MERCEDES-BENZ C-CLASS CABRIOLET 2021 Owners Manual

Display messages
Possible causes/consequences and M
MSolutions
!
÷ inoperative See Owner's
Manual *
ABS and ESP ®
are malfunctioning.
Other driving sy stems and driving saf ety sy stems (e.g. BAS) may also be malfunctioning.
The brake sy stem will continue tooperate normally. Braking dis tance may increase in an emergency braking situa‐
tion. &
WARNING Risk of skidding if ABS and ESP ®
are malfunctioning
The wheels may block du ring braking and ESP ®
does not pe rform any vehicle stabilization.
The steerability and braking characteristics are heavily impaired and the braking dis tance may increase. In addi‐
tion, other driving saf ety sy stems are switched off. #
Drive on carefull y. #
Have ABS and ESP ®
ch ecked immediately at a qualified specialist workshop. ÷
currently unavailable See
Owner's Manual *
ESP ®
is temp orarily una vailable.
Other driving sy stems and driving saf ety sy stems (e.g. BAS) may also be malfunctioning. &
WARNING Risk of skidding if ESP is malfunctioning ®
If ESP ®
is malfunctioning, ESP ®
cannot car ryout vehicle stabilisation. In addition, other driving saf ety sy stems
are switched off. #
Drive carefully on a suitable stre tch of road, making slight steering mo vements at a speed abo ve30 km/h. 468
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions #
Ifth e display message does not disappear, consult a qualified specialist workshop immediately. Drive care‐
full y. ÷
inoperative See Owner's
Manual *
ESP ®
is malfunctioning.
Other driving sy stems and driving saf ety sy stems (e.g. BAS) may also be malfunctioning.
The brake sy stem will continue tooperate normally. Braking dis tance may increase in an eme rgency braking situa‐
tion. &
WARNING Risk of skidding if ESP ®
is malfunctioning
If ESP ®
is malfunctioning, ESP ®
cannot car ryout vehicle stabilisation. In addition, other driving saf ety sy stems
are switched off. #
Drive on carefull y. #
Have ESP ®
ch ecked at a qualified specialist workshop. Display messages and
warning/indicator lamps 469

Display messages
Possible causes/consequences and M
MSolutions
T
!
÷ inoperative See Owner's
Manual *
EBD, ABS and ESP ®
are malfunctioning.
Other driving sy stems and driving saf ety sy stems (e.g. BAS) may also be malfunctioning. &
WARNING Risk of skidding if EBD, ABS and ESP ®
are malfunctioning
The wheels may block du ring braking and ESP ®
does not pe rform any vehicle stabilization.
The steerability and braking characteristics are heavily impaired and the braking dis tance may increase. In addi‐
tion, other driving saf ety sy stems are switched off. #
Drive on carefull y. #
Have the brake sy stem checked immediately at a qualified specialist workshop. Active Brake Assist Func-
tions currently limited See
Owner's Manual *
Ve hicles with the Driving Assistance Package: Active Brake Assi stwith cross-traf fic function, Evasi veSteering
Assist or PRE‑SAFE ®
PLUS are temp orarily una vailable or only partially available.
Ve hicles without the Driving Assistance Package: Active Brake Assi stistemp orarily una vailable. #
Drive on.
As soon as the ambient conditions are within the sy stem limits, the sy stem will become available again. #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra ffic conditions and restart
th e engine. 47 0
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
Active Brake Assist Func-
tions limited See Owner's
Manual *F
orvehicles with the Driving Assis tance Package, thefo llowing functions may be temp orarily una vailable or limited:
R Active Brake Assi stwith cross-traf fic function
R Evasi veSteering Assist
R PRE‑SAFE ®
PLUS
Ve hicles without the Driving Assistance Package: Active Brake Assi stistemp orarily una vailable or only partially
av ailable. #
Consult a qualified specialist workshop.
Radar sensors dirty See
Owner's Manual *T
heradar sensor sy stem is malfunctioning. Possible causes:
R Dirt on the sensors
R Heavy rain or snow
R Extended country driving wi thout other traf fic, e.g. in the desert
Driving sy stems and driving saf ety sy stems may be malfunctioning or temp orarily una vailable.
Once the cause of the problem is no longer present, the driving sy stems and driving saf ety sy stems will be available
again.
If th e display message does not disappear: #
Stop theve hicle in accordance with the tra ffic conditions. #
Clean all sensors (/ page 368). #
Restart the engine. Display messages and
warning/indicator lamps 471

Mercedes me connect
Display messages
Possible causes/consequences and M
MSolutions
Mercedes me connect
Services limited See Own-
er's Manual *T
hevehicle functions forfa ult de tection are restricted.
At least one of the main functions of the Mercedes me connect sy stem is malfunctioning. #
Obser vethe no tes on the diagnostics connection (/ page 29). #
Consult a qualified specialist workshop.
G Inoperative *T
he Mercedes-Benz emer gency call sy stem malfunctioning The Mercedes me connect sy stem is also malfunction‐
ing. #
Consult a qualified specialist workshop. Battery
Display messages
Possible causes/consequences and M MSolutions
# 12 V battery See Owner's
Manual *T
he engine is off and thech arge leve l is too lo w. #
Switch off electrical consumers that are not required.
To charge the12 V battery: #
Lea vethe engine running for a few minutes, or drive an extended di stance. 472
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
*I fth e message appears while the engine is running, this indicates an on-board elect rical sy stem malfunction. #
Consult a qualified specialist workshop.
# See Owner's Manual *T
he12 V battery is not being charge d.
* NO
TEPossible engine damage if you continue driving #
Do not continue driving under any circum stances. #
Consult a qualified specialist workshop. #
Stop theve hicle immediately in accordance with the traf fic conditions and switch off the engine. #
Consult a qualified specialist workshop.
# Stop vehicle See Owner's
Manual *T
he12 V battery is no longer being charge d and thech arge leve l is too lo w.
* NO
TEPossible engine damage if you continue driving #
Do not continue driving under any circum stances. #
Consult a qualified specialist workshop. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Switch off the engine. #
Consult a qualified specialist workshop. Display messages and
warning/indicator lamps 473

Display messages
Possible causes/consequences and M
MSolutions
# Stop vehicle Leave engine
running *T
he12 V battery charge leve l is too lo w. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Lea vethe engine running. #
Ifth e display message disappears: drive on. #
Ifth e display message does not disappear: consult a qualified specialist workshop.
Û 48 V battery See Owner's
Manual *T
he 48 V on-board electrical sy stem has function restrictions. Comfort functions may be restricted. #
Consult a qualified specialist workshop immediatel y.
Ý
Please wait 48 V battery
charging *T
he 48 V battery is dischar ged. You ha veswitched on the ignition while the12 V battery was being charge d with a
suitable charge r or while ano ther vehicle was pr oviding starting assis tance.
The discha rged 48 V battery is charge d automatically via thevo ltage con verter. Af ter a few minutes, theMotor can
be started again display message will be shown on the multifunction displa y. #
Start theve hicle. #
Drive theve hicle for a while tocharge the12 V battery and the 48 V battery af ter disconnecting thech arger
from theve hicle.
If th eMotor can be started again display message does not appear af ter a few minutes: 474
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions #
Tryto start theve hicle. #
Ifth eve hicle does not start, consult a qualified specialist workshop.
Cannot start engine See
Owner's Manual *T
hestate of charge ofthe 48 V battery is too lo w.You can no lon gerst art theve hicle. #
Switch off electrical consumers that are not required. #
Connect a suitable charge r appro vedfo r Mercedes-Benz with suf ficient charge output tothe jump-s tart connec‐
tion point of the12 V battery (/ page 384).
The 48 V battery is charge d via thevo ltage con verter in theve hicle.
Motor can be started again *T
he 48 V battery has been charge d automatically via thevo ltage con verter. #
Start theve hicle and drive for a while tocharge the12 V battery and the 48 V batter y. Ty
re pressure moni tor Display messages
Possible causes/consequences and M MSolutions
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 recei ved. The tyre pressure monitoring sy stem is temp orarily una vailable.
The tyre pressure monitoring sy stem will restart automatically as soon as the cause has been rectified. #
Drive on.
Tyre press. monitor inoper-
ative *T
he tyre pressure monitoring sy stem is malfunctioning. Display messages and
warning/indicator lamps 475

Display messages
Possible causes/consequences and M
MSolutions &
WARNING Thereis a risk of an accident if the tyre pressure monitoring sy stem is malfunctioning
The tyre pressure monitoring sy stem cann otissue a warning if there is pressure loss in one or more of the
tyres.
Ty res with insuf ficient tyre pressure may impair the driving characteristics as well as steering and braking. #
Have the tyre pressure monitoring sy stem checked at a qualified specialist workshop. Tyre press. monitor inoper-
ative No wheel sensors
*T
he wheels fitted do not ha vesuitable tyre pressure sensors. The tyre pressure monitoring sy stem 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. Nopressure value is displa yedfo rthe
af fected tyre. #
Have thefa ulty tyre pressure sensor replaced at a qualified specialist workshop.
h Check tyre(s) *T
he tyre pressure in one or more tyres has dropped significantl y.
The wheel position is displa yed. A warning tone also sounds. &
WARNING Risk of an accident due toinsuf ficient tyre pressure
R The tyres can bu rst.
R The tyres can wearexc essively and/or une venly. 476
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
R The driving characteristics as well as thesteering 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 tra ffic conditions. #
Check the tyre pressure (/ page 396) andthe tyres.
h
Rectify tyre pressure *T
he tyre pressure is too low in at least one of the tyres, or the dif fere nce in tyre pressure between the individual
wheels is too great. #
Check the tyre pressure and add air, if necessar y. #
When the tyre pressure is cor rect, restart the tyre pressure monitoring sy stem (/ page 399).
h Warning tyre defect *T
he tyre pressure in one or more tyres has dropped suddenly. The wheel position will be displa yed. &
WARNING Risk of an accident from driving wi thaflat tyre
R The tyres can overheat and be damaged.
R The driving characteristics as well as thesteering and braking characteristics may be great lyimpaired.
Yo u could then lose control of theve hicle. #
Do not drive with a flat tyre. Display messages and
warning/indicator lamps 477