2018-2026 Mercedes A Class 4 Door 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 A Class 4 Door Third Generation (2018-2026)

Display messages and warning/indicator lamps  
386  
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F
!
!
é
J
Widescreen cockpit instrument display  
Reserve fuel with fuel ꢃller ꢀap loca-  
tion indicator (/ page 389)  
Warning and indicator lamps  
Overvieww of indicatoor and warnning lamps  
USA: electric parking brake (red)  
(/ page 393)  
Some systems will perform a self-test when the  
vehicle is switched on. Some indicator and warn-  
ing lamps may brieꢀy light up or ꢀash. This behav-  
ior is non-critical. These indicator and warning  
lamps indicate a malfunction only if they light up  
or ꢀash aꢁer the vehicle has been started or dur-  
ing a journey.  
Canada: electric parking brake (red)  
(/ page 393)  
Electric parking brake (yellow)  
(/ page 393)  
USA: Recuperative Brake System  
(/ page 393)  
Standard instrument display  
Canada: brakes (yellow)  
(/ page 393)  
Depending on the display setting, the positions of  
the indicator lamps on the instrument display may  
diꢂer from the example shown.  
$
J
L
Ó
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!
÷
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USA: brakes (red) (/ page 393)  
Canada: brakes (red) (/ page 393)  
Distance warning (/ page 396)  
Active Brake Assist (/ page 396)  
Active Brake Assist (/ page 396)  
ABS (/ page 397)  
Indicator and warning lamps:  
6
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ÿ
Restraint system (/ page 387)  
Seat belt (/ page 387)  
Power steering (/ page 388)  
Vehicles with a widescreen cockpit:  
coolant temperature (/ page 389)  
ESP® (/ page 397)  
ESP® OFF (/ page 397)  
;
#
Engine diagnostics (/ page 389)  
Electrical malfunction (/ page 389)  
Display messages and warning/indicator lamps  
387  
h
Tire pressure monitoring system  
(/ page 399)  
T
Parking lights (/ page 112)  
Low beam (/ page 112)  
L
K
High beam (/ page 113)  
Turn signal lights (/ page 113)  
Rear fog light (/ page 112)  
#!  
R
Occupantt safety  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* The restraint system red warning lamp is lit while the vehicle is on.  
The restraint system is malfunctioning (/ page 38).  
6
&
WARNING Risk of injury due to malfunctions in the restraint system  
Restraint system warning  
lamp  
Components in the restraint system may be activated unintentionally or not deploy as planned in an accident.  
#
Have the restraint system checked and repaired immediately at a qualiꢃed specialist workshop.  
#
Drive on carefully.  
#
#
Note the messages on the instrument display.  
Consult a qualiꢃed specialist workshop immediately.  
Display messages and warning/indicator lamps  
388  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* The red seat belt warning lamp ꢀashes and an intermittent warning tone sounds.  
The driver or front passenger has not fastened his/her seat belt while the vehicle is in motion.  
ü
#
Fasten your seat belt (/ page 41).  
There are objects on the front passenger seat.  
Seat belt warning lamp  
ꢀashes  
#
Remove the objects from the front passenger seat.  
*The red seat belt warning lamp lights up for six seconds 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.  
ü
#
Seat belt warning lamp  
lights up  
Fasten your seat belt (/ page 41).  
If you have placed objects on the front passenger seat, the red seat belt warning lamp may remain lit.  
Vehicle  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* The red power steering warning lamp is lit while the vehicle is running.  
The power assistance or the steering itself is malfunctioning.  
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&
WARNING Risk of accident if steering capability is impaired  
Power steering warning  
lamp (red)  
If the steering does not function as intended, the vehicle's operating safety is jeopardized.  
Display messages and warning/indicator lamps  
389  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
#
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traꢄc conditions. Do not  
continue driving under any circumstances.  
#
Consult a qualiꢃed specialist workshop.  
#
Note the messages on the instrument display.  
Engine  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* The red coolant warning lamp is lit while the engine is running.  
Possible causes:  
ÿ
R
The temperature sensor is malfunctioning  
Coolant warning lamp (red)  
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 the maximum permissible temperature.  
Display messages and warning/indicator lamps  
390  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
&
WARNING Risk of burns when opening the hood  
If you open the hood in the event of an overheated engine or ꢃre in the engine compartment, the following situations  
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 hood, allow the engine to cool down.  
#
In the event of a ꢃre in the engine compartment, keep the hood closed and call the ꢃre service.  
#
Stop immediately in accordance with the traꢄc conditions and switch oꢂ the vehicle. Do not continue driving.  
Note the messages on the instrument display.  
#
If the coolant temperature display is at the lower end of the temperature scale:  
#
Consult a qualiꢃed 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 262).  
#
Make sure that the air supply to the radiator is not obstructed.  
#
Avoiding high loads on the engine, drive to the nearest qualiꢃed specialist workshop. In doing so, ensure that the  
coolant temperature display remains below the red area.  
Display messages and warning/indicator lamps  
391  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* The yellow coolant warning lamp is lit while the engine is running.  
Possible causes:  
ÿ
R
The temperature sensor is malfunctioning  
Coolant warning lamp (yel-  
low)  
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 qualiꢃed specialist workshop.  
* The yellow Check Engine warning lamp is lit while the engine is running.  
A malfunction has occurred in the engine, the exhaust system or the fuel system.  
;
The emission limit values may be exceeded and the engine may be in emergency mode.  
Engine diagnosis warning  
lamp  
In some states, legal requirements stipulate that you must immediately consult a qualiꢃed specialist workshop as soon  
as the yellow Check Engine warning lamp lights up.  
#
Have the vehicle checked as soon as possible at a qualiꢃed specialist workshop.  
* The red electrical malfunction warning lamp is lit.  
There is a malfunction in the electrics.  
#
#
Note the messages on the instrument display.  
Electrical malfunction warn-  
ing lamp  
Display messages and warning/indicator lamps  
392  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* The yellow fuel reserve warning lamp lights up while you are driving.  
There has been pressure loss in the fuel system. The fuel ꢃller cap is not closed correctly or the fuel system is leaking.  
æ
#
Close the fuel ꢃller cap.  
Fuel reserve warning lamp  
ꢀashes  
If the fuel ꢃller cap has already been closed correctly:  
#
Consult a qualiꢃed specialist workshop.  
* The yellow fuel reserve warning lamp lights up while the engine is running.  
The fuel supply has dropped into the reserve range.  
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#
Refuel.  
Fuel reserve warning lamp  
lights up  
Display messages and warning/indicator lamps  
393  
Brakes  
Warning/indiicator lammp  
Possible causes/consequences and M Solutions  
*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.  
#
F
Note the messages on the instrument display.  
Electric parking brake indi-  
cator lamp (red) (USA only)  
!
Electric parking brake indi-  
cator lamp (red) (Canada  
only)  
!
The electric parking brake  
(yellow) indicator lamp  
Display messages and warning/indicator lamps  
394  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
*The yellow é warning lamp (USA only) or the yellow J brake warning lamp (Canada only) is lit while the vehicle is  
running.  
é
&
WARNING Risk of an accident due to a brake system malfunction  
Recuperative Brake System  
warning lamp (USA only)  
If the brake system is malfunctioning, braking characteristics may be impaired.  
#
Drive on carefully.  
#
Have the brake system checked immediately at a qualiꢃed specialist workshop.  
J
#
Brakes warning lamp (yel-  
low) (Canada only)  
Adjust your speed and drive on carefully, leaving a suitable distance to the vehicle in front.  
If the instrument display shows a display message, observe it.  
Consult a qualiꢃed specialist workshop.  
#
#
Display messages and warning/indicator lamps  
395  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* The red brake warning lamp is lit while the vehicle is running.  
Possible causes:  
$
R
The brake force boosting is malfunctioning and the braking characteristics may be aꢂected.  
There is insuꢄcient brake ꢀuid in the brake ꢀuid reservoir.  
Brake warning lamp (USA  
only)  
R
#
Note the messages on the instrument display.  
J
&
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.  
Brake system warning lamp  
(Canada only)  
#
Stop in a safe location immediately. Do not continue driving.  
#
Consult a qualiꢃed specialist workshop.  
&
WARNING Risk of an accident due to low brake ꢀuid level  
If the brake ꢀuid level is too low, the braking eꢂect and the braking characteristics may be impaired.  
#
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traꢄc conditions. Do not  
continue driving under any circumstances.  
#
Consult a qualiꢃed specialist workshop.  
#
Do not add brake ꢀuid.  
Display messages and warning/indicator lamps  
396  
Drivingg systems  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* 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.  
L
If there is an additional warning tone, you are approaching an obstacle at too high a speed.  
#
Warning lamp for distance  
warning function  
Be prepared to brake immediately.  
#
Increase the distance.  
Function of Active Brake Assist (/ page 175).  
* 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.  
Ó
#
Note the messages on the instrument display.  
Active Brake Assist warning  
lamp  
* The Active Brake Assist warning lamp is on.  
The system is switched oꢂ or the range of functions has been automatically restricted.  
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This may be the case if the driver is not wearing a seat belt or another driving system has been activated.  
#
Active Brake Assist warning  
lamp  
Observe the notes on Active Brake Assist (/ page 175).  
Display messages and warning/indicator lamps  
397  
Driving safety systems  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
* The yellow ABS warning lamp is lit while the vehicle is running.  
ABS is malfunctioning.  
!
If an additional warning tone sounds, EBD is malfunctioning.  
ABS warning lamp  
Other driving systems and driving safety systems may also be malfunctioning.  
#
Note the messages on the instrument display.  
&
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 oꢂ.  
#
Drive on carefully.  
#
Have the brake system checked immediately at a qualiꢃed specialist workshop.  
The yellow ESP® warning lamp ꢀashes while the vehicle is in motion.  
*
One or more wheels have reached their grip limit (/ page 157).  
÷
#
Adapt your driving style to suit the road and weather conditions.  
ESP® warning lamp ꢀashes  
Display messages and warning/indicator lamps  
398  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
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.  
#
ESP® warning lamp lights up  
Note the messages on the instrument display.  
WARNING Risk of skidding if ESP® is malfunctioning  
&
If ESP® is malfunctioning, ESP® cannot carry out vehicle stabilization. In addition, other driving safety systems are  
switched oꢂ.  
#
Drive on carefully.  
Have ESP® checked at a qualiꢃed specialist workshop.  
#
The yellow ESP® OFF warning lamp is lit while the vehicle is running.  
ESP® is deactivated.  
*
å
Other driving systems and driving safety systems may also be inoperative.  
ESP® OFF warning lamp  
WARNING Risk of skidding when driving with ESP® deactivated  
&
ESP® does not act to stabilize 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.  
#
Display messages and warning/indicator lamps  
399  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
If ESP® cannot be activated, ESP® is malfunctioning.  
Have ESP® checked immediately at a qualiꢃed specialist workshop.  
#
Observe the notes on deactivating ESP® (/ page 157).  
#
Tire pressuure monitor  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
*The yellow tire pressure monitor warning lamp (pressure loss/malfunction) ꢀashes for approximately one minute and  
then remains lit.  
The tire pressure monitor is malfunctioning.  
h
system warning lamp ꢀashes  
Tire pressure monitoring  
&
WARNING There is a risk of an accident if the tire pressure monitoring system is malfunctioning  
The tire pressure monitoring system cannot issue a warning if there is pressure loss in one or more of the tires.  
Tires with insuꢄcient tire pressure may impair the driving characteristics as well as steering and braking.  
#
Have the tire pressure monitoring system checked at a qualiꢃed specialist workshop.  
Display messages and warning/indicator lamps  
400  
Warning/indicator lamp  
Possible causes/consequences and M Solutions  
*The yellow tire pressure monitoring system warning lamp (pressure loss/malfunction) is lit.  
The tire pressure monitoring system has detected tire pressure loss in at least one of the tires.  
h
&
WARNING Risk of an accident due to insuꢄcient tire pressure  
Tire pressure monitoring  
system warning lamp lights  
up  
R
R
R
The tires can burst.  
The tires can wear excessively and/or unevenly.  
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 tire pressures.  
#
Adjust the tire pressure if necessary.  
#
Stop the vehicle in accordance with the traꢄc conditions.  
Check the tire pressure and the tires.  
#

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