MERCEDES-BENZ GLS 2023 Owners Manual

the low tire pressure telltale illuminates, you
should stop and check your tires as soon as
possible, and inOate them to the proper pres-
sure. Driving on a signiNcantly under-inOated
tire causes the tire to overheat and can lead
to tire failure. Under-inOation also reduces fuel
ePciency and tire tread life, and may aMect
the vehicle!

=Tire pressure will be displayed after driving a
few minutes
= Tire Pressure Monitor Active : the teach-in
process of the system is not yet complete. The
tire pressures are already being monitored.
Compare the tire pressure with the recom-
mended tire pressure for the current operating
condition (  page 377). Additionally, observe
the notes on cold tires (  page 375).\bThe values displayed in the on-board com-
puter may deviate from those of the tire pres-
sure gage as they refer to sea level. At high
elevations, the tire pressure value indicated by a pressure gage is higher than that shownby the on-board computer. Do not reduce thetire pressure in this case.
Restarting the tire pressure monitoring system
Requirements
= The recommended tire pressure is correctly
set for the respective operating condition in all
of the wheels (  page 375).
Restart the tire pressure monitoring system in the
following situations:
= The tire pressure has been changed.
= The wheels or tires have been changed or
newly installed.
On-board computer: 4 Service 5
Tires
Swipe downwards on the Touch Control on the
les-hand side of the steering wheel.
The Use Current Pressures as New Refer-
ence Values message will be shown on the
instrument display.To restart, press the Touch Control on the les-
hand side of the steering wheel.
The Tire Press. Monitor Restarted message
will be shown on the instrument display.
Current warning messages will be deleted and
the yellow w warning lamp will go out.
Aser you have been driving for a few minutes,
the system will check whether the current tire
pressures are within the speciNed range. The
current tire pressures will then be accepted as
reference values and monitored.
Be sure to also pay attention to the following rela-
ted topic:
= Notes on tire pressure (  page 375)
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
380Wheels and tires

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 placard\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 identiNcation plate
(  page 411).
= Information on tire pressure in the tire pres-
sure table (  page 377).
Further related subjects:
= Determining the maximum permissible load
(  page 381)
= Notes on tire pressure (  page 375).
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
Wheels and tires381

the "National TraPc and Motor Vehicle Safety Act
of 1966".(1): Locate the statement !

Step 1Example 1Example 2Combined maximum weight of occupants and
load (data from the Tire and Loading Information
placard)1500 lbs (680 kg)1500 lbs (680 kg)
Step 2
Example 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)Wheels and tires383

Step 3Example 1Example 2Permissible load (maximum gross vehicle weightrating 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 *dentiNcation Number3Maximum tire load (  page 387)4Maximum tire pressure (  page 387)5Manufacturer6Characteristics of the tire (  page 388)7Tire size designation, load-bearing capacity,
speed rating and load index (  page 388)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 classiNcation 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 speciNed govern-
ment test course. For example, a tire graded 150
would wear one and one-half (1=1/2=) times as
Wheels and tires385

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 signiNcantly 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 traPc
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 speciNed 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, underinOation, 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 speciNed 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 *dentiNcation 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.
386Wheels and tires

\bThe data shown in the image is example data.
The TIN is a unique identiNcation 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 identiNcation code: manufac-
turer identiNcation 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 392).
= Tire size: identiNer 3 describes the tire size.
= Tire type code: tire type code 4 can be used
by the manufacturer as a code to describe
speciNc 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 380).
SpeciNcations 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 377).
Wheels and tires387

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 speciNed tire load-bearing capa-
city or the permissible speed rating
Exceeding the speciNed 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 qualiNed specialist workshop.
388Wheels and tires