Page 49 of 497

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 limitations
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 Information on PRE-
SAFE®
Impulse Side If an imminent side impact is de
tected, PRE-
SA FE®
Impulse Side can pre-emptively mo vethe
front-seat vehicle occupant's upper body
to wa rdsth e cent reoftheve hicle. It does this by
ra pidly inflating an air cushion in the outer seat
side bols ter of the seat backrest on the side on
which the impact is anticipated. This increases th
e dis tance between the door and theve hicle
occupant.
If PRE-SAFE ®
Impulse Side has been deplo yed or
is faulty, thePRE-SAFE impulse side inoperative
See Owner's Manual display message is shown
(→ page 382). Children in
theve hicle Note
s onthe safe transportation of children &
WARNING Risk of accident and inju ry
due tochildren left unat tended in the
ve hicle
If yo u lea vechildren unat tended in theve hi‐
cle, they may be able toset theve hicle in
motion, forex ample by:
R Releasing the parking brake.
R Shifting the automatic transmission out
of park position jor shifting the manual
transmission into neutral.
R Starting the engine. 46
Occupant saf ety
Page 50 of 497

In addition,
they may operate vehicle equip‐
ment. #
Never lea vechildren and animals unat‐
te nded in theve hicle. #
When leaving theve hicle, alw aysta ke
th eke y with you and lock theve hicle.
This also applies tomobile phones if the
"Digital Car Key in the smartphone"
function is activated via the Mercedes
connect me web app. &
WARNING This poses an increased risk
of death due toheat strokeorexposure
to cold in theve hicle
If persons – particularly children – experi‐
ence prolonged exposure toextremely high
or low temp eratures, this poses a risk of
injury or evenfa ta l injur y. #
Never lea veanyone – pa rticularly chil‐
dren – unat tended in theve hicle. &
WARNING Risk of bu rns when thech ild
seat is exposed todirect sunlight
If th ech ild restra int sy stem is exposed to
direct sunlight or heat, parts could heat up.
Children could suf fer burns on these parts,
particularly on me tallic parts of thech ild
re stra int sy stem. #
Alw ays make sure that thech ild
re stra int sy stem is not exposed to
direct sunlight. #
Protect it with a blank et,fo rex ample. #
Ifth ech ild restra int sy stem has been
ex posed todirect sunlight, allow it to
cool before secu ring a child into it. #
Never lea vechildren unat tended in the
ve hicle. 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 Only secure children using a child restra int
sy stem which is appropriate tothe height, age and
weight of thech ild and suitable for
Mercedes-Benz vehicles. Be sure toobser ve
th e instructions for cor rect use of thech ild
re stra int sy stem.
R Alw ays ins tall a child restra int sy stem on a
re ar seat if possible.
R Onlyuse thefo llowing securing sy stems for
ch ild restra int sy stems:
- the seat belt sy stem
- the ISOFIX or i-Size mounting brac kets
- theTo pTe ther anchorages
R The manufacturer's ins tallation instructions
fo rth ech ild restra int sy stem.
R The warning labels in theve hicle interior and
on thech ild restra int sy stem. &
WARNING Risk of inju ryor death caused
by incor rect ins tallation of thech ild
re stra int sy stem
If th ech ild restra int sy stem is incor rectly
ins talled on a suitable seating position, it
cannot per form its intended pr otective func‐
tion. Occupant saf
ety47
Page 51 of 497

The
child cannot be restra ined in theeve nt of
an accident, heavy braking or a sudden
ch ange of direction. #
Alw ays comply with the manufacturer's
ins tallation instructions forth ech ild
re stra int sy stem and its cor rect use. #
Makesure that the entire base of the
ch ild restra int sy stem alw aysre sts on
th e sitting sur face of the seat. #
Never place objects under or behind
th ech ild restra int sy stem, e.g. cush‐
ions. #
Alw ays use child restra int sy stems with
th e original co ver designed forth em. #
Alw aysre place damaged co vers with
ge nuine co vers. &
WARNING Risk of accident caused by
incor rectly ins talled child restra int sys‐
te ms
If th ech ild restra int sy stem is not cor rectly
ins talled or secured, it could release in the ev
ent of an accident, sudden braking or a
sudden change in direction.
The child restra int sy stem could be flung
around and hit vehicle occupants. This poses
an increased risk of injury or even death! #
Alw ays ins tallch ild restra int sy stems
cor rectl y,eve n when not in use. #
Alw ays comply with thech ild restra int
sy stem manufacturer's ins tallation
instructions. &
WARNING Risk of inju ryor death caused
by the use of damaged child restra int
sy stems
Child restra int sy stems or their retaining sys‐
te ms that ha vebeen subjec tedto a load in
an accident may then not be able toper form
th eir intended pr otective function.
The child cannot be restra ined in theeve nt of
an accident, heavy braking or a sudden
ch ange of direction. #
Alw aysre place child restra int sy stems
immediately that ha vebeen damaged or
in vo lved in an accident. #
Have the securing sy stems forth ech ild
re stra int sy stems checked at a qualified
specialist workshop before ins talling a
ch ild restra int sy stem again. %
Use Mercedes-Benz care products recom‐
mended byMercedes-Benz toclean child
re stra int sy stems. Further information can
be obtained at a qualified specialist work‐
shop.
The following no tes must be obser ved:
R When ins talling a child restra int sy stem on
th e front passenger seat, the information on
ins talling a child restra int sy stem on the front
passenger seat (→ page 52).
R Notes on attaching suitable child restra int
sy stems (→ page54).
R Notes on recommended child restra int sys‐
te ms (→ page61). 48
Occupant saf ety
Page 52 of 497

R
Instructions and saf ety no tes on the auto‐
matic front passenger airbag shutoff
(→ page 41).
R Safety no tes on the seat belt (→ page 33).
R Information on the cor rect use of the seat
belt (→ page37). ISOFIX and i-Size
child seat securing sy stems Information on
the ISOFIX and i-Size child
seat securing sy stems &
WARNING Risk of inju ryor fata l injury if
th ech ild secured weighs more than the
permissible gross weight for an ISOFIX or
i‑Size child restra int sy stem
Fo r ISOFIX or i‑Size child restra int sy stems in
which thech ild is secured using the seat belt
integrated in thech ild restra int sy stem, the
permissible gross weight of thech ild and
ch ild restra int sy stem is 33 kg.
If th ech ild and thech ild restra int sy stem
to ge ther we igh more than 33 kg,th e ISOFIX or i‑Size
child restra int sy stem with integra‐
te d seat belt does not of fer suf ficient pr otec‐
tion. Too much load may be placed on the
ISOFIX or i‑Size child restra int sy stems and
th ech ild may not be restra ined cor rectly in
th eeve nt of an accident, forex ample. #
Ifth ech ild and thech ild restra int sys‐
te m toget her weigh more than 33 kg,
only use an ISOFIX or i‑Size child
re stra int sy stem with which thech ild is
secured with theve hicle seat belt. #
Also secure thech ild restra int sy stem
with theTo pTe ther belt, if available. Alw
ays comply with the information about the
mass of thech ild restra int sy stem
R inthe manufacturer's ins tallation and operat‐
ing instructions forth ech ild restra int sy stem
used
R on a label on thech ild restra int sy stem, if
present
Re gularly check that the permissible gross mass
of thech ild and child restra int sy stem is still
being adhered to. When using a
child restra int sy stem, be sure to
obser vethe manufacturer's ins tallation and
operating instructions as well as its cor rect use
and the suitability of the seats for attaching a
ch ild restra int sy stem.
ISOFIX and i-Size are standardised securing sys‐
te ms for special restra int sy stems. ISOFIX child
re stra int sy stems are appr oved in accordance
with ECE R44, i‑Size child restra int sy stems are
appr oved in accordance with ECE R129.
Only child restra int sy stems that ha vebeen
appr oved in accordance with ECE R44 may be
attached toISOFIX mounting brac kets.
The following child restra int sy stems can be
attached toi-Size securing rings:
R ISOFIX child restra int sy stems that are
appr oved in accordance with ECE R44
R i‑Size child restra int sy stems that are
appr oved in accordance with ECE R129 Occupant saf
ety49
Page 53 of 497

1
Symbol forfitting an ISOFIX child restra int
sy stem
2 Symbol forfitting an i-Size child restra int
sy stem Fi
tting ISOFIX and i-Size child seat attach‐
ments &
WARNING Risk of inju ryor fata l injury if
th ech ild secured weighs more than the
permissible gross weight for an ISOFIX or
i‑Size child restra int sy stem
Fo r ISOFIX or i‑Size child restra int sy stems in
which thech ild is secured using the seat belt
integrated in thech ild restra int sy stem, the
permissible gross weight of thech ild and
ch ild restra int sy stem is 33 kg.
If th ech ild and thech ild restra int sy stem
to ge ther we igh more than 33 kg,th e ISOFIX
or i‑Size child restra int sy stem with integra‐
te d seat belt does not of fer suf ficient pr otec‐
tion. Too much load may be placed on the
ISOFIX or i‑Size child restra int sy stems and
th ech ild may not be restra ined cor rectly in
th eev ent of an accident, forex ample. #
Ifth ech ild and thech ild restra int sys‐
te m toget her weigh more than 33 kg,
only use an ISOFIX or i‑Size child re
stra int sy stem with which thech ild is
secured with theve hicle seat belt. #
Also secure thech ild restra int sy stem
with theTo pTe ther belt, if available. Alw
ays comply with the information about the
mass of thech ild restra int sy stem
R inthe manufacturer's ins tallation and operat‐
ing instructions forth ech ild restra int sy stem
used
R on a label on thech ild restra int sy stem, if
present
Re gularly check that the permissible gross mass
of thech ild and child restra int sy stem is still
being adhered to.
When using a child restra int sy stem, be sure to
obser vethe manufacturer's ins tallation and
operating instructions as well as its cor rect use
and the suitability of the seats for attaching a
ch ild restra int sy stem.
Before everytrip, ma kesure that the ISOFIX
ch ild restra int sy stem or the i-Size child restra int
sy stem is engaged cor rectly in bo thISOFIX or
i‑Size mounting brac kets. 50
Occupant sa fety
Page 54 of 497

1
ISOFIX mounting brac kets
2 i-Size mounting brac kets
* NO
TEDama getothe seat belt forthe
centre seat When
fitting a child restra int sy stem, the seat
belt forth e cent reseat could be damaged. #
Make sure that the seat belt is not trap‐
ped. #
Remo veeach co verfo r ISOFIX mounting
brac kets 1 or i‑Size mounting brac kets 2. #
Attach the ISOFIX child restra int sy stem to
bo th ISOFIX mounting brac kets 1 or i‑Size
mounting brac kets 2.
or #
Attach the i‑Size child restra int sy stem to
bo th i‑Size mounting brac kets 2. #
Afterre moving thech ild seat, replace each
co verfo r ISOFIX mounting brac kets 1 or
i‑Size mounting brac kets 2. Secu
ring TopTe ther &
WARNING Risk of inju ryor death if the
re ar seat backrests are not loc ked af ter
fi tting TopTe ther belts
If th ere ar seat backrests are not loc ked, they
could fold forw ards in theeve nt of an acci‐ dent, heavy braking or sudden
changes of
direction.
As a result, child restra int sy stems cann ot
per form their intended pr otective function.
Re ar seat backrests that are not loc ked can
also cause additional injuries, e.g. in the
ev ent of an accident. #
Alw ays lock rear seat backrests af ter
fi tting TopTe ther belts. #
Obser vethe lock verification indicator. If
th e seat backrest is not engaged and loc ked,
th is will be shown on the multifunction display
on the instrument clus ter.
The risk of injury can be reduced byTopTe ther
as TopTe ther pr ovides an additional connection
between thech ild restra int sy stem secured with
ISOFIX or i-Size and theve hicle.
The child restra int sy stem must be equipped
with a TopTe ther belt. Occupant saf
ety51
Page 55 of 497

#
If necessar y,mo vehead restra int 1
upwards (→ page101). #
Fold up co ver2 ofTopTe ther anchorage
3. #
Fitthe ISOFIX or i-Size child restra int sy stem
with TopTe ther. Alw ays comply with thech ild
re stra int sy stem manufacturer's ins tallation
instructions when doing so. #
Route TopTe ther belt 5under head
re stra int 1 between the two head restra int
bars. #
Hook TopTe ther hook 4ofTopTe ther belt
5 without twisting into TopTe ther anchor‐
age 3. #
Tension TopTe ther belt 5. Alw ays comply
with thech ild restra int sy stem manufactur‐
er's ins tallation instructions when doing so. #
Fold down co ver2 ofTopTe ther anchorage
3. #
If necessar y,slide head restra int 1 down‐
wa rds (→ page 101). Ma kesure that you do not inter
fere with thero uting of TopTe ther
belt 5. Child
restra int sy stems on the front
passenger seat Note
s onchild restra int sy stems on the front
passenger seat
Ac cident statistics show that children secured in
th ere ar seats are safer than children secured in
th e front seats. Forth is reason, Mercedes-Benz
stro ngly advises that you ins tall a child restra int
sy stem on a rear seat.
If it is absolutely necessary toins tall a child
re stra int sy stem on the front passenger seat,
alw ays obser vethe information on the automatic
front passenger airbag shutoff (→ page41).
By doing this, you can avoidrisks caused by:
R Ach ild restra int sy stem that is not de tected
by the automatic front passenger airbag
shutoff.
R The unintentionally disabled front passenger
airbag. 52
Occupant saf ety
Page 56 of 497

R
Incor rect positioning of thech ild restra int
sy stem. Wa
rning notice on the front-passen ger sun
visor: &
WARNING Risk of inju ryor death from
using a rear wa rd-facing child restra int
sy stem when 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 rdfacing child restra int
on a seat pr otected byan ACTIVE FRONT
AIRB AGin front of it; DE ATH or SERIOUS
INJU RYtotheCH ILD can occur. If
th ePA SSENGER AIR BAG OFF indicator lamp
goes out, the front passenger airbag is enabled.
Be sure toobser vethe no tes on the safe trans‐
por tation of children (→ page 46).
Note s onvehicles without the automatic
front passenger front airbag deactivation
sy stem
Ve hicles without automatic front passenger front
airbag deactivation sy stem ha vea special sticker
af fixe dto the side of the cockpit on the front
passenger side. Ne
ver ins tall a rear wa rd-facing child restra int
sy stem on the front passenger seat:
Make sure you obse rveth efo llowing informa‐
tion:
R Onforw ard-facing and rear wa rd-facing child
re stra int sy stems on the front passenger seat
(→ page 54).
R On attaching suitable child restra int sy stems
(→ page 54). Occupant saf
ety53