ECU MERCEDES-BENZ CLA 2018 Owner's Guide

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
Front Passenger Air ‐
bag Disabled See
Operator' sM anual The front-passenger air bag and front-passenger knee bag are deac -
tivated during th ej ou rney, although:R
an adult
or R
ap erson of th ec orre spondin gs ta tur eisont he front-passenger seat
If additional force sa re applie dtot he seat ,t he system may interpret
th eo cc upant's weigh tasl ower than it actually is.
G WARNIN G
The front-passenger fron ta ir bag and fron tp assenger knee bag may
no tbet ri ggered in th ee vent of an accident.
There is an increased ris kofi njury.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 ht he ignition off .X
Hav et he occupant on th ef ront-pa ssenger seat get out of th ev ehi-
cle . X
Kee pt he seat unoccupied ,c lose th ef ront-pa ssenger door and
switch on th ei gnition .X
Observ et he PASSENGER AI RB AG indicator lamp sint he center
console and th em ultifunction display and chec kt he following:
Seat unoccupied and ignition switched on :R
as elf-diagnosis is carrie do ut .T he PASSENGER AI RB AG OF Fa nd
PASSENGER AI RB AG ON indicator lamp sm us tl igh tups imulta-
neousl yf or approximately six seconds R
th eP ASSENG ER AI RB AG OF Fi nd icator lamp mus tt he nl igh tu p
and remain lit after th es elf-diagnosis .Ift he indicator lamp is on ,
OCS (Occupant Classification System) has deactivated th ef ront -
passenger fron ta ir bag and front-passenger knee bag
( Y
page 48) R
th e Front Passenger Airbag Enable dS ee Operator' s
Manual or Front Passenger Airbag Disabled See Opera‐
tor's Manual display message sm us tn ot be shown in th em ul-
tifunction display X
Wait for ap eriod of at least 60 seconds until th en eces sar ys ystem
checks hav eb een completed.X
Mak es ur et ha tt he display message sdon ot appear in th em ulti-
function display.
If these condition sa re fulfilled ,t he front-passenger seat can be occu-
pied again .W hether th eP ASSENG ER AI RB AG OF ForONi ndicator
lamp remain sl it or goe so ut depend sonh ow OCS classifies th eo cc u-
pant.
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) .200
Display messages
On-boar dc omputer an dd isplays

Display messages
Possible causes/consequences and P Solutions
Front Passenger Air ‐
bag Enable dS ee
Operator' sM anual The front-passenger air bag and front-passenger knee bag are enabled
during th ej ou rney, eve nt ho ugh :R
ac hi ld, as mall adult or an objec tw eighing less than th es ystem' s
weigh tt hr eshold is locate dont he front-passenger seat
or R
th ef ront-pa ssenger seat is unoccupied
The system may detec to bjects or force sa pplyin ga dditional weigh to n
th es eat .
G WARNIN G
The front-passenger fron ta ir bag and front-passenger knee bag may
be triggered unintentionally.
There is an increased ris kofi njury.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 ht he ignition off .X
Ope nt he front-passenger door .X
Remove th ec hi ld and th ec hi ld restrain ts ystem from th ef ront -
passenger seat .X
Mak es ur et ha tt he re are no objects on th es eat addin gtot he
weight.
The system might otherwise detec tt he additional weigh ta nd inter-
pre tt he seat occupant's weigh tasg reate rt ha nita ctually is.X
Kee pt he seat unoccupied ,c lose th ef ront-pa ssenger door and
switch on th ei gnition .X
Observ et he PASSENGER AI RB AG indicator lamp sint he center
console and th em ultifunction d isplay and chec kt he fo llowing:
Seat unoccupied and ignition switched on :R
as elf-diagnosis is carrie do ut .T he PASSENGER AI RB AG OF Fa nd
PASSENGER AI RB AG ON indicator lamp sm us tl igh tups imulta-
neousl yf or approximately six seconds R
th eP ASSENG ER AI RB AG OF Fi ndicator lamp mus tt he nl igh tu p
and remain lit after th es elf-diagnosis .Ift he indicator lamp is on ,
OCS has deactivated th ef ront-pa ssenger fron ta ir bag and front-
passenger knee bag ( Y
page 48)R
th e Front Passenger Airbag Enable dS ee Operator' s
Manual or Front Passenger Airbag Disabled See Opera‐
tor's Manual display message sm us tn ot be shown in th em ul-
tifunction display X
Wait for ap eriod of at least 60 seconds until th en eces sar ys ystem
checks hav eb een completed.X
Mak es ur et ha tt he display message sdon ot appear in th em ulti-
function display.
If these condition sa re fulfilled ,t he front-passenger seat can be occu-
pied again .W hether th eP ASSENG ER AI RB AG OF ForONi ndicator
lamp remain sl it or goe so ut depend sonh ow OCS classifies th eo cc u-
pant. Display messages 20 1
On-boar dc omputer an dd isplays Z

Display messages
Possible causes/consequences and P Solutions
= See Operator' sM an ‐
ual The battery is no tb ein gc ha rged.
Aw arning tone also sounds.
Possibl ec auses are: R
ad efective alternato rR
at or np oly-V-belt R
am alfunction in th ee lectronics
! Do no tc ontinue driving. The engin ec ou ld otherwise overheat.X
Pull ove ra nd stop th ev ehicl es afely and switch off th ee ng ine, pay-
ing attention to roa da nd traffic conditions.X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Consult aq ualified specialist workshop .
= Sto pV ehicl eS ee
Operator' sM anual The battery is no longer bein gc ha rged and th ec onditi on of charg ei s
to ol ow.
Aw arning tone also sounds. X
Pull ove ra nd stop th ev ehicl es afely and switch off th ee ng ine, pay-
ing attention to roa da nd traffic conditions.X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Observ et he instruction sint he display message = See Oper‐
ator's Manual .X
Consult aq ualified specialist workshop .

Display messages
Possible causes/consequences and P Solutions
Lan e Keepin g Assist
Currently Unavaila‐
ble See Operator' s
Manual Lan eK eepin gA ss is tisd eactivated and temporarily inoperative.
Possibl ec auses are: R
The windshield in th ec amera' sf ield of vision is dirty.R
Visibilit yisi mpaire dd ue to heav yr ain ,s no worf og .R
There hav eb een no lan em arking sf or an extended periodR
The lan em arking sa re wor na way, dark or covered up, e.g. by dir to r
snow
Whe nt he causes state da bov enol onger apply, th ed isplay message
disappears.
Lan eK eepin gA ss is 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
Clean th ew indshield.
Lan e Keepin g Assist
Inoperative Lan eK eepin gA ss is tisf aulty.X
Visit aq ualified specialist workshop .
Blind Spo tA ssist
Currently Unavaila‐
ble See Operator' s
Manual Blind Spot 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 radar sensor system is outside th eo perating temperature
range.
The yellow c indicator lamp sa lso ligh tupint he exterio rm irrors.
Whe nt he causes state da bov enol onger apply, th ed isplay message
disappears.
Blind Spot 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.
Blind Spo tA ssist
Inoperative Blind Spot Assis tisf aulty.
The yellow c indicator lamp sa lso ligh tupint he exterio rm irrors.X
Visit aq ualified specialist workshop .
Parkin gP ilot Can ‐
celed The driver's door is open and th ed river's seat belt has no tb een fas -
tened. X
Repeat th ep arking process wit ht he seat belt fastene da nd th e
driver's door closed .208
Display messages
On-boar dc omputer an dd isplays

Display messages
Possible causes/consequences and P Solutions
You hav ei nadvertentl yt ou ched th em ultifunction steering whee lw hile
steering intervention was active .X
Whil es te ering intervention is active ,m ak es ur et ha tt he multifunc-
tion steering whee lisn ot touched unintentionally.
The vehicl eh as started to skid and ES P ®
has intervened.X
Use Parking Pilo ta gain later ( Y
page 164).
Parkin gP ilot Inop‐
erativ e You hav ej us tc arrie do ut al arg en umber of turnin gorp arking maneu-
vers.
Parking Pilo tw ill become available again after approximately te n
minute s( Y
page 164). 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
Switc ho ff and restar tt he engine.
If th em ultifunction display still shows th ed isplay message :X
Visit aq ualified specialist workshop .
Parking Assis tP AR KTRONI Cism alfunctioning .X
Visit aq ualified specialist workshop .
Parkin gP ilot Fin ‐
ished The vehicl eisp arked. Aw arning tone also sounds.
The display message disappear sa utomatically.
Distance Pilot Off Distanc eP ilo tD ISTR ONI Cisd eactivated ( Y
page 155).
If it was no td eactivated by th ed river ,aw arning tone also sounds.
Distance Pilot Now
Available Distanc eP ilo tD ISTR ONI Ciso perational again after having been tem-
porarily unavailable .Y ou can no wr eactivat eD istance Pilo t
DISTRONI C( Y
page 152).
Distance Pilot Cur ‐
rently Unavailable
See Operator' sM an ‐
ual Distanc eP ilo tD ISTR ONI Cist 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.
Aw arning tone also sounds.
Whe nt he causes state da bov enol onger apply, th ed isplay message
disappears.
Distanc eP ilo tD ISTR ONI Ciso 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. Display messages 20 9
On-boar dc omputer an dd isplays Z

Tires Display messages
Possible causes/consequence sa nd P Solutions
Check Tire Pressure
Soon Canad ao nly:
The tire pressure loss warning system ha sd et ecte das ig nificant loss
in pressure.
Aw ar ning tone also sounds.
Possibl ec auses: R
yo uh av ec hange dt he positions of the wheels and tire sori nstalled
new wheels and tires R
the tire pressure in one or mor et ire sh as dropped
G WARNING
Tire pressures tha ta re too lo wp os et he following hazards:R
the ym ay burst, especially as the load and vehicl es peed increase.R
the ym ay wear excessivel ya nd/or unevenly, which ma yg reatly
impai rt ire traction. R
the drivin gc haracteristics, as well as steerin ga nd braking ,m ay be
greatl yi mpaired.
There is ar is kofana ccident.X
Stop the vehicl ew it hou tm ak ing any sudden steerin gorb raking
maneuvers. Pa ya ttentio ntot he traffi cc onditions as yo udos o.X
Secure the vehicl ea gain st rolling away ( Y
page 141).X
Check the tire sa nd ,ifn ecessary ,f ollo wt he instructions for af lat
tire ( Y
page 271). X
Check the tire pressures and ,ifn ecessary ,c orrect the tire pressure.X
Restart the tire pressure loss warning system when the tire pres-
sure is correct ( Y
page 294).
Check Tire Pressure
The nR estar tR un
Fla tI ndicator Canad ao nly:
The tire pressure loss warning system generated ad isplay message
and ha sn ot been restarted since. X
Set the correct tire pressure in al lf ou rt ires.X
Restart the tire pressure loss warning system ( Y
page 294).
Run Fla tI ndicator
Inoperative Canad ao nly:
The tire pressure loss warning system is faulty. X
Visi taq uali fied specialis tw or kshop.
Please Correct Tire
Pressure USA only:
The tire pressure is too lo winatl east one of the tires, or the tire
pressure differenc eb et ween the wheels is too great.X
Check the tire pressures at the next opportunity ( Y
page 294).X
If necessary ,c orrect the tire pressure.X
Restart the tire pressure monitor ( Y
page 297).Displa ym essages 21 1
On-boar dc omputer an dd isplays Z

Display messages
Possible causes/consequences and P Solutions
Check Tires US Ao nl y:
The tire pressur eino ne or mor et ir es has dropped significantly. The
whee lp osition appear sint he multifunction display.
Aw arning tone also sounds.
G WARNIN G
Tir ep ressures that are to ol ow pos et he followin gh azards :R
they may burst, especially as th el oad and vehicl es peed increase.R
they may wear excessivel ya nd/o ru nevenly, whic hm ay greatl y
impair tire traction .R
th ed rivin gc ha racteristics ,asw ell as steering and braking ,m ay be
greatl yi mpaired.
There is ar is kofana ccident.X
Stop th ev ehicl ew ithout making any sudden steering or braking
maneuvers .P ay attention to th et ra ffic condition sasy ou do so.X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Chec kt he tires and ,ifn eces sary, follow th ei nstruction sf or af lat
tire ( Y
page 271). X
Chec kt he tire pressur e( Y
page 294).X
If necessary, correc tt he tire pressure.
Warnin gT ir eM al ‐
function US Ao nl y:
The tire pressur eino ne or mor et ir es has dropped suddenly. The whee l
position appear sint he multifunction display.
G WARNIN G
Drivin gw it haf lat tire poses ar is koft he followin gh azards :R
af lat tire affects th ea bilit yt os te er or brak et he vehicl eR
you could lose control of th ev ehicl eR
continued drivin gw it haf lat tire will caus ee xces sive heat build-up
and possibl yaf ir e
There is ar is kofana ccident.X
Stop th ev ehicl ew ithout making any sudden steering or braking
maneuvers .P ay attention to th et ra ffic condition sasy ou do so.X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Chec kt he tires and ,ifn eces sary, follow th ei nstruction sf or af lat
tire ( Y
page 271).
Tir e Press. Monito r
Currently Unavaila‐
ble US Ao nl y:
Becaus et he re is interferenc ef ro mas tr on gs ource of radi ow aves, no
signals from th et ir ep ressur es ensor sa re detected. The tire pressur e
monitor is temporarily malfunctioning .X
Drive on .
The tire pressur em onitor restarts automatically as soo nast he
problem has been resolved.212
Display messages
On-boar dc omputer an dd isplays

Display messages
Possible causes/consequences and P Solutions
Transmission Not in
PR is kofV ehicl e
Rollin gA wa y The driver's door is open or no tf ull yc losed and th et ra nsmission is in
position R , N or D .
Aw arning tone also sounds.
G WARNIN G
The vehicl em ay rol la way.
There is ar is kofana ccident.X
Shift th et ra nsmission to position P .X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Clos et he driver's door completely.
Servic e Required Do
Not Shift Gears
Visit Dealer You canno tc ha ng et he transmission position due to am alfunction .
Aw arning tone also sounds.
If transmission position D is selected:X
Drive to aq ualified specialist workshop without shifting th et ra ns -
mission from position D .
If transmission position R , N or P is selected:X
Secur et he vehicl ea gainst rollin ga way ( Y
page 141).X
Notify aq ualified specialist workshop or breakdown service.
Onl yS hift to 'P'
whe n Vehicl e is Sta ‐
tionar y The vehicl eism oving .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
Shift th et ra nsmission to position P .
To Engage Trans‐
miss. Position R
First Depres st he
Brake You hav ea ttempte dtos hift from position D or N to transmission
position R . X
Shift th et ra nsmission to position R while depressing th eb rak e
pedal .
Reversing Not Possi‐
ble Servic e Required The automatic transmission is malfunctioning .Y ou canno tb ac ku p.X
Visit aq ualified specialist workshop .
Transmission Mal ‐
function The automatic transmission is malfunctioning .X
Visit aq ualified specialist workshop .
Transmission Mal ‐
function Sto p The automatic transmission is malfunctioning .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
Consult aq ualified specialist workshop .214
Display messages
On-boar dc omputer an dd isplays

Display messages
Possible causes/consequences and P Solutions
Sto pV ehicl eS hift
to PL eave Engine
Runnin g The automatic transmission has overheated. X
Drive on carefully.
The automatic transmission is available again when th ed isplay
message goe so ut .
If th em ultifunction display still shows th ed isplay message :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
Wait until th ea utomatic transmission has cooled down and th ed is-
play message has disappeared.
Auxiliary Batter y
Malfunction The auxiliary battery for th ea utomatic transmission is no longer bein g
charged. X
Visit aq ualified specialist workshop .X
Unti lt hen, set th et ra nsmission to position P before you switch off
th ee ng ine. X
Befor el eaving th ev ehicle, apply th ee lectric parking brake.
Trans. Oil Overhea‐
ted Drive on wit h
Car e Mercedes-AMG vehicles: th et ra nsmission oil has overheated.
Manual drive progra m M and th et em porarily active manual drive pro -
gra ma re no longer available. The engin ep owe ro utput is reduced.X
Allow th ev ehicl etoc oo ld own .
4matic Currently
Unavailable 4MATIC has overheated. The vehicl eiso nl yd riven by th ef ront wheels.X
Drive on .
The airflow cools 4MATIC mor eq uickly.
Whe nt he display message goe so ut ,4 MATIC is available again and
th ev ehicl eisd riven by all fou rw heels.
4matic Inoperative 4MATIC is malfunctioning .T he vehicl eiso nl yd riven by th ef ront
wheels. X
Visit aq ualified specialist workshop .