2012 MERCEDES-BENZ C-CLASS SALOON ECU

&
WARNING Risk of accident due tocon‐
necting devices tothe diagnostics con‐
nection
If yo u connect devices tothe diagnostics
connection of theve hicle, the function of
ve hicle sy stems and operating saf ety may be
impaired. #
For saf etyre asons, werecommend that
yo u on lyuse and connect products
appr ovedby yo ur Mercedes-Benz
service centre. &
WARNING Risk of accident due to
objects in the driver's foot we ll
Objects in the driver's foot we ll may impede
pedal tr avel or block a depressed pedal.
This jeopardises the operating and road
saf ety of theve hicle. #
Stow all objects in theve hicle securely
so that they cannot getinto the driver's
fo ot we ll. #
Alw aysfit th efloor mats securely and
as prescribed in order toensure that th
ere is alw ays suf ficient room forthe
pedals. #
Do not use loose floor mats and do not
place floor mats on top of one ano ther. *
NO
TEBattery discharging from using
devices connected tothe diagnostics
connection Using devices at
the diagnostics connection
drains the batter y. #
Check thech arge leve l of the batter y. #
Ifth ech arge leve l is lo w,charge the
batter y,e.g. bydriving a considerable
dis tance. Connecting and using ano
ther device with the
diagnostics connection can ha vethefo llowing
ef fects:
R malfunctions in theve hicle sy stem
R permanent damage tovehicle components
Please referto thewa rranty term s and condi‐
tions forth is matter. 30
General no tes
Internal use only

ve
hicle's own transmitter and recei ver or by a
mobile end device that you ha vebrought into the
ve hicle, forex ample, a smartphone. Online func‐
tions can be used via the wireless network con‐
nection. This includes online services and appli‐
cations/apps pr ovided to yo uby the manufac‐
turer or by other pr oviders.
Manu factu rer's se rvices
Re garding the manufacturer's online services,
th e individual functions are described bythe
manufacturer in a suita ble place,forex ample, in
th e Owner's Manual or on the manufacturer's
we bsite, where there leva nt da taprotection
information is also given. Personal data may be
used forth e pr ovision of online services. Data
are exchanged via a secure connection, such as
th e manufacturer's designated IT sy stems. Any
personal data which are collected, processed
and used, other than forth e pr ovision of serv‐
ices, is done so exclusively on the basis of legal
permission. This is the case, forex ample, for a
legally prescribed emergency call sy stem, a con‐
tractual agreement or when consent has been
given. Yo
u can ha veservices and functions, some of
which are subject toafe e, activated or deactiva‐
te d. This excludes legally prescribed functions
and services, such as an emer gency call sy stem.
Third party services
If yo u use online services from other pr oviders
(third parties), these services are there sponsi‐
bility of the pr ovider in question and subject to
th at pr ovider's data pr otection conditions and
te rm s of use. As a general rule, the manufac‐
turer has no influence on the conte nt
exc hanged.
Fo rth is reason, when services are pr ovided by
th ird parties, please ask the service pr ovider in
qu estion for information about the type, extent
and pu rpose of the collection and use of per‐
sonal data. Data pr
otection rights Depending on
your count ryor the equipment
and range of functions of your vehicle as well as
th e services you use and the services on of fer,
yo u are entitled todiffere nt da taprotection
ri ghts. Further information on data pr otection and
your data pr otection rights can either be
fo und on the manufacturer's website or you will
re cei vethis information as part of theva rious
services and service of fers . The reyou will also
fi nd the conta ct information forth e manufac‐
turer and its data pr otection of ficers.
At awo rkshop, forex ample, with the support of
a specialist and possibly for a fee, you can ha ve
data read out which is stored only locally in the
ve hicle. Copyright
Information on licences for free and open-sou rce
software used in your vehicle can be found on
th e data car rier in your vehicle document wallet
and with updates on thefo llowing website:
https://www.mercedes-benz.com/opensource 36
General no tes
Internal use only

Re
stra int sy stem Pr
otection pr ovided bythere stra int sy stem The
restra int sy stem includes thefo llowing com‐
ponents:
R Seat belt sy stem
R Airbags
R Child restra int sy stem
R Child seat securing sy stems
The restra int sy stem can help pr eventtheve hi‐
cle occupants from coming into contact with
parts of theve hicle interior in theev ent of an
accident. In theev ent of an accident, the
re stra int sy stem can also reduce thefo rc es to
which theve hicle occupants are subjected.
A seat belt can only pr ovide the best le vel of pro‐
te ction if it is worncor rectl y.Depending on the
de tected accident situation, seat belt tensioners
and/or airbags supplement the pr otection
of fere dby a cor rectly wornseat belt. Seat belt
te nsioners and/or airbags are not depl oyed in
eve ryaccident. In order
forth ere stra int sy stem toprov ide the
intended le vel of pr otection, each vehicle occu‐
pant must obser vethefo llowing information:
R Fasten seat belts cor rectl y.
R Sit in an almost upri ght seat position with
th eir back against the seat backrest.
R Sit with their feet resting on thefloor, if pos‐
sible.
R Alw ays secure persons under 1.50 m tall in
an additional restra int sy stem suitable for
Mercedes-Benz vehicles.
Ho wever,no sy stem available today can com‐
ple tely elimin ate injuries and fata lities in every
accident situation. In particular, the seat belt
and airbag generally do not pr otect against
objects penetrating theve hicle from the outside.
It is also not possible tocompl etely rule out the
ri sk of injury caused bythe airbag deploying. Re
duced restra int sy stem pr otection &
WARNING Risk of injury or death dueto
modifications tothere stra int sy stem
Ve hicle occupants may no longer be pr otec‐
te d as intended if alterations are made tothe
re stra int sy stem. #
Never alter the parts of there stra int
sy stem. #
Neverta mp er with the wiring or any
electronic component parts or their
software. If it is necessary
tomodify theve hicle toaccom‐
modate a person with disabilities, con tact a
qu alified specialist workshop.
Mercedes-Benz recommends that you use driv‐
ing aids which ha vebeen appr ovedfo ryo ur vehi‐
cle byMercedes-Benz. Re
stra int sy stem functionality When
the ignition is switched on, a self-test is
per form ed, during which the6 restra int sys‐ Occupant saf
ety37
Internal use only

R
The seat belt must be routed across the
centre of the shoulder and as low down
across the hips as possible.
R The shoulder section of the seat belt should
not touch your ne cknor be routed under
yo ur arm or behind your bac k.
R Avoid wearing bulky clo thing, e.g. a winter
coat.
R Push the lap belt down as far as possible
across your hips and pull tight with the shoul‐
der section of the belt. Ne verro ute the lap
belt across your abdomen.
Pregnant women must also take particular
care with this.
R Neverro ute the seat belt across sharp, poin‐
te d, abrasive or fragile objects.
R Only one person should use each seat belt at
any one time. Ne ver allow babies and chil‐
dren totrave l sitting on the lap of ano ther
ve hicle occupant.
R Never secure objects with a seat belt if the
seat belt is also being used byone of the
ve hicle's occupants. Alw ays obser vethe
instructions for loading theve hicle when securing objects, luggage or loads
(/
page 111).
Also ensure that no objects, e.g. a cushion,
are ever placed between a person and the
seat.
If ch ildren are tra velling in theve hicle, be sure to
obser vethe instructions and saf ety no tes on
"Children in theve hicle" (/ page 53). Limitations of
the pr otection pr ovided bythe
seat belt &
WARNING Risk of injury or death dueto
incor rect seat position
The seat belt will not of ferth e intended le vel
of pr otection if you ha venot mo vedth e seat
backrest toan almost vertical position.
In particular, you may slip under the seatbelt
and injure yourself. #
Adjust the seat proper lybefore begin‐
ning your journe y. #
Alw ays ensure that the seat backrest is
in an almost vertical position and that th
e shoulder section of your seat belt is
ro uted across the cent reofyour shoul‐
der. &
WARNING Risk of injury or death when
additional restra int sy stems are not used
fo r persons with a smaller stature
Pe rsons under 1.50 m tall cannot wearthe
seat belt cor rectly wi thout a suitable addi‐
tional restra int sy stem. #
Alw ays secure persons under 1.50 m
ta ll in a suitable restra int sy stem. &
WARNING Risk of injury or death dueto
damaged or modified seat belts
Seat belts cannot prov ide pr otection in the
fo llowing situations:
R the seat belt is damaged, has been modi‐
fi ed, is extremely di rty, bleached or dyed
R the seat belt buckle is damaged or
ex treme lydirty 40
Occupant saf ety
Internal use only

Each
vehicle occupant must make sure of the
fo llowing:
R Fasten seat belts cor rectl y.Pregnant
wo men must take particular care to
ensure that the lap belt ne ver lies across
th e abdomen.
R Adopt the cor rect seat position and keep
as faraw ay as possible from the airbags.
R Obser vethefo llowing information. #
Alw ays make sure that there are no
objects between the airbag and vehicle
occupant. To
avo idtherisks resulting from the deployment
of an airbag, each vehicle occupant must
obser vethefo llowing information in particular:
R Before starting your journe y,adjust your seat
co rrectly; the driver's seat and front
passenger seat should be mo ved as far back
as possible.
When doing so, alw ays obser vethe informa‐
tion on the cor rect driver's seat position
(/ page 98). R
Only hold thesteering wheel bythesteering
wheel rim. This allows the airbag tobe fully
deplo yed.
R Alw ays lean against the seat backrest when
th eve hicle is in motion. Do not lean forw ards
or against the door or side windo w.You may
ot herwise be in the deployment area of the
airbags.
R The occupants must alw ayske ep their feet
on thefloor. Do not put your feet on the
cockpit, forex ample. Your feet may other‐
wise be in the deployment area of the airbag.
R Ifch ildren are tra velling in theve hicle,
obser vethe additional no tes (/ page 53).
R Alw aysstow and secure objects cor rectly.
Objects in theve hicle interior may pr event an
airbag from functioning cor rectly. Each vehicle
occupant must alw ays make sure of thefo llow‐
ing in particular:
R There are no people, animals or objects
between theve hicle occupants and an air‐
bag. R
There are no objects between the seat, door
and door pillar (B-pillar).
R There are no hard objects, e.g. coat hangers,
hanging on the grab handles or coat hooks.
R There are no accessory parts, such as mobile
navigation devices, mobile phones or cup
holders, within the deployment area of an air‐
bag, e.g. on the cockpit, on the door, on the
side window or on the side trim.
In addition, no connecting cables, tensioning
st ra ps or retaining stra ps must be routed or
attached totheve hicle within the deploy‐
ment area of an airbag. Alw ays comply with
th e accessory manufacturer's ins tallation
instructions and, in particular, the no tes on
suitable places for ins tallation.
R There are no heavy, sharp-edged or fragile
objects in the poc kets of your clo thing. Store
such objects in a suitable place. Occupant saf
ety45
Internal use only

Self-test of automatic front passenger airbag
shutoff
When
the ignition is switched on, a self-test is
per form ed during which the two PASSENGER
AIR BAG ON and OFF indicator lamps light up
simul taneously.
The status of the front passenger airbag is dis‐
pla yed via thePA SSENGER AIR BAG indicator
lamps af terth e self-tes t:
R ON is lit: the front passenger airbag may
deploy during an accident.
The indicator lamp goes out af ter appro x‐
ima tely 60 seconds.
R ON and OF F are not lit: the front passenger
airbag may deploy during an accident.
R OFF is lit: the front passenger airbag is disa‐
bled. It will then not be deplo yed in theev ent
of an accident.
If th ePA SSENGER AIR BAG ON indicator lamp is
off, on lythePA SSENGER AIR BAG OFF indicator
lamp sho ws thest atus of the front passenger
airbag. The PASSENGER AIR BAG OFF indicator
lamp may be lit continuously or be off. If
th ePA SSENGER AIR BAG OFF indicator lamp
and the6 restra int sy stem warning lamp
light up simultaneousl y,the front passenger seat
may not be used. Also in this case, do not fit a
ch ild restra int sy stem tothe front passenger
seat. Ha vethe automatic front passenger airbag
shutoff checked and repaired immediately at a
qu alified specialist workshop.
St atus display
If th e front passenger seat is occupied, ensure,
bo th before and during the journe y,that thest a‐
tus of the front passenger airbag is cor rect for
th e cur rent situation.
Af terfitting a rear wa rd-facing child restra int
sy stem tothe front passenger seat:
PA SSENGER AIR BAG OFF must be lit continu‐
ousl y. &
WARNING Risk of injury or death when
using a rear wa rd-facing child restra int
sy stem while the front passenger airbag
is enabled
If yo u secure a child in a rear wa rd-facing
ch ild restra int sy stem on the front passenger
seat and thePA SSENGER AIR BAG OFF indi‐
cator lamp is off, the front passenger airbag
can deploy in theev ent of an accident.
The child could be stru ck bythe airbag.
Alw ays ensure that the front passenger air‐
bag is disabled. The PASSENGER AIR BAG
OFF indicator lamp must be lit.
NEVER use a rear wa rd-facing child restra int
sy stem on a seat with an ENABLED FRONT
AIRB AG. This can result in the DEAT H of or
SERIOUS INJU RYtotheCH ILD. When
fitting a child restra int sy stem tothe front
passenger seat, obser vetheve hicle-specific
information (/ page 68).
Depending on thech ild restra int sy stem and the
st ature of thech ild, thePA SSENGER AIR BAG
OFF indicator lamp may be off. In this case, do Occupant saf
ety49
Internal use only

not
fit th ere ar wa rd-facing child restra int sy stem
to the front passenger seat.
Ins tead, fit th ere ar wa rd-facing child restra int
sy stem toa suitable rear seat.
Af terfitting a forw ard-facing child restra int
sy stem tothe front passenger seat: depend‐
ing on thech ild restra int sy stem and thest ature
of thech ild, PASSENGER AIR BAG OFF may be lit
continuously or be off. Alw ays obser vethefo l‐
lowing information. &
WARNING Risk of injury or death dueto
incor rect positioning of thefo rw ard-
fa cing child restra int sy stem
If yo u secure a child in a forw ard-facing child
re stra int sy stem on the front passenger seat
th at is positioned too close tothe cockpit, in
th eev ent of an accident, thech ild could:
R come into con tact with th eve hicle inte‐
ri or if thePA SSENGER AIR BAG OFF indi‐
cator lamp is lit, forex ample
R bestru ck bythe airbag if thePA SSENGER
AIR BAG OFF indicator lamp is off. #
Alw ays mo vethe front passenger seat
as far back as possible and fully retract
th e seat cushion length adjustment.
While doing so, alw ays make sure that
th e shoulder belt stra p is cor rectly
ro uted from the seat belt outlet of the
ve hicle tothe shoulder belt guide on
th ech ild restra int sy stem. The shoulder
belt stra p must be routed forw ards and
down wards from the seat belt outlet. If
necessar y,adjust the seat belt outlet
and the front passenger seat accord‐
ingly. #
Alw ays comply with thech ild restra int
sy stem manufacturer's ins tallation
instructions. When
fitting a child restra int sy stem tothe front
passenger seat, obser vetheve hicle-specific
information (/ page 68).
If a person is sitting on the front passenger
seat: PASSENGER AIR BAG OFF may be lit con‐
tinuously or be off, depending on the person's
st ature. A person on
the front passenger seat must
alw ays obser vethefo llowing information:
R Ifth e front passenger seat is occupied byan
adult or a person with a stature cor respond‐
ing tothat of an adult, thePA SSENGER AIR
BA G OFF indicator lamp must be off. This
indicates that the front passenger airbag is
enabled.
If th ePA SSENGER AIR BAG OFF indicator
lamp is lit continuousl y,an adult or person
with a build cor responding tothat of an adult
must not use the front passenger seat.
Ins tead, they should use a rear seat.
R Ifth e front passenger seat is occupied by a
person of smaller stature (e.g. a teenager or
small adult), thePA SSENGER AIR BAG OFF
indicator lamp is either lit continuously or
re mains off, depending on the classification.
- Ifth ePA SSENGER AIR BAG OFF indicator
lamp is off: mo vethe front passenger
seat as far back as possible, or the per‐
son of smaller stature should use a rear
seat. 50
Occupant saf ety
Internal use only

Yo
u will need toper form certain settings your‐
self. #
Ifth e seat belt pre-tensioning is not reduced,
mo vethe seat backrest back slightl y.
The locking mechanism releases. Fu
nction of PRE-SAFE ®
PLUS (anticipatory
occupant pr otection plus) PRE-
SAFE®
PLUS can de tect cer tain impacts,
particular lyan imminent rear impact, and take
pre-em ptive measures toprotect theve hicle
occupants. These measures cannot necessarily
pr eve nt an imminent impact.
PRE-SAFE ®
PLUS can implement thefo llowing
measures independently of each other:
R Tightening the seat belts on the driver's seat
and front passenger seat.
R Activating there ar hazard warning lights at a
higher flashing frequenc y.
R Increasing brake pressure when theve hicle
is stationar y.This brake application is cancel‐
led automatically when theve hicle pulls
aw ay. If an accident did not occur,
the pre-em ptive
measures that we retake n are reve rsed.
Sy stem limits
The sy stem will not initiate any action in thefo l‐
lowing situations:
R when reve rsing
or
R when theve hicle is towing a trailer and there
is a risk of a rear impact
The sy stem will not initiate any braking applica‐
tion in thefo llowing situations:
R whilst driving
or
R when entering or exiting a parking space
while using Active Parking Assist Safely transporting
children in theve hicle Alw
ays obser vewhen children are tr avelling
in theve hicle %
Also strictly obser vethe saf ety no tesfo rthe
specific situation. In this wa yyo u can recog‐ nise po
tential risks and avoid dangers if chil‐
dren are tr avelling in theve hicle
(/ page 53).
Be diligent
Bear in mind that negligence when securing a
ch ild in thech ild restra int sy stem may ha veseri‐
ous consequences. Alw ays be diligent in secur‐
ing a child carefully before everyjou rney.
To impr oveprotection forch ildren younger than
12 years old or under 1.50 m in height,
Mercedes-Benz recommends you obse rvethe
fo llowing information:
R Alw ays secure thech ild in a child restra int
sy stem suitable forth is Mercedes-Benz vehi‐
cle.
R The child restra int sy stem must be appropri‐
ate tothe age, weight and size of thech ild.
R The vehicle seat must be suitable forfitting a
ch ild restra int sy stem (/ page57).
Ac cident statistics show that children secured
on there ar seats are general lysafer than chil‐
dren secured on the front seats. Forth is reason, 52
Occupant saf ety
Internal use only