MERCEDES-BENZ A-CLASS HATCHBACK 2022 Owners Manual

Warning/indicator lamp Possible causes/consequences and
P Solutions
Note the messages on the instrument display.
If the coolant temperature display is at the lower end of the temperature scale: 
Consult a qualiNed 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 (  pag
e 342). 
Make sure that the air supply to the radiator is not obstructed. 
Avoiding high loads on the engine, drive to the nearest q
ualiNed specialist workshop. In doing so, ensure that the
coolant temperature display remains below 120°C.

Warning/indicator lamp Possible causes/consequences and
P Solutions

Brakes
Warning/indicator lamp Possible causes/consequences and
P Solutions
$
Electr ic parking brake indi-
cator lamp (red)
$
Electric parking brake indi-
cator lamp (yellow) * The red electric parking brake indicator lamp
Oashes or is lit.
The y
ellow electric parking brake indicator lamp is also lit in the event of a malfunction. 
Note the messages on the instrument display.
M
Br
ake system warning lamp
(yellow) * The yellow brake warning lamp is lit while the vehicle is running. &
WARNING Risk of an accident due t o 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 q
ualiNed specialist workshop. 
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. 490
Display messages and warning/indicator lamps

Warning/indicator lamp Possible causes/consequences and
P Solutions
Consult a qualiNed specialist workshop.
M
Br
ake system warning lamp
(red) * The red brake warning lamp is lit while the vehicle is running.
Possible causes:
= The br
ake force boosting is malfunctioning and the braking characteristics may be aMected.
= There is insuPcient brake Ouid in the brake Ouid reservoir. 
Note the messages on the instrument display. &
WARNING Risk of accident and injur
y if brake force boosting is malfunctioning
If brake force boosting is malfunctioning, increased brake pedal force may be necessary for braking. The braking
c
haracteristics may be impaired. The braking distance can increase in emergency braking situations. 
Stop in a safe location immediately. Do not continue driving! 
Consult a q
ualiNed specialist workshop. &
WARNING Risk of an accident due t
o low brake Ouid level
If the brake Ouid le
vel is too low, the braking eMect and the braking characteristics may be impaired. 
Stop the vehicle as soon as possible, paying attention to road and tr
aPc conditions. Do not continue driving. 
Consult a q
ualiNed specialist workshop. 
Do not top up the brake Ouid. Display messages and warning/indicator lamps
491

Driving systems
Warning/indicator lamp Possible causes/consequences and
P Solutions
/
W arning lamp for distance
warning function * 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 t here 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 (  pag
e 244).

Driving safety systems
Warning/indicator lamp Possible causes/consequences and
P Solutions
%
ABS w arning lamp * The yellow ABS warning lamp is lit while the vehicle is running.
ABS is malfunctioning.
If an additional w
arning tone sounds, EBD is malfunctioning.
Other driving systems and driving safety systems may also be malfunctioning. 
Note the messages on the instrument display. &
WARNING Ther
e is a risk of skidding if EBD or ABS is malfunctioning
The wheels may lock during braking.
The s
teerability and braking characteristics are heavily impaired and the braking distance may increase. In addition,
other driving safety systems are switched oM. 
Drive on carefully. 
Have the brake system checked immediately at a q
ualiNed specialist workshop.

Warning/indicator lamp Possible causes/consequences and
P Solutions

Warning/indicator lamp Possible causes/consequences and
P Solutions
If ESP n
canno t be activated, ESP n
is malfunctioning. 
Have ESP n
c
hecked immediately at a qualiNed specialist workshop. 
Observe the notes on deactivating ESP n
( pag
e 225).Tyre pressure monitor
Warning/indicator lamp Possible causes/consequences and
P Solutions
w
T
yre pressure monitoring
system warning lamp Oashes*The yellow tyre pressure monitor warning lamp (pressure loss/malfunction)
Oashes f
or approximately one minute and
then remains lit.
The tyre pressure monitoring system is malfunctioning. &
WARNING Ther
e 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.
T
yres with insuPcient tyre pressure may impair the driving characteristics as well as steering and braking. 
Have the tyre pressure monitoring system checked at a q
ualiNed specialist workshop. Display messages and warning/indicator lamps
495

Warning/indicator lamp Possible causes/consequences and
P Solutions
w
T yre 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 t
o insuPcient tyre pressure
= The tyr
es can burst.
= The tyres 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 tyre pressures. 
Adjust the tyre pressure if necessary. 
Stop the vehicle in accordance with the tr
aPc conditions. 
Check the tyre pressure and the tyres. 496
Display messages and warning/indicator lamps

1, 2, 3 ...
360° camer a
Care...................................................... 348
Function................................................ 260
Switching automatic mode on/oM
(reversing camera)................................. 263 A
A/C function A

ctivating/deactivating (operating
unit)....................................................... 156
MBUX.................................................... 156
ABS , Anti-lock braking system...................... 225
Acceleration Kickdown............................................... 189
Accident ERA-GLONASS test mode...................... 327
Accident, emergency call ............................. 325
Acoustic locking veriNcation signal, acti-
vating/deactivating........................................ 85
Acoustic presence indicator , Sound gen-
erator.......................................................... 164 Acoustic Vehicle Indication
, Sound g
ener-
ator.............................................................. 164
Active Blind Spot Assist Brake application................................... 254
Exit warning........................................... 252
Function................................................ 252
Trailer operation..................................... 254
Active bonnet, Pedestrian protection............ 337
Active bonnet (pedestrian protection) Resetting............................................... 337
Active Brake Assist Function................................................ 244
Setting................................................... 248
Active Distance Assist DISTRONIC Activate/deactivate variable limiter........ 237
Activating/deactivating.......................... 237
Active Emergency Stop Assist................ 243
Calling up a speed................................. 237
Function................................................ 235
Increasing/decreasing the speed........... 237
Route-based speed adaptation............... 240
Storing a speed...................................... 237
Active Lane Keeping Assist Activating/deactivating.......................... 257 Function................................................ 255
Se tting the sensitivity............................. 257
Trailer operation..................................... 255
Active light function ..................................... 139
Active Parking Assist Exiting a parking space.......................... 271
Function................................................ 268
Parking.................................................. 269
Active Service System PLUS,
ASSYST PLUS.............................................. 335
Active Speed Limit Assist ............................. 239
Active Steering Assist Activating/deactivating.......................... 243
Active Emergency Stop Assist................ 243
Function................................................ 241
Adaptive brake lights .................................... 230
Adaptive cruise control , Active Distance
Assist DISTRONIC........................................ 240
Adaptive Highbeam Assist , High beam
Activating/deactivating.......................... 142
Function................................................ 141
Adaptive Highbeam Assist Plus Function................................................ 142 Index
497