ecu MERCEDES-BENZ CLA-Class 2016 C117 Service Manual

Display messagesPossible causes/consequences andMSolutions
Front Passenger
Airbag Disabled
SeeOperator'sMan‐
ual
The front-passenger air bag and front-passenger knee bag are
deactivated during th ejourney, although:
Ran adult
or
Raperson of th ecorrespondin gstature is on th efront-passenger
seat
If additional forces are applied to th eseat ,th esystem may inter-
pre tth eoccupant's weight as lowe rthan it actually is.
GWARNIN G
The front-passenger fron tair bag and fron tpassenger knee bag
may no tbe triggered in th eevent of an accident.
There is an increase dris kof injury.
XPull ove rand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 169).
XSwitchth eignition off.
XHav eth eoccupant get out of th evehicle.
XKee pth eseat unoccupied ,close th efront-passenger doo rand
switch on th eignition .
XObserveth ePASSENGER AI RBA Gindicato rlamp sin th ecenter
console and th emultifunction display and chec kth efollowing :
Seat unoccupied and ignition switched on :
Raself-diagnosi sis carrie dout .The PASSENGER AI RBA GOF F
and PASSENGER AI RBA GON indicato rlamp smus tligh tup
simultaneousl yfo rapproximately six s
econds
RthePASSENGER AI RBA GOF Findicato rlamp mus tthen ligh t
up and remain lit after th eself-diagnosis. If th eindicato rlamp
is on ,OCS (Occupant Classification System) has disabled th e
front-passenger fron tair bag and front-passenger knee bag
(
Ypage 51)
Rth eFront Passenger Air Bag Enable dSee Opera‐
tor's Manualor Front Passenger Air Bag Disabled
See Operator' sManualdisplay message smus tno tbe
shown in th emultifunction display
XWait fo r aperiod of at leas t60 seconds until th enecessar ysys-
te m checks hav ebeen completed.
XMak esur ethat th edisplay message sdo no tappea rin th emul-
tifunction display.
If these condition sare fulfilled ,th efront-passenger seat can be
occupied again .Whether th ePASSENGER AI RBA GOF For ON
Display messages23 7
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
indicatorlamp remain slit or goe sout depend son how OCS clas-
sifies th eoccupant .
If th econdition sare no tfulfilled ,th esystem is no toperating cor-
rectly.
XVisit aqualified specialist workshop immediately.
Fo rfurther information about th eOccupant Classification System,
see (
Ypage 51) .
Front Passenger
AirbagEnabledSee
Operator' sManual
The front-passenger air bag and front-passenger knee bag are
enabled during th ejourney, eve nthough :
Rachild, asmall adult or an objec tweighin gless than th esys-
tem' sweight threshold is locate don th efront-passenger seat
or
Rth efront-passenger seat is unoccupied
The system may detec tobjects or forces applying additional
weight on th eseat .
GWARNIN G
The front-passenger fron tair bag and front-passenger knee bag
may be triggered unintentionally.
There is an increase dris kof injury.
XPull ove rand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 169).
XSwitchth eignition off.
XOpe nth efront-passenger door.
XRemove th echild and th echild restrain tsystem from th efront-
passenger seat .
XMakesur ethat there are no objects on th eseat addin gto th e
weight .
The system may otherwise detec tth eadditional weight and
interpret th eseat occupant's weight as greate rthan it actually
is.
XKee pth eseat unoccupied ,close th efront-passenger doo rand
switch on th eignition .
XObserveth ePASSENGER AI RBA Gindicato rlamp sin th ecenter
console and th emultifunction display and chec kth efollowing :
238Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
?
CoolantToo Hot
Sto pVehicl eTur n
Engine Off
The coolan tis to ohot .
A warnin gtone also sounds.
GWARNIN G
Do notdrive when your engin eis overheated. This can caus esom e
fluids whic hmay hav eleaked into th eengin ecompartmen tto
catch fire.
Steam from th eoverheated engin ecan also caus eserious burn s
whic hcan occur jus tby openin gth ehood.
There is aris kof injury.
XPull ove rand stop th evehicl esafely and switch of fth eengine,
payin gattention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 169).
XWait until th eengin ehas cooled down .
XMakesur ethat th eair supply to th eengin eradiato ris no t
blocked, e.g. by snow, slus hor ice .
XDo no tstart th eengin eagain until th edisplay message goe sout
and th ecoolan ttemperature is belo w24 8 ‡ (120†). Other -
wise ,th eengin ecould be damaged.
XPay attention to th ecoolan ttemperature display.
If th etemperatur eincreases again:
XVisit aqualified specialist workshop immediately.
Under normal operating condition sand wit hth especified coolan t
level, th ecoolan ttemperature may ris eto 24 8 ‡(120†) .
#
SeeOperator'sMan‐
ual
Thebattery is not being charged.
A warning tone also sounds.
Possible causes are:
Ra defective alternator
Ra torn poly-V-belt
Ra malfunction in the electronics
!Do not continue driving. The engine could otherwise overheat.
XPull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypage 169).
XConsult a qualified specialist workshop.
244Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
#
StopVehicl eSee
Operator' sManual
The battery is no longer bein gcharged and th ebattery charg elevel
is to olow.
A warnin gtone also sounds.
XPull ove rand stop th evehicl esafely and switch of fth eengine,
payin gattention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 169).
XObserv eth einstruction sin th edisplay message #See
Operator' sManual.
XConsult aqualified specialist workshop .
4
Check Engine Oil
At NextRefueling
The engin eoil level has dropped to th eminimum level.
A warnin gtone also sounds.
!Avoid lon gjourneys wit hto olittl eengin eoil. The engin ewill
otherwise be damaged.
XChec kth eoil level when next refueling, at th elatest
(
Ypage 298).
XIf necessary, add engin eoil (Ypage 298).
If th eengin eoil need stopping up more often:
XContac t aqualified specialist workshop and hav eth eengin e
checked.
Information on approve dengin eoils can be obtained from any
qualified specialist workshop or on th eInternet at http:/ /
bevo.mercedes-benz.co m.
æ
Fuel Level Low
The fuel level has dropped into the reserve range.
XRefuel at the nearest gas station.
çThere is only a very small amount of fuel in the fuel tank.
XRefuel at the nearest gas station without fail.
æ
Gas Cap Loose
The fuel system pressure is too low. The fuel filler cap is not closed
correctly or the fuel system is leaking.
XCheck that the fuel filler cap is correctly closed.
If the fuel filler cap is not correctly closed:
XClose the fuel filler cap.
If the fuel filler cap is correctly closed:
XVisit a qualified specialist workshop.
Display messages245
On-board computer and displays
Z

Drivingsystems
Display messagesPossible causes/consequences an dMSolutions
À
Attention Assist :
Take a Break!
Based on certain criteria, ATTENTION ASSIST has detecte dfatigue
or alac kof concentration on th epar tof th edriver . Awarnin gtone
also sounds.
XIf necessary, take abreak .
Durin glon gjourneys, take regular break sin goo dtime so you get
enough rest.
À
Attention Assist
Inoperative
ATTENTION ASSIST is inoperative .
XVisitaqualified specialist workshop .
ë
Off
The HOLD function is deactivated. The vehicle is skidding .
A warnin gtone also sounds.
XReactivat eth eHOLD function later (Ypage 187).
The HOLD function is deactivated. Whe nth ebrake peda lis firmly
depressed, an activation condition is no tfulfilled .
A warnin gtone also sounds.
XChec kth eactivation condition sfo rth eHOLD function
(
Ypage 187).
Lan eKeepin g
Assist Currently
Unavailable See
Operator' sManual
Lan eKeepin gAssis tis deactivated and temporarily inoperative .
Possible causes are :
Rthewindshield in th ecamera's field of vision is dirty.
Rvisibility is impaire ddue to heav yrain ,snow or fog.
Rthere hav ebeen no lan emarking sfo ran extended period.
Rth elan emarking sare worn, dar kor covered, e.g. by dir tor snow.
Whe nth ecauses stated abov eno longer apply, th edisplay mes -
sage disappears .
Lan eKeepin gAssis tis operational again .
If th edisplay message doe sno tdisappear:
XPull over and stop th evehicle safely as soo nas possible, payin g
attention to road and traffic conditions.
XSecur eth evehicle against rollin gaway (Ypage 169).
XClean th ewindshield .
LaneKeepin g
Assist Inoperative
LaneKeepin gAssis tis faulty.
XVisit aqualified specialist workshop .
246Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
Blind SpotAssist
Currently Unavail‐
abl eSee Opera‐
tor's Manual
Blind Spot Assis tis temporarily inoperative.
Possibl ecauses are:
Rth erada rsensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radi osta-
tion sor other source sof electromagnetic radiation .
Rtherada rsensor system is outside th eoperating temperature
range.
The yello w9 indicato rlamp salso ligh tup in th eexterio rmir -
rors.
Whe nth ecauses state dabov eno longer apply, th edisplay mes -
sage disappears.
Blind Spot Assis tis operational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 169).
XRestart th eengine.
Blind Spo tAssist
Inoperative
Blind Spot Assis tis defective.
The yello w9 indicato rlamp salso ligh tup in th eexterio rmir -
rors.
XVisit aqualified specialist workshop .
ParkAssist Can ‐
celed
The driver's doo ris open and th edriver's seat belt has no tbeen
fastened.
XRepea tth eparkin gprocess wit hth eseat belt fastene dand th e
driver's doo rclosed .
You hav einadvertentl ytouched th emultifunction steerin gwhee l
while steerin gintervention was active .
XWhilesteerin gintervention is active ,mak esur ethat th emulti-
function steerin gwhee lis no ttouched unintentionally.
The vehicl ehas started to skid and ES P®has intervened.
XUse Active Parking Assistagain later (Ypage 195).
Display messages247
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
ParkAssistInoper ‐
ative
You hav ejus tcarrie dout alarg enumber of turning or parkin g
maneuvers .
Active Parking Assis twill become available again after approx -
imately te nminute s (
Ypage 195).
XPull ove rand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSwitc hof fand restar tth eengine.
If th emultifunction display still shows th edisplay message :
XVisitaqualified specialist workshop .
PARKTRONICis defective.
XVisit aqualified specialist workshop .
ParkAssist Fin ‐
ished
The vehicleis parked. Awarnin gtone also sounds.
The display message disappear sautomatically.
DISTRONIC PLU SOffDISTRONIC PLU Shas been deactivated (Ypage 180).
If it was no tdeactivated by th edriver , awarnin gtone also sounds.
DISTRONICPLU SNow
Available
DISTRONIC PLU Sis operational again after havin gbeen tempo -
rarily unavailable .You can no wreactivat eDISTRONIC PLU S
(
Ypage 180).
DISTRONICPLU SCur‐
rentlyUnavailable
SeeOperator' sMan‐
ual
DISTRONIC PLU Sis temporarily inoperative.
Possibl ecauses are:
Rth erada rsensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radi osta-
tion sor other source sof electromagnetic radiation .
Rthesystem is outside th eoperating temperature range.
Rth eon-boar dvoltag eis to olow.
A warnin gtone also sounds.
Whe nth ecauses state dabov eno longer apply, th edisplay mes -
sage disappears.
DISTRONIC PLU Sis operational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 169).
XRestart th eengine.
248Display messages
On-board computer and displays

Tires
Display messagesPossible causes/consequences andMSolutions
Check Tire Pres‐
sure Soon
Canada only:
The tire pressure loss warning system has detected a significant
loss in pressure.
A warning tone also sounds.
Possible causes:
Ryou have changed the positions of the wheels and tires or instal-
led new wheels and tires.
Rthe tire pressure in one or more tires has dropped
GWARNING
Tire pressures that are too low pose the following hazards:
Rthey may burst, especially as the load and vehicle speed
increase.
Rthey may wear excessively and/or unevenly, which may greatly
impair tire traction.
Rthe driving characteristics, as well as steering and braking, may
be greatly impaired.
There is a risk of an accident.
XStop the vehicle without making any sudden steering or braking
maneuvers. Pay attention to the traffic conditions as you do so.
XSecure the vehicle against rolling away (Ypage 169).
XCheck the tires and, if necessary, follow the instructions for a
flat tire (
Ypage 310).
XCheck the tire pressures and, if necessary, correct the tire pres-
sure.
XRestart the tire pressure loss warning system when the tire
pressure is correct (
Ypage 336).
Check Tire Pres‐
sure Then Restart
Run Flat Indicator
Canada only:
The tire pressure loss warning system generated a display mes-
sage and has not been restarted since.
XSet the correct tire pressure in all four tires.
XRestart the tire pressure loss warning system (Ypage 336).
RunFlatIndicator
Inoperative
Canada only:
The tire pressure loss warning system is faulty.
XVisit a qualified specialist workshop.
250Displa y messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
Please Correct
TirePressure
US Aonly:
The tire pressur eis to olow in at leas ton eof th etires ,or th etire
pressur edifference between th ewheels is to ogreat.
XChec kth etire pressures at th enext opportunity (Ypage 336).
XIf necessary, correc tth etire pressure.
XRestart th etire pressur emonitor (Ypage 338).
Check TiresUSAonly:
The tire pressur ein on eor mor etires has dropped significantly.
The whee lposition appears in th emultifunction display.
A warnin gtone also sounds.
GWARNIN G
Tirepressures that are to olow pos eth efollowing hazards :
Rthey may burst, especially as th eload and vehicl espeed
increase .
Rthey may wear excessivel yand/o runevenly, whic hmay greatl y
impair tire traction .
Rthedrivin gcharacteristics ,as well as steerin gand braking, may
be greatl yimpaired.
There is aris kof an accident.
XStop th evehicl ewithout makin gany sudden steerin gor brakin g
maneuvers .Pay attention to th etraffic condition sas you do so.
XSecur eth evehicl eagainst rollin gaway (Ypage 169).
XCheckth etires and ,if necessary, follow th einstruction sfo r a
flat tire (
Ypage 310).
XCheckth etire pressur e (Ypage 336).
XIf necessary, correc tth etire pressure.
Display messages25 1
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
WarningTir eMal ‐
function
USAonly:
The tire pressur ein on eor mor etires has dropped suddenly. The
whee lposition appears in th emultifunction display.
GWARNIN G
Drivingwit h a flat tire poses aris kof th efollowing hazards :
Raflat tire affects th eabilit yto steer or brak eth evehicle.
Ryou could los econtrol of th evehicle.
Rcontinued drivin gwit h a flat tire will caus eexcessive heat build-
up and possibl y afire.
There is aris kof an accident.
XStop th evehicl ewithout makin gany sudden steerin gor brakin g
maneuvers .Pay attention to th etraffic condition sas you do so.
XSecur eth evehicl eagainst rollin gaway (Ypage 169).
XCheckth etires and ,if necessary, follow th einstruction sfo r a
flat tire (
Ypage 310).
TirePress. Moni‐
tor Currently
Unavailable
US Aonly:
Becaus ethere is interferenc efrom astron gsource of radi owaves,
no signal sfrom th etire pressur esensor sare detected. The tire
pressur emonitor is temporarily malfunctioning.
XDrive on .
The tire pressur emonitor restarts automatically as soo nas th e
problem has been resolved.
TirePress .Sen ‐
sor(s) Missin g
USAonly:
There is no signal from th etire pressur esensor of on eor several
wheels. The pressur eof th eaffecte dtire does no tappea rin th e
multifunction display.
XHav eth efault ytire pressur esensor replaced at aqualified spe -
cialist workshop .
TirePressure Mon ‐
itorInoperative
No Wheel Sensor s
USAonly:
The wheels mounted do no thav e a suitable tire pressur esensor .
The tire pressur emonitor is deactivated.
XMoun twheels wit hsuitable tire pressur esensors.
The tire pressur emonitor is activated automatically after drivin g
fo r a few minutes.
Tir ePress. Moni‐
tor Inoperative
US Aonly:
The tire pressur emonitor is faulty.
XVisit aqualified specialist workshop .
252Display messages
On-board computer and displays