2013-2018 Mercedes CLA 4 Door On-board computer and displays -> Warning and indicator lamps in the instrument cluster User Manual
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On-board computer and displays -> Warning and indicator lamps in the instrument cluster for Your Mercedes CLA 4 Door First Generation (2013-2018)

Display messages
Possible causes/consequences and MM Solutions
Â
Key not detectedKey not detected
(red display message)
The key is not in the vehicle.
A warning tone also sounds.
If the engine is switched off, you can no longer lock the vehicle cen-
trally or start the engine.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X
Secure the vehicle against rolling away (Y page 155).
X
Locate the key.
Because there is interference from a strong source of radio waves, the
key is not detected whilst the engine is running.
A warning tone also sounds.
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X
Secure the vehicle against rolling away (Y page 155).
X
Insert the key into the ignition lock and bring into key mode.
Â
Key not detectedKey not detected
(white display message)
The key is currently undetected.
X
Change the location of the key in the vehicle.
If the key still cannot be detected:
X
Operate the vehicle with the key in the ignition lock if necessary.
Â
RemoveRemove startingstarting but‐but‐
ton,ton, thenthen insertinsert keykey
The key is continually undetected.
The key detection function has a temporary malfunction or is faulty. A
warning tone also sounds.
X
Insert the key into the ignition lock and turn it to the desired posi-
tion.
X
Consult a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster
General notes
Some systems perform a self test when the ignition is switched on. Some warning and indicator
lamps may temporarily switch on or flash during the test. This behaviour is nothing to be concerned
about.
The warning and indicator lamps will alert you to a malfunction if they switch on or flash after the
engine is started or while driving.
Warning and indicator lamps in the instrument cluster
247
On-board computer and displays
Z
Safety
Seat belts
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
ü
N Only for certain countries: the red seat belt warning lamp lights up for 6 seconds
after the engine starts.
The seat belt warning lamp reminds the driver and front passenger to fasten their
seat belts.
X
Fasten your seat belt (Y page 43).
ü
N Only for certain countries: the red seat belt warning lamp lights up after the
engine starts. In addition, a warning tone sounds for up to 6 seconds.
The driver's seat belt is not fastened.
X
Fasten your seat belt (Y page 43).
The warning tone ceases.
ü
N 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 passenger has not fastened their seat belt.
X
Fasten your seat belt (Y page 43).
The warning lamp goes out.
There are objects on the front-passenger seat.
X
Remove the objects from the front-passenger seat and stow them in a secure
place.
The warning lamp goes out.
ü
N The red seat belt warning lamp flashes and an intermittent audible warning
sounds.
The driver or passenger has not fastened their seat belt. At the same time, you are
driving faster than 25 km/h or have briefly driven faster than 25 km/h.
X
Fasten your seat belt (Y page 43).
The warning lamp goes out and the intermittent warning tone ceases.
There are objects on the front-passenger seat. At the same time, you are driving
faster than 25 km/h or have briefly driven faster than 25 km/h.
X
Remove 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.
248
Warning and indicator lamps in the instrument cluster
On-board computer and displays
Safety systems
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
J
N The red brake system warning lamp lights up while the engine is running. A
warning tone also sounds.
G
WARNING
The brake boosting effect is malfunctioning and the braking characteristics may be
affected.
There is a risk of an accident.
X
Stop the vehicle immediately, paying attention to road and traffic conditions. Do
not continue driving.
X
Secure the vehicle against rolling away (Y page 155).
X
Consult a qualified specialist workshop.
X
Observe the additional display messages in the multifunction display.
J
N The red brake system warning lamp lights up while the engine is running. A
warning tone also sounds.
There is insufficient brake fluid in the brake fluid reservoir.
G
WARNING
Braking efficiency may be impaired.
There is a risk of an accident.
X
Stop the vehicle immediately, paying attention to road and traffic conditions. Do
not continue driving.
X
Secure the vehicle against rolling away (Y page 155).
X
Do not top up the brake fluid. Topping up will not correct the fault.
X
Consult a qualified specialist workshop.
X
Observe the additional display messages in the multifunction display.
Warning and indicator lamps in the instrument cluster
249
On-board computer and displays
Z
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
!
N The yellow ABS warning lamp lights up while the engine is running.
ABS (Anti-lock Braking System) has been deactivated due to a fault. BAS (Brake
Assist), Active Brake Assist, ESP
®
(Electronic Stability Program), ESP
®
trailer sta-
bilisation, the HOLD function, hill start assist, the adaptive brake lights and
PRE‑SAFE
®
are also deactivated, for example.
ATTENTION ASSIST is deactivated.
G
WARNING
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 impaired as a result.
The braking distance may increase in an emergency braking situation.
If ESP
®
is not operational, ESP
®
is unable to stabilise the vehicle.
Increased risk of skidding and/or accident!
X
Observe the additional display messages in the multifunction display.
X
Drive on carefully.
X
Consult 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 be unavailable.
250
Warning and indicator lamps in the instrument cluster
On-board computer and displays
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
!
N The yellow ABS warning lamp lights up while the engine is running.
ABS is temporarily unavailable. BAS, Active Brake Assist, ESP
®
, ESP
®
trailer sta-
bilisation, EBD (Electronic Brake-force Distribution), the HOLD function, hill start
assist, the adaptive brake lights and PRE‑SAFE
®
, for example, are also deactivated.
Possible causes:
R
Self-diagnosis is not yet complete.
R
The on-board voltage may be insufficient.
ATTENTION ASSIST is deactivated.
G
WARNING
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 impaired as a result.
The braking distance may increase in an emergency braking situation.
If ESP
®
is not operational, ESP
®
is unable to stabilise the vehicle.
There is a risk of an accident.
X
Carefully drive on a suitable stretch of road, making slight steering movements
at a speed above 20 km/h.
The functions mentioned above are available again when the warning lamp goes
out.
If the warning lamp is still on:
X
Observe the additional display messages in the multifunction display.
X
Drive on carefully.
X
Consult a qualified specialist workshop immediately.
!
N The yellow ABS warning lamp lights up while the engine is running. A warning
tone also sounds.
EBD is faulty. ABS, BAS, Active Brake Assist, ESP
®
, ESP
®
trailer stabilisation, the
HOLD function, hill start assist, the adaptive brake lights and PRE‑SAFE
®
, for
example, are also unavailable.
ATTENTION ASSIST is deactivated.
G
WARNING
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 impaired as a result.
The braking distance may increase in an emergency braking situation.
If ESP
®
is not operational, ESP
®
is unable to stabilise the vehicle.
Increased risk of skidding and/or accident!
X
Observe the additional display messages in the multifunction display.
X
Drive on carefully.
X
Consult a qualified specialist workshop immediately.
Warning and indicator lamps in the instrument cluster
251
On-board computer and displays
Z
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
!
֌
J
N The red brake system warning lamp and the yellow ABS, ESP
®
and ESP
®
OFF
warning lamps are lit while the drive system is running.
ABS and ESP
®
are malfunctioning. BAS, Active Brake Assist, EBD, PRE‑SAFE
®
, the
HOLD function, hill start assist, the adaptive brake lights and ESP
®
trailer stabili-
sation, for example, are also unavailable.
ATTENTION ASSIST is deactivated.
G
WARNING
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 impaired as a result.
The braking distance may increase in an emergency braking situation.
If ESP
®
is not operational, ESP
®
is unable to stabilise the vehicle.
Increased risk of skidding and/or accident!
X
Observe the additional display messages in the multifunction display.
X
Drive on carefully.
X
Consult a qualified specialist workshop immediately.
÷
N The yellow ESP
®
warning lamp flashes while the vehicle is in motion.
ESP
®
or traction control has engaged due to a risk of skidding or because at least
one wheel has started to spin.
Cruise control or Distance Pilot DISTRONIC is deactivated.
X
Only depress the accelerator pedal as far as necessary when pulling away.
X
Accelerate more gently while the vehicle is in motion.
X
Adapt your driving style to suit the road and weather conditions.
X
Do not deactivate ESP
®
.
In exceptional cases (Y page 71) it may be better to deactivate ESP
®
.
Observe the important safety notes on ESP
®
(Y page 70).
252
Warning and indicator lamps in the instrument cluster
On-board computer and displays
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
å
N The yellow ESP
®
OFF warning lamp is lit while the engine is running.
ESP
®
is deactivated. ESP
®
will not stabilise the vehicle if it starts to skid or if a
wheel starts to spin.
G
WARNING
If ESP
®
is deactivated, ESP
®
is unable to stabilise the vehicle.
Further driving systems or driving safety systems are thus restricted.
Increased risk of skidding and/or accident!
X
Reactivate ESP
®
.
In exceptional cases (Y page 71) it may be better to deactivate ESP
®
.
Observe the important safety notes on ESP
®
(Y page 70).
X
Adapt your driving style to suit the road and weather conditions.
If ESP
®
cannot be activated:
X
Drive on carefully.
X
Contact a qualified specialist workshop immediately and have the ESP
®
system
checked.
M
N Mercedes-AMG vehicles only:
The yellow SPORT handling mode warning lamp lights up while the engine is run-
ning.
SPORT handling mode is activated.
G
WARNING
When SPORT handling mode is activated, ESP
®
is unable to stabilise the vehicle.
Increased risk of skidding and/or accident!
X
Only switch to SPORT handling mode in accordance with the conditions descri-
bed in the "Activating/deactivating ESP
®
" section (Y page 71).
֌
N The yellow ESP
®
and ESP
®
OFF warning lamps are lit while the engine is running.
ESP
®
, ESP
®
trailer stabilisation, BAS, Active Brake Assist, the HOLD function, hill
start assist, the adaptive brake lights and PRE‑SAFE
®
are not available due to a
malfunction.
ATTENTION ASSIST is deactivated.
G
WARNING
The brake system continues to function normally, but without the functions listed
above.
The braking distance may thus increase in an emergency braking situation.
If ESP
®
is not operational, ESP
®
is unable to stabilise the vehicle.
Increased risk of skidding and/or accident!
X
Observe the additional display messages in the multifunction display.
X
Drive on carefully.
X
Consult a qualified specialist workshop immediately.
Warning and indicator lamps in the instrument cluster
253
On-board computer and displays
Z
Engine
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
;
N The yellow engine diagnostics warning lamp lights up while the engine is run-
ning.
There may be a fault with the following, for example:
R
Engine management
R
Fuel injection system
R
Exhaust system
R
Ignition system (for vehicles with petrol engines)
R
Fuel system
The emission limit values may be exceeded and the engine may be running in
emergency mode.
X
Consult a qualified specialist workshop immediately.
Vehicles with a diesel engine: the fuel tank has been run dry (Y page 155).
X
Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emergency mode is
cancelled. The vehicle does not have to be checked.
æ
N The yellow reserve fuel warning lamp lights up while the engine is running.
The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel level drops into the
reserve range.
X
Refuel at the nearest filling station.
?
N The 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. The engine could be dam-
aged if the coolant temperature is too high.
X
Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine. Do not continue driving.
X
Secure the vehicle against rolling away (Y page 155).
X
Consult a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster
255
On-board computer and displays
Z
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
?
N The red coolant warning lamp lights up while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked or
the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is not being cooled sufficiently.
X
Observe the additional display messages in the multifunction display.
X
Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
X
Secure the vehicle against rolling away (Y page 155).
X
Leave the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
X
Check the coolant level and top up the coolant, making sure to observe the
warning notes (Y page 283).
X
If you have to top up the coolant frequently, have the engine cooling system
checked.
X
Make sure that the air supply to the engine radiator is not blocked, e.g. by frozen
slush.
X
Do not start the engine again until the coolant temperature is below 120 †. The
engine may otherwise be damaged.
X
Drive to the nearest qualified specialist workshop.
X
Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-start traffic.
?
N The red coolant warning lamp lights up while the engine is running. A warning
tone also sounds.
The coolant temperature has exceeded 120 †. The airflow to the engine radiator
may be blocked or the coolant level may be too low.
G
WARNING
The engine is not being cooled sufficiently and may be damaged.
Never drive with an overheated engine. Driving when your engine has overheated
can cause any fluids that may have leaked into the engine compartment to catch
fire.
In addition, steam from an overheated engine can cause serious burns, which can
occur just by opening the bonnet.
There is a risk of injury.
X
Observe the additional display messages in the multifunction display.
X
Stop the vehicle immediately, paying attention to road and traffic conditions,
and switch off the engine.
X
Secure the vehicle against rolling away (Y page 155).
X
Leave the vehicle and keep a safe distance from the vehicle until the engine has
cooled down.
X
Check the coolant level and top up the coolant, making sure to observe the
warning notes (Y page 283).
X
If you have to top up the coolant frequently, have the engine cooling system
checked.
256
Warning and indicator lamps in the instrument cluster
On-board computer and displays
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
X
Make sure that the air supply to the engine radiator is not blocked, e.g. by frozen
slush.
X
If the coolant temperature is below 120 †, you can continue driving to the
nearest qualified specialist workshop.
X
Avoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-start traffic.
Driving systems
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
·
N 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.
X
Increase the distance.
·
N The red distance warning lamp lights up while the vehicle is in motion. A warning
tone also sounds.
You are approaching a vehicle or a stationary obstacle in your line of travel at too
high a speed.
X
Be prepared to brake immediately.
X
Pay careful attention to the traffic situation. You may have to brake or take
evasive action.
Further information on the distance warning function of Active Brake Assist
(Y page 67).
Warning and indicator lamps in the instrument cluster
257
On-board computer and displays
Z
Tyres
Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and M
M Solutions
h
N The yellow tyre pressure monitor warning lamp (pressure loss/malfunction) is
lit.
The tyre pressure monitor has detected a loss of pressure in at least one of the
tyres.
G
WARNING
Underinflated tyres pose the following risks:
R
the tyres may burst, especially as the load and vehicle speed increase
R
the tyres may wear excessively and/or unevenly, which may greatly impair tyre
traction
R
the driving characteristics, as well as steering and braking, may be greatly
impaired
There is a risk of an accident.
X
Stop the vehicle without making any sudden steering or braking manoeuvres.
Pay attention to the traffic conditions as you do so.
X
Safeguard the vehicle against rolling away (Y page 155).
X
Observe the additional display messages in the multifunction display.
X
Check the tyres and, if necessary, follow the instructions for a flat tyre
(Y page 294).
X
Check the tyre pressure (Y page 315).
X
If necessary, correct the tyre pressure.
h
N The yellow tyre pressure monitor warning lamp (pressure loss/malfunction)
flashes for approximately one minute and then remains lit.
The tyre pressure monitor is faulty.
G
WARNING
The system is possibly unable to detect or register low tyre pressure.
There is a risk of an accident.
X
Observe the additional display messages in the multifunction display.
X
Consult a qualified specialist workshop immediately.
258
Warning and indicator lamps in the instrument cluster
On-board computer and displays

Related Topics

On-board computer and displays
Important safety notes Displays and operation Menus and submenus Display messages

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