length MERCEDES-BENZ CLA 2018 Owners Manual

passenger fron ta ir bag is enabled or disa-
bled in accordance with the person in the
front-passenger seat R
the front-passenger seat has been moved
back as far back as possible. R
the person is seated correctly.
Make sure, both before and during the jour-
ney, that the status of the front-passenger
fron ta ir bag is correct.
G WARNING
If you secure ac hild in ar earward-facing child
restraint system on the front-passenger seat
and the PASSENGER AIR BA GO FF indicator
lamp is off, the front-passenger fron ta ir bag
can deploy in the event of an accident. The
child could be struck by the air bag. This poses
an increased risk of injury or even fatal injury.
Make sure that the front-passenger fron ta ir
bag has been deactivated. The PASSENGER
AIR BA GO FF indicator lamp must be lit.
NEVER use ar earward-facing child restraint
on as eat protected by an ACTIVE FRONT AIR-
BA Ginf ron tofi t; DEATH or SERIOUS INJURY
to the child can occur.
If the PASSENGER AIR BA GO FF indicator lamp
stays off, do not install ar earward-facing child
restraint system on the front-passenger seat.
You can find more information on OCS under
"Problems with the Occupant Classification Sys-
tem" ( Y
page 51).
G WARNING
If you secure ac hild in af orward-facin gc hild
restraint system on the front-passenger seat
and you position the front-passenger seat too
close to the dashboard, in the event of an
accident, the child could: R
come int oc ontact with the vehicle's inte-
rior if the PASSENGER AIR BA GO FF indi-
cator lamp is lit, for example R
be struck by the air bag if the PASSENGER
AIR BA GO FF indicator lamp is off
This poses an increased risk of injury or even
fatal injury. Always move the front-passenger seat as far
back as possible and fully retract the seat
cushion length. Always make sure that the
shoulder belt strap is correctly routed from
the vehicle belt sash guide to the shoulder
belt guide on the child restraint system. The
shoulder belt strap must be routed forwards
and downwards from the vehicle belt sash
guide. If necessary, adjust the vehicle belt
sash guide and the front-passenger seat
accordingly. Always observe the child
restraint system manufacturer's installation
instructions.
If OCS determines that: R
The front-passenger seat is unoccupied, the
PASSENGER AIR BA GO FF indicator lamp
lights up after the system self-test and
remains lit. This indicates that the front-
passenger fron ta ir bag is deactivated. R
The front-passenger seat is occupied by a
child of up to twelve months old, in as tandard
child restraint system, the PASSENGER AIR
BA GO FF indicator lamp lights up after the
system self-test and remains lit. This indi-
cates that the front-passenger fron ta ir bag is
deactivated.
But even in the case of at welve-month-old
child, in as tandard child restraint system, the
PASSENGER AIR BA GO FF indicator lamp can
go out after the system self-test. This indi-
cates that the front-passenger fron ta ir bag is
activated. The result of the classification is
dependen to n, among other factors, the child
restraint system and the child's stature. It is
recommended that you install the child
restraint system on as uitable rear seat.R
The front-passenger seat is occupied by a
person of smaller stature (e.g. at eenager or
small adult), the PASSENGER AIR BA GO FF
indicator lamp lights up and remains lit after
the system self-test dependin gont he result
of the classification or, alternatively, goes out. -
If the PASSENGER AIR BA GO FF indicator
lamp is off, move the front-passenger seatOccupant safety 49
Safety Z

Problem
Possible causes/consequences and P Solutions
The PASSENGER AIR
BAG OFF indicator lamp
lights up and remains lit,
even though the front-
passenger seat is occu-
pied by an adult or ap er-
son of as tature corre-
sponding to that of an
adult. The classification of the person on the front-passenger seat is incor-
rect. X
Make sure the condition sf or ac orrect classification of the person
on the front-passenger seat are met ( Y
page 48).X
If the PASSENGER AIR BAG OFF indicator lamp remains lit, the front-
passenger seat may not be used. X
Have OCS checked as soon as possible at an authorized Mercedes-
Benz Center.
The PASSENGER AIR
BAG OFF indicator lamp
does not light up and/or
does not stay on.
The front-passenger seat
is: R
unoccupied R
occupied with the
weight of ac hild up to
twelve months old in a
child restraint system OCS is malfunctioning. X
Make sure there is nothin gb etween the seat cushion and the child
seat. X
Make sure that the entire base of the child restraint system rests on
the seat cushion of the front-passenger seat. The backrest of the
forward-facing child restraint system must lie as flat as possible
against the backrest of the front-passenger seat. If necessary,
adjust the position of the front-passenger seat. X
Make sure that the seat cushion length is fully retracted. X
When installing the child restraint system, make sure that the seat
belt is tight. Do not pull the seat belt tight using the front-passenger
seat adjustment .T his could result in the seat belt and the child
restraint system being pulled too tightly. X
Check for correct installation of the child restraint system.
Make sure that the head restraint does not apply al oad to the child
restraint system. If necessary, adjust the head restraint accord-
ingly. X
Make sure that no object sa re applying additional weight onto the
seat. X
If the PASSENGER AIR BAG OFF indicator lamp remains off and/or
the PASSENGER AIR BAG ON indicator lamp lights up, do not install
ac hild restraint system on the front-passenger seat. It is recom-
mended that you install the child restraint system on as uitable rear
seat. X
Have OCS checked as soon as possible at an authorized Mercedes-
Benz Center.
Deployment of Emergency Tensioning
Devices and air bags
Important safety notes
G WARNING
The air bag parts are hot after an air bag has
been deployed. There is ar isk of injury.
Do not touch the air bag parts. Have a
deploye da ir bag replaced at aq ualified spe-
cialist workshop as soon as possible. G WARNING
Ad eploye da ir bag no longer offers any pro-
tection and cannot provide the intended pro-
tection in an accident. There is an increased
risk of injury.
Have the vehicle towed to aq ualified special-
ist workshop in order to have ad eploye da ir
bag replaced.
It is important for your safety and that of your
passenger to have deploye da ir bags replaced52
Occupant safety
Safety

the househol dr ubbish .T hey
must be collected separately
and recycle dtop rotect the
environment.
Dispose of batteries in an
environmentall yf riendly
manner. Take discharged
batteries to aq uali fied spe-
cialist workshop or as pe cial
collectio np oi nt for used bat-
teries.
! Hav et he battery checked regularly at a
qualified specialis tw or kshop.
Observe the service intervals in the Mainte-
nanc eB ookle torc ontact aq uali fied specialist
workshop for mor ei nformation.
! Yo us houl dh av ea ll work involvin gt he bat-
tery carrie do ut at aq uali fied specialis tw or k-
shop. In the exceptiona lc as et ha titi sn eces-
sary for yo utod is connect the battery your-
self, make sure that: R
yo us wi tch off the engine and remove the
key .Onv ehicles with KEYLESS-GO, ensure
tha tt he ignition is switched off .C he ck that
al lt he indicator lamps in the instrument
cluste ra re off .O therwise, electronic com-
ponents ,s uc hast he alternator, ma yb e
damaged. R
yo uf irst remove the negative terminal
clamp and the nt he positive terminal
clamp. Never swap the termina lc lamps.
Otherwise, the vehicle' se le ctronic system
ma ybed amaged .R
in vehicles with automatic transmission,
the transmission is locked in position P
after disconnecting the battery .T he vehicle
is secur ed a gainst rolling away .Y ou ca
n
the nnol on ge rm ov et he vehicle.
The battery and the cove roft he positive ter-
minal clamp must be installe ds ec urel yd ur ing
operation.
Compl yw it hs af ety precautions and take pro-
tective measures when handling batteries. Risk of explosion.
Fire, open flames and smoking are
prohibited when handling the bat-
tery .A voi dc reating sparks.
Battery aci disc austic. Avoi dc ontact
with skin, eyes or clothing.
Wear suitabl ep rotective clothing,
especiall yg lo ves, apron and face-
guard.
Rinse any aci ds pills immediately
with clear water. Contact ap hysician
if necessary.
Wear ey ep rotection.
Kee pc hildren away.
Observe thi sO pe rator' sM an ual.
For safety reasons, Mercedes-Benz recom-
mend st ha ty ou onl yu se batteries which have
been tested and approved for your vehicl eb y
Mercedes-Benz. Thes eb at teries provide
increase di mpact protection to prevent vehicle
occupants fro ms uf ferin ga ci db ur ns shoul dt he
battery be damage dint he event of an accident.
In order for the battery to achieve the maximum
possibl es er vice life, it must always be suffi-
ciently charged.
Like othe rb at teries ,t he vehicl eb at tery may
discharge ove rt im eify ou do not us et he vehicle.
In thi sc ase, have the battery disconnecte data
qualified specialis tw or kshop .Y ou can also
charge the battery with ac harge rr ecommended
by Mercedes-Benz. Contact aq uali fied special-
is tw or kshop for furthe ri nformation.
Hav et he battery condition of charge checked
mor ef requentl yify ou us et he vehicl em ai nl yf or
short trip sorify ou leav eits tanding idle for a
length yp er iod. Consult aq uali fied specialist
workshop if yo uw is htol eave your vehicle
parked for al on gp er io doft ime.
Onl yr eplace ab at tery with ab at tery tha th as
been recommended by Mercedes-Benz.Battery (vehicle) 277
Breakdow na ssistance Z

G WARNING
During charging and jump-starting, explosive gase sc an escap ef rom the battery .T here is ar isk
of an explosion.
Particularl ya voi df ire, open flames, creating sparks and smoking. Ensure there is sufficient ven-
tilation while charging and jump-starting. Do not lea no ver ab attery.
G WARNING
During the charging process ,ab attery produces hydrogen gas. If as hort circui to ccurs or sparks
are created ,t he hydrogen gas can ignite. There is ar isk of an explosion.R
Make sure that the positive terminal of ac onnected battery does not come into contact with
vehicl ep arts.R
Never place metal objects or tools on ab attery.R
It is important that you observe the described order of the battery terminal sw hen connecting
and disconnecting ab attery.R
When jump-starting, make sure that the battery pole sw ith identical polarity are connected.R
It is particularl yi mportant to observe the described order when connecting and disconnecting
the jumper cables. R
Never connect or disconnect the battery terminal sw hile the engine is running.
G WARNING
Ad ischarged battery can freeze at temperatures below freezing point. When jump-starting the
vehicl eorc harging the battery ,g ase sc an escap ef rom the battery .T here is ar isk of an explosion.
Allow the frozen battery to thaw out before charging it or jump-starting.
! Avoid repeated and lengthy starting attempts. Otherwise, the catalytic converter coul db e
damaged by the non-combusted fuel.
If the indicator/warning lamp sdon ot light up in the instrument cluster at low temperatures, it is very
likel yt hat the discharged battery has frozen. In this case you may neither jump-start the vehicl en or
charge the battery .L et the battery thaw first. The service life of at hawed-out battery may be shorter.
The starting characteristics can be impaired ,p articularl yatl ow temperatures. Have the thawed-out
battery checked at aq ualified specialist workshop.
Do not start the vehicl eu sing ar api dc harging device. If you rv ehicle's battery is discharged, the
engine can be jump-started from another vehicl eorf rom as econd battery using jumper cables.
Observe the following points: R
The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible ,j ump-
start the vehicl eu sing as econd battery or aj ump-starting device.R
You may only jump-start the vehicl ew hen the engine and exhaust system are cold.R
Do not start the engine if the battery is frozen. Let the battery thaw first. R
Only jump-start from batterie sw ith a12Vv oltag er ating.R
Only use jumper cables that are not damaged and have as ufficient cross-section and insulated
terminal clamps. R
Make sure that the two vehicles do not touch. Jump-starting 279
Breakdown assistance Z

Model Vehicle length
Mercedes ‑ AM Gv ehi-
cles 184.7 in (4691 mm)
All other models
182.7 in (4640 mm)
Model Vehicle height
Mercedes ‑ AM Gv ehi-
cles 55.7 in (1416 mm)
All other models
56.5 in (1436 mm)
Model Maximum roof
load
Mercedes ‑ AM Gv ehi-
cles 220.5 lb (100 kg)
All other models
220.5 lb (100 kg)
Model Maximum trunk
load
Mercedes ‑ AM Gv ehi-
cles 220.5 lb (100 kg)
All other models
220.5 lb (100 kg) Vehicle data 321
Technical data Z