steering MERCEDES-BENZ A-CLASS HATCHBACK 2021 Repair Manual

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es Possible causes/conseq
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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. 462
462
Displ
aymessages and warning/indicator lamps

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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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uences andM
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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
463
463

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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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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. 466
466
Displ
aymessages and warning/indicator lamps

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Tyre press. monitor inoper-
ative No wheel sensors *T
he wheels /tted do not ha vesuitable tyre pressure senso rs. The tyre pressure monitoring system is deactivated. #
Fit wheels with suitable tyre pressure sensors.
h
Wheel sensor(s) missing *T
here is no signal from the tyre pressure sensor of one or more wheels. No pressure value is displa yedfo rth e a.ected
tyre. #
Have thefa ulty tyre pressure sensor replaced at a quali/ed specialist workshop.
h
Check tyre(s) *T
he tyre pressure in one or more tyres has dropped signi/cantl y.
The wheel position is displa yed. A warning tone also sounds. &
W WARNI NG
ARNI NGRisk 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 369) andthe tyres. Display messages and
warning/indicator lamps
467
467

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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 372).
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 348). #
Stop theve hicle in accordance with the tra1c conditions. #
Check the tyres. 468
468
Display messages and
warning/indicator lamps

Displa
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y messag
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es Possible causes/conseq
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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 369) andthe tyres. #
When the tyre pressure is cor rect, restart the tyre pressure loss warning system (/ page 372).
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 372).
Run Flat Indicator inopera-
tive *T
he tyre pressure loss warning system is malfunctioning. #
Consult a quali/ed specialist workshop. 470 470
Displ
aymessages and warning/indicator lamps

W
W
ar
ar ning and indicat
ning and indicat or lam
or lamps
ps Ov
Ov
er
ervie
vie w of indicat
w of indicat or and w
or and war
arning lam
ning lam ps
ps Some systems will per
form a self-test when the
ve hicle is switched on. Some indicator and warn-
ing lamps may brie0y light up or 0ash. This beha v-
iour is non-critical. These indicator and warning
lamps indicate a malfunction only if they light up
or 0as haTer theve hicle has been star ted or dur-
ing a journe y.
S
S t
tandar
andar d ins
d instr
trument displ ay
ument display W
W
idescr
idescr een coc
een coc kpit ins
kpit instrtrument display
ument display Depending on
the display setting, the positions of
th e indicator lamps on the inst rument display may
di.er from theex ample shown.
Indicat
Indicat or and w
or and w ar
arning lam
ning lam ps:
ps:
6 Restraint system (/ page 477)
ü Seat belt (/ page 477)
_ Reduced po wer (/ page 479)
Ú System error (/ page 479)
# Electricalfault (/ page 479)
ï Trailer hitch (/ page 480)
Ù Powe r steering (/ page 480) ÿ
V
V ehicles wit
ehicles wit h a widescr
h a widescr een coc
een coc kpit
kpit:
:
coolant temp erature (/ page 481)
; Engine diagnostics (/ page 481)
% V
Vehicles wit
ehicles wit h a diesel engine:
h a diesel engine: preglow
# Electricalfault (/ page 481)
æ Reser vefuel wi thfuel /ller 0ap loca-
tion indicator (/ page 481)
! Electric parking brake (red)
(/page 485)
! Electric parking brake (yellow)
(/page 485)
J Brakes (yellow) (/ page 485)
J Brakes (red) (/ page 485)
L Distancewarning (/ page 487)
Ó Active Brake Assist (/ page 487)
ê Active Brake Assist (/ page 487)
! ABS (/page 488)
÷ ESP®
(/ page 488)
å ESP®
OFF (/ page 488) 476 476
Display messages and
warning/indicator lamps

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
#
Electrical fault warning lamp *T
hered electrical fault warning lamp is lit.
There is a fault with the electrics. #
Notethe messages on the instrument displa y.V
V
ehicle
ehicle W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
Ù
Po we r steering warning
lamp (red) *T
he red po wer steering warning lamp is lit while theve hicle is running.
The po wer assistance or the steering itself is malfunctioning. &
W
WARNING
ARNING Risk of accident if steering capability is impaired
If th e steering does not function as intended, theve hicle's operating saf ety is jeopardised. #
Pull over and stop theve hicle safely as soon as possible, paying attention toroad and tra1c conditions. Do not
continue driving under any circums tances. #
Consult a quali/ed speciali stwo rkshop. #
Notethe messages on the instrument displa y.480
480
Display message
s andwarning/indicator lamps

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
If ESP ®
cannot be activated, ESP ®
is malfunctioning. #
Have ESP ®
ch ecked immediately at a quali/ed specialist workshop. #
Obser vethe no tes on deacti vating ESP ®
(/ page 222). T
T
yr
yr e pr
e pr essur
essur e monit
e monit or
or W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
h
Ty re pressure monitoring
system warning lamp 0ashes *The
yellow tyre pressure monitor warning lamp (pressure loss/malfunction) 0ashes for appr oximately one minute and
th en remains lit.
The tyre pressure monitor is malfunctioning. &
W
WARNING
ARNING There 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. 490
490
Displ
aymessages and warning/indicator lamps

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
h
Ty re pressure monitoring
system warning lamp lights
up *T
he yellow tyre pressure monitoring system warning lamp (pressure loss/malfunction) is lit.
The tyre pressure monitoring system has de tected tyre pressure loss in at least one of the tyres. &
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 and the tyres. Display messages and
warning/indicator lamps
491
491