MERCEDES-BENZ S CLASS 2023 Owners Manual

=Tire and loading information placard
(  page 451)
Tire pressure monitoring system

qFunction of the tire pressure monitor
&DANGER Risk of accident due to incorrect
tire pressure
Each tire, including the spare (if provided), should be checked monthly when cold and
in"Oated to the in"Oation pressure recommen-
ded by the vehicle manufacturer on the vehi- cle placard or tire in"Oation pressure label. (If
your vehicle has tires of a di"Merent size than
the size indicated on the vehicle placard or
tire in"Oation pressure label, you should deter-
mine the proper tire in"Oation pressure for
those tires.)
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring system (TPMS) that illuminates a low tire pres-
sure telltale when one or more of your tires is
signi"Ncantly under-in"Oated. Accordingly, when
the low tire pressure telltale illuminates, you
should stop and check your tires as soon as
possible, and in"Oate them to the proper pres-
sure. Driving on a signi"Ncantly under-in"Oated
tire causes the tire to overheat and can lead
to tire failure. Under-in"Oation also reduces fuel
e"Pciency and tire tread life, and may a"Mect
the vehicle!

In most cases, the tire pressure monitor will auto-matically update the new reference values a"ser
you have changed the tire pressure. You can, however, also update the reference values byrestarting the tire pressure monitor manually
(  page 450).
System limits
The system may be impaired or may not function particularly in the following situations:
= Incorrect reference values were taught in
= Sudden pressure loss caused by a foreign
object penetrating the tire, for example
= Malfunction caused by another radio signal
source

q Checking the tire pressure with the tire pres-
sure monitoring system
Requirements
= The vehicle is switched on.
Driver\bs display: 4 © 5
ServicePress v to con"Nrm.One of the following displays appears:
= Current tire pressure of each wheel:
=Tire pressure displayed after driving for a
few minutes. : current values are not yet
known to the system. The pressure/tempera-
ture values of each tire are displayed as soon
as they are known to the system.
= Tire Pressure Monitor Active : the teach-in
process of the system is not yet complete. The
tire pressures are already being monitored.
Compare the current tire pressure with the
recommended tire pressure for the current
operating condition (  page 447). Addition-ally, observe the notes on cold tires
(  page 446).\bThe values displayed in the driver\bs display
may deviate from those of the tire pressure
gauge as they refer to sea level. At high eleva-
tions, the tire pressure value indicated by a
tire pressure gauge is higher than that shown
in the driver\bs display.
Bear in mind the following related topic:
= Notes on tire pressure (  page 446)

q Restarting the tire pressure monitoring system
Requirements
= The recommended tire pressure is correctly
set for the respective operating status on each
of the four wheels (  page 446).
Restart the tire pressure monitoring system in the following situations:
= The tire pressure has changed.
= The wheels or tires have been changed or
newly "Ntted.
450Wheels and tires

Driver\bs display:4 © 5
ServiceSelect Tire Pressure and con"Nrm with v.Swipe downwards on Touch Control on the
steering wheel.
The Use current pressures as new reference
values" message is shown in the driver\bs dis-
play.Select Yes and con"Nrm the restart with v.
The Tire Pressure Monitor Restarted message
is shown in the driver\bs display.
Current warning messages are deleted and
the yellow w warning lamp goes out.
A"ser you have been driving for a few minutes,
the system checks whether the current tire
pressures are within the speci"Ned range. The
current tire pressures are then accepted as reference values and monitored.
If the tire pressure levels are not within the
speci"Ned range, the Please Correct Tire Pres-
sure message appears.
Bear in mind the following related topic:
= Notes on tire pressure (  page 446)
Loading the vehicle
Notes on Tire and Loading Information placard
&WARNING Risk of accident from overloa-
ded tires
Overloaded tires may overheat and burst as a
consequence. Overloaded tires can also
impair the steering and handling characteris-
tics and lead to brake failure.
Observe the load rating of the tires.The load rating must be at least half the
permissible axle load of the vehicle.Never overload the tires by exceeding
the maximum load.
The Tire and Loading Information placard is on the
B-pillar on the driver\bs side of the vehicle.
1Tire and Loading Information placardWheels and tires451

\bThe data shown in the illustration is example
data.
The Tire and Loading Information placard shows
the following information:
= Maximum number of seats 2 according to
the maximum number of people permitted to
travel in the vehicle.
= Maximum permissible load 3 comprises the
gross weight of all vehicle occupants, load and luggage.
= Recommended tire pressure 1 for cold tires.
The recommended tire pressures are valid for
the maximum permissible load and up to the maximum permissible vehicle speed.
Please also note: = Information on permissible weights and loads
on the vehicle identi"Ncation plate
(  page 476).
= Information on tire pressure in the tire pres-
sure table (  page 447).
Further related subjects:
= Determining the maximum permissible load
(  page 452)
= Notes on tire pressure (  page 446).
Steps for Determining Correct Load Limit
The following steps have been developed as
required of all manufacturers under Title 49, Code
of U.S. Federal Regulations, Part 575, pursuant to
the "National Tra"Pc and Motor Vehicle Safety Act
of 1966".(1): Locate the statement !

(6): If your vehicle will be towing a trailer, load
from your trailer will be transferred to your
vehicle. Consult this manual to determine how
this reduces the available cargo and luggage
load capacity of your vehicle.\bNot all vehicles are permitted to tow a trailer.
Towing a trailer is only permitted if a trailer-
hitch is installed. Please consult an authorized
Mercedes-Benz dealer if you have any ques-
tions about towing a trailer with your vehicle.
Even if you have calculated the total load carefully,
you should still make sure that the maximum per-
missible gross weight and the maximum gross axle weight rating of your vehicle are not excee-ded. Details can be found on the vehicle identi"N-
cation plate.
Have your loaded vehicle !

Step 2Example 1Example 2Number of people in the vehicle (driver and occu-pants)51Distribution of the occupantsFront: 2
Rear: 3Front: 1Weight of occupantsOccupant 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)Total weight of all occupants750 lbs (340 kg)200 lbs (91 kg)
Step 3
Example 1Example 2Permissible load (maximum gross vehicle weight rating from the Tire and Loading Information plac-
ard minus the gross weight of all occupants)1500 lbs (680 kg)

Tire labeling
Overview of tire labeling
1Uniform Tire Quality Grading Standards2DOT (Department of Transportation), (TIN)
Tire *denti"Ncation Number3Maximum tire load (  page 457)4Maximum tire pressure (  page 457)5Manufacturer6Characteristics of the tire (  page 458)7Tire size designation, load-bearing capacity,
speed rating and load index (  page 458)8Tire name\bThe data shown in the illustration is example
data.
Tire Quality Grading
In accordance with the US Department of Trans-
portation\bs "Uniform Tire Quality Grading Stand-
ards", tire manufacturers are required to grade
their tires on the basis of the following three per-
formance factors:
1Tread wear grade2Traction grade3Temperature grade\bThe data shown in the illustration is example
data.\bThe classi"Ncation is not legally stipulated for
Canada, but it is generally stated.
Tread wear grade
The treadwear grade is a comparative rating based on the wear rate of the tire when testedunder controlled conditions on a speci"Ned govern-
ment test course. For example, a tire graded 150
would wear one and one-half (1=1/2=) times as
Wheels and tires455

well on the government course as a tire graded
100.
The relative performance of tires depends upon the actual conditions of their use, however, and
may depart signi"Ncantly from the norm due to var-
iations in driving habits, service practices and dif-
ferences in road characteristics and climate.
Traction grade&DANGER Risk of accident due to inade-
quate traction
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests.
Always adapt your driving style and drive
at a speed to suit the prevailing tra"Pc
and weather conditions.*NOTE Damage to the drivetrain from
wheelspinAvoid wheelspin.The traction grades, from highest to lowest, are
AA, A, B, and C. Those grades represent the tire\bs ability to stop on wet pavement as measured
under controlled conditions on speci"Ned govern-
ment test surfaces of asphalt and concrete. A tire
marked C may have poor traction performance.
Temperature grade&WARNING Risk of accident from tire over-
heating and tire failure
Excessive speed, underin"Oation, or excessive
loading, either separately or in combination, can cause excessive heat build-up and possi-
ble tire failure.
Observe the recommended tire pressure.Regularly check the pressure of all the
tires.Adjust the tire pressure, if necessary.
The temperature grades are A (the highest), B, and C, representing the tire\bs resistance to thegeneration of heat and its ability to dissipate heat
when tested under controlled conditions on a speci"Ned indoor laboratory test wheel. Sustained
high temperature can cause the material of the
tire to degenerate and reduce tire life, and exces-sive temperature can lead to sudden tire failure.
The grade C corresponds to a level of perform-
ance which all passenger car tires must meet
under the Federal Motor Safety Standard No. 109. Grades B and A represent higher levels of
performance on the laboratory test wheel than the minimum required by law.
DOT, Tire *denti"Ncation Number (TIN)
US tire regulations stipulate that every tire manu-
facturer or retreader must imprint a TIN in or on
the side wall of each tire produced.
456Wheels and tires

\bThe data shown in the image is example data.
The TIN is a unique identi"Ncation number to iden-
tify tires and comprises the following:
= DOT (Department of Transportation): tire sym-
bol marks 1 indicating that the tire complies
with the requirements of the US Department of Transportation.
= Manufacturer identi"Ncation code: manufac-
turer identi"Ncation code 2 contains details of
the tire manufacturer. New tires have a code
with two symbols. Retreaded tires have a code
with four symbols. Further information on
retreaded tires (  page 462).
= Tire size: identi"Ner 3 describes the tire size.
= Tire type code: tire type code 4 can be used
by the manufacturer as a code to describe
speci"Nc characteristics of the tire.
= Manufacturing date: manufacturing date 5
provides information about the age of a tire.
The 1st and 2nd positions represent the cal-
endar week and the 3rd and 4th positions
state the year of manufacture (e.g. "3208"
represents the 32nd week of 2008).
Information on the maximum tire load\bThe data shown in the illustration is example
data.
Maximum tire load 1 is the maximum permissi-
ble weight for which the tire is approved.
Do not overload the tires by exceeding the speci- "Ned load limit. The maximum permissible load can
be found on the vehicle\bs tire and loading informa-
tion placard on the B-pillar on the driver\bs side
(  page 451).
Speci"Ncations for maximum tire pressure\bThe data shown in the illustration is example
data.
Never exceed maximum tire pressure 1 speci-
"Ned for the tire. Always observe the recommen-
ded tire pressure for your vehicle when adjusting
the tire pressure (  page 447).
Wheels and tires457

Information on tire characteristics\bThe data shown in the image is example data.
This information describes the type of tire cord
and the number of layers in side wall 1 and
under tire tread 2.
Tire size designation, load-bearing capacity, speed
rating and load index&WARNING Risk of injury through exceed-
ing the speci"Ned tire load-bearing capa-
city or the permissible speed rating
Exceeding the speci"Ned tire load rating or the
permissible speed rating may lead to tire dam-
age and to the tires bursting.
Therefore, only use tire types and sizes
approved for your vehicle model.Observe the tire load rating and speed
rating required for your vehicle.1First letter(s)2Nominal tire width in millimeters3Aspect ratio in %4Tire code5Rim diameter6Load-bearing index7Speed rating8Load index\bThe data shown in the illustration is example
data.
Information about reading tire data can be
obtained from any quali"Ned specialist workshop.
458Wheels and tires