2021 MERCEDES-BENZ CLA COUPE trailer

V
V
ehicle
ehicle Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/conseq uences and
uences andM
MSolutions
Solutions
d
Vehicle is operational
Switch off ignition 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
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 265). #
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. 422
422
Display messages and
warning/indicator lamps

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions #
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 f
k has been f olded in:
olded in:unlockthe ball neck (/ page 265). #
Swivel the ball neck into the end position manually and let it engage. #
If t
If the ball nec
he ball nec k has been f
k has been f olded out
olded out::unlock the ball neck (/ page 265). #
Swivel the ball neck beneath the bumper manually and let it engage.
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.
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. Displ
aymessages and warning/indicator lamps
423 423

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra1c conditions and restart
th eve hicle.
Blind Spot Assist inopera-
tive *B
lind Spot Assist is malfunctioning. #
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.
Blind Spot Assist not availa-
ble when towing a trailer
See Owner's Manual *W
hen you establish the electrical connection tothe trailer, Blind Spot Assist will be una vailable. #
Press the leT-hand Touch Control and ackno wledge the display message.
Active Blind Spot Assist
currently unavailable See
Owner's Manual *A
ctive Blind Spot Assist is temp orarily una vailable.
The system limits ha vebeen reached (/ page 243).
Once the cause of the problem is no longer present, the system will be available again. #
Drive on
or #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra1c conditions and restart
th eve hicle.
Active Blind Spot Assist
inoperative *A
ctive Blind Spot Assist is malfunctioning. Display messages and
warning/indicator lamps
447
447

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions #
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 Blind Spot Assist
not available when towing
a trailer See Owner's Man-
ual *W
hen you establish the electrical connection tothe trailer, Active Blind Spot Assist will be una vailable. #
Press the leT-hand Touch Control and ackno wledge the display message.
Active Lane Keeping Assist
currently unavailable See
Owner's Manual *A
ctive Lane Keeping Assist is temp orarily una vailable.
The ambient conditions are outside the system limits (/ page 246).
As soon as the ambient conditions are within the system limits, the system will become available again. #
Drive on
Active Lane Keeping Assist
inoperative *A
ctive Lane Keeping Assist is malfunctioning. #
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. 448 448
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 470)
ü Seat belt (/ page 470)
_ Reduced po wer (/ page 472)
Ú System error (/ page 472)
# Electricalfault (/ page 472)
ï Trailer hitch (/ page 473)
Ù Powe r steering (/ page 473) ÿ
V
V ehicles wit
ehicles wit h a widescr
h a widescr een coc
een cockpit
kpit:
:
coolant temp erature (/ page 474)
; Engine diagnostics (/ page 474)
% V
Vehicles wit
ehicles wit h a diesel engine:
h a diesel engine: preglow
# Electricalfault (/ page 474)
æ Reser vefuel wi thfuel /ller 0ap loca-
tion indicator (/ page 474)
! Electric parking brake (red)
(/page 478)
! Electric parking brake (yellow)
(/page 478)
J Brakes (yellow) (/ page 478)
J Brakes (red) (/ page 478)
L Distancewarning (/ page 480)
Ó Active Brake Assist (/ page 480)
ê Active Brake Assist (/ page 480)
! ABS (/page 481)
÷ ESP®
(/ page 481)
å ESP®
OFF (/ page 481) Display messages and
warning/indicator lamps
469 469

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. &
W
W ARNING
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. #
Notethe messages on the instrument displa y.Engine
Engine
W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
Solutions
ÿ
Coolant warning lamp (red) *T
he red coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The coolant le vel is too low
R The air supply tothera diator is obstructed
R The radiator fan is faulty 474
474
Display message
s andwarning/indicator lamps

Displa
Displa
y messag
y messag es
es
ç - - - km/h..................................... 442
È - - - km/h..................................... 442
h - - - km/h..................................... 441
# 12 V battery See Owner's Man-
ual......................................................... 457
ò Acoustic presence indicator
inoperative............................................ .416
: Active Light System inoperative..... 410
¯ AdBlue system fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km.................................................. 466
¯ AdBlue system fault Emer gency
op. in XXX miles See Owner's Manual.... 465
¯ AdBlue system fault Engine
start not possible................................... 466
¯ AdBlue system fault See Own-
er's Manual............................................ 465
5 Add 1 litre engine oil when next
re fuelling ............................................... 467 é
ATTENTION ASSIST inoperati ve..... 441
é ATTENTION ASSIS T:Take a
break!.................................................... 441
: Automatic driving lights inoper-
ative...................................................... 410
Û Battery overheated Stop, every-
body out! Outdoors if possible ................ 418
û Before starting the engine, turn
th e steering wheel.................................. 425
J Brake immediately ........................ 439
Á Change key batteries .................... 407
è Charger cable connected .............. 416
J Check brake 0uid le vel.................. 440
ï Check trailer hitch lock (white
display message) .................................... 422
h Check tyre(s) ................................ 460
! Clean the fuel /lter....................... 430
ÿ Coolant Stop vehicle Switch
engine o............................................... 429 !
currently una vailable See Own-
er's Manual............................................4 52
÷ currently una vailable See Own-
er's Manual............................................4 53
5 Engine oil le vel cannot be meas-
ured....................................................... 468
5 Engine oil le velRe duce oil le vel..... 467
5 Engine oil le velSt op vehicle
Switch engine o.................................... 467
5 Engine oil pressure Stop Switch
o. engine.............................................. 468
ä Fault Drive at max. 80 km/h ......... 451
6 Front leT malfunction Consult
wo rkshop (e xample)...............................4 04
& inoperative Battery low................. 413
& inoperative Char geHV battery...... 414
& inoperati veHigh-voltage battery
ch arging inco mplete ............................... 414
& inoperative Refuel vehicle............. .414
& inoperative See Owner's Man........ 413 Index
493 493

¸
temp orarily una vailable Sensors
dirty....................................................... 449
Ú Top up AdBlue Emer gency op. in
XXX miles See Owner's Manual.............. 464
+ Top up coolant See Owner ’s
Manual.................................................. 428
¥ Top up washer 0uid...................... .427
u Towing not permitted See Own-
er's Manual ............................................ 416
d Trans. oil overheated Drive on
with care................................................ 433
! Turn on the ignition torelease
th e parking brake ................................... 439
Ú .................................................... 464
d Vehicle is operational Switch o.
ignition before exiting............................. 422
h Warning tyre defect....................... 461
h Wheel sensor(s) missing ................ 460Ú
XX,X l Top up AdBlue Swit chon
ignition, wait 60 sec. or eng. start not
poss...................................................... 465
"Electric" drive prog ram cur rently
una vailable............................................. 418
Ac tive Blind Spot Assist cur rently
una vailable See Owner's Manual ............ 447
Ac tive Blind Spot Assist inoperative........ 447
Ac tive Blind Spot Assist not available
when towing a trailer See Owner's
Manual................................................. .448
Ac tive bonnet malfunction See Own-
er's Manual............................................ 425
Ac tive Brake Assist Functions cur-
re ntly limi ted See Owner's Manual .........455
Ac tive Brake Assist Functions limi ted
See Owner's Manual.............................. 456
Ac tive Distance Assist available again ..... 444
Ac tive Distance Assist cur rently
una vailable See Owner's Manual ............ 443Ac
tive Distance Assist inoperative.......... 443
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual ............ 448
Ac tive Lane Keeping Assist inoperative... 448
Ac tive Steering Assist cur rently
una vailable due tomultiple emer-
ge ncy stops........................................... 445
Ac tive Steering Assist cur rently
una vailable See Owner's Manual ............ 445
Ac tive Steering Assist inoperative...........4 45
Ad aptive Highbeam Assist cur rently
una vailable See Owner's Manual ............ 411
Ad aptive Highbeam Assist inoperative ....4 12
Ad aptive Highbeam Assist Plus cur-
re ntly una vailable See Owner's Manual ... 412
Ad aptive Highbeam Assist Plus inop-
erative.................................................. .412
Anti-theT alarm system Malfunction ....... 427
Apply brake todeselect Park (P) posi-
tion....................................................... .431 Index
495 495