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Anti-theftprotection
Immobilizer
The immobilizer pr events your vehicle from being
st ar tedw ithout thec orrect key.
The immobilizer is automaticall yactivated when
th ei gnition is switched of fand deactivated when
th ei gnition is switched on.
When leaving thev ehicle, alw ayst aket he key
wit hyou and loc kthe vehicle. An yone can start
th ee ngine if avalid keyh as been lef tins ide the
ve hicle.
% Inthee vent that thee ngine cannot bestar‐
te d( yetthe star terb atter yisc harged), the
sy stem is no toperational. Contact an
authorized Mercedes-Benz Center or call
1-800-FO R-MERCedes (in theU SA)or
1-800-387-0 100( in Canada).
ATA (anti-thef talarm system)
Fu nction of theA TAsystem (anti-thef talarm
sy stem)
If th eA TAsystem is armed, avisual and audible
alar mist riggered in thef ollowing situations:
RAd oor is opened
RThe trunk lid is opened
RThe engin ehood is opened
The ATA system is armed automaticall yafter
appr oximatel y10seconds:
RAfterl ocking thev ehicle wit hthe SmartK ey.
RAf terl ocking thev ehicle using KEYLESS-GO.
When theA TAsystem is armed, indicator
lamp :flashes.
The ATAs ystem is automaticall ydeactivated:
RAfteru nlocking thev ehicle wit hthe Smart‐
Ke y.
RAfterp ressing thes tart/s topb utton wit hthe
Sma rtKe yinsid ethe vehicle.
Opening and closing 79
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RAfteru nlocking thev ehicle using KEYLESS-
GO.
% Ifth em brace service (
→page247)isa ctive
and thea larms tays on form oret han 30 sec‐
onds, amessag eisautomaticall ysenttot he
Cus tomer Assis tance Center.
Deacti vatin gthe ATA (anti-thef talarm sys‐
te m) ala rm
#Pressthe%, &orp button on the
SmartK ey.
or
#Press thes tart/s topb utton on thec ockpit
(the SmartK eyis inside thev ehicle).
St opping thea larm using KEYLESS-GO
#Grasp theo utside door handle (wit hthe
Sma rtKe yo utside thev ehicle).
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Opening and closing
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Correct driver' sseat position
&
WARNING Risk of injury from adjusting
th ev ehicle settings while thev ehicle is in
motion
Yo uc ouldlose cont roloft hevehicle in the
fo llowing situations:
Rifyo ua djus tthe driver's seat, theh ead
re stra int ,the steering wheel or them irro r
while thev ehicle is in motion
Rifyo uf asteny our seat belt whil ethe vehi‐
cle is in motion
#Befor estarti ngthee ngine: adjus tthe
driver's seat, theh ead restra int ,the
st eering wheel or them irro ra nd fasten
yo ur seat belt.
Obser vethef ollowing when adjusting steering
wheel 1,seat belt 2and driver's seat 3:
RYoua reas fara wa yfromt he driver's airbag
as possible.
RYo ua resittin ginan ormalupright position.
RYour thighs ar eslightly suppor tedbyt he seat
cushion.
RYo ur legs ar enotentirel ystret ch ed and you
can dep ress thep edals proper ly.
RThe bac kofyour head is suppor tedate ye
le ve lbyt he center of theh ead restra int.
RYo uc an hold thes teering wheel wit hyour
arms slig htlybent.
RYouc an mo veyour legs freel y.
RYouc an see all thed ispla ysinthei nstrument
clus terc lea rly.
RYo us hould ha veag ood overviewoft raffic
conditions.
RThe seatb elti sp ulle dsnug lyagains tthe
body and mus tberouted across thec enter
of your shoulder and across your hips in the
pelvic area.
Seats and stowing 81
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Seats
Adjustin gthe fron tseatm anuall yand elec‐
tricall y(withou tSeatC om fort Pa ckage)
&
WARNING Risk of becoming trapped if
th es eats ar eadjus tedbyc hildren
Childre ncould becom etrapped if they adjust
th es eats, particularly when unattended.
#When leaving thev ehicle, alw ayst ake
th eS martK eywit hyou and loc kthe
ve hicle.
#Ne verlea ve children unatte ndedint he
ve hicle.
The seats can be adjus tedw hen thei gnition is
switched off.
& WARNING Risk of becoming trapped
whe nadjusting thes eats
When youa djus tas eat,y ou or other vehicle
occupants could become trapped, e.g. on the
seat guide rail.
#Mak esurew hen adjustin gaseatthat
no oneh as anybody parts in thes weep
of thes eat.
Obser vethes afet yn otes on "Airbags "and "Chil‐
dren in thev ehicle".
&
WARNING Risk of accident duetot he
driver's seat no tbeing engaged
If th ed rive r's seat is no tengaged, it could
mo veunexpectedl ywhile thev ehicle is in
motion.
This could cause youtol ose control of the
ve hicle.
#Alw aysm akes uret hat thed rive r's seat
is engaged befor estartin gt he vehicle.
&
WARNING Risk of injury from adjusting
th ev ehicle settings while thev ehicle is in
motion
Yo uc ouldlose cont roloft hevehicle in the
fo llowing situations:
Rifyo ua djus tthe driver's seat, theh ead
re stra int ,the steering wheel or them irro r
while thev ehicle is in motion
Rifyo uf asteny our seat belt whil ethe vehi‐
cle is in motion
#Befor estarti ngthee ngine: adjus tthe
driver's seat, theh ead restra int ,the
st eering wheel or them irro ra nd fasten
yo ur seat belt.
&
WARNING Risk of becoming trapped if
th es eat height is adjus tedc arelessly
If yo ua djus tthe seat height carelessly ,you
or other vehicle occupants could be trapped
and thereb yinjured.
82
Seats and stowing
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Childreninparticular could acc identally
press thee lectrical seat adjustmen tbuttons
and become trapped.
#While moving thes eats, mak esuret hat
hands or other body parts do no tget
under thel eve rassembly of thes eat
adjustmen tsystem.
&
WARNING Risk of injury duetohead
re stra int sw hicha renotins talled or are
adjus tedi nco rrectly
If head restra int sa renotins talled or are
adjus tedi ncor rectly ,the head restra int sc an‐
no tp rovide pr otection as intended.
Ther eisani ncreased risk of injur yinthe
head and nec karea, e.g. in thee vent of an
accident or when braking.
#Alw aysd rive wit hthe head restra ints
ins talled.
#Befor edrivingo ff,m akes uref or every
ve hicle occupant that thec enter of the
head restra int supports theb ackoft he
head at about eyel eve l.
Do no texchang ethe head restra int soft he front
and rear seats. Otherwise, youc anno tadjus tthe
height and angle of theh ead restra int sc orrectl y.
Ad jus tthe head restra int fore -and-af tposition so
th at it is as close as possible totheb ackofy our
head.
& WARNING Risk of injury duetoan incor‐
re ct seatp osition
The seatb eltd oesn otoffert he intended
le ve lofp rotection if youh ave notm ove dthe
seat backres ttoanalmostvertical position.
When braking or in thee vent of an accident,
yo uc ould slide underneat hthe seat belt and
sus tain abdomen or nec kinjuries, fore xam‐
ple. This posesani ncreased risk of injur yor
ev en fata linjur y.
#Adjus tthe seat cor rectly befor estarting
th ej ourne y.
#Alwayse nsur ethat thes eat backres tis
in an almos tvertical position and that
th es houlder section of your seat belt is
ro uted across thec enter of your shoul‐
der.
* NO
TEDama getothes eats when moving
th es eats back
The seats ma ybedamaged byobject swhen
moving thes eats bac k.
#When moving thes eats bac k,make
sur ethat ther ea reno objects in the
fo ot we ll or under or behindt he seats.
Seats andstowing 83
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1Seatbackres tinclination
2Seat height
3Seat fore -and-af tposition
#To adjus tthe sea tfore-and-a ftposition:
lif tl eve r3 and slid ethe seat int othe
desired position.
#Mak esuret hat thes eat is engaged.
Adjustin gthe fron tseatm anuall yand elec‐
tricall y(with Seat Comfor tPacka ge)
1Seat backres tinclination
2Seat height
3Seat cushion inclination
4Seat fore -and-af tposition
5Sea tcushion length
#To adjus tthe sea tfore-and-a ftposition:
lif tl eve r4 and slid ethe seat forw ards or
backwards.
#Mak esuret hat thes eat is engaged.
#To adjus tthe sea tcushion length: liftl eve r
5 and slide thef ront section of thes eat
cushion forw ards or backwards.
Ad justin gthe seats electrically
Thes eats can be adjus tedw hen thei gnition is
switched off.
Obser vethes afet yn otes on "Airbags "and "Chil‐
dren in thev ehicle".
84
Seats and stowing
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1Headrestraint height
2Seat backres tinclination
3Seat height
4Seat cushio nlength
5Seat cushio ninclination
6Seat fore -and-af tposition
#Save thes ettings wit hthe memor yfunction
(→pag e93).
Adjustin gthe 4-w aylumbar support
1Toraise
2To sof ten
3To lowe r
4To harden
#Using buttons 1to4,a djustthe contour
of theb ackres tindividuall ytosuityour bac k.
Headrestra ints
Ad justin gthe fron tseath eadr estraints man‐
ually
& WARNING Risk of injury from adjusting
th ev ehicle settings while thev ehicle is in
motion
Yo uc ouldlose cont roloft hevehicle in the
fo llowing situations:
Rifyo ua djus tthe driver's seat, theh ead
re stra int ,the steering wheel or them irro r
while thev ehicle is in motion
Rifyo uf asteny our seat belt whil ethe vehi‐
cle is in motion
#Befor estarti ngthee ngine: adjus tthe
driver's seat, theh ead restra int ,the
st eering wheel or them irro ra nd fasten
yo ur seat belt.
Seats and stowing 85
Page 88 of 446

&WARNING Risk of injury duetohead
re stra int sw hicha renotins talled or are
adjus tedi ncor rectly
If hea drestraints ar enotins talled or are
adjus tedi ncor rectly ,the head restra int sc an‐
no tp rovide pr otection as intended.
Ther eisani ncreased risk of injur yinthe
head and nec karea, e.g. in thee vent of an
accident or when braking.
#Alw aysd rive wit hthe head restra ints
ins talled.
#Befor edrivingo ff,m akes uref or every
ve hicle occupant that thec enter of the
head restra int supports theb ackoft he
head at about eyel eve l.
Do no tinter chang ethe head restra int soft he
front and rear seats. Otherwise, youc annot
adjus tthe height and angle of theh ead
re stra int sc orrectl y.
Ad jus tthe head restra int fore -and-af tposition so
th at it is as close as possible totheb ackofy our
head.
#To raise: pulltheh ead restra int up.
#To lowe r:press release knob 1inthed irec‐
tion of thea rrow and push theh ead restra int
down.
Ad justin gthe gapb etwe en the head
re stra int and theb ackofy our head:
#Tomo veforw ards: pullthe head restra int
fo rw ards.
#To mo vebackwards: pressrelease knob 2
and push theh ead restra int backwards.
Ad justin gthe fron tseatluxur yhead
re stra int manually
#To adjus tthe sid ebolsters of theh ead
re stra int: pull or push ther ight or left-hand
side bols ter2.
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Seats and stowing