2013 MERCEDES-BENZ SL-CLASS ROADSTER weight

TIREFIT kit ..........................................
510
Tire pressure Calling up (on-board computer)
.....534
Checking manually ........................533
Display message ............................ 247
Maximum ....................................... 532
Notes ............................................. 531
Not reached (TIREFIT) .................... 512
Reached (TIREFIT) .......................... 512
Recommended ............................... 529
Tire pressure loss warning system
Important safety notes .................. 533
Restarting ...................................... 533
Tire pressure monitoring system
Function/notes ............................. 534
Restarting ...................................... 536
Warning lamp ................................. 266
Tires
Aspect ratio (definition) ................. 547
Average weight of the vehicle
occupants (definition) .................... 545
Bar (definition) ............................... 545
Changing a wheel .......................... 547
Characteristics .............................. 545
Checking ........................................ 527
Definition of terms ......................... 545
Direction of rotation ......................548
Display message ............................ 247
Distribution of the vehicle
occupants (definition) .................... 547
DOT, Tire Identification Number
(TIN) ............................................... 544
DOT (Department of
Transportation) (definition) ............ 545
GAWR (Gross Axle Weight Rating)
(definition) ..................................... 546
GVW (Gross Vehicle Weight)
(definition) ..................................... 546
GVWR (Gross Vehicle Weight
Rating) (definition) .........................546
Important safety notes .................. 526
Increased vehicle weight due to
optional equipment (definition) ...... 546
Kilopascal (kPa) (definition) ........... 546
Labeling (overview) ........................ 541
Load bearing index (definition) ...... 547
Load index ..................................... 544
Load index (definition) ...................546Maximum loaded vehicle weight
(definition) .....................................
546
Maximum load on a tire
(definition) ..................................... 546
Maximum permissible tire
pressure (definition) ....................... 546
Maximum tire load
.........................544
Maximum tire load (definition) .......546
MOExtended tires .......................... 528
Optional equipment weight
(definition) ..................................... 547
Overview ........................................ 526
PSI (pounds per square inch)
(definition) ..................................... 546
Replacing ....................................... 547
Service life ..................................... 528
Sidewall (definition) .......................547
Speed rating (definition) ................ 546
Storing ........................................... 548
Structure and characteristics
(definition) ..................................... 545
Temperature .................................. 541
TIN (Tire Identification Number)
(definition) ..................................... 547
Tire bead (definition) ......................547
Tire pressure (definition) ................ 547
Tire pressures (recommended) ...... 545
Tire size (data) ............................... 552
Tire size designation, load-bearing
capacity, speed rating .................... 541
Tire tread ....................................... 527
Tire tread (definition) .....................547
Total load limit (definition) ............. 547
Traction ......................................... 540
Traction (definition) ....................... 547
Tread wear ..................................... 540
Uniform Tire Quality Grading
Standards ...................................... 540
Uniform Tire Quality Grading
Standards (definition) .................... 545
Unladen weight (definition) ............ 546
Wear indicator (definition) .............547
Wheel rim (definition) .................... 546
see Flat tire
Towing
Important safety guidelines ...........518
Installing the towing eye ................ 51824
Index

When the air bags are deployed, a small
amount of powder is released. The powder
generally
does
not constitute a health hazard
and does not indicate that there is a fire in the
vehicle. In order to prevent potential
breathing difficulties, you should leave the
vehicle as soon as it is safe to do so. If you
have any breathing difficulty but cannot get
out of the vehicle after the air bag inflates,
then get fresh air by opening a window or
door. G
WARNING
In order to reduce the potential danger of
injuries caused during the deployment of the
front air bags, the driver and front passenger
must always be correctly seated and wear
their seat belts.
For maximum protection in the event of a
collision, you must always be in the normal
seat position with your back against the
backrest. Fasten

your seat belt and make sure
that it is correctly positioned on your body.
As the air bag inflates with considerable
speed and force, a proper seating position
and correct positioning of the hands on the
steering wheel will help to keep you at a safe
distance from the air bag. Occupants who are
not wearing their seat belt, are not seated
properly or are too close to the air bag can be
seriously injured or killed by an air bag, as it
inflates with great force instantaneously:
R sit with the seat belt fastened correctly and
in a position that is as upright as possible
with your back against the backrest.
R move the driver's seat as far back as
possible, still permitting proper operation
of vehicle controls. The distance from the
center of the driver's chest to the middle of
the air bag cover on the steering wheel
must be at least 10 inches (25 cm). You
should be able to accomplish this by
adjusting the seat and steering wheel. If
you have any difficulties, please contact a
qualified specialist workshop. R
do not
lean your head or chest close to the
steering wheel or dashboard.
R only hold the steering wheel on the outside.
Placing hands and arms inside the rim of
the steering wheel can increase the risk
and potential severity of hand/arm injuries
if the air bag inflates.
R adjust the front-passenger seat as far back
as possible from the dashboard when the
seat is occupied.
R occupants, especially children, should
never place their bodies or lean their heads
in the area of the door where the side
impact air bag and/or head bag inflates.
This could result in serious injuries or death
should the side impact air bag/head bag be
deployed. Always sit as upright as possible,
wear the seat belt properly and use an
appropriately sized infant restraint, toddler
restraint or booster seat recommended for
the size and weight of the child.
Failure to follow these instructions can result
in severe injuries to you or other occupants.
If you sell your vehicle, it is important that you
make the buyer aware of this safety
information. Be sure to give the buyer this
Operator's Manual. G
WARNING
If the side impact air bag and/or head bag is
deployed in

the event of a side impact and the
front passenger, especially a child, is not
properly seated or restrained when next to a
side impact air bag/head bag, injuries are
possible due to the rapid inflation of the side
impact air bag/head bag.
To help avoid the possibility of injury, please
follow these guidelines:
(1) Always sit as upright as possible, and use the seat belts properly.
Make sure that children 12 years
old and

under use an appropriately
sized child restraint, infant
restraint or booster seat Occupant safety
39
Safety
Z

recommended for the size and
weight of the child.
(2) Always wear seat belts properly.
If the air bags are deployed, you will hear a
bang, and

a small amount of powder may also
be released. Only in rare cases will the bang
affect your hearing. The powder that is
released generally does not constitute a
health hazard. The 6 SRS warning lamp
lights up.
The air bags are deployed if the air bag control
unit detects the need for deployment. Only in
the event of such a situation will the air bags
provide their supplemental protection.
If the driver and front passenger do not wear
their seat belts, it is not possible for the air
bags to provide their supplemental
protection.
In the event of other types of impacts and
impacts below air bag deployment
thresholds, the air bags will not deploy. The
driver and passengers will then be protected
to the extent possible by a properly fastened
seat belt. A properly fastened seat belt is also
needed to provide the best possible
protection in a rollover.
Air bags provide additional protection; they
are not, however, a substitute for seat belts.
All vehicle occupants must fasten their seat
belts.
It is important for your safety and that of your
passengers to have deployed air bags
replaced and to have any malfunctioning air
bags repaired. This will help to make sure the
air bags continue to perform their protective
function for the vehicle occupants in the
event of a crash. Front air bags
Driver's air bag
:
deploys in front of the
steering wheel; front-passenger front air
bag ; deploys

in front of and above the glove
box.
The front air bags increase protection against
head and chest injuries.
They are deployed:
R in the event of certain frontal impacts
R if the system determines that air bag
deployment can offer additional protection
to that provided by the seat belt
R depending on whether the seat belt is being
used
R independently of other air bags in the
vehicle
If the vehicle rolls over, the front air bags are
generally not deployed. If the system detects
high vehicle deceleration in a longitudinal
direction, the front air bags are deployed.
Your vehicle has adaptive, two-stage front air
bags. In the event of a collision, the air bag
control unit evaluates the vehicle
deceleration. In the first deployment stage,
the front air bag is filled with enough
propellant gas to reduce the risk of injuries.
The front air bag is fully deployed if a second
deployment threshold is exceeded within a
few milliseconds.
The deployment of front-passenger front air
bag ; is also influenced by the weight
category of the front passenger, which is
determined by the Occupant Classification
System (OCS) ( Y page 43).40
Occupant safety
Safety

The lighter the passenger side occupant, the
higher the vehicle deceleration rate required
(predicted at the start of the impact) for
second-stage
inflation
of the front-passenger
front air bag. In the second stage, the front
air bags are inflated with the maximum
amount of propellant gas available.
The front air bags are not deployed in
situations where a low impact severity is
predicted. You will then be protected by the
fastened seat belt.
Front-passenger front air bag ; will only
deploy if:
R the system, based on the OCS weight
sensor readings, has detected that the
front-passenger seat is occupied.
R the ^a indicator lamp on the center
console is not lit, (Y page 43)
R the air bag control unit predicts a high
impact severity.
Knee bags The driver's knee bag
: deploys
underneath
the steering column and front-passenger
knee bag ; underneath the glove box. They
deploy together with the front air bags. They
are designed to operate together with the
front air bags in frontal impacts if certain
thresholds are exceeded. The knee bags
operate at best in conjunction with correctly
positioned and fastened seat belts. Knee bags provide increased protection for
the
driver

and front passenger against the risk
of:
R knee injuries
R thigh injuries
R lower leg injuries
Side impact air bags G
WARNING
The pressure sensors for side impact air bag
control are located in the doors. Do not
modify any components of the doors or door
trim panels including, for example, the
addition of door speakers.
Improper repair work on the doors or the
modification or

addition of components to the
doors create a risk of rendering the side
impact air bags inoperative or causing
unintended air bag deployment. Work on the
doors must therefore only be performed by
qualified technicians. Contact an authorized
Mercedes-Benz Center. G
WARNING
Only use seat covers which have been tested
and approved by Mercedes-Benz for your
vehicle model. Using other seat covers may
interfere with or prevent the deployment of
the side impact air bags. Contact an
authorized Mercedes-Benz Center for
availability. Example: side impact air bag on the driver's side
side impact air bags
: deploy next to the
outer side bolsters of the seat backrest. Occupant safety
41
Safety Z

Roll bar
G
DANGER
If the roll bar is malfunctioning, the
A Malfunction Service Required
message appears

in the multifunction display.
The roll bars will then possibly not be
extended in the event of an accident. This
could result in severe or even fatal injuries to
you and other occupants. In this case, visit a
qualified specialist workshop immediately
and have the roll bar checked. G
WARNING
If
you place objects or clothing on the roll bar
covers, these

could impair roll bar extension.
You and others could be injured by objects
being thrown around when the roll bars are
triggered.
Ensure that the area above the roll bar covers
is kept clear. Stow objects or clothing in a
secure place. The roll bars are located in the rear area of
the vehicle under the two outer rear
compartment trim covers.
The roll bars are extended automatically if
systems detect that the vehicle is in danger
of rolling over. The two rear compartment
trim covers are opened and the roll bars are
extended within fractions of a second.
Once the roll bars are extended, you can no
longer lower them. An open roof can no
longer
be

closed. In this case, visit the nearest
qualified specialist workshop. Occupant Classification System
(OCS)
Method of operation G
WARNING
If the 4
PASSENGER AIR BAG OFF
indicator lamp illuminates when an adult or
someone larger than a small individual is in
the front-passenger seat, have the front
passenger reposition

himself or herself in the
seat until the 4 PASSENGER AIR BAG OFF
indicator lamp goes out.
In the event of a collision, the air bag control
unit will not allow front-passenger front air
bag and front-passenger knee bag
deployment when the OCS has classified the
front-passenger occupant as weighing as
much as or less than a typical 12 month old
child in a standard child restraint or if the
front-passenger seat is classified as being
unoccupied.
When the OCS senses that the front-
passenger seat occupant is classified as
being up to or less than the weight of a typical
12-month-old child in a standard child
restraint, the 4 PASSENGER AIR BAG OFF
indicator lamp will illuminate when the engine
is started and remain illuminated. This
indicates that the front-passenger front air
bag and the front-passenger knee bag are
deactivated.
When the OCS senses that the front-
passenger seat is classified as being empty,
the 4 PASSENGER AIR BAG OFF indicator
lamp will illuminate when the engine is started
and remain illuminated. This indicates that
the front-passenger front air bag and the
front-passenger knee bag are deactivated.
When the OCS senses that the front-
passenger seat occupant is classified as
being heavier than the weight of a typical 12-
month-old child seated in a standard child
restraint or as being a small individual (such
as a young teenager or a small adult), the
4 PASSENGER AIR BAG OFF indicator
lamp will illuminate for approximately 6 Occupant safety
43Safety
Z

seconds when the engine is started.
Depending on occupant weight sensor
readings from the seat, it will then remain
illuminated
or
go out. If the 4 PASSENGER
AIR BAG OFF indicator lamp is illuminated, the
front-passenger front air bag and the front-
passenger knee bag are deactivated. If the
4 PASSENGER AIR BAG OFF indicator
lamp is not illuminated, the front-passenger
front air bag and the front-passenger knee
bag are activated.
When the OCS senses that the front-
passenger seat occupant is classified as an
adult or someone larger than a small
individual, the 4 PASSENGER AIR BAG
OFF indicator lamp will illuminate for
approximately six seconds when the engine is
started and then go out. This indicates that
the front-passenger front air bag and the
front-passenger knee bag are activated.
If the 4 PASSENGER AIR BAG OFF
indicator lamp is illuminated, the front-
passenger front air bag and the front-
passenger knee bag are deactivated and are
not deployed.
If the 4 PASSENGER AIR BAG OFF
indicator lamp is not illuminated, the front-
passenger front air bag and the front-
passenger knee bag are activated and are
deployed:
R in certain front impacts
R independently of the side impact air bag
and head bag
R if the impact has exceeded a
predetermined threshold value for
deployment
If the front-passenger front air bag is
deployed, the rate of inflation will be
influenced by:
R the rate of vehicle deceleration as assessed
by the air bag control unit
R the front passenger's weight category as
determined by the OCS G
WARNING
Children under 12 years must be secured
correctly in

a suitable infant or child restraint
system or booster seat suitable for the size
and weight of the child.
The infant or child restraint must be properly
secured with the vehicle's seat belt fully in
accordance with the child seat
manufacturer's instructions.
Occupants, in particular children, must sit as
upright as possible, fasten the seat belt
correctly and use a suitable infant restraint
system, child restraint system or booster seat
suitable for the size and weight of the child.
Children can be seriously or even fatally
injured by an air bag deploying.
Observe the following information:
R Your vehicle is equipped with air bag
technology designed to deactivate the
front-passenger front air bag and the front-
passenger knee bag in your vehicle when
the system senses the weight of a typical
12-month-old child or less along with the
weight of a standard appropriate child
restraint on the front-passenger seat.
R A child in a rear-facing child restraint
system on the front-passenger seat will be
seriously injured or even killed if the front-
passenger front air bag inflates in a collision
despite the air bag technology installed in
your vehicle, which could occur under some
circumstances.
R If you must install a rearward-facing child
restraint on the front-passenger seat, make
sure the 4 PASSENGER AIR BAG OFF
indicator lamp is illuminated, indicating
that the front-passenger front air bag and
front-passenger knee bag are deactivated.
If the 4 PASSENGER AIR BAG OFF
indicator lamp does not light up or goes out
when a rearward-facing child restraint
system is installed, please check
installation. Periodically check the 4
PASSENGER AIR BAG OFF indicator lamp
while driving to make sure the 444
Occupant safety
Safety

PASSENGER AIR BAG OFF indicator lamp is
illuminated. If the 4 PASSENGER AIR
BAG OFF indicator lamp goes out or
remains out do not carry a child on the
front-passenger seat.
R A child in a rearward-facing child restraint
system on the front-passenger seat will be
seriously injured or even killed if the front-
passenger air bag is deployed.
R When securing a child in a child restraint
system on the front-passenger seat, you
must:
-move the front-passenger seat as far
back as possible
- use a child restraint system that is
suitable for the age, size and weight of
the child
- observe the manufacturer's installation
instructions in

order to install and secure
the child restraint system correctly.
R For children larger than the typical 12-
month-old child, the front-passenger front
air bag may or may not be activated. G
WARNING
If the red
6 SRS warning lamp in the
instrument cluster

and the 4 PASSENGER
AIR BAG OFF indicator lamp light up
simultaneously, the OCS is malfunctioning.
The front-passenger front air bag and the
front-passenger knee bag will be deactivated
in this case. Have the system checked as soon
as possible by qualified technicians. Consult
an authorized Mercedes-Benz Center.
Only have the seat repaired at an authorized
Mercedes-Benz Center.
In order to ensure correct operation of the air
bag system and OCS:
R sit with the seat belt fastened correctly and
in a position that is as upright as possible
with your back against the backrest.
R while seated, an occupant should not
position themselves in such a way as to
cause their weight to be lifted from the seat
cushion as this may result in OCS being unable to correctly assess the occupant's
weight category.
R read and observe all warnings in this
section. If
the key has been removed from the ignition
lock or is in position 0, the ^a
indicator lamp : does not light up.
The ^_ indicator lamp ; is
inoperative. It lights up briefly when the
ignition is switched on and then goes out
again.
The Occupant Classification System (OCS)
categorizes the occupant on the front-
passenger seat using a weight sensor. The
front-passenger front air bag and the front-
passenger knee bag are deactivated
automatically for certain weight categories.
The ^a indicator lamp : shows you
the current

status. If the ^a indicator
lamp : lights up, the front-passenger air bag
and the front-passenger knee bag are
disabled.
The system does not deactivate:
R the side impact air bag
R the front-passenger head bag
R the Emergency Tensioning Devices
To be classified correctly, the front passenger
must sit:
R with the seat belt fastened correctly
R in a position that is as upright as possible
with their back against the seat backrest
R with their feet on the floor Occupant safety
45
Safety Z

The OCS weight sensor reading is affected if
the occupant's weight is transferred, e.g. by
leaning on the armrest.
If
the
front-passenger seat, the seat cover or
the seat cushion are damaged, have the
necessary repair work carried out at a
qualified specialist workshop.
Mercedes-Benz recommends that you only
use seat accessories which have been
approved by Mercedes-Benz.
Both the driver and the front passenger
should observe the ^a indicator
lamp : to determine whether or not the front
passenger is positioned correctly.
If the driver's air bag deploys, this does not
mean that the front-passenger front air bag
will also deploy.
The OCS may have detected that the seat:
R is empty or occupied by the weight of a
typical child up to twelve months old,
seated in a child restraint system
R is occupied by a small individual, such as a
young teenager or a small adult
R is occupied by a child in a child restraint
system whose weight is greater than that
of a typical twelve month old child.
These are examples of when the OCS
deactivates the front-passenger front air bag
and front-passenger knee bag. Deactivation
takes place although the collision fulfills the
criteria for deploying the driver's air bag.
System self-test G
WARNING
If the 4 PASSENGER AIR BAG OFF
indicator lamp

does not illuminate, the system
is not functioning. Consult an authorized
Mercedes-Benz Center before seating a child
on the front-passenger seat. G
WARNING
Never place anything between seat cushion
and child

seat (e.g. a pillow), since it reduces
the effectiveness of the OCS. The underside and rear side child restraint system must be
placed entirely on the seat cushion and the
backrest of the front-passenger seat
backrest.
If necessary, adjust the tilt of the passenger
seat backrest.
An
incorrectly

mounted child seat could cause
injuries to the child in case of an accident,
instead of increasing protection for the child.
Follow the manufacturer's instructions for
installation of child restraint systems.
The ^a indicator lamp lights up:
R if you turn the SmartKey in the ignition lock
to position 1 or 2
R if you press the KEYLESS-GO Start/Stop
button once or twice on vehicles with
KEYLESS-GO
R if an adult is seated properly on the front-
passenger seat and the OCS classifies the
occupant as an adult
The ^a indicator lamp goes out after
approximately 6 seconds.
If the seat is not occupied and the OCS
detects that the front-passenger seat is
empty, the ^a indicator lamp will
continue to light up. The ^a front-
passenger front air bag warning lamp then
stays lit continuously.
For more information about the OCS, see
"Problems with the Occupant Classification
System" ( Y page 47).46
Occupant safety
Safety