hicle
Tire and Loading Information placard
0071
WARNING Risk of accident from overloa‐
ded tires
Overloaded tires may overheat and bur stas a
consequence. Overloaded tires can also
360 Wheels and tires

impairthesteering and handling characteris‐
tics and lead tobrake failure.
00BBObser vethe load rating of the tires.
00BBThe load rating must be at least half the
permissible axle load of theve hicle.
00BBNe verove rload the tires by exceeding
th e maximum load.
The Tire and Loading Info rmation placard is on
th e B-pillar on the driver's side of theve hicle.
1Tire and Loading Info rmation placard
00CE
The data shown in the image is example
data.
The Tire and Loading Info rmation placard sho ws:
RMaximum number of seats 2according to
th e maximum number of people permitted to
tr ave l in theve hicle.
RMaximum permissible load 3comprises the
gros swe ight of all vehicle occupants, load
and luggage.
RRe commended tire pressures 1for cold
tires. The recommended tire pressures are
va lid forth e maximum permissible load and
up tothe maximum permissible vehicle
speed.
Please also no te:
RInformation on permissible weights and loads
on theve hicle identification plate
(
→page 385).
RInformation on tire pressure on the tire pres‐
sure table (→page 355).
Fu rther related subjects:
RDe term ining the maximum permissible load
(→page 361)
RNo tes on tire pressure (→page 354)
De term ining the maximum permissible load
The following steps ha vebeen de veloped as
re qu ired of all manufacturers under Title 49,
Code of U.S. Federal Regulations, Part57 5, pur‐
suant tothe "National Traf fic and Mo torVe hicle
Saf etyAc t of 1966".
Wheels and tires 361

00BBStep 1: locatethest atement "The combined
we ight of occupants and cargo should ne ver
exc eed XXX kgor XXX lbs." ("The combined
we ight of occupants and cargo should ne ver
exc eed XXX kgor XXX lbs.") on your vehicle's
Ti re and Loading Info rmation placard.
00BBSte p 2: determ ine the combined weight of
th e driver and passengers that will be tra vel‐
ing in your vehicle.
00BBSte p 3: subtract the combined weight of the
driver and passengers from XXX kgor
XXX lbs.
00BBSte p 4: there sulting figure equals the per‐
missible cargo and luggage load capacity. For
ex ample: If "XXX" equals 1400 lbs and there
are five occupants in your vehicle with a
we ight of 150 lbs each, the maximum cargo
and luggage load capacity is 650 lbs (1400 -
75 0 (5 x 150) = 650 lbs).
00BBSte p 5: determ ine the combined weight of
luggage and cargo that theve hicle will be
car rying. For saf etyre asons, this we ight may
not safely exceed theav ailable cargo and lug‐
ga ge load capacity calculated in step 4. Even if
you ha vecalculated thetot al load care‐
full y,yo u should still make sure that the maxi‐
mum permissible gross mass and the maximum
permissible axle load of your vehicle are not
exc eeded. De tails can be found on theve hicle
identification plate.
00BBHa ve your loaded vehicle – including driver,
occupants and load – weighed on a vehicle
we ighbridge.
The measured values may not exceed the
maximum permissible values stated on the
ve hicle identification plate.
Fu rther related subjects:
RCalculation example for de term ining the max‐
imum load (→page 362)
RTi re and Loading Info rmation placard
(→page 360)
RTi re pressure table (→page 355)
RVe hicle identification plate
Calculation example for de term ining the
ma ximum load
The following table sho wsexamples of how to
calculate tota l and load capacities with varying
seating con figurations and dif fere nt numbe rs
and sizes of occupants. The following examples
use a maximum load of 1500 lbs (680 kg).This
is for illustration purposes on ly.Make sure
yo u are using the actual load limit foryo ur vehi‐
cle stated on your vehicle's Tire and Loading
Info rmation placard (
→page 360).
The higher thewe ight of all the occupants, the
smaller the maximum load for lug gage .
362
Wheels and tires

Step 1
Example 1E xamp le 2
Combined maximum weight of occupants and
load (data from theTire and Loading Info rmation
placard) 15
00 lbs (680 kg)1 500 lbs (680kg)
Ste p 2
Example 1E xamp le 2
Numb er of people in theve hicle (driver and
occupants) 51
Distribution of the occupant sF ront: 2
Re ar: 3 Fr
ont: 1
We ight of occupant sO ccupant 1:150 lbs (68 kg)
Occupant 2: 180 lbs (82 kg)
Occupant 3: 160 lbs (73 kg)
Occupant 4: 140 lbs (63 kg)
Occupant 5: 120 lbs (54 kg) Occupant 1: 200 lbs (91
kg)
To talwe ight of all occupant s7 50 lbs (340kg)2 00 lbs (91kg)
Wheels and tires 363

Step 3
Example 1E xamp le 2
Pe rm issible load (maximum grossve hicle weight
ra ting from theTire and Loading Info rmation
placard minus the gross weight of all occupants) 15
00 lbs (680 kg)00F8 75 0 lbs (340 kg) = 750 lbs
(340 kg) 15
00 lbs (680 kg)00F8 200 lbs (91 kg) = 1300 lbs
(589 kg)
364
Wheels and tires

Tire labeling
Overview of tire labeling
1Uni form Ti reQuality Grading Standard
(→page 365)
2DO T,Tire Identification Number
(→page 366)
3Maximum tire load (→page 367)
4Maximum tire pressure (→page 367)
5Manufacturer
6Characteristics ofthe tire (→page 368)
7Tire size designation, load-beari ng capacity,
speed rating and load ind ex(→page 368)
8Tire name
00CE The da tashown in the image is example
data.
Ti re Quality Grading
In accordance with the US Department of Trans‐
por tation's "Unifo rm TireQuality Grading Stand‐
ards", tire manufacturers are requ ired tograde
th eir tires on the basis of thefo llowing thre e per‐
fo rm ance factors:1Tread weargrade
2Traction grade
3Te mp erature grade
00CE The data shown in the image is example
data.
00CE The classification is not legally stipulated for
Canada, but it is general lystated.
Tr ead weargrade
The tread wear grade is a comparative rating
based on thewe arrate ofthe tire when tested
under controlled conditions on a specified test
track of the US Department of Transpor tation.
Fo rex ample, a tire graded 150wo uld wear one
Wheels and tires 365

and one-half times aswell on the go vernment
te st track as a tire graded 100.
The relative per form ance of tires depends upon
th e actual conditions of their use, ho wever,and
may depart significantly from the norm due to
va riations in driving habits, service practices and
dif fere nces in road characteristics and climate
conditions.
Tr action grade
0071
DANG ER Risk of accident due toinade‐
qu ate traction
The traction grade assigned tothis tire is
based on stra ight-ahead braking traction
te sts, and does not include either accelera‐
tion, cornering, hydroplaning or peak traction
ch aracteristics.
00BBAlw ays adapt your drivin gst yle and
drive at a speed tosuit the pr evailing
traf fic and weather conditions.
0075 NO
TEDama getothe driv etra in from
wheelspin
00BBAv oid wheelspin.
The traction grades – from highest tolowest –
are AA, A,B and C. Those grades represent the
tire's ability tostop on wet pa vement as meas‐
ured under controlled conditions on specified
go vernment test sur faces made of asphalt and
concr ete.
Te mp erature grade
0071
WARNING Risk of accident from tire
ove rheating and tire failure
The temp erature grade forth is tire is es tab‐
lished for a tire that is proper ly inflated and
not overloaded. Excessive speed, underinfla‐
tion, or excessive loading, either separately
or in combination, can cause excessive heat
build-up and possible tire failure.
00BBObser vethere commended tire pres‐
sure s and regularly check the tire pres‐
sure of all tires including the spare
wheel.
00BBAd just the tire pressure as necessar y.
Thetemp erature grades are A (the highest), B
and C. They represent the tire's resis tance tothe
ge neration of heat and its ability todissipate
heat when tested under controlled conditions on
a specified indoor laboratory test wheel. Sus‐
ta ined high temp erature can cause the material
of the tire todegenerate and reduce tire life, and
exc essive temp erature can lead tosudden tire
fa ilure. Grade C cor responds toa le vel of per‐
fo rm ance which all passenger car tires must
meet under therequ irements of the US Depart‐
ment of Transpor tation.
DO T,Tire Identification Number (TIN)
US tire regulations stipulate that eve rytire man‐
ufactu rer or retreader must imprint a TIN in or
on the side wall of each tire produced.
366
Wheels and tires

00CEThe data shown in the image is example
data.
The TIN is a unique identification number to
identify tires and comprises thefo llowing:
RDOT (Department of Transport ation):tire
symbol mar ks1 indicating that the tire
complies with therequ irements of the US
Department of Transpor tation.
RManufacturer identi fication code: manu‐
fa cturer identification code 2contains
de tails of the tire manufacturer. New tires
ha ve a code with two symbols. Retreaded
tires ha vea code with four symbols. Further
information on retreaded tires (
→pa ge 373).
RTire size: identifier 3describes the tire
size.
RTi re type code: tire type code 4can be
used bythe manufacturer as a code to
describe specific characteristics of the tire.
RManufacturing date: manufacturing date
5 prov ides information about the age of a
tire. The 1st and 2nd positions represent the
calendar week and the 3rd and 4th positions
st ate theye ar of manufacture (e.g. "3208"
re presents the 32nd week of 2008).
Information on the maximum tire load
00CE
The data shown in the image is example
data.
Maximum tire load 1isthe maximum permissi‐
ble weight for which the tire is appr oved.
Do not overload the tires by exceeding the speci‐
fi ed load limit. The maximum permissible load
can be found on theve hicle's Tire and Loading
Info rmation placard on the B-pillar on the driv‐
er's side (
→page 360).
Specifications for maximum tire pressure
00CE
The da tashown in the image is example
data.
Wheels and tires 367

Neverexc eed maximum tire pressure 1speci‐
fi ed forth e tire.
Information on tire characteristics
00CE
The data shown in the image is example
data.
This information descri besthe type of tire cord
and the number of la yers in side wall1 and
under tire tread 2.
Tire size designation, load-bearing capacity,
speed rating and load index
0071
WARNING Risk of injury thro ugh exceed‐
ing the specified tire load rating or the
permissible speed rating
Exceeding the specified tire load rating or
th e permissible speed rating may lead totire
damage andtothe tires bur sting.
00BBTherefore, only use tire types and sizes
appr ovedfo ryo ur vehicle model.
00BBObser vethe tire load rating and speed
ra ting requ ired foryo ur vehicle.
1Preceding letter
2Nominal tire width in millime ters
3Aspect ratio in %
4Tire code
5Rim diame ter
6Load-bearing index
7Speed rating
8Load ind ex
00CE The data shown in the image is example
data.
Info rmation about reading tire data can be
obtained from any qualified specialist workshop.
368
Wheels and tires