MERCEDES-BENZ GLA 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!

On-board computer:4 Service 5
Tires
One of the following displays will appear: = Current tire pressure and tire temperature on
the individual wheels:
= 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 operatingcondition (  page 317). Additionally, observe
the notes on cold tires (  page 315).\bThe values displayed in the on-board com-
puter may deviate from those of the tire pres-
sure gauge as they refer to sea level. At high
elevations, the tire pressure values indicated by a pressure gauge will be higher than thoseshown by the on-board computer. In this case,do not reduce the tire pressure.

q Restarting the tire pressure monitoring system
Requirements
= The recommended tire pressure is correctly
set for the respective operating status on all of
the wheels (  page 315).
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.
On-board computer:
4 Service 5
TiresSwipe downwards on 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 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 also to pay attention to the following rela-
ted topic:
= Notes on tire pressure (  page 315)
320Wheels and tires

Tire pressure loss warning system

qFunction of the tire pressure loss warning sys-
tem
The tire pressure loss warning system warns the driver by means of display messages when there
is a severe tire pressure loss.
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
= an even pressure loss on more than one tire
occurs
The system has a restricted or delayed function particularly in the following situations:
= poor ground conditions, e.g. snow or gravel
= driving with snow chains
= when adopting a very sporty driving style with
high cornering speeds or sudden acceleration
= driving with a high load
The tire pressure loss warning system is only an
aid. It is the driver\bs responsibility to set the tire
pressure to the recommended cold tire pressure
suitable for the operating situation and to check it.
Be sure to also observe the following further rela-
ted subjects:
= Notes on tire pressure (  page 315)
= Display messages about the tires
(  page 401)

q Restarting the tire pressure loss warning sys-
tem
Requirements
= The recommended tire pressure is correctly
set for the respective operating status on all
wheels.
Restart the tire pressure loss warning system in the following situations:
= The tire pressure has changed.
= The wheels or tires have been changed or
newly Ntted.On-board computer:
4 Service 5
TiresSwipe downwards on Touch Control on the
les-hand side of the steering wheel.
The Tire Pressure Control System Active
Restart message will be shown on the display.To begin restart, press Touch Control on the
les-hand side of the steering wheel.
The Tire Pressure Now OK" message will be
shown on the display.Select Yes .To conNrm restart, press Touch Control on the
les-hand side of the steering wheel.
The Run Flat Indicator Restarted message will
be shown on the display.
Aser you have driven for a few minutes, the
tire pressure loss warning system will monitor
the set pressures of all the tires.
Be sure also to pay attention to the following rela-
ted topic:
= Notes on tire pressure (  page 315)
Wheels and tires321

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 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.
322Wheels and tires

=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 348).
= Information on tire pressure in the tire pres-
sure table (  page 317).
Further related subjects:
= Determining the maximum permissible load
(  page 323)
= Notes on tire pressure (  page 315).
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 TraPc and Motor Vehicle Safety Act
of 1966".(1): Locate the statement !

Further related subjects:
= Calculation example for determining the maxi-
mum load (  page 324)
= Tire and Loading Information placard
(  page 322)
= Tire pressure table (  page 317)
= Vehicle identiNcation plate ( page 348)Calculation example for determining the maximum
load
The following table shows examples of how to cal-
culate total and load capacities with varying seat-
ing conNgurations and diMerent numbers and
sizes of occupants. The following examples use a
maximum load of 1500 lbs (680 kg). This is for
illustration purposes only. Make sure you are
using the actual load limit for your vehicle stated
on your vehicle\bs Tire and Loading Information
placard (  page 322).
The higher the weight of all the occupants, the
smaller the maximum load for luggage.
Step 1
Example 1Example 2Combined maximum weight of occupants and
load (data from the Tire and Loading Information
placard)1500 lbs (680 kg)1500 lbs (680 kg)324Wheels and tires

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 *dentiNcation Number3Maximum tire load (  page 328)4Maximum tire pressure (  page 328)5Manufacturer6Characteristics of the tire (  page 329)7Tire size designation, load-bearing capacity,
speed rating and load index (  page 329)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
326Wheels and tires

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.
Wheels and tires327

\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 333).
= 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 322).
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 317).
328Wheels and tires