warning light MERCEDES-BENZ CLA 2018 Service Manual

Display messages
Possible causes/consequences and P Solutions
The yellow $ warning lamp and th er ed I (US Ao nl y) or $
(Canada only) indicator lamp ligh tu p.
The electric parking brak eism alfunctioning .
To release: X
Switc ho ff th ei gnition and tur nitb ac ko n.X
Releas et he electric parking brak em anually.
or X
Releas et he electric parking brak ea utomatically ( Y
page 142).
If th ee lectric parking brak es ti ll canno tber eleased:X
Do no td rive on .X
Consult aq ualified specialist workshop .
The red I (US Ao nl y) or $ (Canada only) indicator lamp flashes
and th ey ellow $ warning lamp lights up.
The electric parking brak eism alfunctioning .
To release: X
Switc ho ff th ei gnition and tur nitb ac ko n.X
Releas et he electric parking brak em anually.
To apply : X
Switc ho ff th ei gnition and tur nitb ac ko n.X
Apply th ee lectric parking brak em anually.
If th er ed I (US Ao nl y) or $ (Canada only) indicator lamp con-
tinue stof lash: X
Do no td rive on .X
Secur et he vehicl ea gainst rollin ga way ( Y
page 309).X
Shift th et ra nsmission to position E .X
Turn th ef ront wheels toward st he curb.X
Consult aq ualified specialist workshop .Display messages 19 5
On-boar dc omputer an dd isplays Z

Display messages
Possible causes/consequences and P Solutions
The yellow $ warning lamp lights up. The red I (US Ao nl y)
or $ (Canada only) indicator lamp flashes for about te ns econds
after th ee lectric parking brak eh as been applie dorr eleased. It then
goe so ut or remain sl it .
The electric parking brak eism alfunctioning .X
Switc ho ff th ei gnition and tur nitb ac ko n.X
Apply th ee lectric parking brake.
If it is no tp ossibl etoe ng age th ee lectric parking brake:X
Shift th et ra nsmission to position E .X
Visit aq ualified specialist workshop .
If it is no tp ossibl etor elease th ee lectric parking brak em anually:X
Releas et he electric parking brak ea utomatically ( Y
page 142).
If th ee lectric parking brak es ti ll canno tber eleased:X
Consult aq ualified specialist workshop .
The yellow $ warning lamp lights up. If you manually apply or
release th ee lectric parking brake, th er ed I (US Ao nl y) or $
(Canada only) indicator lamp flashes .
The electric parking brak eism alfunctioning .Itisn ot possibl etoa pply
th ee lectric parking brak em anually.X
Shift th et ra nsmission to position E ,ast he electric parking
brak eisn ot applie da utomatically.X
Visit aq ualified specialist workshop .
I (US A
only)
$ (Canada
only)
Parkin gB rake Inop‐
erativ e The yellow $ warning lamp lights up. The red I (US Ao nl y)
or $ (Canada only) indicator lamp flashes for about te ns econds
after th ee lectric parking brak eh as been applie dorr eleased. It then
goe so ut or remain sl it .
The electric parking brak eism alfunctioning ,e .g .b ecause of over-
voltag eoru ndervoltage. X
Remove th ec aus ef or th eo vervoltage or undervoltage, e.g. by
charging th eb attery or restarting th ee ng ine.X
Engage or release th ee lectric parking brake.
If it remain si mpossible to apply or release th ee lectric parking brake:X
Switc ho ff th ei gnition and tur nitb ac ko n.X
Engage or release th ee lectric parking brake.
If th ee lectric parking brak es ti ll canno tber eleased:X
Consult aq ualified specialist workshop .
If th ee lectric parking brak es ti ll canno tbea pplied:X
Visit aq ualified specialist workshop .196
Display messages
On-boar dc omputer an dd isplays

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
u Rea rL ef tM alfunc‐
tio nS ervic e
Required or Rea r
Right Malfunction
Servic eR equired The rear left-han dorr ight-hand restrain ts ystem is malfunctioning .
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.
u Lef tS id eC urtai n
Airbag Malfunction
Servic eR equired or
Right Sid eC urtai n
Airbag Malfunction
Servic eR equired The left-han dorr ight-hand window curtai na ir bag is malfunctioning .
The u warning lamp also lights up in th ei nstrumen tc luster.
G WARNIN G
The lef torr ight window curtai na ir bag may either be triggered unin-
tentionally 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. Display messages 19 9
On-boar dc omputer an dd isplays Z

Warning and indicator lamps in the instrument cluster
General notes Some systems carry out as elf-diagnosis when the ignition is switched on. Therefore, some indicator
and warning lamps may light up or flas ht emporarily .T his behavior is non-critical.
These indicator and warning lamps only indicate am alfunction if they light up or flas ha fter starting
the engine or whilst driving.
Safety
Seat belts Warning/
indicator
lamp Q Signal type
Possibl ec auses/consequence sa nd P Solutions

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

General notes The multimedia system section in this Opera-
tor's Manua ld escribes the basi cp rinciples for
operation. More information can be found in the
Digital Operator's Manual.
Important safety notes
G WARNING
If you operate information systems and com-
municatio ne quipment integrated in the vehi-
cle when driving, you may be distracted from
the traffic situation. You could also lose con-
trol of the vehicle .T here is ar isk of an acci-
dent.
Only operate this equipment when the traffic
situation permits. If you are not sure that this
is possible, park the vehicle paying attention
to traffic conditions and operate the equip-
ment when the vehicle is stationary.
You must observe the lega lr equirements for the
country in which you are currently driving when
operating the multimedia system.
The multimedia system calculates the route to
the destination withou tt aking the following into
account, for example: R
traffic lights R
stop and yield signs R
parking or stopping restrictions R
road narrowing R
other road and traffic rule sa nd regulations
The multimedia system may give incorrect nav-
igation recommendations if the actual street/
traffic situation does not correspond with the
digital map's data.
For example: R
ad iverted route R
the road layout or the direction of ao ne-way
street has been changed
For this reason, you must alway so bserve road
and traffic rule sa nd regulations during your
journey. Roa da nd traffic rule sa nd regulations
alway sh ave priority over multimedia system
driving recommendations. Navigation announcements are intended to
direct you whil ed riving withou td iverting your
attention from the road and driving.
Please alway su se this feature instead of con-
sulting the map display for directions. Looking
at the icons or map display can distract you from
traffic conditions and driving, and increase the
risk of an accident.
This equipment complies with FCC radiation
exposure limits set forth for uncontrolled equip-
ment and meets the FCC radi of requency (RF)
Exposure Guidelines in Supplement CtoO ET65.
This equipment has very low level sofRFe nergy
that is deeme dtoc omply withou tm aximum
permissive exposure evaluation (MPE). How-
ever, it is recommended to insta l l it at ad istance
of at least 8i nches (approx. 20 cm) betwee nt he
radiation source and ap erson's body (not
including limb ss uch as hands, wrists, feet and
legs).
G WARNING
Modifications to electronic components, their
software as wel lasw iring can impair their
function and/or the function of other net-
worked components. In particular, systems
relevant to safety could also be affected. As a
result, these may no longer function as inten-
ded and/or jeopardize the operating safety of
the vehicle .T here is an increase dr isk of an
accident and injury.
Never tamper with the wiring as wel lase lec-
tronic components or their software .Y ou
shoul dh ave all work to electrica la nd elec-
tronic equipment carried out at aq ualified
specialist workshop.
Function restrictions
For safety reasons, some functions are restric-
ted or unavailable whil et he vehicle is in motion.
You wil ln otice this, for example, because either
you wil ln ot be abl etos elect certain menu items
or am essag ew il la ppear to this effect.Function restrictions 229
Multimedia system Z

Currently inactiv ea reas can be activated by text
message.
Triggering th ev ehicle alarmWit ht hi sf unction ,y ou can trigge rt he veh icle 's
pan ic alarm via text message. An alarm soun ds
and th ee xteri or lighting flashes. Depen din go n
th es etting, th ep an ic alarm last sf iv eort en sec-
onds. Afterwards, th ea larm swit ches off.
Garage door opener
General notes The HomeLink ®
garag ed oor opener integrated
in th er ear-view mirror allows you to operate up
to three diff erent door and gat es ystems.
Use th ei ntegrate dg arag ed oor opener on ly on
garag ed oor st ha t:R
have safety stop and revers ef eatures andR
mee tc urren tU .S .f ederal safety standards
Once programed, th ei ntegrate dg arag ed oor
opener in th er ear-view mirror will assum et he
function of th eg arag ed oor system' sr emote
control. Pleas ea lso read th eo peratin gi nstruc-
tions for th eg arag ed oor system.
When programmin gag arag ed oor opener, park
th ev eh icle out side th eg arage. Do no tl eave the
engin er unnin gw hile programming.
Certain garag ed oor driv es are incompatib le
wit ht he integrate dg arag ed oor opener. If you
have diff icult yp rograming th ei ntegrate dg arage
door opener, contact aM ercedes-Ben zS ervice
Center.
Alternatively, you can call th ef oll owin gt el e-
phon ea ssistance services:R
USA: Mercedes-Ben zC ustome rA ss istance
Cente rat1 -800-FOR -M ERCe desR
Canada: Custome rS ervic ea t
1-800-387-0100 R
HomeLink ®
hot lin e1 -800-355-351 5( free of
charge)
Mor ei nformatio nonH omeLink ®
and/or com-
pat ible product sisa lso availab le on lin ea t
http:/ /www. hom elin k.co m.
Notes on the declaration of conformity
( Y
page 27).
USA: FCC ID: CB2HMIHL4
Canada: IC: 279B-HMIHL4 Important safety notes
G WARNING
When you operate or program the garag ed oor
with the integrated garag ed oor opener, per-
sons in the range of movement of the garage
door can become trapped or struck by the
garag ed oor. There is ar isk of injury.
When using the integrated garag ed oor
opener, always make sure that nobody is
within the range of movement of the garage
door.
G WARNING
Combustion engines emit poisonou se xhaust
gases such as carbon monoxide. Inhaling
these exhaust gases lead stop oisoning. There
is ar isk of fatal injury. Therefore never leave
the engine running in enclosed spaces with-
out sufficient ventilation.
Programming
Programming the buttons Pay attention to the "Important safety notes"
( Y
page 252).
Garage door remote control