MERCEDES-BENZ S-CLASS COUPE 2014 Repair Manual

injuries. The front airbag is fully deployed if
the second deployment stage is activated
within a few milliseconds.
The activation threshold for the seat belt ten-
sioners and airbags is determined based on
the evaluation of the vehicle's rate of decel-
eration or acceleration at various points in the vehicle. This process is pre-emptive in nature.The triggering/deployment process should
take place in good time at the start of the
collision.
The rate of vehicle deceleration or accelera-
tion and the direction of the force are essen-
tially determined by:
R the distribution of forces during the colli-
sion
R the collision angle
R the deformation characteristics of the vehi-
cle
R the characteristics of the object with which
the vehicle has collided
Factors which can only be seen and measured
after a collision has occurred do not play a
decisive role in the deployment of an airbag,
nor do they provide an indication of airbag
deployment.
The vehicle may be deformed significantly
without an airbag being deployed. This is the
case if only parts which are relatively easily
deformed are affected and the rate of decel-
eration is not high. Conversely, an airbag may be deployed even though the vehicle suffers
only minor deformation. This is the case if, for
example, very rigid vehicle parts such as lon-
gitudinal body members are hit, and sufficient deceleration occurs as a result. If the restraint system control unit detects a
side impact or if the vehicle overturns, the
applicable components of the restraint sys-
tem are activated independently of each
other depending on the apparent type of acci-
dent. If the system determines that, in this
situation, triggering can offer additional pro-
tection, the seat belt tensioners are also trig-
gered.
R Sidebags on the side on which an impact
occurs, independent from the seat belt ten-
sioner and seat belt usage
Vehicles with the automatic front-
passenger front airbag deactivation sys-
tem: the sidebag on the front-passenger
side (front) deploys under the following
conditions:
- an occupant is detected on the front-
passenger seat or
- the belt tongue is engaged in the belt
buckle of the front-passenger seat
R Windowbag on the side on which an impact
occurs, independent of seat belt usage and
regardless of whether the front-passenger
seat is occupied
R Windowbags on the driver's and front-
passenger side in certain situations if the
vehicle overturns and if the system deter-
mines that deployment can offer additional protection to that provided by the seat belt
i Not all airbags are deployed in an acci-
dent. The different airbag systems work
independently of each other.
How the airbag system works is deter-
mined by the severity of the accident detec-
ted, especially the vehicle deceleration or
acceleration, and the apparent type of acci- dent:
R frontal collision
R side impact
R overturn 58
Occupant safetySafety

PRE-SAFE
®
(anticipatory occupant
protection)
Introduction In certain hazardous situations, PRE-SAFE
®
takes pre-emptive measures to protect the
vehicle occupants.
Important safety notes !
Make sure that there are no objects in the
footwell under or behind the seats when
moving the seats back. There is a risk that
the seats and/or the objects could be dam-
aged.
Although your vehicle is equipped with a PRE-
SAFE ®
system, the possibility of injury in the
event of an accident cannot be ruled out.
Always adapt your driving style to suit the
prevailing road and weather conditions and
maintain a safe distance from the vehicle in
front. Drive carefully.
Function PRE-SAFE
®
intervenes:
R in emergency braking situations, e.g. when
BAS is activated
R in critical driving situations, e.g. when phys-
ical limits are exceeded and the vehicle
understeers or oversteers severely
R vehicles with the Driving Assistance pack-
age: when a driver assistance system inter-
venes powerfully or the radar sensor sys-
tem detects an imminent danger of colli-
sion in certain situations
PRE-SAFE ®
takes the following measures
depending on the hazardous situation detec-
ted:
R the front seat belts are pre-tensioned.
R if the vehicle skids, the side windows are
closed so that only a small gap remains. R
the front-passenger seat is adjusted if it is
in an unfavourable position.
R vehicles with a multicontour seat: the air
pressure in the side bolsters of the back-
rest is increased.
If the hazardous situation passes without
resulting in an accident, PRE-SAFE ®
slackens
the belt pre-tensioning. On vehicles with mul-
ticontour seats, the air pressure in the side
bolsters is reduced again. All settings made
by PRE-SAFE ®
can then be reversed.
If the seat belt pre-tensioning is not reduced:
X Move the seat backrest or seat back
slightly when the vehicle is stationary.
Seat belt pre-tensioning is reduced and the locking mechanism is released.
The seat-belt adjustment is an integral part of
the PRE-SAFE ®
convenience function. Infor-
mation about the convenience function can
be found under "Belt adjustment"
(Y page 47). PRE-SAFE
®
PLUS (anticipatory occu-
pant protection PLUS)
Introduction PRE-SAFE
®
PLUS is only available in vehicles
with the Driving Assistance package.
Using the radar sensor system, PRE-SAFE ®
PLUS is able to detect that a head-on or rear-
end collision is imminent. In certain hazard-
ous situations, PRE-SAFE ®
PLUS takes pre-
emptive measures to protect the vehicle
occupants.
Important safety notes The intervention of PRE-SAFE
®
PLUS cannot
prevent an imminent collision.
The driver is not warned when PRE-SAFE ®
PLUS intervenes.
PRE-SAFE ®
PLUS does not intervene when
reversing. Occupant safety
59Safety Z

PRE-SAFE
®
PLUS does not perform braking
actions while the vehicle is in motion or when
Parking Guidance is active.
Function PRE-SAFE
®
PLUS intervenes in certain situa-
tions if the radar sensor system detects an
imminent head-on or rear-end collision.
PRE-SAFE ®
PLUS takes the following meas-
ures depending on the hazardous situation
detected:
R If the radar sensor system detects that a
head-on collision is imminent, the seat
belts are pre-tensioned.
R If the radar sensor system detects that a
rear-end collision is imminent:
- the rear hazard warning lamps are acti-
vated and flash at a higher frequency.
- the brake pressure is increased if the
driver applies the brakes when the vehi-
cle is stationary.
- the seat belts are pre-tensioned.
The PRE-SAFE ®
PLUS braking application is
cancelled:
R if the accelerator pedal is depressed when
a gear is engaged
R if the risk of a collision passes or is no lon-
ger detected
R if DISTRONIC PLUS indicates an intention
to pull away
If the hazardous situation passes without
resulting in an accident, the original settings
are restored. Automatic measures after an acci-
dent
Immediately after an accident, the following
measures are implemented, depending on
the type and severity of the impact:
R the hazard warning lamps are activated
R the emergency lighting is activated
R the vehicle doors are unlocked R
the front side windows are lowered
R the electrically adjustable steering wheel is
raised
R the engine is switched off
R vehicles with the Mercedes-Benz emer-
gency call system: automatic emergency
call Children in the vehicle
Important safety notes
Accident statistics show that children
secured in the rear seats are safer than chil-
dren secured in the front-passenger seat. For this reason, Mercedes-Benz strongly advises
that you install a child restraint system on a
rear seat. Children are generally better pro-
tected there.
If a child younger than 12 years old and under
1.50 m in height is travelling in the vehicle:
R always secure the child in a child restraint
system suitable for Mercedes-Benz vehi-
cles. The child restraint system must be
appropriate to the age, weight and size of
the child.
R be sure to observe the instructions and
safety notes in this section in addition to
the child restraint system manufacturer's
installation instructions
R be sure to observe the instructions and
safety notes on the automatic front-
passenger front airbag deactivation system
(Y page 51). G
WARNING
If you leave children unattended in the vehi-
cle, they may be able to set the vehicle in
motion if, for example, they:
R release the parking brake
R shift the automatic transmission out of park
position P
R start the engine 60
Children in the vehicleSafety

In addition, they may operate vehicle equip-
ment and become trapped. There is a risk of
an accident and injury.
When leaving the vehicle, always take the key with you and lock the vehicle. Never leave
children unattended in the vehicle. G
WARNING
If persons (particularly children) are exposed
to heat or cold for a prolonged period, there is a risk of serious or even fatal injuries. Never
leave persons (particularly children) unatten-
ded in the vehicle. G
WARNING
If the child restraint system is placed in direct sunlight, the parts could become very hot.
Children could be suffer burns by touching
these parts, in particular on the metallic parts
of the child restraint system. There is a risk of injury.
If you and your child leave the vehicle, always
make sure that the child restraint system is
not in direct sunlight. Cover it with a blanket, for example. If the child restraint system has
been exposed to direct sunlight, leave it to
cool down before securing the child in it.
Never leave children unattended in the vehi-
cle.
Make sure that all vehicle occupants are
seated properly with a correctly fastened seat
belt. This applies particularly to children.
Observe the safety notes on the seat belt
(Y page 44) and the information on the cor-
rect use of the seat belt (Y page 45).Child restraint system
Observe the instructions for correct use of
the child restraint system (Y page 65).
For safety reasons, Mercedes-Benz recom-
mends that you only use a child restraint sys- tem recommended by Mercedes-Benz
(Y page 67). G
WARNING
If the child restraint system is incorrectly fit-
ted on the seat position suitable for this pur-
pose, it cannot perform its intended protec-
tive function. In the event of an accident,
sharp braking or a sudden change in direction, the child may not be held securely. There is an
increased risk of serious or even fatal injuries.
Observe the manufacturer's installation
instructions and the correct use for the child
restraint system. Make sure that the entire
surface of the child restraint system is resting
on the seat surface. Never place objects
under or behind the child restraint system,
e.g. cushions. Only use child restraint sys-
tems with the original cover designed for
them. Only replace damaged covers with gen- uine covers. G
WARNING
If the child restraint system is fitted incor-
rectly or is not secured, it can come loose in
the event of an accident, heavy braking or a
sudden change in direction. The child
restraint system could be thrown about, strik- ing vehicle occupants. There is an increased
risk of injury, possibly even fatal.
Always fit child restraint systems properly,
even if they are not being used. Make sure
that you observe the child restraint system
manufacturer's installation instructions.
You will find further information on stowing
objects, luggage and loads securely under
"Loading guidelines" (Y page 314). G
WARNING
Child restraint systems or their securing sys-
tems that have been damaged or subjected to a load in an accident cannot perform their
intended protective function. In the event of
an accident, sharp braking or a sudden
change in direction, the child may not be held securely. There is an increased risk of serious
or even fatal injuries.
Immediately replace child restraint systems
that have been damaged or subjected to a Children in the vehicle
61Safety
Z

load in an accident. Have the child restraint
securing systems checked in a qualified spe-
cialist workshop before fitting a child restraint
system again.
If it is absolutely necessary to carry a child on
the front-passenger seat, be sure to observe
the information on "Child restraint systems
on the front-passenger seat" (Y page 63).
Observe the warning labels in the vehicle inte-
rior and on the child restraint system.
i It is advisable to use Mercedes-Benz care
products to clean child restraint systems
recommended by Mercedes-Benz. You can obtain information about this at any
Mercedes-Benz Service Centre. ISOFIX child seat securing system
G
WARNING
ISOFIX child restraint systems do not offer
sufficient protective effect for children whose weight is greater than 22 kg who are securedusing the safety belt integrated in the child
restraint system. The child could, for example,not be restrained correctly in the event of an
accident. This poses an increased risk of
injury or even fatal injury.
If the child weighs more than 22 kg, only use
ISOFIX child restraint systems with which the child is also secured with the vehicle seat belt. Also secure the child restraint system with the
Top Tether belt, if available.
When fitting a child restraint system, be sure to observe the manufacturer's installation
instructions and the instructions for correct
use of the child restraint system
(Y page 65).
Before every trip, make sure that the ISOFIX
child restraint system is engaged correctly in both ISOFIX securing rings. ISOFIX securing rings
;on the rear seats are
covered by folding upholstered lining =with
Velcro fastening.
X Fold upholstered lining =upwards.
X Turn support :by 90°.
Upholstered lining =remains folded
upwards.
X Install the ISOFIX child restraint system on
both ISOFIX securing rings ;.
After you have removed the ISOFIX child
restraint system, you must turn support :on
upholstered lining =by 90° again. Then fold
upholstery lining =down.
ISOFIX is a standardised securing system for
specially designed child restraint systems on
the rear seats. ISOFIX securing rings ;for
two ISOFIX child restraint systems are fitted
on the left and right of the rear seats.
Secure child restraint systems without an
ISOFIX child seat securing system using the
seat belts in the vehicle. When fitting a child
restraint system, be sure to observe the man- ufacturer's installation and operating instruc-
tions and the instructions for correct use of
the child restraint system (Y page 65). Top Tether
Introduction Top Tether provides an additional connection
between the child restraint system secured
with ISOFIX and the vehicle. It helps reduce
the risk of injury even further. If the child 62
Children in the vehicleSafety

restraint system is fitted with a Top Tether
belt, this should always be used.
Top Tether anchorages The Top Tether anchorage points are fitted in
the rear compartment behind the head
restraints on the parcel shelf. X
Move head restraint :upwards.
X Fold up cover ;of Top Tether anchorage
=.
X Fit the ISOFIX child restraint system with
Top Tether. Always comply with the child
restraint system manufacturer's installa-
tion instructions when doing so.
X Route Top Tether belt Aunder head
restraint :between the two head restraint
bars.
X Hook Top Tether hook ?of Top Tether belt
A into Top Tether anchorage =.
Make sure that Top Tether belt Ais not
twisted.
X Tension Top Tether belt A. Always comply
with the child restraint system manufactur- er's installation instructions when doing so. X
Fold down cover ;of Top Tether anchor-
age =.
X If necessary, move head restraint :back
down again slightly (Y page 110). Make
sure that you do not interfere with the cor-
rect routing of Top Tether belt A. Child restraint system on the front-
passenger seat
General notes Accident statistics show that children
secured in the rear seats are safer than chil-
dren secured in the front-passenger seat. For
this reason, Mercedes-Benz strongly advises
that you install a child restraint system on a
rear seat.
Vehicles with the automatic front-passenger
front airbag deactivation system: if it is abso- lutely necessary to fit a child restraint system
to the front-passenger seat, always observe
the information on "Automatic front-
passenger front airbag deactivation system"
(Y page 51).
You can thus avoid the risks that could arise
as a result of:
R a child restraint system that is not detected
by the automatic front-passenger front air- bag deactivation system
R the unintentional disabling of the front-
passenger front airbag
R the unsuitable positioning of the child
restraint system, e.g. too close to the dash-
board Children in the vehicle
63Safety Z

Please observe the warning notice on the
front-passenger sun visor, see the illustra-
tion. G
WARNING
If you secure a child on the co-driver's seat in a rearward-facing child restraint system and
the PASSENGER AIR BAG ON indicator lamp
lights up, the co-driver's airbag could be
deployed in the event of an accident. The childcould be struck by the airbag. There is an
increased risk of injury, possibly even fatal.
In this case, always ensure that the co-driver's
airbag is disabled. The PASSENGER AIRBAG
OFF indicator lamp must light up.
NEVER use a rearward facing child restraint
on a seat protected by an ACTIVE AIRBAG in
front of it, DEATH or SERIOUS INJURY to the
CHILD can occur.
If the PASSENGER AIR BAG ON indicator lamp
is lit, the front-passenger front airbag is ena-
bled (Y page 43).
Vehicles without the automatic front-
passenger front airbag deactivation
system If the front-passenger seat of your vehicle is
not equipped with the automatic front-
passenger front airbag deactivation system,
this is indicated by a special sticker. The
sticker is affixed to the side of the dashboard
on the front-passenger side. The sticker is
visible when you open the front-passenger
door. In this case, always fit the rearward-facing
child restraint system to a suitable rear seat
(Y
page 65).
Observe the following information under
"Rearward-facing child restraint system" and
"Forward-facing child restraint system" as
well as information on the suitable position-
ing of the child restraint system
(Y page 65).
Rearward-facing child restraint system If it is absolutely necessary to fit a rearward-
facing child restraint system to the front-
passenger seat, always make sure that the
front-passenger front airbag is disabled. Only
if the PASSENGER AIR BAG OFF indicator
lamp is permanently lit (Y page 43)is the
front-passenger front airbag disabled.
Always observe the information on suitable
positioning of the child restraint system
(Y page 65) in addition to the child restraint
system manufacturer's installation and oper-
ating instructions.
Forward-facing child restraint system If you secure a child in a forward-facing child
restraint system on the front-passenger seat,
always move the front-passenger seat as far
back as possible. Fully retract the seat cush-
ion length. The entire base of the child
restraint system must always rest on the seat cushion of the front-passenger seat. The
backrest of the child restraint system must,
as far as possible, lie flat against the backrest
of the front-passenger seat. The child
restraint system must not touch the roof or be
put under strain by the head restraint. Adjust the angle of the seat backrest and the head
restraint position accordingly. Always make
sure that the shoulder belt strap is correctly
routed from the front-passenger seat-belt
extender to the shoulder belt guide on the
child restraint system. The shoulder belt strap
must be routed forwards from the retracted
seat-belt extender for the front-passenger
seat. 64
Children in the vehicleSafety

Always observe the information on suitable
positioning of the child restraint system
(Y page 65) in addition to the child restraint
system manufacturer's installation and oper- ating instructions. Suitable positioning of the child
restraint system
Introduction Only child restraint systems which are
approved in accordance with the ECE stand-
ard ECE R44 are permitted for use in the vehi-
cle.
For certain child restraint systems in weight
categories II or III, this can mean that the area of use is restricted. The maximum size setting
of the child restraint system is not possible
due to possible contact with the roof.
"Universal" category child restraint systems
can be recognised by their orange approval
label and the text "Universal". Example: approval label on the child restraint sys-
tem
"Universal" category child restraint systems
can be used on the seats indicated with U, UF
or IUF according to the tables "Suitability of
the seats for attaching belt-secured child
restraint systems" or "Suitability of the seats
for attaching an ISOFIX child restraint sys-
tem".
Semi-universal child restraint systems are
indicated by the text "Semi-universal" on the
approval label. These can be used if the vehi- cle and the seat are listed in the child restraint system manufacturer's vehicle model list. For
more information, contact the child restraint
system manufacturer or visit their website.
Child restraint system on the front-
passenger seat – if it is absolutely necessary
to secure a child in a child restraint system on the front-passenger seat:
X Always pay attention to the instructions
under "Child restraint system on the front-
passenger seat" (Y page 63).
There you will find instructions on how to
correctly route the shoulder belt strap from the vehicle seat-belt extender or belt sash
guide to the shoulder belt guide on the child
restraint system (Y page 64).
X Move the front-passenger seat as far back
as possible and fully retract the seat cush-
ion length.
If you secure a child in a forward-facing
child restraint system on the front-
passenger seat, also move the front-
passenger seat to the lowest position.
X Move the backrest to an almost vertical
position.
The entire base of the child restraint sys-
tem must always rest on the seat cushion of
the front-passenger seat. The backrest of
the forwards-facing child restraint system
must, as far as possible, be resting on the
backrest of the front-passenger seat. The
child restraint system must not touch the
roof or be put under strain by the head
restraint. Adjust the angle of the seat back- rest and the head restraint position accord-
ingly. Also observe the child restraint sys-
tem manufacturer's installation instruc-
tions.
X Move the seat cushion angle to the highest,
most vertical position.
Suitability of the seats for attaching
belt-secured child restraint systems If you use a baby car seat of category 0 or 0+
or a rearward-facing child restraint system of
category I on a rear seat, you must adjust the Children in the vehicle
65Safety Z

driver's or front-passenger seat so that the
seat does not touch the child restraint sys-
tem.
Legend for the table:
XS eat which is unsuitable for children in
this weight category
US uitable for child restraint systems in the
"Universal" category that are approved
for use in this weight category
UF Suitable for forward-facing child restraint systems that belong to the "Uni-
versal" category and are approved for
use in this weight category
LS uitable for child restraint systems as
recommended; see the table "Recom-
mended child restraint systems"
(Y page 67). Suitable for semi-univer-
sal child restraint systems if the vehicle
and the seat are listed in the child
restraint system manufacturer's vehicle
model list.
(▲) The vehicle is equipped with automatic front-passenger front airbag deactiva-
tion. The PASSENGER AIR BAG OFF indi- cator lamp must be lit.
Front-passenger seat Weight cat-
egories Front-
passenger
front air-
bag is ena-
bled. Front-
passenger
front air-
bag is disa-
bled. (▲)
Category 0:
up to 10 kg X U, L
Category
0+: up to
13 kg
X U, L
Category I:
9 to 18 kg
UF, L U, L Weight cat-
egories Front-
passenger
front air-
bag is ena-
bled. Front-
passenger
front air-
bag is disa-
bled. (▲)
Category II:
15 to 25 kg UF, L U, L
Category
III: 22 to
36 kg
UF, L U, L
Rear seats
Weight categories Left, right
Category 0: up to
10 kg
U
Category 0+: up to
13 kg U
Category I: 9 to
18 kg
U
Category II: 15 to
25 kg
U
Category III: 22 to
36 kg
U
Suitability of the seats for attaching
ISOFIX child restraint systems
If you use a baby car seat of category 0 or 0+
or a rearward-facing child restraint system of
category I on a rear seat, you must adjust the
driver's or front-passenger seat so that the
seat does not touch the child restraint sys-
tem.
Legend for the table:
XI SOFIX position that is not suitable for
ISOFIX child restraint systems in this
weight category and/or size category.
IUF Suitable for forward-facing ISOFIX child seat securing systems that belong to the"universal" category which are approved
for use in this weight category. 66
Children in the vehicleSafety

IL Suitable for ISOFIX child restraint sys-
tems as recommended; see the follow-
ing table of "Recommended child
restraint systems" (Y page 67).
The manufacturer will also recommend a suitable ISOFIX child restraint system.
For this, your vehicle and the seat must
be listed in the child restraint system
manufacturer's model list. For more
information, contact the child restraint
system manufacturer or visit their web-
site.
(♦) If you are using a child restraint system of size category C (ISO/R3), move the
front seat to the highest position and thefront-seat backrest to an upright posi-
tion. Make sure that the seat backrest ofthe front seat does not rest against the
child restraint system.
Carry-cot weight category Size cate-
gory Equipment Rear seat,
left and right
F ISO/L1 X
G ISO/L2 X
Weight category 0: up to 10 kg, up to
approximately 6 months Size cate-
gory Equipment Rear seat,
left and
right
E ISO/R1 IL
Weight category 0+: up to 13 kg, up to
approximately 15 months
Size cate-
gory Equipment Rear seat,
left and
right
E ISO/R1 IL
D ISO/R2 IL
C ISO/R3 IL (♦) Weight category I: 9 to 18 kg, approx-
imately 9 months to 4 years
Size cate-
gory Equipment Rear seat,
left and
right
D ISO/R2 IL
C ISO/R3 IL (♦)
B ISO/F2 IUF
B1 ISO/F2X IUF
A ISO/F3 IUF
The child restraint system must not touch the
roof or be put under strain by the head
restraint. Adjust the head restraint position
accordingly. Also observe the child restraint
system manufacturer's installation instruc-
tions. Recommended child restraint sys-
tems
General notes Always observe the information in "Child
restraint systems on the front-passenger
seat" (Y
page 63) and in "Suitable positioning
of the child restraint system" (Y page 65).
You can obtain further information about the correct child restraint system from any
Mercedes-Benz Service Centre.
Recommended child restraint systems
for attaching with the vehicle seat belt Weight category 0: up to 10 kg; up to
approximately 6 months
Manufac-
turer
Britax Römer Britax Römer
Type
BABY SAFE
plus BABY SAFE
plus IIChildren in the vehicle
67Safety Z