2021 MERCEDES-BENZ S-CLASS SALOON LONG trailer

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es Possible causes/conseq
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&
Pre-entry climate control
via key inoperative High-
voltage battery low *T
hecharge ofthe high-voltage battery is too lo w.Pre-entry climate control cannot be switched on. #
Char gethe high-voltage batter y.
When the high-voltage battery is su1ciently charge d, pre-ent ryclimate cont rol will be operational again. Hybr Hybr
id syst
id syst em
em Displa
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es Possible causes/conseq
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uences andM
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u
Towing not permitted See
Owner's Manual *T
he drive system is malfunctioning. #
Have theve hicle transpo rted only using a transpor ter or trailer (/ page 451).508 508
Display messages and
warning/indicator lamps

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If th e driver's display fails, you may not recognise function restrictions a.ec ting systems releva nt tosaf ety or the
speed displa y,forex ample. The operating saf ety of theve hicle may be impaired (/ page 382). #
Have theve hicle checkedby aqu ali/ed specialist workshop immediatel y.
d
Vehicle is operational
Switch off vehicle before
exiting *Y
ou are leaving theve hicle in a ready-to-drive state. #
Get out of theve hicle, secure it against rolling away and take theke y with you. #
Ifyo u do not lea vetheve hicle, switch o. the electrical consumers, e.g. the seat heating. Otherwise, the 12‑V bat-
te ry may dischar geand starting the engine may be possible only with the help of a second battery (jump start).
ï
Operation only possible in
transmission position P *T
he ball neck will not swivel because transmission position h,kor neutral iis selected. #
Depress the brake pedal. #
Engage park position j.
ï Trailer coupling in motion *T
he ball neck is retracting/extending.
Do not attem pttospeed up, slow down or initiate the swivel mo vement using your hand, foot or other aids. During the
swivel mo vement, do not couple a trailer.
When the ball neck has reached an operational position, the display message will disappear. 516 516
Display messages and
warning/indicator lamps

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ï
Check trailer hitch
lock (white display message) *T
he trailer hitch is not operational during a jou rney with a trailer. &
W WARNING
ARNING Risk of an accident if the ball neck is not loc ked
The trailer may become de tach ed. #
Stop theve hicle immediately in accordance with the tra1c conditions. Do not continue driving. #
Uncouple the trailer and secure it against rolling away. #
Initiate a new swivelling procedu reand do not re-couple the trailer until the display message disappears. #
Initiate a new swivel mo vement (/ page 337). #
When the display message disappears, couple up the trailer and drive on.
If th e display message does not disappear, the trailer hitch is malfunctioning and the ball neck is not loc ked. #
Do not couple up the trailer. Drive on without the trailer. No tethere duced ground clearance due tothe unloc ked
ball nec k. #
Consult a quali/ed specialist workshop.
*W hen theve hicle is stationary with a coupled trailer, the trailer hitch is not operational. #
Uncouple the coupled trailer and secure it against rolling away. #
If t
If the ball nec
he ball nec k has been re
k has been retr
tract
act ed:
ed: initiate a new swi vel mo vement (/ page 337).
The ball neck will engage vertically in the loc ked position and then engage beneath the bumper. Display messages and
warning/indicator lamps
517
517

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If t
If the ball nec
he ball nec k has been e
k has been e xt
xtended:
ended: initiate a new swivel mo vement (/ page 337).
The ball neck will engage beneath the bumper.
If th e display message does not disappear, the trailer hitch is malfunctioning and the ball neck is not loc ked. #
Do not couple up the trailer. Drive on without the trailer. No tethere duced ground clearance due tothe unloc ked
ball nec k. #
Consult a quali/ed specialist workshop.
Please teach in trailer cou-
pling again using the but-
ton in load compartment
Wait for it to extend/
retract *T
he swivel mo vement of the trailer hitch is impaired. #
Use the button on the boot lid totrigger a ne w,comple teswivel mo vement until the ball neck engages beneath the
bumper.
Head-up display currently
unavailable See Owner's
Manual *T
he head-up displ ayistemp orarily una vailable. Possible causes:
R malfunctions in the po wer supply
R signal inter fere nce #
Stop in accordance with the tra1c conditions and switch theve hicle o. and on again. #
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. 518 518
Displ
aymessages and warning/indicator lamps

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ð
¸
Ø
Restricted during trailer
operation *W
hen the trailer soc ket is occupied, some driving systems will be available only toa limi tedex tent. #
Drive care fully ifyou are towing a trailer or ha vethe bicycle rack mounted.
Driver camera view cur-
rently restricted See Own-
er's Manual *T
he view of the driver camera is reduced. Possible causes:
R Objects or stic kers are projecting into the driver camer a’s /eld of vision.
R The driver camera is dirty. #
Keep the driver camera's /eld of vision free. #
Clean the driver camera if necessar y.Please comply with the no tes on caring forth e interior relating tothe display
(/ page 434). 548 548
Display messages and
warning/indicator lamps

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es Possible causes/conseq
ossible causes/consequences and uences andM
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Solutions
Limited availability of
Active Parking Assist
manoeuvring assistant See
Owner's Manual *A
ctive Parking Assist ’smanoeuv ring assistant is temp orarily una vailable or only partially available. #
Clean all senso rsof the parking and camera system (/ page 433). #
Ifth e display message still appears, consult a quali/ed specialist workshop.
PARKTRONIC and manoeu-
vring assistant not availa-
ble at rear when towing a
trailer *W
hen you establish the electrical connection tothe trailer, there ar Parking Assist PARKTRONIC and manoeuvring
assistant will be una vailable. #
Press the leT-hand Touch Control and ackno wledge the display message.
PARKTRONIC inoperative
See Owner's Manual *P
arking Assist PARKTRONIC is malfunctioning.
Once the cause of the problem is no longer present, the system will be available again. #
Continue driving while paying attention totheve hicle's sur roundings.
or #
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.
Active Parking Assist and
PARKTRONIC inoperative
See Owner's Manual *A
ctive Parking Assist and Parking Assist PARKTRONIC are malfunctioning.
Once the cause of the problem is no longer present, the system will be available again. #
Continue driving while paying attention totheve hicle's sur roundings.
or #
Stop theve hicle in accordance with the tra1c conditions and restart theve hicle. Displ
aymessages and warning/indicator lamps
553 553

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 lamps 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.
Dr
Dr iv
iver's display
er's display Dr
Dr
iv
iver's displa
er's displa y wit
y with dr
h driv
iver camera
er camera Indicat
Indicat
or and w
or and w ar
arning lam
ning lam ps:
ps:
6 Restraint system (/ page 573)
ü Seat belt (/ page 573)
_ Reduced po wer (/ page 574)
Ú System error (/ page 574)
# Electricalfault (/ page 574)
ï Trailer hitch (/ page 575)
Ù Powe r steering (yellow) (/ page 575)
Ù Power steering (red) (/ page 575)
Ù Rear axle steering (yellow)
(/ page 575) Ù
Rear axle steering (red)
(/ page 575)
ÿ Coolanttemp erature (/ page 578)
; Engine diagnostics (/ page 578)
p V
Vehicles wit
ehicles wit h a pe
h a petr
trol engine:
ol engine: engine
operating temp erature (/ page 578)
% V
Vehicles wit
ehicles wit h a diesel engine:
h a diesel engine: preglow
# Electricalfault (/ page 578)
8 Reser vefuel wi thfuel /ller 0ap loca-
tion indicator (/ page 578)
! Electric parking brake (red)
(/page 581)
! Electric parking brake (yellow)
(/page 581)
J Brakes (yellow) (/ page 581)
J Brakes (red) (/ page 581)
L Distancewarning (/ page 584)
Ó Active Brake Assist (/ page 584)
ê Active Brake Assist (/ page 584)
Æ Active Brake Assist (/ page 584) Display messages and
warning/indicator lamps
571 571

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W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
Ú
System er rorwa rning lamp *T
he red system er rorwa rning lamp is lit while theve hicle is in a state of operational readiness õ.
There is a malfunction in the drive system. #
Notethe messages on the driver's displa y.
#
Electrical fault warning lamp *T
hered electrical fault warning lamp is lit.
There is a fault with the electrics. #
Notethe messages on the driver's 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
ï
Tr ailer tow hitch warning
lamp *T
hered trailer hitch warning lamp is lit.
The trailer hitch is not operational or is swivelling. &
W
WARNING
ARNING Risk of an accident if the ball neck is not loc ked
The trailer may become de tach ed. #
Stop theve hicle immediately in accordance with the tra1c conditions. Do not continue driving. #
Uncouple the trailer and secure it against rolling away. Display messages and
warning/indicator lamps
575
575