2017 MERCEDES-BENZ GLS-Class SUV warning light

Display messagesPossible causes/consequences andMSolutions
XVisitaqualified specialist workshop immediately.
Fo rfurther information about th eOccupant Classification System, see
(
Ypage 49).
Lights
i
Vehicles wit hLE Dbulbs in th eligh tclusters :
The display message for th ecorrespondin glamp only appear swhen all of th eLEDs in th elamp
hav efailed.
Display messagesPossible causes/consequences and MSolutions
b
Check LeftLowBea m(Example)
The bulb in question is malfunctioning .
XVisitaqualified specialist workshop .
or
XChec kwhether you are permitte dto replace th ebulb yourself
(Ypage 117).
b
Active HeadlampsInoperative
The active ligh tfunction is faulty.
XVisit aqualified specialist workshop .
b
Malfunction SeeOperator'sManual
The exterio rlighting is malfunctioning .
XVisitaqualified specialist workshop .
Vehicles withtrailer to whitch : afusemay hav eblown .
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 159).
XCheckth efuses (Ypage 343).
XIf necessary, replace th eblown fuse. Observ eth ewarning notes.
If th emultifunction display still shows th edisplay message :
XVisitaqualified specialist workshop .
b
Malfunction SeeOperator'sManual
The exterio rlighting is malfunctioning .
XVisitaqualified specialist workshop .
b
AutoLam pFunctionInoperative
The ligh tsensor is defective.
XVisit aqualified specialist workshop .
b
Switch Off Lights
You leaveth evehicl eand th elights are switched on . Awarning tone
also sounds.
XTurn th eligh tswitch to th eà position .
256Display messages
On-board computer and displays

Display messagesPossible causes/consequences andMSolutions
Á
Max.Speed 12 mph
You are exceedin gth espeed permissibl efor th eselected off-road
level.
In addition ,th evehicl elevel display appear sabov eth edisplay mes -
sage ,and awarning tone sounds.
GWARNIN G
The vehicl ecould ti pand rollover.
There is aris kof an accident.
XAdjus tyour drivin gstyle to th ealtere dhandlin gcharacteristics .
XOnly makeslight steering movement sand avoid fas tsteering move-
ments .
XDo notexceed 12 mph (20 km/h) until th evehicl ehas reached off -
roa dlevel 2.
Á
Raisin gMax.Speed12 mph
The vehicl eis bein gadjusted to off-road level 3.
In addition ,th evehicl elevel display appear sabov eth edisplay mes -
sage .
The display message refers to th emaximum speed permissibl e
(dependin gon th emodel type) for off-road level 3.
XDo no tdrive at speeds abov e12 mph (20 km/h).
g
LoweringMax .Speed12 mph
The vehicl eis bein glowered from off-road level 3to off-road level 2.
In addition ,th evehicl elevel display appear sabov eth edisplay mes -
sage .
The display message refers to th emaximum speed permissibl e
(dependin gon th emodel type) for off-road level 3.
XDo no texceed 12 mph (20 km/h)until the vehicle has reached off-
road level 2.
ACTIVECURVESYSTEMMalfunctionThe ACTIVE CURVE SYSTEM ismalfunctioning. The vehicle's handlin g
characteristics may beaffected.
XDo not drive at speeds above 50 mph (80 km/h).
XVisit aqualified specialist workshop.
ACTIVECURVESYSTEMMalfunction SeeOperator's Manual
The ACTIVE CURVE SYSTEM ismalfunctioning. The vehicle's handlin g
characteristics are severely impaired. A warning tone also sounds.
GWAR NING
There isa risk of an acc ident.
XDrive on carefully.
XAdjust your driving style to the altered handling characteristics.
XAvoid sudden acceleration around tight corners and fast steering
movements.
XDo not drive at speeds above 50 mph (80 km/h).
XVisit aqualified specialist workshop immediately.
262Display messages
On-board computer and displays

Safety
Seat belts
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
üNAfter starting the engine, the red seat belt warning lamp lights up for 6 seconds.
The seat belt warning lamp reminds the driver and front passenger to fasten their
seat belts.
XFasten your seat belt (Ypage 44).
üN After starting the engine, the red seat belt warning lamp lights up. In addition, a
warning tone sounds for up to 6 seconds.
The driver's seat belt is not fastened.
XFasten your seat belt (Ypage 44).
The warning tone ceases.
üN The red seat belt warning 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 44).
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.
üN The red seat belt warning 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 44).
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 cluster275
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possible causes/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 a malfunction.
Other driving systems and driving safety systems may also malfunction.
In addition, the ÷andå warning lamps may light up in the instrument
cluster.
ATTENTION ASSIST is deactivated.
GWARNING
The brake system continues to function normally, but without the functions listed
above. The wheels could therefore 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 additional display messages in the multifunction display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
If the ABS control unit is faulty, there is also a possibility that other systems, such
as the navigation system or the automatic transmission, will not be available.
Warning and indicator lamps in the instrument cluster277
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
!NThe yellow ABS warning lamp is lit while the engine is running.
ABS is temporarily unavailable.
Other driving systems and driving safety systems may also malfunction.
In addition, the ÷andå warning lamps may light up in the instrument
cluster.
ATTENTION ASSIST is deactivated.
Possible causes are:
RSelf-diagnosis is not yet complete.
RThe on-board voltage may be insufficient.
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 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 a risk of an accident.
XCarefully drive a suitable distance, making slight steering movements 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.
278Warning and indicator lamps in the instrument cluster
On-board computer and displays

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
!NThe yellow ABS warning lamp is lit while the engine is running.
EBD is not available due to a malfunction.
Other driving systems and driving safety systems may also malfunction.
In addition, the ÷andå warning lamps may light up in the instrument
cluster.
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 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 additional display messages in the multifunction display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
$J
֌
!N $ (USA only), J(Canada only): the red brake warning lamp and the yellow
ESP®, ESP®OFF and ABS warning lamps are lit while the engine is running.
ABS and ESP®are malfunctioning.
Other driving systems and driving safety systems may also malfunction.
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 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 additional display messages in the multifunction display.
XDrive on carefully.
XVisit a qualified specialist workshop immediately.
Warning and indicator lamps in the instrument cluster279
On-board computer and displays
Z

Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
÷åNThe yellow ESP®and ESP®OFF warning lamps are lit while the engine is running.
ESP®, BAS, Active Brake Assist, Active Brake Assist with Cross-Traffic Assist,
ESP®trailer stabilization, PRE‑SAFE®, PRE‑SAFE®PLUS, the HOLD function, hill
start assist, Crosswind Assist, STEER CONTROL, Active Lane Keeping Assist and
Active Blind Spot 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.
÷åN The yellow ESP®and ESP®OFF warning lamps are lit while the engine is running.
ESP®, BAS, Active Brake Assist, Active Brake Assist with Cross-Traffic Assist,
ESP®trailer stabilization, PRE‑SAFE®, PRE‑SAFE®PLUS, the HOLD function, hill
start assist, Crosswind Assist, STEER CONTROL, Active Lane Keeping Assist and
Active Blind Spot Assist are not available due to a malfunction.
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 movements 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 cluster281
On-board computer and displays
Z

Engine
Warning/
indicator
lampNSignal type
Possible causes/consequences and M
Solutions
;NThe 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 (for vehicles with gasoline engines)
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.
Vehicles with a diesel engine: the fuel tank has been run dry (
Ypage 156).
XStart the engine three to four times after refueling.
If the yellow Check Engine warning lamp goes out, emergency running mode is
canceled. The vehicle need not be checked.
In some states, you must immediately visit a qualified specialist workshop as soon
as the yellow Check Engine warning lamp lights up. This is due to the legal require-
ments in effect in these states. If in doubt, check whether such legal regulations
apply in the state in which you are currently driving.
8N The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel level has dropped into the reserve range.
XRefuel at the nearest gas station.
8N 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 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 workshop.
?NThe red coolant warning lamp lights up while the engine is running and the
coolant temperature gauge 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. 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 159).
XConsult a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster283
On-board computer and displays
Z