stop start MERCEDES-BENZ A-CLASS SALOON 2021 Service Manual

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Solutions
ä
Fault Drive at max. 80
km/h *T
he adjustable damping is malfunctioning. The vehicle's handling characteristics may be a.ected. #
Do not drive at speeds greater than 80 km/h. #
Consult a quali/ed specialist workshop.
Parking Assist and
PARKTRONIC inoperative
See Owner's Manual *V
Vehicles wit ehicles wit h A
h Activ
ctiv e P
e Par
arking Assist
king Assist: :Ac tive Parking Assist and Parking Assist PARKTRONIC are malfunctioning.
V
V ehicles wit
ehicles wit hout A
hout Activ
ctiv e P
e Par
arking Assist
king Assist: :Pa rking Assist PARKTRONIC is malfunctioning. #
Stop theve hicle in accordance with the tra1c conditions and restart theve hicle. #
Ifth e display message still appears, consult a quali/ed specialist workshop. 450
450
Displ
aymessages and warning/indicator lamps

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T
!
÷
inoperative See Owner's
Manual *
EBD, ABS and ESP ®
are malfunctioning.
Other driving systems and driving saf ety systems (e.g. BAS) may also be malfunctioning. &
W WARNING
ARNING Risk of skidding if EBD, ABS and ESP ®
are malfunctioning
The wheels may block during braking and ESP ®
does not per form any vehicle stabilization.
The steerability and braking characteristics are heavily impaired and the braking distance may increase. In addi-
tion, other driving saf ety sy stems are swit ched o.. #
Drive on carefull y. #
Have the brake system checked immediately at a quali/ed specialist workshop. Active Brake Assist Func-
tions currently limited See
Owner's Manual *V
Vehicles wit
ehicles wit h t
h the Dr
he Dr iving Assist
iving Assist ance P
ance Pack
ackag
age:
e: Ac tive Brake Assist with cross-t ra1c function, Evasive Steering Assist or
PRE‑SAFE ®
PLUS are temp orarily una vailable or only partially available.
V
V ehicles wit
ehicles wit hout t
hout the Dr
he Driving Assist
iving Assist ance P
ance Pack
ackag
age:
e: Ac tive Brake Assist is temp orarily una vailable. #
Drive on
As soon as the ambient conditions are within the system limits, the system will become available again.
or #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra1c conditions and restart
th eve hicle. 454
454
Displ
aymessages and warning/indicator lamps

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Solutions
Active Brake Assist Func-
tions limited See Owner's
Manual *F
orvehicles with the Driving Assistance Package, thefo llowing functions may be temp orarily una vailable or only parti-
ally available:
R Active Brake Assist with cross-t ra1c function
R Evasive Steering Assist
R PRE‑SAFE ®
PLUS
V
V ehicles wit ehicles wit hout t
hout the Dr
he Driving Assist
iving Assist ance P
ance Pack
ackag
age:
e: Ac tive Brake Assist is temp orarily una vailable or only partially availa-
ble. #
Drive on
or #
Stop theve hicle in accordance with the tra1c conditions and restart theve hicle. #
Ifth e display message does not disappear: consult a quali/ed specialist workshop. Mer
Mer
cedes-Benz emerg
cedes-Benz emerg ency call syst
ency call system
em Displa
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es Possible causes/conseq
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G
Inoperative *T
he Mercedes-Benz emer gency call system is malfunctioning. The Mercedes me connect system is also malfunction-
ing. #
Consult a quali/ed speciali stwo rkshop. Displ
aymessages and warning/indicator lamps
455
455

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#
Stop vehicle Leave engine
running *T
he 12 V battery charge leve l is too lo w. #
Stop theve hicle immediately in accordance with the tra1c conditions. Do not continue driving. #
Leavetheve hicle running #
Ifth e display message disappears: drive on. #
Ifth e display message does not disappear: consult a quali/ed specialist workshop. T T
yr
yr e pr
e pr essur
essur e monit
e monit or
or Displa
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es Possible causes/conseq
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uences andM
MSolutions
Solutions
Tyre press. monitor cur-
rently unavailable *T
here is inter fere nce from a po werful radio signal source. As a result, no signals from the tyre pressure sensors are
being received. The tyre pressure monitoring system is temp orarily una vailable.
The tyre pressure monitoring system will restart au tomatically as soon as the cause has been recti/ed. #
Drive on.
Tyre press. monitor inoper-
ative *T
he tyre pressure moni toring system is malfunctioning. &
W WARNI NG
ARNI NGThere 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.
Ty res with insu1cient 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. 458
458
Displ
aymessages and warning/indicator lamps

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Solutions
h
Rectify tyre pressure *T
he tyre pressure is too low in at least one of the tyres, or the di.erence in tyre pressure between the individual
wheels is toogr eat. #
Check the tyre pressure and add air, if necessar y. #
When the tyre pressure is cor rect, restart the tyre pressure monitoring system (/ page 367).
h Warning tyre defect *T
he tyre pressure in one or more tyres has dropped suddenl y.The wheel position will be displa yed. &
W
WARNING
ARNING Risk of an accident from driving with a 0at tyre
R The tyres can overheat and be damaged.
R The driving characteristics as well as the steering and braking characteristics may be greatly impaired.
Yo u could then lose control of theve hicle. #
Do not drive with a 0at tyre. #
Do not exceed the maximum permissible driving distance in emer gency mode and the maximum permissible
speed with a 0at MOExtended tyre. #
Obser vethe no tes on 0at tyres. No
tes in theev ent of a 0at tyre (/ page 342). #
Stop theve hicle in accordance with the tra1c conditions. #
Check the tyres. 460
460
Display messages and
warning/indicator lamps

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Solutions &
W
WARNING
ARNING Risk of an accident due toinsu1cient tyre pressure
R The tyres can burst.
R The tyres can wearexcessively and/or une venly.
R The driving characteristics as well as the steering and braking may be greatly impaired.
Yo u could then lose control of theve hicle. #
Obser vethere commended tyre pressures. #
Adjust the tyre pressure if necessar y. #
Stop theve hicle in accordance with the tra1c conditions. #
Check the tyre pressure (/ page 364) andthe tyres. #
When the tyre pressure is cor rect, restart the tyre pressure loss warning system (/ page 367).
Check tyre pressures then
restart Run Flat Indicator *T
he tyre pressure loss warning system generated a display messa geand has not been restar ted since. #
When the tyre pressure is cor rect, restart the tyre pressure loss warning system (/ page 367).
Run Flat Indicator inopera-
tive *T
he tyre pressure loss warning system is malfunctioning. #
Consult a quali/ed specialist workshop. 462 462
Displ
aymessages and warning/indicator lamps

Overview.................................................
.52
PA SSENGER AIR BAG indicator la mps...... 57
Pr otection................................................ 53
Re duced pr otection.................................. 55
Side airbag.............................................. 52
Wi ndow airbag......................................... 52
Air0 ow
Air0ow
Setting................................................... 147
Alar Alar m syst m syst em
em
see ATA (anti-theT alarm system)
All-wheel dr
All-wheel dr ive
ive
see 4M ATIC
Ambient lighting
Ambient lighting Setting (MBUX multimedia system)........ .138
Andr
Andr oid A
oid A uto
uto
see Smartphone integ ration
Animals
Animals Pets in theve hicle.................................... 80
Anti-loc
Anti-loc k br
k braking syst
aking syst em
em
see ABS (Anti-lock Braking System)
Anti-skid c
Anti-skid c hains
hains
see Sn owchains Anti-t
Anti-theT
heTprot
pr otection
ection
Ad ditional door loc k................................. 86
Immobiliser............................................ 101
Anti-t
Anti-theT heTprot
pr otection
ection
see ATA (anti-theT alarm system)
Anticipat
Anticipat or
ory occupant pr ot
y occupant pr otection
ection
see PRE-SAFE ®
(anticipatory occu-
pant pr otection)
see PRE-SAFE ®
PLUS (anticipatory
occupant pr otection plus)
Apple CarPlay
Apple CarPlay ®
®
see Smartphone integ ration
Assist Assist ance syst ance syst ems
ems
see Driving saf ety sy stem
ASS YS
ASS YST PL
T PL US
US
Battery disconnection period s................ 325
Displaying the service due dat e.............. 324
Fu nction/no tes...................................... 324
Re gular maintenance work..................... 324
Special service requ irements................. 324
AT
ATA A(anti-t
(anti-theT heTalar
alarm syst
m syst em)
em)
Deactivating the alarm........................... 102
Fu nction................................................ 101
Interior pr otection function.....................1 03Priming/deactivating interior pr
otec-
tion........................................................ 103
Priming/deactivating tow- awa y pro-
te ction................................................... 102
To w- awa y protection function................. 102
A
A TTENTION ASSIST TTENTION ASSIST
Function................................................ 221
Setting.................................................. .223
System limitations.................................. 221
A A tt tt ention assist
ention assist ant
ant
see ATTENTION ASSIST
A
A ut
ut hor
hor ised w
ised w ork
orkshop
shop
see Quali/ed specialist workshop
A
A ut
ut omatic car w
omatic car w ash mode
ash mode
Ac tivating............................................... 333
A
A ut
ut omatic co-dr
omatic co-dr iv
iver airbag
er airbag shut
shuto.
o.
Fu nction of co-driver airbag shuto........... 56
A
A ut
ut omatic dist
omatic dist ance contr
ance control
ol
see Active Distance Assist DISTRONIC
A
A ut
ut omatic dr
omatic dr iving lights
iving lights ................................ 131
A
A ut
ut omatic engine st
omatic engine st art
art
see ECO start/stop function 486
486
Index

Displa
Displa
y messag
y messag es
es
ç - - - km/h..................................... 441
È - - - km/h..................................... 441
h - - - km/h..................................... 440
# 12 V battery See Owner's Man-
ual......................................................... 456
ò Acoustic presence indicator
inoperative............................................ .415
: Active Light System inoperative..... 409
¯ AdBlue system fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km.................................................. 465
¯ AdBlue system fault Emer gency
op. in XXX miles See Owner's Manual.... 464
¯ AdBlue system fault Engine
start not possible................................... 465
¯ AdBlue system fault See Own-
er's Manual............................................ 464
5 Add 1 litre engine oil when next
re fuelling ............................................... 466 é
ATTENTION ASSIST inoperati ve..... 440
é ATTENTION ASSIS T:Take a
break!.................................................... 440
: Automatic driving lights inoper-
ative...................................................... 409
Û Battery overheated Stop, every-
body out! Outdoors if possible ................ 417
û Before starting the engine, turn
th e steering wheel.................................. 424
J Brake immediately ........................ 438
Á Change key batteries .................... 406
è Charger cable connected .............. 415
J Check brake 0uid le vel.................. 439
ï Check trailer hitch lock (white
display message) .................................... 421
h Check tyre(s) ................................ 459
! Clean the fuel /lter....................... 429
ÿ Coolant Stop vehicle Switch
engine o............................................... 428 !
currently una vailable See Own-
er's Manual............................................4 51
÷ currently una vailable See Own-
er's Manual............................................4 52
5 Engine oil le vel cannot be meas-
ured....................................................... 467
5 Engine oil le velRe duce oil le vel..... 466
5 Engine oil le velSt op vehicle
Switch engine o.................................... 466
5 Engine oil pressure Stop Switch
o. engine.............................................. 467
ä Fault Drive at max. 80 km/h ......... 450
6 Front leT malfunction Consult
wo rkshop (e xample)...............................4 03
& inoperative Battery low................. 412
& inoperative Char geHV battery...... 413
& inoperati veHigh-voltage battery
ch arging inco mplete ............................... 413
& inoperative Refuel vehicle............. .413
& inoperative See Owner's Man........ 412 492 492
Index

!
inoperative See Owner's Manual... 452
÷ inoperative See Owner's Manual... 453
T inoperative See Owner's Manual... 454
G Inoperative................................... 455
: Intelligent Light System inopera-
tive........................................................ 410
Á Key being initialised Please wait.... 407
Á Key not de tected (red display
message).............................................. .407
Á Key not de tected (white display
message).............................................. .407
: LeT dipped beam (e xample).......... 408
6 LeT windowbag malfunction
Consult workshop (e xample).................. 404
: Malfunction See Owner's Man-
ual.........................................................4 09
Û Malfunction Visit workshop ........... 418
d Malfunction.................................. 419
Û Malfunction.................................. 418
ð Maximum speed exceeded ............ 443 ç
O................................................. 442
ë O................................................. 439
! Parking brake See Owner's
Manual..................................................4 35
d Performance se verely limited........ 419
6 Please wait Depressurising tank .... 420
& Pre-entry clima tecont rol (via
ke y) available again aTer engine start..... 414
& Pre-ent ryclimate cont rol (via
ke y) inoperati veHV-battery low .............. 414
h Rectify tyre pressure ..................... 460
Ú Re/ll AdBlue See Owner ’sMan-
ual ......................................................... 463
! Release parking brake ...................437
¸ Replace air cleaner ....................... 429
Á Replace key.................................. 406
æ Reser vefuel le vel.......................... 429
6 Restraint sys. malfunction Con-
sult workshop ....................................... .402
# See Owner's Manual..................... 456 Ù
Steering malfunction Increased
ph ysical e.ort See Owner's Manual.......4 23
Ù Steering malfunction See Own-
er's Manual ............................................ 424
Ù Steering malfunction Stop
immediately See Owner's Manual ........... 423
d Stop Switch engine o.................. .419
# Stop vehicle Lea veengine run-
ning ....................................................... 458
# Stop vehicle See Owner's Man-
ual......................................................... 457
ç suspended .................................... 441
: Switch o. lights............................ 410
: Switch on headlamps .................... 410
6 Tank is dep ressurised Ready for
re fuelling ............................................... 420
6 Tank ventilation Malfunction
Consult workshop ................................. .420
á temp orarily una vailable Camera
view restric ted....................................... 449 Index
493 493

¸
temp orarily una vailable Sensors
dirty....................................................... 448
Ú Top up AdBlue Emer gency op. in
XXX miles See Owner's Manual.............. 463
+ Top up coolant See Owner ’s
Manual.................................................. 427
¥ Top up washer 0uid...................... .426
u Towing not permitted See Own-
er's Manual ............................................ 415
d Trans. oil overheated Drive on
with care................................................ 432
! Turn on the ignition torelease
th e parking brake ................................... 438
Ú .................................................... 463
d Vehicle is operational Switch o.
ignition before exiting............................. 421
h Warning tyre defect....................... 460
h Wheel sensor(s) missing ................ 459Ú
XX,X l Top up AdBlue Swit chon
ignition, wait 60 sec. or eng. start not
poss...................................................... 464
"Electric" drive prog ram cur rently
una vailable............................................. 417
Ac tive Blind Spot Assist cur rently
una vailable See Owner's Manual ............ 446
Ac tive Blind Spot Assist inoperative........ 446
Ac tive Blind Spot Assist not available
when towing a trailer See Owner's
Manual.................................................. 447
Ac tive bonnet malfunction See Own-
er's Manual............................................ 424
Ac tive Brake Assist Functions cur-
re ntly limi ted See Owner's Manual .........454
Ac tive Brake Assist Functions limi ted
See Owner's Manual.............................. 455
Ac tive Distance Assist available again ..... 443
Ac tive Distance Assist cur rently
una vailable See Owner's Manual ............ 442Ac
tive Distance Assist inoperative.......... 442
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual ............ 447
Ac tive Lane Keeping Assist inoperative... 447
Ac tive Steering Assist cur rently
una vailable due tomultiple emer-
ge ncy stops........................................... 444
Ac tive Steering Assist cur rently
una vailable See Owner's Manual ............ 444
Ac tive Steering Assist inoperative...........4 44
Ad aptive Highbeam Assist cur rently
una vailable See Owner's Manual ............ 410
Ad aptive Highbeam Assist inoperative ....4 11
Ad aptive Highbeam Assist Plus cur-
re ntly una vailable See Owner's Manual ... 411
Ad aptive Highbeam Assist Plus inop-
erative.................................................. .411
Anti-theT alarm system Malfunction ....... 426
Apply brake todeselect Park (P) posi-
tion....................................................... .430 494 494
Index