2018 MERCEDES-BENZ CLA brake light

Display messages
Possible causes/consequences and P Solutions
The yellow $ warning lamp lights up and th er ed I (US Ao nl y)
or $ (Canada only) indicator lamp flashes .
It is no tp ossibl etoa pply th ee lectric parking brak em anually.X
Shift th et ra nsmission to position E .X
Visit aq ualified specialist workshop .
' (US Ao nl y)
M (Canada only)
Check Brake Fluid
Level There is no te no ugh brak ef lui dint he brak ef luid reservoir .
Aw arning tone sounds. The ' (US Ao nl y) or M (Canada only)
warning lamp sint he instrumen tc luste rm ay also ligh tu p.
G WARNIN G
The braking effec tm ay be impaired.
There is ar is kofana ccident.X
Pull ove ra nd stop th ev ehicl es afely as soo nasp ossible, payin g
attention to roa da nd traffic conditions. Do no tc ontinue drivin g
under any circumstances. X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Consult aq ualified specialist workshop .X
Do no ta dd brak ef luid .T his does no tc orrect th em alfunction .
& Check Brake Pad Wea r The brak ep ads/linings hav er eached their wear limit.X
Visit aq ualified specialist workshop .
S Inoperative On eorm or em ain features of th em brace system are malfunctioning .X
Visit aq ualified specialist workshop .
Active Brake Assist
Functions Currently
Limite dS ee Opera‐
tor's Manual Active Brake Assis tist em porarily inoperative.
Possibl ec auses are: R
The radar sensor system is temporarily inoperative, e.g. due to
electromagneti cr adiation emitted by nearby TV or radi os ta tion so r
other source sofe lectromagneti cr adiation .R
The system is outside th eo perating temperature range.R
The on-boar dv oltag eist oo low.
Whe nt he causes state da bov enol onger apply, th ed isplay message
disappears.
Active Brake Assis tiso perational again .
If th ed isplay message does no td isappear :X
Pull ove ra nd stop th ev ehicl es afely as soo nasp ossible, payin g
attention to roa da nd traffic conditions.X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Restart th ee ng ine.
Active Brake
Assist : System Inop‐
erativ e Active Brake Assis tisu navailable due to am alfunction .S ituation -
dependen tb raking assistanc em ay also hav ef ailed.X
Visit aq ualified specialist workshop immediately. Display messages 19 7
On-boar dc omputer an dd isplays Z

Display messages
Possible causes/consequences and P Solutions
Radar Sensor s Dirty
See Operator' sM an ‐
ual The radar sensor system is malfunctioning .
Possibl ec auses are: R
Dirt on sensor sR
Heavy rain or snow R
Whe nd rivin goni nter-urban roads without traffic or infrastructure,
e.g. in desert-like area s
At least on ed rivin gs ystem or drivin gs afet ys ystem is malfunctioning
or is temporarily unavailable :R
Active Brake Assis tR
Distanc eP ilo tD ISTR ONI C
Aw arning tone also sounds.
Once th ec aus eoft he problem is no longer present, th ed rivin ga nd
drive safet ys ystems will be available again .T he display message dis-
appears.
If th ed isplay message does no td isappear :X
Pull ove ra nd stop th ev ehicl es afely as soo nasp ossible, payin g
attention to roa da nd traffic conditions.X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Switc ho ff th ee ng ine.X
Clean all sensor s( Y
page 265).X
Restart th ee ng ine.
The display message disappears.
u SRS Malfunction Ser ‐
vic eR equired The restrain ts ystem is malfunctioning .T he u warning lamp also
lights up in th ei nstrumen tc luster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th ee vent of an accident, may no tbet ri ggered .
There is an increased ris kofi njury.X
Visit aq ualified specialist workshop immediately.
Fo rf urther information about th er estrain ts ystem, see ( Y
page 40) .
u Front Lef tM alfunc‐
tio nS ervic e
Required or Front
Right Malfunction
Servic eR equired The restrain ts ystem is malfunctioning at th ef ront on th el ef torr ight .
The u warning lamp also lights up in th ei nstrumen tc luster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th ee vent of an accident, may no tbet ri ggered .
There is an increased ris kofi njury.X
Visit aq ualified specialist workshop immediately.198
Display messages
On-boar dc omputer an dd isplays

Display messages
Possible causes/consequences and P Solutions
If th ec onditi on sa re no tf ulfilled ,t he system is no to perating correctly.X
Visit aq ualified specialist workshop immediately.
Fo rf urther information about th eO cc upant Classification System, see
( Y
page 48).
Lights
i Vehicles wit hL ED bulbs in th el igh tc lusters :
The display message for th ec orre spondin gl amp only appear sw hen all of th eL ED sint he lamp
hav ef ailed.
Display messages
Possible causes/consequences and P Solutions
I Check Lef tC orner ‐
ing Light or Check
Right Cornering
Light The lef torr ight-hand cornering ligh tisd efective.X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Check Lef t Low Bea m
or Check Right Low
Bea m The lef torr ight-hand low-beam headlamp is defective. X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Check Rea rL ef t
Tur nS ignal or
Check Rea rR ight
Tur nS ignal The rear left-han dorr ear right-hand tur ns ignal is defective.X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Check Front Lef t
Tur nS ignal or
Check Front Right
Tur nS ignal The fron tl eft-han dorf ront right-hand tur ns ignal is defective.X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Check Lef tM irror
Tur nS ignal or
Check Right Mirror
Tur nS ignal The tur ns ignal in th el eft-han dorr ight-hand exterio rm irror is defec -
tive. X
Visit aq ualified specialist workshop .
I Check Center Brake
Lam p The high-mounte db rak el amp is faulty.X
Visit aq ualified specialist workshop .202
Display messages
On-boar dc omputer an dd isplays

Display messages
Possible causes/consequences and P Solutions
I Check Lef tB rake
Lam p or Check Right
Brake Lam p The lef torr ight-hand brak el amp is defective.X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Check Lef t Tai l and
Brake Lamps or
Check Right Tai l
and Brake Lamps The lef torr ight-hand tai ll amp/brake lamp is defective.X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Check Lef t Hig h Bea m
or Check Right
Hig hB ea m The lef torr ight-hand high beam is defective. X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Licens eP late Lam p The lef torr ight-hand license plat el amp is faulty.X
Visit aq ualified specialist workshop .
I Rea rF og Lam p The rear fog lamp is faulty. X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Check Front Lef t
Parkin gL am p or
Check Front Right
Parkin gL am p The fron tl ef torf ront right parking or standing lamp is defective.X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Backup Light The backup lamp is defective. X
Chec kw hether you are permitte dtor eplace th eb ulb yourself
( Y
page 104).
or X
Visit aq ualified specialist workshop .
I Check Lef tT ai l
Lam p or Check Right
Tai lL am p The lef torr ight-hand tai ll amp is defective.X
Visit aq ualified specialist workshop .Display messages 20 3
On-boar dc omputer an dd isplays Z

Warning/
indicator
lamp Q Signal type
Possibl ec auses/consequences and P Solutions
%
Q The yellow ABS warning lamp is lit while the engine is running.
ABS (Anti-lock Braking System) is deactivated due to am alfunction. Therefore,
BAS (Brake Assist), Active Brake Assist, ESP ®
(Electronic Stability Program), the
HOLD function and hil ls tart assist, for example, are als od eactivated.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the functions listed
above. The wheels coul dt herefore lock if you brake hard ,f or example.
The steerability and braking characteristics may be severely affected. The braking
distance in an emergency braking situation can increase.
If ESP ®
is not operational ,E SP ®
is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident. X
Observe the additiona ld isplay messages in the multifunction display.X
Drive on carefully. X
Visi taq ualified specialist worksho pi mmediately.
If the ABS control unit is faulty, there is als oap ossibility that other systems ,s uch
as the navigation system or the automatic transmission, wil ln ot be available.
%
Q The yellow ABS warning lamp is lit while the engine is running.
ABS is temporarily unavailable .T herefore, BAS, Active Brake Assist, ESP ®
,E BD
(electronic brake force distribution), the HOLD function and hil ls tart assist, for
example, are als od eactivated.
Possible causes are: R
Self-diagnosi sisn ot yet complete.R
The on-board voltag em ay be insufficient.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the functions listed
above. The front and rear wheels coul dt herefore lock if you brake hard ,f or exam-
ple.
The steerability and braking characteristics may be severely affected. The braking
distance in an emergency braking situation can increase.
If ESP ®
is not operational ,E SP ®
is unable to stabilize the vehicle.
There is ar isk of an accident.X
Carefully drive as uitable distance, making slight steering movements at as peed
above 12 mph (20 km/h).
The functions mentioned above are available again when the warning lamp goes
out.
If the warning lamp is still on: X
Observe the additiona ld isplay messages in the multifunction display.X
Drive on carefully. X
Visi taq ualified specialist worksho pi mmediately.220
Warning and indicator lamps in the instrument cluster
On-board computer and displays

Warning/
indicator
lamp Q Signal type
Possibl ec auses/consequences and P Solutions
$I
Q I (USA only), $ (Canada only): the red indicator lamp for the electric
parking brake flashes or lights up and/or the yellow warning lamp for the electric
parking brake lights up. X
Observe the additiona ld isplay messages in the multifunction display.
u
Q The red restraint system warning lamp is lit while the engine is running.
The restraint system is malfunctioning.
G WARNING
The air bag sorE mergency Tensioning Devices may either be triggere du ninten-
tionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury. X
Observe the additiona ld isplay messages in the multifunction display.X
Drive on carefully. X
Contact aq ualified specialist worksho pa nd have the restraint system checked.
For further information about the restraint system, see ( Y
pag e4 0).
Engine Warning/
indicator
lamp Q Signal type
Possibl ec auses/consequences and P Solutions

X
Do not us eh ot water and do not wash the
vehicl eind ir ect sunlight.X
Use as of ts po ng etoc lean.X
Use am il dc leaning agent, such as ac ar
shampo oa pp roved by Mercedes-Benz.X
Thoroughl yh os ed ow nt he vehicl ew it hag en -
tle jet of water. X
Do not point the water jet directl yt owards the
ai ri nlet.X
Use plenty of water and rinse ou tt he sponge
frequently. X
Rinse the vehicl ew it hc lean water and dry
thoroughl yw it hac hamois.X
Do not le tt he cleaning agent dry on the paint-
work.
Carefully remove al ld eposit sofr oa ds al ta s
soo na sp os sibl ew he nd rivin ginw in ter.
Powe rw as hers
G WARNING
The water jet fro mac ircular jet nozzl e( di rt
blasters )c an cause invisible exterio rd amag e
to the tire sorc hassi sc omponents. Compo-
nents damage dint hi sw ay ma yf ai lu nexpect-
edly .T here is ar is kofana ccident.
Do not us ep ower washers with circular jet
nozzles to clean the vehicle. Hav ed amaged
tire sorc hassi sc omponents replaced imme-
diately.
! Alway sm ai ntain ad is tance of at least
11.8 in (30 cm )b et ween the vehicl ea nd the
powe rw as he rn ozzle. Informatio na bout the
correct distance is availabl ef ro mt he equip-
ment manufacturer.
Mov et he powe rw as he rn ozzl ea round when
cleaning your vehicle.
Do not ai md ir ectl yata ny of the following:R
Tires R
Doo rg aps, roo fg aps, joints, etc.R
Electrical components R
Battery R
Connectors R
Lamps R
Seals R
Trim R
Ventilatio ns lo ts Damaged seals or electrical components can
lead to leaks or failures.
! Vehicles with decorative film: parts of your
vehicl ea re covered with ad ec orative film.
Maintain ad is tance of at leas t2 7.5 in (70 cm)
between the parts of the vehicl ec overed with
the fil ma nd the nozzl eoft he high pressure
cleaner.
Informatio na bout the correct distance is
availabl ef ro mt he eq uip ment manufacturer.
M
ov et he powe rw as he rn ozzl ea round when
cleaning your vehicle.
Cleanin gt he paintwork
! Do not affix: R
stickers R
films R
magnetic plate sors im ilar items
to painte ds ur faces .Y ou could otherwise
damage the paintwork.
Scratches, corrosive deposits, area sa ff ecte db y
corrosion and damage caused by inadequate
car ec anno ta lway sbec ompletel yr epaired .I n
such cases, visit aq uali fied specialis tw or kshop.X
Remov ed ir ti mmediately, where possible,
whil ea voidin gr ubbi ng too hard.X
Soa ki nsect remains with insect remove ra nd
rinse off the treated area sa ft erwards.X
Soa kb ir dd ropping sw it hw at er and rinse off
the treated area sa ft erwards.X
Remov ec oolant, brake fluid ,t ree resin, oils,
fuel sa nd greases by rubbing gently with a
cloth soaked in petroleu me ther or lighter
fluid. X
Use tar remove rtor emove tar stains.X
Use silicone remove rtor emove wax.
If water no longe rf orms "beads "ont he paint
surface, us et he paint car ep roducts recommen-
de da nd approved by Mercedes-Benz. Thi sist he
cas ea pp roximately every thre etof iv em onths,
depending on the climate conditions and the
car ep roduct used.
If dirt ha sp en etrated the paint surface or if the
paint ha sb ec ome dull ,t he paint cleane rr ecom-
mend ed a nd approved by Mercedes-Benz
s houl dbeu sed.
Do not us et hese car ep roducts in the su noro n
the hoo dw hile the hoo dish ot.Care 263
Maintenance and care Z

X
Use as uitabl et ouch-up stick, e.g. MB Touch-
Up Stick ,tor epair slight damage to the paint-
work quickly and provisionally.
Matt ef inish care
! Never polish the vehicle or the light alloy
wheels. Polishing causes the finish to shine.
! The following may cause the paint to
become shiny and thus reduce the matte
effect: R
strong rubbing of the paintwork with
unsuitabl em aterialsR
frequent use of automatic car washes R
washing the vehicle in direct sunlight
! Never use paint cleaner, buffing or polishing
products, or gloss preserver, e.g. wax, for the
purpose of paintwork care. These products
are only suitabl ef or high-gloss surfaces. Their
use on vehicles with matte paintwork leads to
considerable surface damage or, more spe-
cifically ,tos hiny, spotted areas.
Alway sh ave paintwork repairs carried out at a
qualified specialist workshop.
! Do not use wash programs with ah ot wax
treatment under any circumstances.
Observe these notes if your vehicle has ac lear
matte finish. This will help you to avoid damage
to the paintwork due to incorrect treatment.
These notes also apply to light alloy wheels with
ac lear matte finish.
The vehicle should ideally be washed by hand
using as oft sponge, car shampoo and plenty of
water.
Use only insect remover and car shampoo from
the range of approved Mercedes-Benz care
products.
Cleaning the vehicl ep arts
Cleaning the wheels
G WARNING
The water jet from ac ircular jet nozzle (dirt
blasters) can cause invisible exterior damage
to the tires or chassis components. Compo-
nent sd amage dint his way may fail unexpect-
edly .T here is ar isk of an accident. Do not use power washers with circular jet
nozzles to clean the vehicle. Have damaged
tires or chassis component sr eplaced imme-
diately.
! Do not use acidic wheel cleaning products
to remove brake dust. This could damage
wheel bolts and brake components.
! Do not park your vehicle for al ong period of
time directly after cleaning, particularl ya fter
cleaning the wheel rim with wheel cleaner.
Wheel cleaner can lead to the increased cor-
rosion of the brake discs and pads. Therefore,
drive for af ew minutes after cleaning. By
heating up the brakes, the brake discs and
pads dry. The vehicle can then be parked for a
long period of time.
Cleaning the windows
G WARNING
You could become trapped by the windshield
wipers if they start moving while cleaning the
windshiel dorw iper blades. There is ar isk of
injury.
Alway ss witch off the windshiel dw ipers and
the ignition before cleaning the windshiel do r
wiper blades.
! Only fold the windshiel dw ipers awa yf rom
the windshiel dw hen vertical. Otherwise, you
will damage the hood.
! Do not use dry cloths, abrasive products,
solvents or cleaning agents containing sol-
vents to clean the inside of the windows. Do
not touch the insides of the windows with
hard objects, e.g. an ice scraper or ring. There
is otherwise ar isk of damaging the windows.
! Clea nt he water drainage channels of the
windshiel da nd the rear window at regular
intervals. Deposits such as leaves, petals and
pollen may under certain circumstances pre-
vent water from draining away. This can lead
to corrosion damage and damage to elec-
tronic components. X
Clea nt he inside and outside of the windows
with ad amp cloth and ac leaning product that
is recommended and approved by Mercedes-
Benz.264
Care
Maintenance and care