Smart fortwo (2016). Instruction — part 11
No.
Consumer
Current
Color coding
21
Engine control unit
5 A
Brown
22
Rear window wiper
15 A
Blue
23
Starter motor
30 A
Green
24
Central locking
40 A
Orange
25
Front windshield wiper
30 A
Green
26
Radio
20 A
Yellow
27
‑
‑
‑
28
12 V socket
15 A
Blue
29
Power supply control unit
5 A
Brown
30
Horn
15 A
Blue
31
‑
‑
‑
32
Central locking
15 A
Blue
33
Tail lamps, front fog lamps, hazard warning lamp
button, locking button, power windows, license
plate lighting, radio, control unit for air-con-
ditioning system, cruise control, parking aid
button, program selector button, tailgate unlock-
ing
25 A
Cyan
34
Headlamps, daytime running lamps
25 A
Cyan
35
Headlamps, daytime running lamps
25 A
Cyan
36
‑
‑
‑
37
‑
‑
‑
38
‑
‑
‑
39
‑
‑
‑
40
‑
‑
‑
41
‑
‑
‑
42
‑
‑
‑
43
Exterior mirror heating
5 A
Brown
44
Anti-entrapment feature
25 A
Cyan
45
Transmission control unit
5 A
Brown
46
Radio amplifier
20 A
Yellow
47
‑
‑
‑
48
‑
‑
‑
49
‑
‑
‑
176
Fuses
>>
Breakdown
assistance
.
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Useful information
i
This Operator's Instruction describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's Man-
ual. Country-specific differences are pos-
sible. Bear in mind that your vehicle may
not feature all functions described here.
This also applies to safety-relevant sys-
tems and functions.
i
Read the information on qualified spe-
cialist workshops: (
Y
page 20).
Important safety notes
G
WARNING
If wheels and tires of the wrong size are
used, the wheel brakes or suspension com-
ponents may be damaged. There is a risk of
an accident.
Always replace wheels and tires with those
that fulfill the specifications of the orig-
inal part.
When replacing wheels, make sure to use the
correct:
R
designation
R
model
When replacing tires, make sure to use the
correct:
R
designation
R
manufacturer
R
model
G
Warning
A flat tire severely impairs the driving,
steering and braking characteristics of
the vehicle. There is a risk of an accident.
do not drive with a flat tire. Immediately
replace the flat tire with your spare wheel,
or consult a qualified specialist workshop.
Accessories that are not approved for your
vehicle by smart or that are not being used
correctly can impair driving safety.
Before purchasing and using non-approved
accessories, visit a qualified specialist
workshop and inquire about:
R
suitability
R
legal stipulations
R
factory recommendations
Information on dimensions and types of
wheels and tires for your vehicle
(
Y
page 200).
Information on air pressure for the tires on
your vehicle can be found:
R
on the tire and loading information table
on the driver's side B-pillar
R
under "tire pressure" (
Y
page 180)
i
Further information on wheels and tires
can be obtained at any qualified specialist
workshop.
Operation
Information on driving
R
Check the tire pressures when the vehicle
is heavily laden and, if necessary, adjust
before beginning your journey.
R
While driving, pay attention to vibrations,
noises and unusual handling characteris-
tics, e.g. pulling to one side. This may
indicate that the wheels or tires are dam-
aged. If you suspect that a tire is defec-
tive, reduce your speed immediately. Stop
the vehicle as soon as possible to check the
wheels and tires for damage. Hidden tire
damage could also be causing the unusual
handling characteristics. If you find no
signs of damage, have the tires and wheels
checked at a qualified specialist work-
shop.
R
When parking your vehicle, make sure that
the tires do not get deformed by the curb or
other obstacles. If it is necessary to drive
over curbs, speed humps or similar eleva-
tions, try to do so slowly and at an obtuse
angle. Otherwise, the tires, particularly
the sidewalls, may be damaged.
Operation
177
>>
Wheels
and
tires.
Z
-------------------------------------------------------------------------------------------------------------------------------------------------------------
Regular checking of wheels and tires
G
WARNING
Damaged tires can cause tire inflation
pressure loss. As a result, you could lose
control of your vehicle. There is a risk of
accident.
Check the tires regularly for signs of dam-
age and replace any damaged tires imme-
diately.
Regularly check the wheels and tires of your
vehicle for damage, at least once a month, as
well as after driving on rough roads. Damaged
wheels can cause a loss of tire pressure. Pay
particular attention to damage such as:
R
cuts in the tires
R
punctures in the tires
R
tears in the tires
R
bulges on tires
R
deformation or severe corrosion on wheels
Regularly check the tire tread depth and the
condition of the tread across the whole width
of the tire (
Y
page 178). If necessary, turn the
front wheels to full lock in order to inspect
the inner side of the tire surface.
All wheels must have a valve cap to protect the
valve against dirt and moisture. Do not fit
anything onto the valve other than the stand-
ard valve cap or other valve caps approved for
your vehicle by smart. Do not use any other
valve caps or systems, e.g. tire pressure mon-
itoring systems.
Regularly check the pressure of all the tires
particularly prior to long trips. Adjust the
tire pressure as necessary (
Y
page 180).
The service life of tires depends, among
other things, on the following factors:
R
Driving style
R
Tire pressure
R
Distance covered
Notes on tire profile
G
WARNING
Insufficient tire tread will reduce tire
traction. The tire is no longer able to dis-
sipate water. This means that on wet road
surfaces, the risk of hydroplaning increa-
ses, in particular where speed is not adap-
ted to suit the driving conditions. There is
a risk of accident.
If the tire pressure is too high or too low,
tires may exhibit different levels of wear
at different locations on the tire tread.
Thus, you should regularly check the tread
depth and the condition of the tread across
the entire width of all tires.
Minimum tire tread depth for:
R
Summer tires: â in (3 mm)
R
M+S tires: ã in (4 mm)
For safety reasons, replace the tires before
the legally prescribed limit for the mini-
mum tire tread depth is reached.
Indicator : shows which position the bar
marking (arrow) for tread wear is integrated
into the tire tread.
Treadwear indicators (TWI) are required by
law. Six indicators are positioned on the tire
tread. They are visible once a tread depth of
approximately á in (1.6 mm) has been
reached. If this is the case, the tire is so worn
that it must be replaced.
Selecting, mounting and replacing
tires
R
Only mount tires and wheels of the same
type and make.
Exception: it is permissible to fit a dif-
ferent type or make in the event of a flat
tire.
R
Only mount tires of the correct size onto the
wheels.
178
Operation
>>
Wheels
and
tires.
-------------------------------------------------------------------------------------------------------------------------------------------------------------
R
After fitting new tires, run them in at mod-
erate speeds for the first 60 miles (100 km),
as they only reach their full performance
after this distance.
R
Do not drive with tires which have too little
tread depth, as this significantly reduces
the traction on wet roads (hydroplaning).
R
Replace the tires after six years at the lat-
est, regardless of wear.
Winter operation
General notes
Have your vehicle winterproofed at a quali-
fied specialist workshop at the onset of win-
ter.
Observe the notes in the "Changing a wheel"
section (
Y
page 196).
Driving with summer tires
At temperatures below 45 ‡ (+7 †), summer
tires lose elasticity and therefore traction
and braking power. Change the tires on your
vehicle to M+S tires. Using summer tires at
very cold temperatures could cause tears to
form, thereby damaging the tires perma-
nently. smart cannot accept responsibility
for this type of damage.
G
WARNING
Damaged tires can cause tire inflation
pressure loss. As a result, you could lose
control of your vehicle. There is a risk of
accident.
Check the tires regularly for signs of dam-
age and replace any damaged tires imme-
diately.
M+S tires
G
WARNING
M+S tires with a tire tread depth of less
than ã in (4 mm) are not suitable for use in
winter and do not provide sufficient trac-
tion. There is a risk of an accident.
M+S tires with a tread depth of less than ã
in (4 mm) must be replaced immediately.
At temperatures below 45 ‡ (+7 †) use winter
tires marked with M+S.
Only winter tires bearing the i snowflake
symbol in addition to the M+S marking pro-
vide the best possible grip in wintry road
conditions. Only these tires will allow driv-
ing safety systems such as ABS and ESP
®
to
function optimally in winter. These tires
have been developed specifically for driving
in snow.
Use M+S tires of the same make and tread on
all wheels to maintain safe handling charac-
teristics.
Always observe the maximum permissible
speed specified for the M+S tires you have
mounted. Therefore, only use tire types and
sizes approved for smart. Observe the tire
load rating and speed rating required for
smart.
Tires with a specified direction of rotation
have additional benefits, e.g. if there is a
risk of aquaplaning. These advantages can
only be gained if the tires are fitted corre-
sponding to the direction of rotation.
An arrow on the sidewall of the tire indicates
its correct direction of rotation.
When you have mounted the M+S tires:
X
Check the tire pressures (
Y
page 180).
X
Vehicles for USA: restart the tire pressure
monitor (
Y
page 185).
Snow chains
G
WARNING
If snow chains are installed to the front
wheels, they may drag against the vehicle
body or chassis components. This could
cause damage to the vehicle or the tires.
There is a risk of an accident.
To avoid hazardous situations:
R
never install snow chains to the front
wheels
R
always install snow chains in pairs to the
rear wheels.
Winter operation
179
>>
Wheels
and
tires.
Z
-------------------------------------------------------------------------------------------------------------------------------------------------------------
!
Vehicles with steel wheels: if you mount
snow chains on steel wheels, you may dam-
age the hub caps. Remove the hub caps from
the relevant wheels before mounting the
snow chains.
smart recommends that you only use snow
chains that have been specially approved for
smart. For more information, please contact
the smart center or a qualified specialist
workshop.
Bear in mind that snow chains are designed
for a certain wheel size. If you mount tires
that are larger or smaller than the original
tires, you will require new snow chains of the
correct size.
If you intend to mount snow chains, please
bear the following points in mind:
R
Snow chains may not be mounted on all
wheel/tire combinations. Permissible
wheel-tire combinations (
Y
page 200).
R
Only use snow chains when driving on roads
completely covered by snow. Remove the
snow chains as soon as possible when you
come to a road that is not snow-covered.
R
Local regulations may restrict the use of
snow chains. Observe the appropriate reg-
ulations if you wish to mount snow chains.
R
do not exceed the maximum permissible
speed of 30 mph (50 km/h).
Tire pressure
Tire pressure specifications
G
WARNING
Underinflated or overinflated tires pose
the following risks:
R
the tires may burst, especially as the
load and vehicle speed increase.
R
the tires may wear excessively and/or
unevenly, which may greatly impair tire
traction.
R
the driving characteristics, as well as
steering and braking, may be greatly
impaired.
There is a risk of an accident.
Follow recommended tire inflation pres-
sures and check the pressure of all the tires
including the spare wheel:
R
monthly, at least
R
if the load changes
R
before beginning a long journey
R
under different operating conditions,
e.g. off-road driving
If necessary, correct the tire pressure.
The specifications on the sample Tire and
Loading Information placard and tire pres-
sure tables are examples. Tire pressure spec-
ifications are vehicle-specific and may
deviate from the data shown here. The tire
pressure specifications that are valid for
your vehicle can be found on the Tire and
Loading Information placard and tire pres-
sure table on the vehicle.
The recommended tire pressures for the tires
mounted at the factory can be found on the
labels described here.
Further information on tire pressures can be
obtained at a qualified specialist workshop.
:
Recommended tire pressures
The Tire and Loading Information placard is
on the B-pillar on the driver's side
(
Y
page 185).
The Tire and Loading Information placard
contains the recommended tire pressures for
cold tires. The recommended tire pressures
are valid for the maximum permissible load
and up to the maximum permissible vehicle
speed.
The tire pressure table is on the inside of the
fuel filler flap.
180
Tire pressure
>>
Wheels
and
tires.
-------------------------------------------------------------------------------------------------------------------------------------------------------------
Example: tire pressure table for all tires per-
mitted for this vehicle by the factory
The tire pressure table contains the recom-
mended pressures for cold tires for various
operating conditions, i.e. differing load and
speed conditions.
Example: tire pressure table with tire dimen-
sions
If a tire size precedes a tire pressure, the
tire pressure information following is only
valid for that tire size. The load conditions
"partially laden" and "fully laden" are
defined in the table for different numbers of
occupants and amounts of luggage. The actual
number of seats may differ.
Some tire pressure tables show only the rim
diameters instead of the full tire size, e.g.
R18. The rim diameter is part of the tire size
and can be found on the tire sidewall
(
Y
page 191).
If the tire pressures have been set to the
lower values for lighter loads and/or lower
road speeds, the pressures should be reset to
the higher values:
R
if you want to drive with an increased load
and/or
R
if you want to drive at higher road speeds.
i
The tire pressures for increased loads
and/or higher road speeds, shown in the
tire pressure table, may have a negative
effect on driving comfort.
If the tire pressure is not set correctly, this
can lead to an excessive build-up of heat and
a sudden loss of pressure.
For more information, contact a qualified
specialist workshop.
Important notes on tire pressure
G
WARNING
If the tire pressure drops repeatedly, the
wheel, valve or tire may be damaged. Tire
pressure that is too low may result in a tire
blow-out. There is a risk of an accident.
R
Check the tire for foreign objects.
R
Check whether the wheel is losing air or
the valve is leaking.
If you are unable to rectify the damage,
contact a qualified specialist workshop.
G
WARNING
If you fit unsuitable accessories onto tire
valves, the tire valves may be overloaded
and malfunction, which can cause tire pres-
sure loss. Due to their design, retrofitted
tire pressure monitors keep the tire valve
open. This can also result in tire pressure
loss. There is a risk of an accident.
Only screw the standard valve cap or other
valve caps approved by Mercedes-Benz for
your vehicle onto the tire valve.
Tire pressure
181
>>
Wheels
and
tires.
Z
-------------------------------------------------------------------------------------------------------------------------------------------------------------
Use a suitable pressure gauge to check the
tire pressure. The outer appearance of a tire
does not permit any reliable conclusion
about the tire pressure. On vehicles equip-
ped with the electronic tire pressure moni-
tor, the tire pressure can be checked in the
on-board computer.
The tire temperature and pressure increase
when the vehicle is in motion. This is
dependent on the driving speed and the load.
Therefore, you should only correct tire pres-
sures when the tires are cold.
The tires are cold:
R
if the vehicle has been parked with the
tires out of direct sunlight for at least
three hours and
R
if the vehicle has not been driven further
than 1 mile (1.6 km)
The tire temperature changes depending on
the outside temperature, the vehicle speed
and the tire load. If the tire temperature
changes by 18 ‡ (10 †), the tire pressure
changes by approximately 10 kPa (0.1 bar/
1.5 psi). Take this into account when checking
the pressure of warm tires. Only correct the
tire pressure if it is too low for the current
operating conditions. If you check the tire
pressure when the tires are warm, the result-
ing value will be higher than if the tires were
cold. This is normal. Do not reduce the tire
pressure to the value specified for cold
tires. The tire pressure would otherwise be
too low.
Observe the recommended tire pressures for
cold tires:
R
on the Tire and Loading Information plac-
ard on the B-pillar on the driver's side
R
in the tire pressure table in the fuel filler
flap (
Y
page 98).
Underinflated or overinflated tires
G
WARNING
Tires with pressure that is too low can
overheat and burst as a consequence. In
addition, they also suffer from excessive
and/or irregular wear, which can severely
impair the braking properties and the
driving characteristics. There is a risk of
an accident.
Avoid tire pressures that are too low in all
the tires, including the spare wheel.
Underinflated tires
Underinflated tires may:
R
overheat, leading to tire defects
R
adversely affect handling
R
wear excessively and/or unevenly
R
have an adverse effect on fuel consumption
G
WARNING
Tires with excessively high pressure can
burst because they are damaged more easily
by road debris, potholes etc. In addition,
they also suffer from irregular wear, which
can severely impair the braking properties
and the driving characteristics. There is a
risk of an accident.
Avoid tire pressures that are too high in all
the tires, including the spare wheel.
Overinflated tires
Overinflated tires may:
R
increase the braking distance
R
adversely affect handling
R
wear excessively and/or unevenly
R
have an adverse effect on ride comfort
R
be more susceptible to damage
Maximum tire pressures
:
Example: maximum permissible tire
pressure
Never exceed the maximum permissible tire
inflation pressure. Always observe the rec-
ommended tire pressure for your vehicle when
adjusting the tire pressure (
Y
page 180).
182
Tire pressure
>>
Wheels
and
tires.
-------------------------------------------------------------------------------------------------------------------------------------------------------------
i
The actual values for tires are vehicle-
specific and may deviate from the values in
the illustration.
Checking the tire pressures
Important safety notes
Observe the notes on tire pressure
(
Y
page 180).
Information on air pressure for the tires on
your vehicle can be found:
R
on the vehicle's Tire and Loading Informa-
tion placard on the B-pillar
R
in the tire pressure table in the fuel filler
flap (
Y
page 98)
R
in the "Tire pressure" section
Checking tire pressures manually
To determine and set the correct tire pres-
sure, proceed as follows:
X
Remove the valve cap of the tire that is to be
checked.
X
Press the tire pressure gauge securely onto
the valve.
X
Read the tire pressure and compare it with
the recommended value on the Tire and
Loading Information placard (
Y
page 180).
X
If the tire pressure is too low increase the
tire pressure to the recommended value.
X
If the tire pressure is too high, release
air. To do this, press down the metal pin in
the valve using the tip of a pen, for exam-
ple. Then check the tire pressure again
using the tire pressure checker.
X
Screw the valve cap onto the valve.
X
Repeat these steps for the other tires.
Tire pressure monitor
General notes
i
This function is only available in the
USA.
If a tire pressure monitor is installed, the
vehicle's wheels have sensors that monitor
the tire pressures in all four tires. The tire
pressure monitor warns you if the pressure
drops in one or more of the tires. The tire
pressure monitor only functions if the cor-
responding sensors are fitted to all wheels.
Important safety notes
G
WARNING
Each tire, including the spare (if provi-
ded), should be checked at least once every
two weeks when cold and inflated to the
pressure recommended by the vehicle man-
ufacturer on the Tire and Loading Informa-
tion placard on the driver's door B-pillar
or the tire pressure label on the inside of
the fuel filler flap. If your vehicle has
tires of a different size than the size indi-
cated on the Tire and Loading Information
placard or, if available, the tire pressure
label, you should determine the proper tire
pressure for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure moni-
toring system (TPMS) that illuminates a low
tire pressure telltale when one or more of
your tires are significantly underinflated.
Accordingly, when the low tire pressure
telltale lights up, you should stop and
check your tires as soon as possible, and
inflate them to the proper pressure. Driv-
ing on a significantly underinflated tire
causes the tire to overheat and can lead to
tire failure.
Underinflation also reduces fuel effi-
ciency and tire tread life, and may affect
the vehicle's handling and stopping abil-
ity. Please note that the TPMS is not a sub-
stitute for proper tire maintenance, and it
is the driver's responsibility to maintain
correct tire pressure, even if underinfla-
tion has not reached the level to trigger
illumination of the TPMS low tire pressure
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 com-
bined with the low tire pressure telltale.
When the system detects a malfunction, the
Tire pressure
183
>>
Wheels
and
tires.
Z
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warning lamp will flash for approximately
a minute and then remain continuously
illuminated. This sequence will be repea-
ted every time the vehicle is started as long
as the malfunction exists. When the mal-
function indicator is illuminated, the sys-
tem may not be able to detect or signal low
tire pressure as intended.
TPMS malfunctions may occur for a variety
of reasons, including the installation of
incompatible replacement or alternate
tires or wheels on the vehicle that prevent
the TPMS from functioning properly. Always
check the TPMS malfunction telltale after
replacing one or more tires or wheels on
your vehicle to ensure that the replacement
or alternate Tires and wheels allow 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 sit-
uation (
Y
page 180). Note that the correct tire
pressure for the current operating situation
must first be taught-in to the tire pressure
monitor. If there is a substantial loss of
pressure, the warning threshold for the warn-
ing message is aligned to the reference val-
ues taught-in. Restart the tire pressure mon-
itor after adjusting to the cold tire pressure.
The current pressures are saved as new ref-
erence values. As a result, a warning message
will appear if the tire pressure drops sig-
nificantly.
The tire pressure monitor does not warn you of
an incorrectly set tire pressure. Observe the
notes on the recommended tire pressure
(
Y
page 180).
The tire pressure monitor is not able to warn
you of a sudden loss of pressure, e.g. if the
tire is penetrated by a foreign object. In the
event of a sudden loss of pressure, bring the
vehicle to a halt by braking carefully. Avoid
abrupt steering maneuvers.
The tire pressure monitor has a yellow warn-
ing lamp in the instrument cluster for indi-
cating a pressure loss or malfunction.
Whether the warning lamp flashes or lights up
indicates whether a tire pressure is too low
or the tire pressure monitor is malfunction-
ing:
R
If the warning lamp is lit continuously, the
tire pressure on one or more tires is sig-
nificantly too low. The tire pressure mon-
itor is not malfunctioning.
R
If the warning lamp flashes for around a
minute and then remains lit constantly, the
tire pressure monitor is malfunctioning.
i
A message appears in the display in addi-
tion to the warning lamp.
Observe the information on display mes-
sages (
Y
page 126).
If the tire pressure monitor is malfunction-
ing, it may take up to ten minutes for the tire
pressure warning lamp to inform you of the
malfunction. The malfunction will be indi-
cated first by the tire pressure 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 a few minutes of driving.
The operation of the tire pressure monitor
can be affected by interference from radio
transmitting equipment (e.g. radio head-
phones, two-way radios) that may be being
operated in or near the vehicle.
Tire pressure monitor warning messages
If the tire pressure monitor detects a pres-
sure loss in one or more tires, a warning mes-
sage is shown in the display. The yellow warn-
ing light in the tire pressure monitor lights
up. For certain display messages a warning
tone also sounds.
R
If the
Correct Tire Pressure
message
appears in the display, the tire pressure in
at least one tire is too low. Correct the tire
pressure at the next opportunity.
R
If the
Tire Pressure Warning Tire
Failure
message appears in the display,
the tire pressure in one or more tires has
dropped suddenly and the tires must be
checked.
Observe the instructions and safety notes for
the display messages in the "Tires" section
184
Tire pressure
>>
Wheels
and
tires.
-------------------------------------------------------------------------------------------------------------------------------------------------------------
(
Y
page 126) and the indicator and warning
lamps in the instrument cluster in the "Tires"
section (
Y
page 139).
Restarting the tire pressure monitor
When you restart the tire pressure monitor,
all existing warning messages are deleted
and the warning lamps go out. The monitor
uses the currently set tire pressures as the
reference values for monitoring. In most
cases, the tire pressure monitor will auto-
matically detect the new reference values
after you have changed the tire pressure.
However, you can also define reference values
manually as described here. The tire pres-
sure monitor then monitors the new tire pres-
sure values.
X
Set the tire pressure to the value recom-
mended for the corresponding driving sit-
uation on the Tire and Loading Information
placard on the B-pillar on the driver's side
(
Y
page 180).
Additional tire pressure values for dif-
ferent loads can also be found on the tire
pressure table on the inside of the fuel
filler flap (
Y
page 180).
X
Make sure that the tire pressure is correct
on all four wheels.
On-board computer with a color display
X
To restart the tire pressure monitor: press
the 9 or : button on the steering
wheel to select the
Settings
menu and
press a on the steering wheel to con-
firm.
X
Press the 9 or : button to select the
Tire Pressure Monitor
submenu and con-
firm with a.
The
Tire Pressure Monitor Use Cur‐
rent Pressures As New Reference Val‐
ues?
message appears in the display.
If you wish to confirm the restart:
X
Press the 9 or : button to select
yes
and press the a button to confirm.
The
Tire Pressure Monitor Restarted
message appears in the display.
X
Press a to confirm.
After a short while, the message is also
hidden without pressing the a button.
After driving for a few minutes, the system
checks whether the current tire pressures
are within the specified range. The new
tire pressures are then accepted as refer-
ence values and monitored.
i
If the
Tire Pressure Monitor Restar‐
ted
message does not appear after approx-
imately 5 seconds, the restart was not suc-
cessful. If this occurs, repeat the restart.
If you wish to cancel the restart:
X
Press the 9 or : button to select
no
and press the a button to confirm.
The tire pressure values stored at the last
restart will continue to be monitored.
Radio type approval for the tire pressure
monitor
Country
Radio type approval number
USA
FCC ID: MRXMW2433A
FCC ID: MRXGG4
FCC ID: MRXMC34MA4
Canada
IC: 2546A-MW2433A
IC: 2546A-GG4
IC: 2546A-MC34MA4
Loading the vehicle
Instruction labels for tires and loads
G
WARNING
Overloaded tires can overheat, causing a
blowout. Overloaded tires can also impair
the steering and driving characteristics
and lead to brake failure. There is a risk of
accident.
Observe the load rating of the tires. The
load rating must be at least half of the GAWR
of your vehicle. Never overload the tires by
exceeding the maximum load.
Two instruction labels on your vehicle show
the maximum possible load.
(1) The Tire and Loading Information plac-
ard is on the B-pillar on the driver's
side. The Tire and Loading Information
placard shows the maximum permissible
number of occupants and the maximum
permissible vehicle load. It also con-
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tains details of the tire sizes and corre-
sponding pressures for tires mounted at
the factory.
(2) The vehicle identification plate is on
the B-pillar on the driver's side. The
vehicle identification plate informs you
of the gross vehicle weight rating. It is
made up of the vehicle weight, all vehicle
occupants, the fuel and the cargo. You can
also find information about the maximum
gross axle weight rating on the front and
rear axle.
The maximum gross axle weight rating is
the maximum weight that can be carried
by one axle (front or rear axle). Never
exceed the maximum load or the maximum
gross axle weight rating for the front or
rear axle.
:
B-pillar, driver's side
Maximum permissible gross vehicle
weight rating
X
Specification for maximum gross vehicle
weight : is listed in the Tire and Loading
Information placard: "The combined
weight of occupants and cargo should never
exceed XXX kilograms or XXX lbs."
The gross weight of all vehicle occupants,
load and luggage must not exceed the speci-
fied value.
i
The specifications shown on the Tire and
Loading Information placard in the illus-
tration are examples. The maximum per-
missible gross vehicle weight rating is
vehicle-specific and may differ from that
in the illustration. You can find the valid
maximum permissible gross vehicle weight
rating for your vehicle on the Tire and
Loading Information placard.
Number of seats
Maximum number of seats : indicates the
maximum number of occupants allowed to
travel in the vehicle. This information can be
found on the Tire and Loading Information
placard.
i
The specifications shown on the Tire and
Loading Information placard in the illus-
tration are examples. The number of seats
is vehicle-specific and can differ from the
details shown. The number of seats in your
vehicle can be found on the Tire and Load-
ing Information placard.
Determining the correct load limit
Step-by-step instructions
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 Traffic and Motor
Vehicle Safety Act of 1966".
X
Step 1: Locate the statement "The combined
weight of occupants and cargo should never
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exceed XXX kg or XXX lbs." on your vehicle’s
Tire and Loading Information placard.
X
Step 2: Determine the combined weight of
the driver and passengers that will be rid-
ing in your vehicle.
X
Step 3: Subtract the combined weight of the
driver and passengers from XXX kilograms
or XXX lbs.
X
Step 4: The resulting figure equals the
available amount of cargo and luggage load
capacity. For example: at a sum “XXX” of
1400 lbs and five occupants each weighing
150 lbs, the amount of available cargo and
luggage load capacity is 650 lbs (1400 - 750
(5 x 150) = 650 lbs).
X
Step 5: Determine the combined weight of
luggage and cargo being loaded on the
vehicle. That weight may not safely exceed
the available cargo and luggage load capa-
city calculated in step 4.
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Example: steps 1 to 3
The following table shows examples on how to calculate total and cargo load capacities with
varying seating configurations and number and size of occupants. The following examples use
a load limit 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's Tire and Loading Information
placard (
Y
page 185).
The greater the combined weight of the occupants, the lower the maximum luggage load.
Step 1
Example 1
Example 2
Example 3
Combined maximum
weight of occupants and
cargo (data from the
Tire and Loading Infor-
mation placard)
1500 lbs (680 kg)
1500 lbs (680 kg)
1500 lbs (680 kg)
Step 2
Example 1
Example 2
Example 3
Number of people in the
vehicle (driver and
occupants)
5
3
1
Distribution of the
occupants
Front: 2
Rear: 3
Front: 1
Rear: 2
Front: 1
Weight of the occupants Occupant 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)
Occupant 2: 190 lbs
(86 kg)
Occupant 3: 150 lbs
(68 kg)
Occupant 1: 150 lbs
(68 kg)
Gross weight of all
occupants
750 lbs (340 kg)
540 lbs (245 kg)
150 lbs (68 kg)
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Step 3
Example 1
Example 2
Example 3
Permissible load (max-
imum gross vehicle
weight rating from the
Tire and Loading Infor-
mation placard minus
the gross weight of all
occupants)
1500 lbs (680 kg)
Ò750 lbs (340 kg) =
750 lbs (340 kg)
1500 lbs (680 kg)
Ò540 lbs (245 kg) =
960 lbs (435 kg)
1500 lbs (680 kg)
Ò150 lbs (68 kg) =
1350 lbs (612 kg)
Vehicle identification plate
Even if you have calculated the total cargo
carefully, you should still make sure that the
gross vehicle weight rating and the gross
axle weight rating are not exceeded. Details
can be found on the vehicle identification
plate on the B-pillar on the driver's side of
the vehicle (
Y
page 185).
Permissible gross vehicle weight: the gross
weight of the vehicle, all passengers, load
and trailer load/noseweight (if applicable)
must not exceed the permissible gross vehi-
cle weight.
Gross axle weight rating: the maximum per-
missible weight that can be carried by one
axle (front or rear axle).
To ensure that your vehicle does not exceed
the maximum permissible values (gross vehi-
cle weight and maximum gross axle weight
rating), have your loaded vehicle (including
driver, occupants, cargo, and full trailer
load if applicable) weighed on a suitable
vehicle weighbridge.
All about wheels and tires
Uniform Tire Quality Grading Stand-
ards
Overview of Tire Quality Grading Stand-
ards
Uniform Tire Quality Grading Standards are
U.S. government specifications. Their pur-
pose is to provide drivers with uniform reli-
able information on tire performance data.
Tire manufacturers have to grade tires using
three performance factors: : tread wear
grade, ; traction grade and = temperature
grade. These regulations do not apply to Can-
ada. Nevertheless, all tires sold in North
America are provided with the corresponding
quality grading markings on the sidewall of
the tire.
Quality grades can be found, where applica-
ble, on the tire sidewall between the tread
shoulder and maximum tire width.
Example:
R
Treadwear grade: 200
R
Traction grade: AA
R
Temperature grade: A
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All passenger car tires must conform to the
statutory safety requirements in addition to
these grades.
i
The actual values for tires are vehicle-
specific and may deviate from the values in
the illustration.
Treadwear
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified
U.S. government course. For example, a tire
graded 150 would wear one and one-half times
as well on the government test track as a tire
graded 100.
The relative performance of tires depends
upon the actual conditions of their use, how-
ever, and may depart significantly from the
norm due to variations in driving habits,
service practices and differences in road
characteristics and climate conditions.
Traction
G
WARNING
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning, or peak traction
characteristics.
!
Avoid wheelspin. This can lead to damage
to the drive train.
The traction grades – from highest to lowest –
are AA, A, B and C. Those grades represent the
tire's ability to stop on wet pavement as
measured under controlled conditions on
specified government test surfaces of
asphalt and concrete. A tire marked C may
have poor traction performance.
The safe speed on a wet, snow covered or icy
road is always lower than on dry road surfa-
ces.
You should pay special attention to road con-
ditions when temperatures are around freez-
ing point.
smart recommends a minimum tread depth of
ã in (4 mm) on all four winter tires. Observe
the legally required minimum tire tread
depth (
Y
page 178). Winter tires can reduce
the braking distance on snow-covered surfa-
ces in comparison with summer tires. The
braking distance is still much further than on
surfaces that are not icy or covered with snow.
Take appropriate care when driving.
Further information on winter tires (M+S
tires) (
Y
page 179).
Temperature
G
WARNING
The temperature grade for this tire is
established for a tire that is properly
inflated and not overloaded. Excessive
speed, underinflation, or excessive load-
ing, either separately or in combination,
can cause excessive heat build-up and pos-
sible tire failure.
The temperature grades are A (the highest), B
and C. They represent the tire's resistance to
the generation of heat and its ability to dis-
sipate heat when tested under controlled con-
ditions on a specified indoor laboratory test
wheel. Sustained high temperature can cause
the material of the tire to degenerate and
reduce tire life, and excessive temperature
can lead to sudden tire failure. The grade C
corresponds to a level of performance which
all passenger car tires must meet under the
Federal Motor Vehicle Safety Standard No.
109. Grades B and A represent higher levels of
performance on the laboratory test wheel than
the minimum required by law.
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Tire labeling
Overview of tire labeling
:
Uniform Tire Quality Grading Standard
(
Y
page 194)
;
DOT, Tire Identification Number
(
Y
page 193)
=
Maximum tire load (
Y
page 193)
?
Maximum tire pressure (
Y
page 182)
A
Manufacturer
B
Tire material (
Y
page 194)
C
Tire size designation, load-bearing
capacity and speed rating (
Y
page 191)
D
Load index (
Y
page 193)
E
Tire name
The markings described above are on the tire
in addition to the tire name (sales designa-
tion) and the manufacturer's name.
i
Tire data is vehicle-specific and may
deviate from the data in the example.
Tire size designation, load-bearing
capacity and speed rating
G
WARNING
Exceeding the stated tire load-bearing
capacity and the approved maximum speed
could lead to tire damage or the tire burst-
ing. There is a risk of accident.
Therefore, only use tire types and sizes
approved for your vehicle model. Observe
the tire load rating and speed rating
required for your vehicle.
:
Tire width
;
Nominal aspect ratio in %
=
Tire code
?
Rim diameter
A
Load bearing index
B
Speed rating
General: depending on the manufacturer's
standards, the size imprinted in the tire wall
may not contain any letters or may contain one
letter that precedes the size description.
If there is no letter preceding the size
description (as shown above): these are
passenger vehicle tires according to Euro-
pean manufacturing standards.
If "P" precedes the size description: these
are passenger vehicle tires according to U.S.
manufacturing standards.
If "LT" precedes the size description: these
are light truck tires according to U.S. man-
ufacturing standards.
If "T" precedes the size description: compact
emergency wheels with high tire pressure
that are only designed for temporary use in an
emergency.
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 calculated by dividing the tire width
by the tire height.
Tire code: tire code = specifies the tire
type. "R" represents radial tires; "D" repre-
sents diagonal tires; "B" represents diago-
nal radial tires.
All about wheels and tires
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