MERCEDES-BENZ B-CLASS HATCHBACK 2022 Owners Manual

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.498
Display messages and warning/indicator lamps

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 250).

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 231).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. 502
Display messages and warning/indicator lamps

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. Display messages and warning/indicator lamps
503

1, 2, 3 ...
360° camer a
Care...................................................... 356
Function................................................ 266
Switching automatic mode on/oM
(reversing camera)................................. 269 A
A/C function A

ctivating/deactivating (operating
unit)....................................................... 162
MBUX.................................................... 162
ABS , Anti-lock braking system...................... 230
Acceleration Kickdown............................................... 195
Accident ERA-GLONASS test mode...................... 334
Accident, emergency call ............................. 331
Acoustic locking veriNcation signal, acti-
vating/deactivating........................................ 84
Acoustic presence indicator , Sound gen-
erator.......................................................... 170 Acoustic Vehicle Indication
, Sound g
ener-
ator.............................................................. 170
Active Blind Spot Assist Brake application................................... 259
Exit warning........................................... 258
Function................................................ 258
Trailer operation..................................... 259
Active bonnet, Pedestrian protection............ 345
Active bonnet (pedestrian protection) Resetting............................................... 345
Active Brake Assist Function................................................ 250
Setting................................................... 254
Active Distance Assist DISTRONIC Activate/deactivate variable limiter........ 243
Activating/deactivating.......................... 243
Active Emergency Stop Assist................ 249
Calling up a speed................................. 243
Function................................................ 241
Increasing/decreasing the speed........... 243
Route-based speed adaptation............... 245
Storing a speed...................................... 243
Active Lane Keeping Assist Activating/deactivating.......................... 263 Function................................................ 260
Se tting the sensitivity............................. 263
Trailer operation..................................... 260
Active light function ..................................... 145
Active Parking Assist Exiting a parking space.......................... 276
Function................................................ 273
Parking.................................................. 275
Active Service System PLUS,
ASSYST PLUS.............................................. 343
Active Speed Limit Assist ............................. 245
Active Steering Assist Activating/deactivating.......................... 249
Active Emergency Stop Assist................ 249
Function................................................ 247
Adaptive brake lights .................................... 235
Adaptive cruise control , Active Distance
Assist DISTRONIC........................................ 245
Adaptive Highbeam Assist , High beam
Activating/deactivating.......................... 148
Function................................................ 147
Adaptive Highbeam Assist Plus Function................................................ 148 504
Index

Switching on/oM
.................................... 149
AdBlue n
Additives................................................ 409
Capacity................................................ 409
Notes..................................................... 200
Purity..................................................... 409
Topping up............................................. 201
Additional door lock ....................................... 86
Additives AdBlue n
......................................... 201, 409
Engine oil............................................... 410
Fuel....................................................... 406
Aser-sales service, ASSYST PLUS................. 343
Air conditioning menu Air distribution....................................... 163
Calling up.............................................. 162
Climate control...................................... 162
Stationary heater/ventilation................. 168
Air distribution MBUX multimedia system....................... 163
Setting................................................... 161
Air inlet ........................................................ 352
Air pressure ................................................. 383 Air vents
Se tting................................................... 168
Air/water duct............................................. 352
Airbag, Occupant safety Automatic front passenger airbag shut
oM............................................................ 56 Deployment............................................. 48
Front airbag............................................. 53
Overview.................................................. 53
PASSENGER AIR BAG indicator lamps...... 58
Protection................................................ 54
Reduced protection.................................. 55
Warning lamp........................................... 48
AirOow Setting................................................... 161
Alarm system , ATA....................................... 104
All-wheel drive, 4MATIC................................ 196
Ambient lighting ........................................... 150
Animals, Pets in the vehicle............................ 81
Anti-lock braking system , ABS...................... 230
Anti-thes alarm system , ATA......................... 104
Anti-thes protection, ATA
Additional door lock................................. 86 Immobiliser............................................ 104
Anticipat ory operating-mode strategy ,
Route-based................................................. 185
Approval numbers ........................................ 402
Apps Mercedes me calls................................. 321
Mercedes me connect........................... 325
Assembly licence plate, front .......................... 29
Assistance system , Driving safety system..... 229
ASSYST PLUS Battery disconnection periods................ 344
Service interval display.......................... 343
Service requirements............................. 343
ATA, Anti-thes protection
Deactivating the alarm........................... 105
Function................................................ 104
Interior protection.................................. 106
Tow-away protection...................... 105, 106
ATTENTION ASSIST Function................................................ 236
Setting................................................... 237
Attention assistant , ATTENTION ASSIST........ 236
Authorised workshop ...................................... 41 Index
505

Automatic car wash
...................................... 352
Automatic car wash mode .................... 352, 354
Automatic climate control ............................ 162
Automatic distance control , Active Dis-
tance Assist DISTRONIC............................... 241
Automatic driving lights................................ 143
Automatic emergency call , Mercedes-
Benz emergency call system......................... 332
Automatic engine start/stop , ECO start/
stop function................................................ 180
Automatic front passenger airbag shutoM
Function.................................................. 56
PASSENGER AIR BAG indicator lamps...... 58
Automatic measures aser an accident ,
Occupant safety............................................. 61
Automatic mirror folding function................. 160
Automatic transmission Changing gear........................................ 191
DIRECT SELECT lever............................. 191
Drive programs...................................... 186
DYNAMIC SELECT switch....................... 186
Engaging drive position.......................... 193
Engaging neutral.................................... 192 Engaging reverse gear............................ 192
F aulty gear shis..................................... 194
Kickdown............................................... 195
Manual shising ...................................... 194
Selecting park position........................... 193
Steering wheel gearshis paddles............ 194
Transmission position display................. 191
Transmission positions........................... 191
Autonomous braking .................................... 250
AVAS , Acoustic vehicle alerting system......... 170
Axle load Trailer operation..................................... 419 B
Bag hook .....................................................

132
Ball neck Folding out/in........................................ 280
Trailer coupling...................................... 281
BAS , Brake Assist System............................. 231
Battery (12 V battery) Notes..................................................... 369
Replacing............................................... 372
Starting assistance................................ 370 Battery (high-voltage on-board electrical
sy
stem) ........................................................ 415
Battery (key) .................................................. 85
Battery (starter battery) Charging via Remote Online................... 175
Battery operation , Plug-in hybrid operation... 170
Belt, Seat belt................................................ 49
Bicycle rack Load capacity........................................ 418
Trailer operation..................................... 283
Blind Spot Assist, Active Blind Spot Assist Activating/deactivating.......................... 260
Function................................................ 258
BlueTec AdBlue n
................................................. 200
Bluetooth n
................................................... 320
Bonnet Active bonnet......................................... 345
Opening/closing.................................... 346
Resetting (active bonnet)........................ 345
Brake Assist Active Brake Assist................................. 250 506
Index

Brake Assist System............................... 231
Br
ake Assist System , BAS............................. 231
Brake Nttings ................................................ 176
Brake Ouid .................................................... 412
Brake force distribution , EBD........................ 233
Brake lamps Adaptive brake lights.............................. 235
Brakes ABS (Anti-lock Braking System).............. 230
Active Brake Assist................................. 250
Adaptive brake lights.............................. 235
BAS (Brake Assist System)..................... 231
Driving tips............................................ 177
EBD (Electronic Brakeforce Distribu-
tion)....................................................... 233
HOLD function....................................... 233
Limited braking eMect (salt-treated
roads).................................................... 177
New/replaced brakepads/brake disks... 176
Post-collision brake.................................. 61
Recuperation......................................... 182
Running-in notes.................................... 176
Braking assistance Brake Assist System............................... 231 Breakdown
Flat tyr e................................................. 362
Overview of aids...................................... 20
Tow-starting........................................... 378
Towing away.......................................... 375
Transporting the vehicle......................... 376
Wheel change........................................ 391 C
Calls Mer

cedes me......................................... 320
Camera 360° Camera......................................... 266
Cleaning................................................ 356
Information............................................ 229
Reversing camera.................................. 263
Selecting the view.................................. 269
Car key .......................................................... 83
Car wash ...................................................... 352
Car-to-X communication Hazard warnings.................................... 314
Care 360° camera......................................... 356
Air/water duct....................................... 352 Automatic car wash............................... 352
Car par

ts............................................... 356
Decorative foil........................................ 355
Display................................................... 358
Exterior lighting...................................... 356
Head-up display..................................... 358
High-pressure cleaner............................ 354
Paint...................................................... 355
Plastic trim............................................ 358
Real wood/trim elements...................... 358
Roof lining............................................. 358
Trailer hitch............................................ 356
Vehicle interior....................................... 358
Vehicle socket for the high-voltage
battery................................................... 356
Washing by hand.................................... 355
Caring for plastic trim ................................... 358
Caring for real wood ..................................... 358
Caring for rims............................................. 356
Caring for the steering wheel ........................ 358
Caring for trim elements............................... 358
Central locking system Button..................................................... 87
Key.......................................................... 84 Index
507