2018 MERCEDES-BENZ CLA COUPE instrument cluster

Warning and indicator lamps in the instrument cluster
General notes
Some systems carry outaself-diagnosis when the ignition is switched on. Therefore, some indicator
and warning lamps may light up or flas htemporarily .This behavior is non-critical.
These indicator and warning lamps only indicate amalfunction if they light up or flas hafter starting
the engine or whilst driving.
Safety
Seat belts
Warning/
indicator
lampNSignal type
Possiblec auses/consequence sand M
Solutions
üNAfter engine start, the red seatb eltwarning lam plights up for six seconds.
The seatb eltwarning lam preminds the drivera nd front passenger to fasten their
seatb elts.
XFasten you rseatb elt(Ypage44).
üNAfter starting the engine, the red seatb eltwarning lam plights up. In addition, a
warning tone sound sfor up to six seconds.
The driver's seatb eltisnot fastened.
XFasten you rseatb elt(Ypage44).
The warning tone ceases.
üN The red seatb eltwarning lam plights up after the engine starts, as soon as the
driver's or the front-passenger door is closed.
The driverorf ront passenger has not fastened their seatb elt.
XFasten yourseatb elt(Ypage44).
The warning lam pgoes out.
There are objects on the front-passenger seat.
XRemove the objects from the front-passenger seata nd stow them inasecure
place.
The warning lam pgoes out.
üNThe red seatb eltwarning lam pflashes and an intermittent audible warning
sounds.
The driverorf ront passenger has not fastened their seatb elt. The vehicleisbeing
drivenf aster than 15 mph (25 km/h )orhas briefly been drivenf aster than 15 mph
(25 km/h).
XFasten you rseatb elt(Ypage44).
The warning lam pgoes out and the intermittent warning tone ceases.
There are objects on the front-passenger seat. The vehicleisb eing drivenfaster
than 15 mph (25 km/h )orhas briefly been drivenf aster than 15 mph (25 km/h).
XRemove the objects from the front-passenger seata nd stow them inasecure
place.
The warning lam pgoes out and the intermittent warning tone ceases.
218Warning and indicator lamps in the instrument cluster
On-board computer and displays

Safety systems
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
$JN$ (USA only), J(Canada only): the red brake system warning lamp is lit
while the engine is running. Awarning tone also sounds.
GWARNING
The brake boosting effect is malfunctioning and the braking characteristics may be
affected.
There is arisk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 141).
XConsult aqualified specialist workshop.
XObserve the additional display messages in the multifunction display.
$JN$ (USA only), J(Canada only): the red brake system warning lamp is lit
while the engine is running. Awarning tone also sounds.
There is not enough brake fluid in the brake fluid reservoir.
GWARNING
The braking effect may be impaired.
There is arisk of an accident.
XPull over and stop the vehicle safely as soon as possible, paying attention to road
and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 141).
XDo not add brake fluid. Adding more will not correct the malfunction.
XConsult aqualified specialist workshop.
XObserve the additional display messages in the multifunction display.
Warning and indicator lamp sinthe instrument cluster219
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
!NThe yellow ABS warning lamp is lit while the engine is running.
ABS (Anti-lock Braking System) is deactivated due to amalfunction. Therefore,
BAS (Brake Assist), Active Brake Assist, ESP
®(Electronic Stability Program), the
HOLD function and hills tart assist, for example, are als odeactivated.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listed
above. The wheels coul dtherefore lock if you brake hard ,for 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 ,ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XObserve the additionald isplay messages in the multifunction display.
XDrive on carefully.
XVisitaqualified specialist workshopi mmediately.
If the ABS control unit is faulty, there is als oapossibility that other systems ,such
as the navigation system or the automatic transmission, wil lnot be available.
!N The yellow ABS warning lamp is lit while the engine is running.
ABS is temporarily unavailable.T herefore, BAS, Active Brake Assist, ESP®,EBD
(electronic brake force distribution), the HOLD function and hills tart assist, for
example, are als odeactivated.
Possible causes are:
RSelf-diagnosi sisnot yet complete.
RThe on-board voltag emay be insufficient.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listed
above. The front and rear wheels coul dtherefore lock if you brake hard ,for 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 ,ESP®is unable to stabilize the vehicle.
There is arisk of an accident.
XCarefully drive asuitable distance, making slight steering movements at aspeed
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:
XObserve the additiona ldisplay messages in the multifunction display.
XDrive on carefully.
XVisitaq ualified specialist workshopi mmediately.
220Warning and indicator lamps in the instrument cluster
On-board computer and displays

Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
!NThe yellow ABS warning lamp is lit while the engine is running. Awarning tone
als os ounds.
EBD is malfunctioning. Therefore, ABS, BAS, Active Brake Assist, ESP
®,t he HOLD
function and hills tart assist, for example, are not available either.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listed
above. The front and rear wheels coul dtherefore lock if you brake hard ,for 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 ,ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XObserve the additionald isplay messages in the multifunction display.
XDrive on carefully.
XVisitaqualified specialist workshopi mmediately.
!
֌
$JN$(USA only), J(Canada only): the red brake warning lamp and the yellow
ABS, ESP®and ESP®OFF warning lamp sare lit while the engine is running.
ABS and ESP®are malfunctioning. Therefore, BAS, Active Brake Assist, EBD, the
HOLD function and hills tart assist, for example, are not available either.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listed
above. The front and rear wheels coul dtherefore lock if you brake hard ,for 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 ,ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XObserve the additionald isplay messages in the multifunction display.
XDrive on carefully.
XVisitaqualified specialist workshopi mmediately.
Warning and indicator lamps in the instrument cluster221
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
÷NThe yellow ESP®warning lamp flashes while the vehicleisinm otion.
ESP®or traction control has intervened because there is arisk of skidding or at
least one wheelh as started to spin.
Cruise control or Distance Pilot DISTRONIC is deactivated.
XWhen pulling away, only depress the accelerator pedalasf ar as necessary.
XEase off the accelerator pedalwhile the vehicleisinmotion.
XAdapt yourdriving style to sui tthe road and weather conditions.
XDo not deactivate ESP®.
In rare cases (
Ypage6 6),itm ay be best to deactivate ESP®.
Observe the important safety notes on ESP®(Ypage6 4).
åNThe yellow ESP®OFF warning lamp is lit while the engine is running.
ESP®is deactivated. ESP®wil lnot stabilize the vehicleifits tarts to skid or if a
wheels tarts to spin.
GWARNING
If ESP
®is switched off, ESP®is unable to stabilize the vehicle.
Further driving systems or driving safety systems are thus restricted.
There is an increased risk of skidding and an accident.
XReactivate ESP®.
In rare cases (
Ypage6 6),itm ay be best to deactivate ESP®.
Observe the important safety notes on ESP®(Ypage6 4).
XAdapt you rdriving style to sui tthe road and weather conditions.
If ESP
®cannot be activated:
XDrive on carefully.
XContact aqualified specialist workshopa nd have ESP®checked.
MNMercedes-AMG vehicles only:
The yellow SPORT handling mode warning lamp is lit while the engine is running.
SPORT handling mode is activated.
GWARNING
When SPORT handling mode is switched on, ESP
®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XOnly switch to SPORT handling mode in accordance with the conditions descri-
bed in the "Activating/deactivating ESP®"s ection (Ypage6 6).
222Warning and indicator lamps in the instrument cluster
On-board computer and displays

Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
÷åNThe yellow ESP®and ESP®OFF warning lamp sare lit while the engine is running.
ESP®,B AS, Active Brake Assist, the HOLD function and hills tart assist are not
available due to amalfunction.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listed
above.
The braking distance in an emergency braking situation can thus increase.
If ESP
®is not operational ,ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XObserve the additiona ldisplay messages in the multifunction display.
XDrive on carefully.
XVisitaq ualified specialist workshopi mmediately.
÷åNThe yellow ESP®and ESP®OFF warning lamp sare lit while the engine is running.
ESP®,B AS, the HOLD function and hills tart assist are temporarily unavailable.
Active Brake Assist may have als ofailed.
ATTENTION ASSIST is deactivated.
Self-diagnosi sisnot yet complete.
GWARNING
The brake system continues to function normally, but without the functions listed
above.
The braking distance in an emergency braking situation can thus increase.
If ESP
®is not operational ,ESP®is unable to stabilize the vehicle.
There is an increased risk of skidding and an accident.
XCarefully drive asuitable distance, making slight steering movements at aspeed
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:
XObserve the additiona ldisplay messages in the multifunction display.
XDrive on carefully.
XVisitaq ualified specialist workshopi mmediately.
Warning and indicator lamps in the instrument cluster223
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
!FNF (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.
XObserve the additiona ldisplay messages in the multifunction display.
6N The red restraint system warning lamp is lit while the engine is running.
The restraint system is malfunctioning.
GWARNING
The air bagsorE mergency Tensioning Devices may either be triggeredu ninten-
tionally or, in the event of an accident, may not be triggered.
There is an increased risk of injury.
XObserve the additionald isplay messages in the multifunction display.
XDrive on carefully.
XContactaqualified specialist workshopa nd have the restraint system checked.
For further information about the restraint system, see (
Ypage4 0).
Engine
Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
;NThe yellow Check Engine warning lamp lights up while the engine is running.
There may be amalfunction, for example:
Rin the engine management
Rin the fuel injection system
Rin the exhaust system
Rin the ignitio nsystem
Rin the fuel system
The emission limitv alues may be exceededa nd the engine may be in emergency
mode.
XVisitaq ualified specialist workshopi mmediately.
iIn some states, you must immediatel yvisit aqualified specialist workshopa s
soon as the yellow Check Engine warning lamp lights up. This is due to the legal
requirements in effect in these states. If in doubt, check whethers uch legal
regulations apply in the state in which you are currently driving.
æN The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel levelh as dropped into the reserve range.
XRefuel at the neares tgas station.
224Warning and indicator lamps in the instrument cluster
On-board computer and displays

Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
æNThe yellow reserve fuel warning lamp flashes while the vehicleisinm otion.
In addition, the ;Check Engine warning lamp may light up.
The fuel filler cap is not closed correctly or the fuel system is leaking.
XCheck that the fuel filler cap is correctly closed.
XIf the fuel filler cap is not correctly closed: close the fuel filler cap.
XIf the fuel filler cap is closed:visitaqualified specialist workshop.
?NThe red coolant warning lamp lights up while the engine is running and the
coolant temperature gage is at the start of the scale.
The temperature sensor for the coolant temperature gauge is malfunctioning.
The coolant temperature is no longer being monitored.T here isarisk of engine
damage if the coolant temperature is too high.
XPul lover and stop the vehicles afelyand switch off the engine, paying attention
to road and traffic conditions. Do not continue driving under any circumstances.
XSecure the vehiclea gainst rolling away(Ypage141).
XConsult aqualified specialist workshop.
Warning and indicator lamps in the instrument cluster225
On-board computer and displays
Z