steering MERCEDES-BENZ E-CLASS SALOON 2021 Repair Manual

ASS
YS
ASS YST PL
T PL US ser
US ser vice int
vice int erv
erval display
al display F
F
unction of t
unction of t he ASSYS
he AS SYST PL
T PL US ser
US ser vice int
vice int erv
erv al dis-
al dis-
play
play The ASS
YST PLUS service inter val display on the
inst rument display informs you of the time or dis-
ta nce remaining before the next service due date.
Yo u can hide this service display using the back
button Gonthe leT-hand side of the steering
wheel.
Depending on how theve hicle is used, the
ASS YST PLUS service inter val display may shor ten
th e service inter val, e.g. in thefo llowing cases:
R Mainly short-distance driving
R When the engine is oTen leT idling for long
periods
R Intheev ent of frequent cold start phases
R V
V ehicles wit
ehicles wit h a diesel par h a diesel par ticulat
ticulate
e/lt
/lt er:
er: inthe
ev ent of frequently inter rupted rege neration of
th e diesel particulate /lter
Mercedes-Benz recommends avoiding such oper-
ating conditions. Yo
u can obtain information concerning the servic-
ing of your vehicle from a quali/ed specialist
wo rkshop, e.g. a Mercedes-Benz service cent re. Displa
Displa
ying t
ying the ser
he ser vice due date
vice due date On-board computer:
4 Service 5
ASSYST PLUS
The next service due date is displa yed. #
T
To e
o e xit t
xit t he displa y:
he displ ay:press the back button
G onthe leT-hand side of the steering
wheel.
Bear in mind thefo llowing related topic:
R Operating the on-board computer
(/ page 283). Inf
Inf
or
ormation on r
mation on r egular maint
egular maint enance w
enance work
ork *
N
NOOTE
TE Premature wearthro ugh failure to
obser veservice due dates Main
tenance workwhich is not car ried out at
th eright time or inco mplete ly can lead to
increased wear and damage totheve hicle. #
Adhere tothe prescribed service inter-
va ls. #
Always ha vethe prescribed maintenance
wo rkcar ried out at a quali/ed specialist
wo rkshop. N
No
ot
tes on special ser
es on special ser vice r
vice req
equir
uir ements
ements The prescribed service inter
val is based on nor-
mal operation of theve hicle. Ha vethe mainte-
nance workcar ried out more oTen than prescri-
bed if operating conditions are di1cult or the
ve hicle is subject toincreased stress.
The ASS YST PLUS service inter val display is only
an aid. The driver of theve hicle bears responsibil-
ity as rega rdsto whe ther maintenance work
needs tobe per form ed more oTen than speci/ed
based on the actual operating conditions and/or
loads.
Examples of arduous operating conditions:
R Regular city driving with frequent intermediate
stops
R Mainly short-distance driving Maintenance and care
359 359

#
LeT-hand
LeT-hand dr
driv
ive v
e v ehicle:
ehicle: pulltab1 upwards. #
Right-hand dr
Right-hand dr iv
ive v
e v ehicle:
ehicle: pulltab1 down-
wa rds. #
Remo ve/re extinguisher 2. Flat tyre
Flat tyre
N
No
ot
tes on
es on 0at
0attyr
tyr es
es &
W
WARNING
ARNING Risk of accident due toa 0at
tyre
A 0at tyre se verely a.ects the driving charac-
te ristics as well as the steering and braking of
th eve hicle. T
T
yr
yr es wit
es wit hout
houtr
run-0at
un-0at c
char
har act
acter
eristics:
istics: #
Do not drive with a 0at tyre. #
Change the 0at tyre immediately with an
emer gency spa rewheel or spare wheel.
Alternativel y,consult a quali/ed special-
ist workshop.
T
T yr
yr es wit
es wit h
hr
run-0at
un-0at c
char
har act
acter
eris
istics:
tics: #
Obser vethe information and warning
no tes on MOExtended tyres (run-0at
tyres). In
theev ent of a 0at tyre, thefo llowing options are
av ailable depending on your vehicle's equipment:
R V
Vehicles wit
ehicles with MOExt h MOExtended tyr
ended tyr es:
es:it is possible
to continue the journey for a short period of
time. Make sure you obser vethe no tes on
MOExtended tyres (run-0at tyres)
(/ page 376).
R V Vehicles wit
ehicles wit h a TIREFIT kit:
h a TIREFIT kit: you can repair the
tyre so that it is possible tocontinue the jour-
ney for a short period of time. Todo this, use
th e TIREFIT kit (/ page 378). R
V
Vehicles wit
ehicles wit h Mer
h Mercedes me connect:
cedes me connect: you can
make a call for breakdown assistance via the
ove rhead control panel in the case of a break-
down (/ page 338).
R All v
All v ehicles:
ehicles: change the wheel (/ page 405). N
No
ot
tes on MOExt
es on MOExt ended tyr
ended tyres
es(r
(run-0at
un-0at tyr
tyres)
es) &
W
WARNING
ARNING Risk of accident when driving in
limp-home mode
Driving in emer gency mode impai rsthe han-
dling characteristics of theve hicle. #
Do not exceed the permissible maximum
speed of the MOExtended tyres. #
Avoid any abrupt steering and driving
manoeuvres as well as driving over
obstacles (kerbs, pot holes, o.-road).
This applies, in particular, toa loaded
ve hicle. #
Stop driving in the emer gency mode if
yo u notice:
R banging noise 376 376
Breakdown assistance

can
restrict functions releva nt for saf ety sys-
te ms and impair the operating saf ety of your
ve hicle.
Yo u could lose control of theve hicle in thefo l-
lowing situations in particular:
R when braking
R intheev ent of abrupt steering manoeuvres
and/or when theve hicle's speed is not
adap tedto thero ad conditions #
Intheev ent of a short circuit or a similar
incident, contact a quali/ed specialist
wo rkshop immediatel y.#
Do not drive on. #
Always ha veworkon the battery car ried
out at a quali/ed specialist workshop. R
Further information on ABS (/ page 218)
R Further information on ESP ®
(/ page 219)
Fo r saf etyre asons, Mercedes-Benz recommends
th at you only use batteries which ha vebeen tes-
te d and appr ovedfo ryo ur vehicle byMercedes-
Benz. All v
All v ehicles ex
ehicles excep
cep t v
t vehicles wit
ehicles wit h a lit
h a lithium-ion bat-
hium-ion bat-
t
t ery
ery &
W
WARNING
ARNING Risk ofexplosion due toelec-
trostatic charge
Electrostatic charge can ignite the highly
ex plosive gas mixtu reinthe batter y. #
Todischar geany elect rostatic charge
th at may ha vebuilt up, touch the me tal
ve hicle body before handling the batter y. The high
ly0ammable gas mixtu reis created while
th e battery is charging and during starting assis-
ta nce. &
W
WARNI NG
ARNI NGDanger of chemical burns from
th e battery acid
Battery acid is caustic. #
Avoid contact with the skin, eyes or
clo thing. #
Do not lean overth e batter y. #
Do not inhale battery gases. #
Keep children away from the batter y. #
Immediately rinse bat tery acid o. thor-
oughly with plenty of clean water and
seek medical attention immediatel y. All v
All v
ehicles
ehicles
+ ENVIR
ENVIR
ONMENT
ONMENT AL NO
AL NOTE
TEEnvironmental
damage due toimproper disposal of bat-
te ries Batteries contain pollutants. It is
illegal todispose of them with the household
ru bbish. #
Dispose of batteries in an
environmentally responsible manner.
Ta ke dischar ged batteries toaqu ali/ed
specialist workshop or toa collection
point for used batteries. 382
382
Breakdown assistance

T
T
o
o w
w -st
-st ar
ar ting or to
ting or towing away
wing away P
P
er
er mitt
mitt edto
ed towing met
wing met hods (non plug-in h
hods (non plug-in h ybr
ybrid)
id) *
N
NO OTE
TE Damage from automatic braking If one of
thefo llowing functions is switched
on, theve hicle brakes automatically in cer tain
situations:
R Active Brake Assist
R Active Distance Assist DISTRONIC
R HOLD function
R Active Parking Assist
To avoid damage totheve hicle, deactivate
th ese systems in thefo llowing or similar situa-
tions: #
during towing #
in a car wash Mercedes-Benz
recommends transporting your
ve hicle in the case of a breakdown, rather than
to wing it away.
Fo rto wing, use a tow rope or tow bar with bo th
axles on thegr ound. Do not use tow bar systems. *
N
NO OTE
TE Damage totheve hicle due to tow-
ing awa y incor rectly #
Obser vethe inst ructions and no tes on
to wing away. V
V
ehicles wit
ehicles wit h r
h rear wheel dr
ear wheel dr ive
ive P
P
er
er mitt
mitt edto
ed towing met
wing met hods
hods
Bo th axles on
th egr ound Ye
s, maximum 50 km at
50 km/h
Fr ont axle
ra ised No
Re ar axle
ra ised Ye
s, if the steering wheel is
/xed in the centre position
with a steering wheel lock 4MA
4MA
TIC v
TIC v ehicles
ehicles P
P
er
er mitt
mitt edto
ed towing met
wing met hods
hods
Bo th axles on
th egr ound Ye
s, maximum 50 km at
50 km/h
Fr ont axle
ra ised No
Re ar axle
ra ised No T
T
o
o wing wit
wing wit h a r
h a raised axle:
aised axle: towing should be per-
fo rm ed byato wing compan y. P
P
er
er mitt
mitt edto
ed towing met
wing met hods (plug-in h
hods (plug-in h ybr
ybrid)
id) Mercedes-Benz
recommends transporting your
ve hicle in the case of a breakdown, rather than
to wing it away.
Fo rto wing, use a tow rope or tow bar with bo th
axles on thegr ound. Do not use tow bar systems. Breakdown assis
tance
387
387

*
N
NO
OTE
TE Damage totheve hicle due to tow-
ing awa y incor rectly #
Obser vethe inst ructions and no tes on
to wing away. Obser
vethe information on towing and transport-
ing theve hicle in theve hicle Owner's Manual. P
P
er
er mitt
mitt edto
ed towing met
wing met hods
hods
Bo th axles on
th egr ound Ye
s, maximum 50 km at
50 km/h
Fr ont axle
ra ised Ye
s, maximum 50 km at
50 km/h
Re ar axle
ra ised Ye
s, if the steering wheel is
/xed in the centre position
with a steering wheel loc k.In
thefo llowing situations, only transporting the
ve hicle is permitted:
R the display is not working
or R
thev Towing not permitted See Owner's
Manual display message appears
Ex
Ex cep
cep tion:
tion: ifth eve hicle is located in a danger
zone, it can be reco vered from the danger zone
despite the display message or the display not
wo rking.
It must not be towe d fur ther than 50 m with bo th
axles on thegr ound. A towing speed of 10 km/h
must not be exceeded. Be yond these limits, only
transporting is permitted. T
T
o
o wing t
wing t he v
he vehicle wit
ehicle wit h bot
h both axles on t
h axles on t hegr
he ground
ound #
Obser vethe no tes on the permitted towing
me thods (/ page 387). #
Make sure that the battery is connected and
ch arge d.
Obser vethefo llowing points when the battery is
dischar ged:
R the engine cannot be star ted
R the electric parking brake cannot be released
or applied R
v
v ehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: the
automatic transmission cann otbe shiTed to
position 005Cor005D
% V
Vehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: ifthe
automatic transmission cann otbe shiTed to
position 005Cor if the display does not show
anything, transport theve hicle (/ page 390).
A towing vehicle with liTing equipment is
re qu ired forve hicle transpor tation.
* NO
NOTE
TEDamage due to towing away at
ex cessively high speeds or over long dis-
ta nces The driv
etra in could be damaged when towing
at excessively high speeds or over long distan-
ces. #
Atowing speed of 50 km/h must not be
ex ceeded. #
Atowing dis tance of 50 km must not be
ex ceeded. 388
388
Breakdown assistance

&
W
W ARNI NG
ARNI NGRisk of accident when towing a
ve hicle which is too heavy
If th eve hicle tobe tow- star ted or towe daway
is heavier than the permissible gross mass of
yo ur vehicle, thefo llowing situations can
occur:
R theto wing eye may become de tach ed.
R theve hicle/trailer combination may
swer veorove rturn. #
Before tow- starting or towing away,
ch eck if theve hicle tobe tow- star ted or
to we dawa yex ceeds the permissible
gr oss mass. If a
vehicle must be tow- star ted or towe dawa y,its
permissible gross mass must not exceed the per-
missible gross mass of theto wing vehicle. #
Information on the permissible gross mass of
th eve hicle can be found on theve hicle identi-
/cation plate (/ page 415). #
V
Vehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: do not
open the driver's door or front passenger door;
the automatic transmission otherwise
automatically shiTs toposition 005D. #
Fitth eto wing eye (/ page 391). #
Fasten theto wing device.
* N
NOOTE
TE Damage due toincor rect connec-
tion of theto w bar #
Only connect theto w rope or tow bar to
th eto wing eyes. #
Deactivate the automatic locking mechanism
(/ page 84). #
Do not activate the HOLD function. #
Deactivate tow- awa y protection
(/ page 101). #
Deactivate Active Brake Assist (/ page 242). #
V
Vehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: shiTthe
automatic transmission toposition 005C. #
Release the electric parking brake. &
W
WARNING
ARNING Risk of accident due tolimited
saf ety-re lated functions during theto wing
process
Saf ety-re lated functions are limited or no lon-
ge rav ailable in thefo llowing situations:
R theve hicle is switched o..
R the brake system or po wer steering system
is malfunctioning.
R the energy supply or the on-board electri-
cal system is malfunctioning.
When your vehicle is towe daw ay, signi/cantly
more e.ort may be requ ired tosteer and
brake than is normally requ ired. #
Use a tow bar. #
Make sure that the steering wheel can
mo vefreely be fore towing theve hicle
awa y. Breakd
own assistance
389
389

%
The values displa yed in the on-board com-
puter may deviate from those of the tyre pres-
sure gauge as they referto sea le vel.At high
ele vations, the tyre pressure values indicated
by a pressure gauge are higher than those
shown bythe on-board computer. In this case,
do not reduce the tyre pressure.
R
R est
est ar
arting t
ting t he tyr
he tyr e pr
e pressur
essur e monit
e monit or
oring syst
ing syst em
em
R
R eq
eq uir
uir ements:
ements:
R The recommended tyre pressure is cor rectly
set forth ere specti veoperating status on all of
th e wheels (/ page 396).
Re start the tyre pressure monitoring system in the
fo llowing situations:
R The tyre pressure has changed.
R The wheels or tyres ha vebeen changed or
ne wly /tted. On-board computer:
4 Service 5
Tyres #
Swipe down wards on Touch Control on the
leT-hand side of the steering wheel.
The Use current pressures as new reference
values? message is shown in the Instrument
Displa y. #
Torestart, press Touch Control on the leT-
hand side of the steering wheel.
The Tyre press. monitor restarted message is
shown in the Instrument Displa y.
Cur rent wa rning message s are deleted and
th eye llow 0077 warning lamp goes out.
ATer you ha vebeen driving for a few minutes,
th e system checks whe ther the cur rent tyre
pressures are within the speci/ed range. The
cur rent tyre pressures are then accep ted as
re fere nce values and monitored.
Be sure toalso pay attention tothefo llowing rela-
te dto pic:
R Notes on tyre pressure (/ page 396) T
T
yr
yr e pr
e pr essur
essur e loss w
e loss w ar
arning syst
ning syst em
em F
F
unction of t
unction of t he tyr
he tyre pr
e pressur
essur e loss w
e loss w ar
arning syst
ning syst em
em
The tyre pressure loss warning system warnsthe
driver bymeans of display messages when there
is a se vere tyre pressure loss.
Syst
Syst em limits
em limits
The system may be impaired or may not function
particula rly in thefo llowing situations:
R incor rect refere nce values were ta ught in
R sudden pressure loss caused byafo re ign
object penetrating the tyre, forex ample
R aneven pressure loss on more than one tyre
occurs
The system has a restric ted or dela yed function
particular lyin thefo llowing situations:
R poor ground conditions, e.g. snow or grav el
R driving with snow chains
R when adopting a very sporty driving st yle with
high cornering speeds or sudden acceleration
R driving with a very heavy or lar getrailer
R driving with a high load Wheels and tyres
399
399

The tyre pressure loss
warning system is only an
aid. It is the driver's responsibility toset the tyre
pressure tothere commended cold tyre pressure
suitable forth e operating situation and tocheck
it.
Be sure toalso obser vethefo llowing fur ther rela-
te d subjects:
R Notes on tyre pressure (/ page 396)
R Displ aymessages about the tyres
(/ page 489)
R
R est est ar
arting t
ting t he tyr
he tyr e pr
e pressur
essur e loss w
e loss w ar
arning syst
ning syst em
em
R
R eq
eq uir
uir ements:
ements:
R The recommended tyre pressure is cor rectly
set forth ere specti veoperating status on all
wheels.
Re start the tyre pressure loss warning system in
th efo llowing situations:
R The tyre pressure has changed.
R The wheels or tyres ha vebeen changed or
ne wly /tted. On-board computer:
4 Service 5
Tyres #
Swipe down wards on Touch Control on the
leT-hand side of the steering wheel.
The Run Flat Indicator active Restart mes-
sage is shown in the displa y. #
Tobegin restart, press Touch Control on the
leT-hand side of the steering wheel.
The Tyre pressure now OK? message is
shown in the displa y. #
Select Yes. #
Tocon/rm restart, press Touch Control on the
leT-hand side of the steering wheel.
The Run Flat Indicator restarted message is
shown in the displa y.
ATer you ha vedriven for a few minutes, the
tyre pressure loss warning system monitors
th e set tyre pressures of all the tyres.
Be sure toalso pay attention tothefo llowing rela-
te dto pic:
R Notes on tyre pressure (/ page 396) Wheel c
Wheel c
hange
hange N
No
ot
tes on selecting,
es on selecting, /tting
/ttingand r
and replacing tyr
eplacing tyr es
es *
N
NOOTE
TE Mercedes-AMG vehicles #
Obser vethe no tes in the Supplement.
Yo u could otherwise failto recognise
dangers. &
W
WARNING
ARNING Risk of accident due toincor-
re ct wheel and tyre dimensions
If wheels and tyres of the wrong size are /t ted,
th e service brakes or components in the brake
system and in the wheel suspension may be
damaged. #
Alwaysre place wheels and tyres with
th ose that ful/l the speci/cations of the
original part.
Fo r wheels, pay attention tothefo llowing:
R Designation
R Type 400
400
Wheels and tyres

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions #
Ifth e display message still appears, consult a quali/ed specialist workshop.
Head-up display inoperative *The head-up displ ayhas an internal er ror. #
Consult a quali/ed specialist workshop.
Ù
Steering malfunction
Increased physical effort
See Owner's Manual *T
he po wer steering assistance is malfunctioning. &
W WARNING
ARNING Risk of an accident due toaltered steering characteristics
If th e po wer assistance of the steering fails partially or comple tely,yo u will need touse more forc eto stee r. #
If safe steering is possible, drive on carefull y. #
Visit or consult a quali/ed specialist workshop immediatel y. Ù
Steering malfunction Stop
immediately See Owner's
Manual *T
he steering is malfunctioning. Steering capability is signi/cantly impaired. &
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. Active bonnet malfunction
See Owner's Manual
*T
he active bonn et(pedest rian pr otection) is malfunctioning or inoperative aTer having already been triggered. #
Consult a quali/ed specialist workshop. Displ
aymessages and warning/indicator lamps
455 455

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
Active Steering Assist cur-
rently unavailable See Own-
er's Manual *A
ctive Steering Assist is temp orarily una vailable.
The ambient conditions are outside the system limits (/ page 235).
As soon as the ambient conditions are within the system limits, the system will become available again. #
Drive on #
Check the tyre pressure if necessar y.
Active Steering Assist inop-
erative *A
ctive Steering Assist is malfunctioning. Active Distance Assist DISTRONIC remains available. #
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.
Active Steering Assist cur-
rently unavailable due to
multiple emergency stops *A
ctive Steering Assist is temp orarily una vailable due tomultiple emer gency stops. #
Take ove rth e steering and stop in accordance with the tra1c conditions. #
Switch theve hicle o. and switch it back on
Ac tive Steering Assist is available once more.
Beginning emergency stop *Your hands are not on the steering wheel. An emer gency stop is being initia ted (/ page 238). #
Put your hands back on the steering wheel.
Yo u can cancel the deceleration at any time byper form ing one of thefo llowing actions:
R Steering 472 472
Display messages and
warning/indicator lamps