trailer MERCEDES-BENZ S-CLASS SALOON LONG 2021 Owners Manual

1
#! Turn signal lights →
171
2 ï Trailer hitch →
575
3 ä Suspension (red) →
584
ä Suspension (yellow) →
584
4 # Electrical fault →
578
5 Ù Powe r steering (red) →
575
Ù Powe r steering (yellow) →
575
Ù Rear axle steering (red) →
575
Ù Rear axle steering (yellow) →
575
6 6 Restraint system →
573
7 ü Seat belt →
573
8 L Distance warning →
584
9 ! ABS →
586
A h Tyre pressure monitoring system →
589
B ; Engine diagnostics →
578
C å ESP®
OFF →
586 ÷
ESP®
→
586
D % Diesel engine: preglow
E ÿ Coolant temp erature →
578
F Coolant temp erature display
G ! Electric parking brake (yellow) →
581
H ! Electric parking brake (red) →
581
I J Brakes (red) →
581
J Brakes (yellow) →
581
J 8 Reser vefuel wi thfuel /ller 0ap location
indicator →
578
K Fuel le vel
L K High beam →
171
L Low beam →
169
T Standing lights →
169
M R Rear fog light →
170
N H Mercedes-Benz emer gency call system →
588 At
a glance – Indicator and warning lamps (standard)
11
11

1
#! Turn signal lights →
171
2 ü Seat belt →
573
3 L Distance warning →
584
4 6 Restraint system →
573
5 h Tyre pressure monitoring system →
589
6 å ESP®
OFF →
586
÷ ESP®
→
586
7 ! ABS →
586
8 % Diesel engine: preglow
9 ÿ Coolant temp erature →
578
A Coolant temp erature display
B ! Electric parking brake (yellow) →
581
C ! Electric parking brake (red) →
581
D J Brakes (red) →
581
J Brakes (yellow) →
581
E 8 Reser vefuel wi thfuel /ller 0ap location
indicator →
578 F
Fuel le vel
G R Rear fog light →
170
H K High beam →
171
L Low beam →
169
T Standing lights →
169
I H Mercedes-Benz emer gency call system →
588
J ï Trailer hitch →
575
K # Electrical fault →
578
L ; Engine diagnostics →
578
M Ù Powe r steering (red) →
575
Ù Powe r steering (yellow) →
575
Ù Rear axle steering (red) →
575
Ù Rear axle steering (yellow) →
575
N ä Suspension (red) →
584
ä Suspension (yellow) →
584 At
a glance – Indicator and warning lamps (with driver camera)
13
13

R
R
e
ev
ver
er sing t
sing t he PRE-S
he PRE-S AFE
AFE®
®
syst
syst em measur
em measur es
es If an accident did not occur,
the pre-em ptive
measures that we re ta ken are reve rsed.
Yo u will need toper form certain settings yourself. #
Ifth e seat belt pre-tensioning is not reduced,
mo vethe seat backrest back slightl y.
The locking mechanism releases. F
F
unction of PRE-S
unction of PRE-S AFE
AFE®
®
PL
PL US (anticipat
US (anticipat or
ory occu-
y occu-
pant pr ot
pant pr otection plus)
ection plus) PRE-SAFE
®
PLUS can de tect cer tain impacts, par-
ticular lyan imminent rear impact, and take pre-
em ptive measures toprotect theve hicle occu-
pants. These measures cann otnecessarily pre-
ve nt an imminent impact.
PRE-SAFE ®
PLUS can implement thefo llowing
measures independently of each other:
R Tightening the seat belts on the driver's seat
and front passenger seat.
R Activating there ar hazard warning lights at a
higher 0ashing frequency. R
Increasing brake pressure when theve hicle is
stationar y.This brake application is cancelled
automatically when theve hicle pulls away.
If an accident did not occur, the pre-em ptive
measures that we re ta ken are reve rsed.
Syst
Syst em limits
em limits
The system will not initiate any action in thefo l-
lowing situations:
R when reve rsing
or
R when theve hicle is towing a trailer and there
is a risk of a rear impact
The system will not initiate any braking application
in thefo llowing situations:
R whilst driving
or
R when entering or exiting a parking space while
using Active Parking Assist F F
unction of PRE-S
unction of PRE-S AFE
AFE®
®
Im
Im pulse Side
pulse Side If an imminent side impact is de
tected, PRE-
SA FE®
Impulse Side can pre-em ptively mo vethe
front seat vehicle occupant's upper body towa rds
th e centre of theve hicle. It does this by rapidly
in0ating an air cushion in the outer seat side bol-
ster of the seat backrest on the side on which the
impact is anticipated. This increases the distance
between the door and theve hicle occupant.
V
V ehicles wit
ehicles wit h E-A
h E-ACTIVE BOD
CTIVE BOD Y C
Y CONTR
ONTR OL:
OL:the body
can also be slightly raised.
If PRE-SAFE ®
Impulse Side has been deplo yed or
is faulty, thePRE-SAFE impulse side inoperative
See Owner's Manual (/page 496) display mes-
sage appears. A
A
ut
ut omatic measur
omatic measur es
esaTer
aTer an accident
an accident
Depending on the type and se verity of the acci-
dent, and depending on theve hicle's equipment,
th efo llowing measures can be implemented, for
ex ample:
R automatic braking (post-collision brake) 64
64
Occupant saf
ety

The boot lid could be opened or closed uninten-
tionall
y,in thefo llowing situations:
R A person's arms or legs are moving in the sen-
sor de tection range, e.g. when polishing the
ve hicle or picking up objects.
R Objects are mo ved or placed behind theve hi-
cle, such as a /lling pump hose, a charging
cable or lug gage.
R Clamping straps, tarp aulins or other co verings
are pulled overth e bumper.
R A pro tective mat with a leng threaching over
th e boot sill down into the de tection range of
th e sensors is used.
R The pr otective mat is not secured cor rectl y.
R Workis being done on the trailer hitch, trailers
or rear bicycle rack s.
Deactivate the function of theke y (/ page 90) or
do not car rytheke y about your person in such
situations. Switc Switc
hing separ
hing separ at
ate boo
e boo t loc
t locking on and
king on and o.
o. Multimedia system:
4 © 5
Settings 5
Vehicle
5 Open/close
Switc
Switc hing separ
hing separ at
ate boo
e boo t loc
t locking on
king on #
Select Block boot. #
Create a PIN. #
Press OKtocon/rm the PIN. #
Enter the PIN again and con/ rmit.
The boot will remain loc ked if you unlock the
ve hicle cent rally.
% If an accident has been de tected, the boot will
unlock even if separate locking is switched
on.
% You can open the boot with the emer gency
ke yeve n while boot locking is active. Sepa-
ra te boot locking will remain active.
Switc
Switc hing separ
hing separ at
ate boo
e boo t loc
t locking
king o.
o. #
Select Block boot . #
Enter the PIN.
If th e PIN is cor rect, separate boot locking will
be switched o. and the PIN dele ted.
R
R ese
ese tting t
tting t he PIN
he PIN
If yo u ha ve fo rgottenth e PIN, you can switch o.
separate boot locking with the emer gency key. #
Select Block boot. #
Con/rm Forgotten PIN? . #
Unlo ckthe boot within thre e minutes with the
emer gency key.
Separate bo otlocking will be switched o. and
th e PIN dele ted. U
Unloc
nloc king t
king t he boo
he boo t lid wit
t lid wit h t
h the emerg
he emerg encykey
ency key #
Take the emer gency key element out of the
ke y (/ page 90). #
Inse rtthe emer gency key in tothe boot lock as
fa r as it will go. Opening and closing
103
103

#
Obser vethech anged vehicle height with
add-on roof equipment. N
No
ot
tes on dr
es on dr iving wit
iving with a r
h a roof load, tr
oof load, tr ailer or fully
ailer or fully
laden v
laden v ehicle
ehicle
When driving with a loaded roof luggage rack or
trailer as well as with a fully laden or fully occu-
pied vehicle, theve hicle's driving and steering
ch aracteristics change.
Yo u should bear thefo llowing in mind:
R Do not exceed the permissible roof load and
to wing capacity. Also obser vethete ch nical
data in the printed Owner's Manual.
R Evenly distribute thero of load, and place
heavy objects at the bottom. Also comply with
th e no tes on loading theve hicle
(/ page 148).
R Drive attentivel y,and avoid suddenly pulling
awa y,braking and steering as well as rapid
cornering.
Not
Not es on dr
es on dr iving on salt-tr
iving on salt-tr eat
eated r
ed r oads
oads
The braking e.ect is limited on salt-treated roads. Therefore, obser
vethefo llowing no tes:
R due tosalt build-up on the brake disks and
brakepads, the braking distance can increase
considerably or result in braking only on one
side
R maintain a much greater safe distance tothe
ve hicle in front
To remo vesalt build-up:
R brake occasionally while paying attention to
th e tra1c conditions
R carefully depress the brake pedal at the end of
th e journey and when starting the next jour-
ney
N
No ot
tes on aq
es on aq uaplaning
uaplaning
Aq uaplaning can take place once a cer tain
amount of water has accumulate d onthero ad
sur face.
Obser vethefo llowing no tes during heavy precipi-
ta tion or in conditions in whi chaquaplaning may
occur:
R reduce speed
R avoid tyre ruts R
avoid sudden steering mo vements
R brake careful ly
% Also obser vethe no tes on regula rly ch ecking
wheels and tyres (/ page 461).
N
No ot
tes on dr
es on dr iving t
iving thr
hrough w
ough w at
ater on t
er on t he r
he road sur-
oad sur-
f
f ace
ace
Wa ter which has entered into theve hicle can
damage the engine, electrics and transmission.
Wa ter can also enter the air intake of the engine
and cause engine damage.
Obser vethefo llowing if you must drive thro ugh
wa ter:
R The water,when calm, may only reach the
lo we r edge of theve hicle body.
R Drive at a maximum speed of 10 km/h; water
can otherwise enter theve hicle interior or
engine compartment.
R Vehicles tr avelling in front, or oncoming vehi-
cles, can create waves which may exceed the
maximum permissible dep thofthewa ter.
The braking e.ect of the brakes is reduced aTer
fo rd ing. Brake carefully while paying attention to218 218
Driving and parking

%
You can also activate or deactivate manual
shiTing permanently in the multimedia sys-
te m. P
P
er
er manentl
manentl y activ
y activating or deactiv
ating or deactiv ating manual
ating manual
g
g ear c
ear c hanging
hanging Multimedia system:
4 © 5
Vehicle 5
Driving #
Perm anently switch the function on or o.. Gear
Gear
shiT
shiT r
recommendation
ecommendation The
gearshiT recommendation assists you in
adopting an economical driving style. #
Ifth ege arshiT recommendation 1appears
next tothe transmission position displa y,shiT
to there commended gear. Using kic
Using kic
kdo
kdown
wn #
Maximum acceler
Maximum acceler ation:
ation:depress the accelera-
to r pedal be yond the pressure point.
To protect against engine overrev ,th e automatic
transmission shiTs up tothe next gear when maxi-
mum engine speed has been reached. Glide mode function
Glide mode function
Wi
th an anticipatory driving st yle, Glide mode
helps youto reduce fuel consum ption.
Glide mode is characterised bythefo llowing:
R The combustion engine is disconnected from
the driv etra in and continues torun in neutral.
R The transmission position display his shown
in green.
R V Vehicles wit
ehicles wit h 48 V on-boar
h 48 V on-boar d electr
d electrical syst
ical syst em:
em:
th e combustion engine can be switched o..
All of theve hicle functions remain active. Glide mode is activated if
thefo llowing conditions
are met:
R Drive prog ram ; is selected.
R The speed is within a suitable range.
R The road's course is suitable, e.g. no steep
uphill or downhill inclines or tight bends.
R There is no trailer hitched up tothe trailer
hitch, and no bicycle rack Fitted.
R You do not depress the accelerator or brake
pedal (e xcept for light brake applications).
% Glide mode can also be activated if you ha ve
selected the "Eco" setting forth e drive in the
drive prog ram =.
Glide mode is deactivated again if one of the con-
ditions is no longer met.
Glide mode can also be pr evented bythefo llowing
parame ters:
R Incline
R Downhill gradient
R Temp erature
R Height 234 234
Driving and parking

Make sure
that there are no overhanging loads
pr otru ding into the de tection range.
If th ere is damage toa bumper or thera diator
gr ille, or aTer an impact, ha vethe function of the
senso rschecked at a quali/ed specialist work-
shop. Ha vedamage or stone chipping in the area
of the cameras on the front and rear wind ows
re paired at a quali/ed specialist workshop.
% The reve rsing camera can extend and retract
automatically forth e purpose of calibration,
ev en though there is no camera image in the
displa y. Ov
Ov
er
ervie
vie w of dr
w of dr iving syst
iving syst ems and dr
ems and dr iving safe
iving safety
ty
syst
syst ems
ems R
ABS (/ page 269)
R BAS (/ page 269)
R ESP ®
(/ page 269)
R ESP ®
Crosswind Assist (/ page 270)
R ESP ®
trailer stabilisation (/ page 271)
R EBD (/ page 271)
R STEER CONTROL (/ page 271) R
HOLD function (/ page 272)
R Hill Start Assist (/ page 273)
R Adaptive Brake Lights (/ page 273)
R ATTENTION ASSIST (/ page 274)
R Limi ter (/ page 275)
R Tra1c Sign Assist (/ page 294)
R Tra1c light view (/ page 298)
R AIRMATIC (/ page 305)
R E-AC TIVE BODY CONTROL (/ page 307)
Dr
Dr iving Assist
iving Assist ance pack
ance package
age
% The availability of some functions or sub-func-
tions of the Driving Assistance Package is
equipment- or countr y-speci/c. The functions
of your Driving Assistance Package may di.er
from the functions listed here.
R Active Distance Assist DISTRONIC
(/ page 276)
R Active Speed Limit Assist (/ page 281)
R Route-based speed adap tation (/ page 282)
R Active Brake Assist (/ page 290)
R Active Steering Assist (/ page 284) R
Active Emer gency Stop Assist (/ page 286)
R Active Lane Change Assist (/ page 288)
R Active Stop-and-Go Assist (/ page 284)
R Active Blind Spot Assist with exitwa rning
(/ page 298)
R Active Lane Keeping Assist (/ page 302)
R PRE-SAFE ®
Impulse Side (/ page 64)
P
P ar
ar king P
king P ack
ackage
age
% The availability of individual functions is coun-
try and equipment-dependent.
R Reversing camera (/ page 310)
R 360° Camera (/ page 312)
R Parking Assist PARKTRONIC (/ page 317)
R Active Parking Assist (/ page 321)
R Remo teParking Assist (/ page 326)
R Memory Parking Assist (countr y-dependent)
(/ page 333) 268
268
Driving and parking

F
F
unction of ESP
unction of ESP ®
®
tr
trailer st
ailer st abilisation
abilisation &
W
WARNING
ARNING Risk of accident in poor road
and weather conditions
In poor road and weather conditions, the
trailer stabilisation cannot pr event lur ching of
th eve hicle/trailer combination. Trailers with a
high cent reofgrav ity may tip over before
ESP ®
de tects this. #
Always adapt your driving style tosuit
th e cur rent road and weather conditions. When driving with a trailer, ESP
®
can stabilise
yo ur vehicle if the trailer begins toswer vefrom
side toside:
R ESP ®
trailer stabilisation is active abo ve
speeds of 65 km/h.
R Slight swerving is reduced bymeans of a tar-
ge ted, individual brake application on one
side.
R Intheev ent of se vere swerving, the engine
output is also reduced and all wheels are
braked. ESP
®
trailer stabilisation may be impaired or may
not function if:
R The trailer is not connected cor rectly or is not
de tected proper lyby theve hicle. A
A
ctiv
ctiv ating/deactiv
ating/deactiv ating ESP
ating ESP®
®
(Electr
(Electr onicSt
onic Stability
ability
Pr
Pr ogr
ogr am)
am) Multimedia system:
4 © 5
ß 5
y
% ESP®
can only be activated/deactivated using
qu ick access when at least one other function
is available in quick access. ESP ®
can other-
wise be found in theAssistance menu. #
Select ESP. #
Select Onorå Off.
ESP ®
is deactivated if theå ESP®
OFF warn-
ing lamp lights up continuously in the driver's dis-
pla y.
Obser veany information on warning lamps and
display message s which may be shown in the driv-
er's displa y. F
F
unction of EBD
unction of EBD Electronic Breakforce Distribution (EBD) is
char-
acterised bythefo llowing:
R Monitoring and regulating the brake pressure
on there ar wheels.
R Impr oved driving stability when braking, espe-
cially on bends. F
F
unction of S
unction of S TEER C
TEER CONTR
ONTROL
OL ST
EER CONTROL assists youby transmitting a
noticeable steering forc eto the steering wheel in
th e direction requ ired forve hicle stabilisation.
This steering recommendation is given in thefo l-
lowing situations:
R both right wheels or bo thleT wheels are on a
we t or slippery road sur face when you brake
R theve hicle starts toskid
Syst
Syst em limits
em limits
ST EER CONTROL may be impaired or may not
function in thefo llowing situations:
R ESP ®
is deactivated. Driving and parking
271
271

Syst
Syst
em limits
em limits
The system limits of Tra1c Sign Assist apply to
th e de tection of tra1c signs (/ page 294).
Speed limits below 20 km/h are not automatical ly
adop tedby the system as the stored speed. Tem-
porary speed restrictions (e.g. for a cer tain time
or due towe ather conditions) cann otbe proper ly
de tected bythe system. The maximum permissi-
ble speed applying toave hicle with a trailer is not
de tected bythe system.
Ad just the speed in these situations. &
W
WARNING
ARNING Risk of accident due toActive
Speed Limit Assist adapt ingtheve hicle's
speed
The speed adop tedby Active Speed Limit
Assist may be too high or incor rect in some
individual cases, such as:
R at speed limits below 20 km/h
R inwe t conditions or in fog
R when towing a trailer #
Ensure that the driven speed complies
with tra1c regulations. #
Adjust the driving speed tosuit cur rent
tra1c and weather conditions. F
F
unction of r
unction of r out
oute-based speed adapt
e-based speed adapt ation
ation
When Active Distance Assist DISTRONIC is activa-
te d, theve hicle speed will be adap ted accordingly
to thero ute events ahead. Depending on the drive
prog ram selected, theve hicle neg otiates a route
ev ent ahead in a fuel-saving, comfor table or
dynamic manner. When thero ute event has been
passed, theve hicle accelerates again tothe
stored speed. The set distance totheve hicle in
front, vehicles de tected ahead and speed restric-
tions ahead are take n into account.
Ro ute-based speed adap tation can be activa ted in
th e multimedia system (/ page 283).
The following route events are take n into account:
R Bends
R Roundabouts
R T-junctions
R Turns and exits R
Tra1c jams ahead (only with Live Tra1c )
Also, the speed is reduced if the turn signal indi-
cator is switched on and one of thefo llowing sit-
uations is de tected:
R Turning o. at junctions
R Driving on slowing-down lanes
R Driving on lanes adjacent toslowing-down
lanes
The driver is responsible forch oosing theright
speed and observing other road users. This
applies in particular tojunctions, roundabouts and
tra1c lights, as route-based speed adap tation
does not brake theve hicle toa standstill.
If a cor responding route event is de tected while
ro ute guidance is active, the /rst speed adjust-
ment is car ried out automaticall y.Ifth e turn signal
indicator is switched on, the selected route is
con/rmed and fur ther speed adjustment is activa-
te d.
Speed adap tation is cancelled in thefo llowing
cases:
R Ifth e turn signal indicator is switched o.
before thero ute event and it is therefore 282 282
Driving and parking

assumed
that thero ute event is not releva nt
to the driver.
R Ifth e driver depresses the accelerator or
brake pedal during the process.
Sy
Sy st
stem limits
em limits
Ro ute-based speed adap tation does not take right
of wa yre gulations into account. The driver is
re sponsible for complying with road tra1c regula-
tions and driving at a suitable speed.
In di1cult conditions, the speed selection made
by the system may not alw ays be suitable. This
applies tothefo llowing situations, forex ample:
R unclear roads
R road nar rowing
R varying maximum permissible speeds in indi-
vidual lanes, forex ample at toll stations
R wetro ad sur faces, snow or ice
R if transport equipment, forex ample a trailer or
bicycle rack , is attached tothe trailer hitch
and the electrical connection has been cor-
re ctly es tablished In
these situations the driver must inter vene
accordingl y. &
W WARNI NG
ARNI NGRisk of accident in spi teof
ro ute-based speed adap tation
Ro ute-based speed adap tation can malfunc-
tion or be temp orarily una vailable in thefo l-
lowing situations:
R Ifth e driver does not follow the calculated
ro ute
R If map data is not up-to-date or available
R Intheev ent of roadwor ks
R In bad weather or road conditions
R Ifth e accelerator pedal is depressed
R Intheev ent of electronically displa yed
speed limi tations #
Adapt the speed tothe tra1c situation. Se
Se
tting A
tting A ctiv
ctive Dist
e Dist ance Assis
ance Assist DIS t DISTR
TRONIC dr
ONIC dr iving
iving
s
sty ty les
les
R
R eq
eq uir
uir ements:
ements:
R Active Distance Assist DISTRONIC is activa-
te d.
Multimedia system: 4 © 5
Settings 5
Assistance
5 Driving 5
Active Distance Assist
Selecting a dr
Selecting a dr iving s
iving stytyle
le #
Select DYNAMIC SELECT based ,Dynamic or
Comfort.
Se
Se tting speed adapt
tting speed adapt ation
ation #
Select For curves etc..
When these functions are active, theve hicle
speed is adjusted depending on thero ute
ev ents ahead.
% When one of thefo llowing systems is active,
th e de tected speed can be manually adopted
as the speed limit:
R Active Distance Assist DISTRONIC
R Variable limi ter Driving and parking
283
283