Smart fortwo (2016). Service Manual

No.

Consumer

Current

Color coding

Engine control unit

5 A

Brown

Rear window wiper

15 A

Blue

Starter motor

30 A

Green

Central locking

40 A

Orange

Front windshield wiper

30 A

Green

Radio

20 A

Yellow

‑

12 V socket

15 A

Blue

Power supply control unit

5 A

Brown

Horn

15 A

Blue

‑

Central locking

15 A

Blue

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

Headlamps, daytime running lamps

25 A

Cyan

Headlamps, daytime running lamps

25 A

Cyan

‑

Exterior mirror heating

5 A

Brown

Anti-entrapment feature

25 A

Cyan

Transmission control unit

5 A

Brown

Radio amplifier

20 A

Yellow

‑

176

Fuses

Breakdown

assistance

-------------------------------------------------------------------------------------------------------------------------------------------------------------

Useful information

This Operator's Manual 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.

Read the information on qualified spe-

cialist workshops: (

page 20).

Important safety notes

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:

designation

model

When replacing tires, make sure to use the

correct:

designation

manufacturer

model

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:

suitability

legal stipulations

factory recommendations

Information on dimensions and types of

wheels and tires for your vehicle

(

page 200).

Information on air pressure for the tires on

your vehicle can be found:

on the tire and loading information table

on the driver's side B-pillar

under "tire pressure" (

page 180)

Further information on wheels and tires

can be obtained at any qualified specialist

workshop.

Operation
Information on driving

Check the tire pressures when the vehicle

is heavily laden and, if necessary, adjust

before beginning your journey.

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.

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.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

Regular checking of wheels and tires

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:

cuts in the tires

punctures in the tires

tears in the tires

bulges on tires

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 (

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 (

page 180).

The service life of tires depends, among

other things, on the following factors:

Driving style

Tire pressure

Distance covered

Notes on tire profile

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:

Summer tires: â in (3 mm)

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

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.

Only mount tires of the correct size onto the

wheels.

178

Operation

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

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.

Do not drive with tires which have too little

tread depth, as this significantly reduces

the traction on wet roads (hydroplaning).

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 (

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.

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

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

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:

Check the tire pressures (

page 180).

Vehicles for USA: restart the tire pressure

monitor (

page 185).

Snow chains

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:

never install snow chains to the front

wheels

always install snow chains in pairs to the

rear wheels.

Winter operation

179

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

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:

Snow chains may not be mounted on all

wheel/tire combinations. Permissible

wheel-tire combinations (

page 200).

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.

Local regulations may restrict the use of

snow chains. Observe the appropriate reg-

ulations if you wish to mount snow chains.

do not exceed the maximum permissible

speed of 30 mph (50 km/h).

Tire pressure
Tire pressure specifications

WARNING

Underinflated or overinflated tires pose

the following risks:

the tires may burst, especially as the

load and vehicle speed increase.

the tires may wear excessively and/or

unevenly, which may greatly impair tire

traction.

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:

monthly, at least

if the load changes

before beginning a long journey

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

(

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

(

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:

if you want to drive with an increased load

and/or

if you want to drive at higher road speeds.

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

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.

Check the tire for foreign objects.

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.

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.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

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:

if the vehicle has been parked with the

tires out of direct sunlight for at least

three hours and

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:

on the Tire and Loading Information plac-

ard on the B-pillar on the driver's side

in the tire pressure table in the fuel filler

flap (

page 98).

Underinflated or overinflated tires

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:

overheat, leading to tire defects

adversely affect handling

wear excessively and/or unevenly

have an adverse effect on fuel consumption

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:

increase the braking distance

adversely affect handling

wear excessively and/or unevenly

have an adverse effect on ride comfort

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 (

page 180).

182

Tire pressure

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

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

(

page 180).

Information on air pressure for the tires on

your vehicle can be found:

on the vehicle's Tire and Loading Informa-

tion placard on the B-pillar

in the tire pressure table in the fuel filler

flap (

page 98)

in the "Tire pressure" section

Checking tire pressures manually

To determine and set the correct tire pres-

sure, proceed as follows:

Remove the valve cap of the tire that is to be

checked.

Press the tire pressure gauge securely onto

the valve.

Read the tire pressure and compare it with

the recommended value on the Tire and

Loading Information placard (

page 180).

If the tire pressure is too low increase the

tire pressure to the recommended value.

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.

Screw the valve cap onto the valve.

Repeat these steps for the other tires.

Tire pressure monitor

General notes

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

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.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

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 (

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

(

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:

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.

If the warning lamp flashes for around a

minute and then remains lit constantly, the

tire pressure monitor is malfunctioning.

A message appears in the display in addi-

tion to the warning lamp.

Observe the information on display mes-

sages (

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.

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.

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.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

(

page 126) and the indicator and warning

lamps in the instrument cluster in the "Tires"

section (

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.

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

(

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 (

page 180).

Make sure that the tire pressure is correct

on all four wheels.

On-board computer with a color display

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.

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:

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.

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.

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:

Press the 9 or : button to select

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

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-

Loading the vehicle

185

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

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

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.

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.

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".

Step 1: Locate the statement "The combined

weight of occupants and cargo should never

186

Loading the vehicle

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

exceed XXX kg or XXX lbs." on your vehicle’s

Tire and Loading Information placard.

Step 2: Determine the combined weight of

the driver and passengers that will be rid-

ing in your vehicle.

Step 3: Subtract the combined weight of the

driver and passengers from XXX kilograms

or XXX lbs.

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).

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.

Loading the vehicle

187

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

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 (

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)

Step 2

Example 1

Example 2

Example 3

Number of people in the

vehicle (driver and

occupants)

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)

188

Loading the vehicle

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

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 (

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:

Treadwear grade: 200

Traction grade: AA

Temperature grade: A

All about wheels and tires

189

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

All passenger car tires must conform to the

statutory safety requirements in addition to

these grades.

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

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 (

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) (

page 179).

Temperature

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.

190

All about wheels and tires

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

Tire labeling

Overview of tire labeling

Uniform Tire Quality Grading Standard

(

page 194)

;

DOT, Tire Identification Number

(

page 193)

Maximum tire load (

page 193)

Maximum tire pressure (

page 182)

Manufacturer

Tire material (

page 194)

Tire size designation, load-bearing

capacity and speed rating (

page 191)

Load index (

page 193)

Tire name

The markings described above are on the tire

in addition to the tire name (sales designa-

tion) and the manufacturer's name.

Tire data is vehicle-specific and may

deviate from the data in the example.

Tire size designation, load-bearing

capacity and speed rating

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

Load bearing index

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

191

Wheels

and

tires.

-------------------------------------------------------------------------------------------------------------------------------------------------------------

Smart fortwo (2016). Service Manual - part 11