light MERCEDES-BENZ GLA-Class 2017 X156 Owner's Manual

Display messagesPossible causes/consequences andMSolutions
b
Check LeftCorner ‐
ing LightorCheck
Right Cornering
Light
The lef tor right-hand cornering ligh tis defective.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
Check LeftLow
Bea morCheck
Right Low Bea m
The leftor right-hand low-beam headlamp is defective.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
Check RearLef t
TurnSignalor
Check Rea rRight
Tur nSignal
The rear left-han dor rear right-hand tur nsignal is defective.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
Check Front Left
TurnSignalor
Check Front Right
Tur nSignal
The fron tleft-han dor fron tright-hand tur nsignal is defective.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
Check LeftMirror
Tur nSignalor
Check
RightMirror
Tur nSignal
The tur nsignal in th eleft-han dor right-hand exterio rmirror is
defective.
XVisit aqualified specialist workshop .
b
CheckCenterBrake
Lamp
The high-mounte dbrak elamp is faulty.
XVisit aqualified specialist workshop .
b
Check LeftBrake
Lam porCheck
Right Brake Lam p
The leftor right-hand brak elamp is defective.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
248Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
b
Check LeftHig h
BeamorCheck
Right Hig hBea m
The lef tor right-hand high beam is defective.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
LicensePlate Lam p
The leftor right-hand license plat elamp is faulty.
XVisit aqualified specialist workshop .
b
Check LeftFog
Lam porCheck Right
Fog Lam p
The leftor right-hand fo glamp is faulty.
XVisit aqualified specialist workshop .
b
Rearfog lam p
The rear fo glamp is faulty.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
Check Front Left
ParkingLam por
Check Front Right
Parkin gLam p
The fron tlef tor fron tright parkin gor standin glamp is defective.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
Backup Light
The backup lamp is defective.
XCheckwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
Check LeftTai l
LamporCheck
Right Tai lLam p
The lef tor right-hand tai llamp is defective.
XVisit aqualified specialist workshop .
Display messages249
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
b
Check Front Left
SidemarkerLam por
Check Front Right
Sidemarke rLam p
The fron tleft-han dor fron tright-hand side marke rlamp is faulty.
XVisit aqualified specialist workshop .
b
Check RearLef t
Sidemarke rLam por
Check Rea rRight
Sidemarke rLam p
The rear left-han dor rear right-hand side marke rlamp is faulty.
XVisit aqualified specialist workshop .
b
CheckLeftDaytim e
RunningLightor
Check Right Day ‐
timeRunnin gLight
The lef tor right-hand daytime running lamp is faulty.
XChec kwhether you are permitte dto replac eth ebulb yourself
(
Ypage 121).
or
XVisit aqualified specialist workshop .
b
Active Headlamps
Inoperative
The active lightfunction is faulty.
XVisit aqualified specialist workshop .
b
Malfunction See
Operator'sManual
The exterio rlighting is defective.
XVisit aqualified specialist workshop .
b
AutoLampFunction
Inoperative
The ligh tsensor is defective.
XVisit aqualified specialist workshop .
b
Switch Off Lights
The lights are still switched on when you leav eth evehicle. A
warnin gtone also sounds.
XTur nth eligh tswitch to th eà position .
b
SwitchOnHeadlamps
You are drivin gwit hlow-beam headlamp sswitched off.
XTur nth eligh tswitch to th eL orà position .
250Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
Â
Key Not Detected
(whitedisplay mes -
sage )
The SmartKey is currentl yundetected.
XChange th elocation of th eSmartKey in th evehicle.
If th eSmartKey still canno tbe detected:
XOperat eth evehicl ewit hth eSmartKey in th eignition lock.
Â
Remove'Start 'But‐
ton and Insert Key
The SmartKey is continually undetected.
KEYLESS-GO is temporarily malfunctionin gor is defective. Awarn -
in g tone also sounds.
XInser tth eSmartKey into th eignition loc kand tur nit to th e
desire dposition .
XVisitaqualified specialist workshop .
Warning and indicator lamps in th einstrument cluste r
General notes
Some systems carry out aself-diagnosi swhen th eignition is switched on .Therefore ,som e
indicato rand warnin glamp smay ligh tup or flas htemporarily. This behavio ris non-critical.
These indicato rand warnin glamp sonly indicate amalfunction if they ligh tup or flas hafter
startin gth eengin eor whils tdriving.
Safet y
Sea tbelt s
ProblemPossible causes/consequences and MSolutions
ü
Afterstartin gth e
engine, th ered seat
belt warnin glamp lights
up fo r 6seconds.The seat belt warnin glamp reminds th edriver and fron tpassenger
to faste ntheir seat belts.
XFaste nyour seat belt (Ypage 46).
ü
Afterstartin gth e
engine, th ered seat
belt warnin glamp lights
up. In addition , awarn -
in g tone sounds fo rup
to 6seconds.The driver's seat belt is no tfastened.
XFaste nyour seat belt (Ypage 46).
The warnin gtone ceases .
266Warning and indicator lamps in the instrument cluster
On-board computer and displays

ProblemPossible causes/consequences andMSolutions
ü
The red seat belt warn-
ing lamp lights up after
the engine starts, as
soon as the driver's or
the front-passenger
door is closed.The driver or front passenger has not fastened their seat belt.
XFasten your seat belt (Ypage 46).
The warning lamp goes out.
There are objects on the front-passenger seat.
XRemove the objects from the front-passenger seat and stow
them in a secure place.
The warning lamp goes out.
ü
The red seat belt warn-
ing lamp flashes and an
intermittent audible
warning sounds.The driver or front passenger has not fastened their seat belt. The
vehicle is being driven faster than 15 mph (25 km/h) or has briefly
been driven faster than 15 mph (25 km/h).
XFasten your seat belt (Ypage 46).
The warning lamp goes out and the intermittent warning tone
ceases.
There are objects on the front-passenger seat. The vehicle is being
driven faster than 15 mph (25 km/h) or has briefly been driven
faster than 15 mph (25 km/h).
XRemove the objects from the front-passenger seat and stow
them in a secure place.
The warning lamp goes out and the intermittent warning tone
ceases.
Warning and indicator lamps in the instrument cluster267
On-board computer and displays
Z

Safety systems
ProblemPossible causes/consequences andMSolutions
J
The yellow brake sys-
tem warning lamp
lights up while the
engine is running.The brake system is malfunctioning.
GWARNING
The braking characteristics may be affected.
There is a risk of an accident.
XDrive on taking extra care.
XVisit a qualified specialist workshop immediately.
$(USA only)
J (Canada only)
The red brake system
warning lamp comes on
while the engine is run-
ning. A warning tone
also sounds.GWARNING
The brake boosting effect is malfunctioning and the braking char-
acteristics may be affected.
There is a risk 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 171).
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction
display.
$ (USA only)
J (Canada only)
The red brake system
warning lamp comes on
while the engine is run-
ning. A warning tone
also sounds.There is not enough brake fluid in the brake fluid reservoir.
GWARNING
The braking effect may be impaired.
There is a risk 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 171).
XDo not add brake fluid. Adding more will not remedy the mal-
function.
XConsult a qualified specialist workshop.
XObserve the additional display messages in the multifunction
display.
268Warning and indicator lamps in the instrument cluster
On-board computer and displays

ProblemPossible causes/consequences andMSolutions
!
The yellow ABS warning
lamp is lit while the
engine is running.ABS is temporarily unavailable. Therefore, BAS, COLLISION PRE-
VENTION ASSIST PLUS, ESP®, EBD (electronic brake force distri-
bution), the HOLD function and hill start assist are also deactiva-
ted, for example.
Possible causes are:
RSelf-diagnosis is not yet complete.
RThe on-board voltage may 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 could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP
®is not operational, ESP®is unable to stabilize the vehicle.
There is a risk of an accident.
XCarefully drive a suitable distance, making slight steering move-
ments at a speed 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 additional display messages in the multifunction
display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
270Warning and indicator lamps in the instrument cluster
On-board computer and displays

ProblemPossible causes/consequences andMSolutions
֌
The yellow ESP
®and
ESP®OFF warning
lamps are lit while the
engine is running.
ESP®, BAS, COLLISION PREVENTION ASSIST PLUS, the HOLD
function and hill start assist are not available due to a malfunction.
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 additional display messages in the multifunction
display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
֌
The yellow ESP
®and
ESP®OFF warning
lamps are lit while the
engine is running.
ESP®, BAS, the HOLD function and hill start assist are temporarily
unavailable.
COLLISION PREVENTION ASSIST PLUS may also have failed.
ATTENTION ASSIST is deactivated.
Self-diagnosis is not 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 a suitable distance, making slight steering move-
ments at a speed 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 additional display messages in the multifunction
display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
Warning and indicator lamps in the instrument cluster273
On-board computer and displays
Z

ProblemPossible causes/consequences andMSolutions
F(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 additional display messages in the multifunction
display.
6
The red restraint sys-
tem warning lamp is lit
while the engine is run-
ning.The restraint system is faulty.
GWARNING
The air bags or Emergency Tensioning Devices may either be trig-
gered unintentionally or, in the event of an accident, may not be
triggered.
There is an increased risk of injury.
XObserve the additional display messages in the multifunction
display.
XDrive on carefully.
XContact a qualified specialist workshop and have the restraint
system checked.
For further information about the restraint system, see
(
Ypage 42).
274Warning and indicator lamps in the instrument cluster
On-board computer and displays

Engine
ProblemPossible causes/consequences andMSolutions
;
The yellow Check
Engine warning lamp
lights up while the
engine is running.There may be a malfunction, for example:
Rin the engine management
Rin the fuel injection system
Rin the exhaust system
Rin the ignition system
Rin the fuel system
The emission limit values may be exceeded and the engine may be
in emergency mode.
XVisit a qualified specialist workshop immediately.
iIn some states, you must immediately visit a qualified special-
ist workshop as 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 whether such legal regulations apply in the state in which you are currently driving.
æ
The yellow reserve fuel
warning lamp lights up
while the engine is run-
ning.The fuel level has dropped into the reserve range.
XRefuel at the nearest gas station.
æ
The yellow reserve fuel
warning lamp flashes
while the vehicle is in
motion.
In addition, the ;
Check Engine warning
lamp may light up.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.
XIf the fuel filler cap is not correctly closed: close the fuel filler
cap.
XIf the fuel filler cap is closed: visit a qualified specialist work-
shop.
?
The red coolant warn-
ing lamp lights up while
the engine is running
and the coolant tem-
perature gage is at the
start of the scale.The temperature sensor for the coolant temperature gage is defec-
tive.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
XPull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions. Do not continue
driving under any circumstances.
XSecure the vehicle against rolling away (Ypage 171).
XConsult a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster275
On-board computer and displays
Z