2018-2026 Mercedes B Class SUV Display messages and warning/indicator lamps -> Warning and indicator lamps User Manual
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Display messages and warning/indicator lamps -> Warning and indicator lamps for Your Mercedes B Class SUV Third Generation (2018-2026)

Warning and indicator lamps
Overview of indicator and warning lamps
Some systems will perform a self-test when the
vehicle is switched on. Some indicator and warn-
ing lamps may briey light up or ash. This behav-
iour is non-critical. These indicator and warning
lamps indicate a malfunction only if they light up
or ash aer the vehicle has been started or dur-
ing a journey.
Standard driver's display
Widescreen cockpit driver's display
Indicator and warning lamps
Occupant safety
6
Restraint system (/ page 823)
ü
Seat belt (/ page 823)
p
Occupant presence reminder (white)
(/ page 823)
p
Occupant presence reminder (yellow)
(/ page 823)
Drive system
_
Reduced power (/ page 825)
Ú
System error (/ page 825)
#
Electrical fault (/ page 825)
Vehicle
ï
Trailer hitch (/ page 826)
Ù
Power steering (yellow) (/ page 826)
Ù
Power steering (red) (/ page 826)
Engine
ÿ
Vehicles with a widescreen cockpit: cool-
ant temperature (/ page 828)
;
Engine diagnostics (/ page 828)
p
Vehicles with a petrol engine: engine oper-
ating temperature (/ page 828)
%
Vehicles with a diesel engine: preglow
#
Electrical fault (/ page 828)
æ
Reserve fuel with fuel ller ap location
indicator (/ page 828)
Brakes
!
Electric parking brake (yellow)
(/ page 831)
Display messages and warning/indicator lamps
821
F247 0072 02
!
Electric parking brake (red) (/ page 831)
J
Brakes (yellow) (/ page 831)
J
Brakes (red) (/ page 831)
Driving and driving safety systems
!
ABS (/ page 833)
÷
ESP
®
(/ page 833)
å
ESP
®
OFF (/ page 833)
Û
ATTENTION ASSIST (/ page 833)
ê
Trac Sign Assist (/ page 833)
ê
Speed Limit Assist (/ page 833)
L
Distance warning (/ page 833)
Ó
Active Brake Assist (/ page 833)
ê
Active Brake Assist (/ page 833)
ä
Indicator lamp inoperative
Mercedes-Benz emergency call system
H
Mercedes-Benz emergency call system
(/ page 838)
Tyre pressure monitoring system
h
Tyre pressure monitoring system
(/ page 838)
Exterior lighting
T
Side lights (/ page 211)
L
Low beam (/ page 211)
K
High beam (/ page 213)
#!
Turn signal lights (/ page 213)
R
Rear fog light (/ page 211)
Symbols on the central display
É
Drive Away Assist (/ page 370)
L
Cross Trac Alert (/ page 371)
º
Manoeuvring brake function (/ page 371)
822
Display messages and warning/indicator lamps
F247 0072 02
Occupant safety
Warning/indicator lamp Possible causes/consequences and M Solutions
6
Restraint system warning
lamp
* The restraint system red warning lamp is lit while the vehicle is on.
The restraint system is malfunctioning (/ page 101).
&
WARNING Risk of injury due to malfunctions in the restraint system
Components in the restraint system may be activated unintentionally or not deploy as intended in an accident.
#
Have the restraint system checked and repaired immediately at a qualied specialist workshop.
Plug-in hybrid:
&
DANGER Risk of fatal injuries due to restraint system malfunctions
Components in the restraint system may be activated unintentionally or not deploy as planned in an accident. In the
event of an accident, the high-voltage on-board electrical system may not be deactivated as intended.
You may suer an electric shock if you touch the damaged components of the high-voltage on-board electrical sys-
tem.
#
Have the restraint system checked and repaired immediately at a qualied specialist workshop.
#
Aer an accident, switch o the vehicle immediately.
#
Drive on carefully.
#
Note the messages on the driver's display.
Display messages and warning/indicator lamps
823
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Warning/indicator lamp Possible causes/consequences and M Solutions
#
Consult a qualied specialist workshop immediately.
ü
Seat belt warning lamp
ashes
* The red seat belt warning lamp ashes and an intermittent warning tone sounds.
The driver or front passenger has not fastened their seat belt while the vehicle is in motion.
#
Fasten your seat belt (/ page 101).
There are objects on the front passenger seat.
#
Remove the objects from the front passenger seat.
ü
Seat belt warning lamp
lights up
* The red seat belt warning lamp lights up once the vehicle has started.
In addition, an intermittent warning tone may sound.
The red seat belt warning lamp reminds the driver and front passenger to fasten their seat belts.
#
Fasten your seat belt (/ page 101).
If you have placed objects on the front passenger seat, the red seat belt warning lamp may remain lit.
p
Occupant presence
reminder warning lamp
(white)
* The white occupant presence reminder warning lamp is lit.
The occupant presence reminder is deactivated.
824
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F247 0072 02
Warning/indicator lamp Possible causes/consequences and M Solutions
p
Occupant presence
reminder warning lamp (yel-
low)
* The yellow occupant presence reminder warning lamp is lit.
The occupant presence reminder is malfunctioning
#
Note the messages on the driver's display.
Drive system
Warning/indicator lamp Possible causes/consequences and M Solutions
_
Reduced-power warning
lamp
* The yellow reduced-power warning lamp is on.
Drive system power output is reduced.
#
Note the messages on the driver's display.
Ú
System error warning lamp
*The red system error warning lamp is lit while the vehicle is in a state of operational readiness õ.
There is a malfunction in the drive system.
#
Note the messages on the driver's display.
Display messages and warning/indicator lamps
825
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Warning/indicator lamp Possible causes/consequences and M Solutions
#
Electrical fault warning lamp
* The red electrical fault warning lamp is lit.
There is a fault with the electrics.
#
Note the messages on the driver's display.
Vehicle
Warning/indicator lamp Possible causes/consequences and M Solutions
ï
Trailer hitch warning lamp
* The red trailer hitch warning lamp is lit.
The trailer hitch is not operational.
&
WARNING Risk of an accident if the ball neck is not locked
The trailer may become detached.
#
Stop the vehicle immediately in accordance with the trac conditions. Do not continue driving.
#
Uncouple the trailer and secure it against rolling away.
#
Initiate a new swivelling procedure and do not re-couple the trailer until the display message disappears.
#
Note the messages on the driver's display.
826
Display messages and warning/indicator lamps
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Warning/indicator lamp Possible causes/consequences and M Solutions
Ù
Power steering warning
lamp (yellow)
* The yellow power steering warning lamp is lit while the vehicle is running.
The power assistance or the steering itself is malfunctioning.
#
Note the messages on the driver's display.
Ù
Power steering warning
lamp (red)
* The red power steering warning lamp is lit while the vehicle is running.
The power assistance or the steering itself is malfunctioning.
&
WARNING Risk of accident if steering capability is impaired
If the steering does not function as intended, the vehicle's operating safety is jeopardised.
#
Pull over and stop the vehicle safely as soon as possible, paying attention to road and trac conditions. Do not
continue driving under any circumstances.
#
Consult a qualied specialist workshop.
#
Note the messages on the driver's display.
Display messages and warning/indicator lamps
827
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Engine
Warning/indicator lamp Possible causes/consequences and M Solutions
ÿ
Coolant warning lamp (red)
* The red coolant warning lamp is lit while the engine is running.
Possible causes:
R
The temperature sensor is malfunctioning
R
The coolant level is too low
R
The air supply to the radiator is obstructed
R
The radiator fan is faulty
R
The engine coolant pump is faulty
If there is an additional warning tone, the coolant temperature has exceeded 120°C.
&
WARNING Risk of burns when opening the bonnet
If you open the bonnet in the event of an overheated engine or re in the engine compartment, the following situa-
tions may occur:
R
You may come into contact with hot gases.
R
You may come into contact with other escaping hot operating uids.
#
Before opening the bonnet, allow the engine to cool down.
#
In the event of a re in the engine compartment, keep the bonnet closed and call the re service.
828
Display messages and warning/indicator lamps
F247 0072 02
Warning/indicator lamp Possible causes/consequences and M Solutions
#
Stop immediately in accordance with the trac conditions and switch o the vehicle. Do not continue driving.
#
Note the messages on the driver's display.
If the coolant temperature display is at the lower end of the temperature scale:
#
Consult a qualied specialist workshop.
If the coolant temperature display is at the upper end of the temperature scale:
#
Exit the vehicle and keep a safe distance from it until the engine has cooled down.
#
Check the coolant level (/ page 551).
#
Make sure that the air supply to the radiator is not obstructed.
#
Avoiding high loads on the engine, drive to the nearest qualied specialist workshop. In doing so, ensure that the
coolant temperature display remains below 120°C.
ÿ
Coolant warning lamp (yel-
low)
* The yellow coolant warning lamp is lit while the engine is running.
Possible causes:
R
The temperature sensor is malfunctioning
R
The charge air, transmission oil or battery cooling is faulty
R
The radiator shutters are blocked or defective
#
Avoiding high loads on the engine, drive to the nearest qualied specialist workshop.
Display messages and warning/indicator lamps
829
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Warning/indicator lamp Possible causes/consequences and M Solutions
;
Engine diagnostics warning
lamp
* The yellow engine diagnostics warning lamp is lit while the engine is running.
A malfunction has occurred in the engine, the exhaust system or the fuel system.
The emissions limit value may have been exceeded and the engine may be running in emergency operation mode.
#
Have the vehicle checked as soon as possible at a qualied specialist workshop.
Vehicles with a diesel engine: the fuel tank may have been run dry.
#
Start the engine three to four times aer refuelling.
If the yellow engine diagnosis warning lamp goes out, emergency operation mode is cancelled. The vehicle need not
be checked.
#
Electrical fault warning lamp
* The red electrical fault warning lamp is lit.
There is a fault in the electrics.
#
Note the messages on the driver's display.
p
Engine operating tempera-
ture warning lamp
*
Vehicles with a petrol engine: aer a cold start, the blue engine operating temperature warning lamp is on.
Engine output and engine torque are reduced.
#
Take this into consideration in your driving style.
830
Display messages and warning/indicator lamps
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Warning/indicator lamp Possible causes/consequences and M Solutions
æ
Fuel reserve warning lamp
lights up
* The yellow fuel reserve warning lamp lights up while the engine is running.
The fuel supply has dropped into the reserve range.
#
Refuel.
Brakes
Warning/indicator lamp Possible causes/consequences and M Solutions
!
Electric parking brake indi-
cator lamp (red)
!
Electric parking brake indi-
cator lamp (yellow)
*The red electric parking brake indicator lamp ashes or is lit.
The yellow electric parking brake indicator lamp is also lit in the event of a malfunction.
#
Note the messages on the driver's display.
Display messages and warning/indicator lamps
831
F247 0072 02
Warning/indicator lamp Possible causes/consequences and M Solutions
J
Brakes warning lamp (yel-
low)
* The yellow brake warning lamp is lit while the vehicle is running.
&
WARNING Risk of an accident due to a brake system malfunction
If the brake system is malfunctioning, braking characteristics may be impaired.
#
Drive on carefully.
#
Have the brake system checked immediately at a qualied specialist workshop.
#
Adjust your speed and drive on carefully, leaving a suitable distance to the vehicle in front.
#
If the driver's display shows a display message, observe it.
#
Consult a qualied specialist workshop.
J
Brakes warning lamp (red)
* The red brakes warning lamp is lit while the vehicle is running.
Possible causes:
R
The brake force boosting is malfunctioning and the braking characteristics may be aected.
R
There is insucient brake uid in the brake uid reservoir.
#
Note the messages on the driver's display.
&
WARNING Risk of accident and injury if brake force boosting is malfunctioning
If brake force boosting is malfunctioning, increased brake pedal force may be necessary for braking. The braking
characteristics may be impaired. The braking distance can increase in emergency braking situations.
832
Display messages and warning/indicator lamps
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Warning/indicator lamp Possible causes/consequences and M Solutions
#
Stop in a safe location immediately. Do not continue driving!
#
Consult a qualied specialist workshop.
&
WARNING Risk of an accident due to low brake uid level
If the brake uid level is too low, the braking eect and the braking characteristics may be impaired.
#
Stop the vehicle as soon as possible, paying attention to road and trac conditions. Do not continue driving.
#
Consult a qualied specialist workshop.
#
Do not top up the brake uid.
Driving and driving safety systems
Warning/indicator lamp Possible causes/consequences and M Solutions
!
ABS warning lamp
* The yellow ABS warning lamp is lit while the vehicle is running.
ABS is malfunctioning.
If an additional warning tone sounds, EBD is malfunctioning.
Other driving systems and driving safety systems may also be malfunctioning.
#
Note the messages on the driver's display.
Display messages and warning/indicator lamps
833
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Warning/indicator lamp Possible causes/consequences and M Solutions
&
WARNING There is a risk of skidding if EBD or ABS is malfunctioning
The wheels may lock during braking.
The steerability and braking characteristics are heavily impaired and the braking distance may increase. In addition,
other driving safety systems are switched o.
#
Drive on carefully.
#
Have the brake system checked immediately at a qualied specialist workshop.
#
Drive on carefully.
#
Consult a qualied specialist workshop.
÷
ESP
®
warning lamp ashes
*
The yellow ESP
®
warning lamp ashes while the vehicle is in motion.
One or more wheels have reached their grip limit (/ page 313).
#
Adapt your driving style to suit the road and weather conditions.
÷
ESP
®
warning lamp lights up
*
The yellow ESP
®
warning lamp is lit while the vehicle is running.
ESP
®
is malfunctioning.
Other driving systems and driving safety systems (e.g. BAS) may also be malfunctioning.
#
Note the messages on the driver's display.
834
Display messages and warning/indicator lamps
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Warning/indicator lamp Possible causes/consequences and M Solutions
&
WARNING Risk of skidding if ESP
®
is malfunctioning
If ESP
®
is malfunctioning, ESP
®
cannot carry out vehicle stabilisation. In addition, other driving safety systems are
switched o.
#
Drive on carefully.
#
Have ESP
®
checked at a qualied specialist workshop.
#
Drive on carefully.
#
Consult a qualied specialist workshop immediately.
å
ESP
®
OFF warning lamp
*
The yellow ESP
®
OFF warning lamp is lit while the vehicle is running.
ESP
®
is deactivated.
Other driving systems and driving safety systems may also be inoperative.
&
WARNING Risk of skidding when driving with ESP
®
deactivated
ESP
®
does not act to stabilise the vehicle. The availability of further driving safety systems is also limited.
#
Drive on carefully.
#
Deactivate ESP
®
only for as long as the situation requires.
If ESP
®
cannot be activated, ESP
®
is malfunctioning.
#
Have ESP
®
checked immediately at a qualied specialist workshop.
Display messages and warning/indicator lamps
835
F247 0072 02
Warning/indicator lamp Possible causes/consequences and M Solutions
#
Observe the notes on deactivating ESP
®
(/ page 313).
Û
ATTENTION ASSIST warning
lamp
* The ATTENTION ASSIST warning lamp is lit.
ATTENTION ASSIST is malfunctioning.
#
Consult a qualied specialist workshop.
ê
Trac Sign Assist warning
lamp
* The Trac Sign Assist warning lamp is lit.
Trac Sign Assist is malfunctioning.
#
Note the messages on the driver's display.
ê
Speed Limit Assist warning
lamp
* The Speed Limit Assist warning lamp is lit.
Speed Limit Assist is malfunctioning.
#
Note the messages on the driver's display.
836
Display messages and warning/indicator lamps
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Warning/indicator lamp Possible causes/consequences and M Solutions
L
Warning lamp for distance
warning
* The red distance warning lamp lights up while the vehicle is in motion.
The distance to the vehicle in front is too small for the speed selected.
If there is an additional warning tone, you are approaching an obstacle at too high a speed.
#
Be prepared to brake immediately.
#
Increase the distance.
Function of Active Brake Assist (/ page 335).
Ó
Active Brake Assist warning
lamp
* The Active Brake Assist warning lamp is on.
Due to dirty sensors or a malfunction, the system is not available or the range of functions is restricted.
#
Note the messages on the driver's display.
ê
Active Brake Assist warning
lamp
* The Active Brake Assist warning lamp is on.
The system is switched o or the range of functions has been automatically restricted.
This may be the case if another driving system has been activated.
#
Observe the notes on Active Brake Assist (/ page 335).
Display messages and warning/indicator lamps
837
F247 0072 02
Mercedes-Benz emergency call system
Warning/indicator lamp Possible causes/consequences and M Solutions
H
Mercedes-Benz emergency
call system warning lamp
*The Mercedes-Benz emergency call system is malfunctioning. The Mercedes me connect system is also malfunctioning.
#
Consult a qualied specialist workshop.
Tyre pressure monitor
Warning/indicator lamp Possible causes/consequences and M Solutions
h
Tyre pressure monitoring
system warning lamp ashes
*The yellow tyre pressure monitor warning lamp (pressure loss/malfunction) ashes for approximately one minute and
then remains lit.
The tyre pressure monitoring system is malfunctioning.
&
WARNING There is a risk of an accident if the tyre pressure monitoring system is malfunctioning
The tyre pressure monitoring system cannot issue a warning if there is pressure loss in one or more of the tyres.
Tyres with insucient tyre pressure may impair the driving characteristics as well as steering and braking.
#
Have the tyre pressure monitoring system checked at a qualied specialist workshop.
#
Consult a qualied specialist workshop.
838
Display messages and warning/indicator lamps
F247 0072 02
Warning/indicator lamp Possible causes/consequences and M Solutions
h
Tyre pressure monitoring
system warning lamp lights
up
*The yellow tyre pressure monitoring system warning lamp (pressure loss/malfunction) is lit.
The tyre pressure monitoring system has detected tyre pressure loss in at least one of the tyres.
&
WARNING Risk of an accident due to insucient tyre pressure
R
The tyres can burst.
R
The tyres can wear excessively and/or unevenly.
R
The driving characteristics as well as the steering and braking may be greatly impaired.
You could then lose control of the vehicle.
#
Observe the recommended tyre pressures.
#
Adjust the tyre pressure if necessary.
#
Stop the vehicle in accordance with the trac conditions.
#
Check the tyre pressure and the tyres.
Display messages and warning/indicator lamps
839
F247 0072 02

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