sensor MERCEDES-BENZ GLC SUV 2021 Service Manual

Lights
Display messages
Possible causes/consequences and M MSolutions
: Left dipped beam (examp le) *T
he cor responding light source is defective. #
Drive on carefully. #
Consult a qualified specialist workshop immediatel y.
% LED light sources: the display message forth e cor responding light appears only when allthe light-emitting
diodes in the light are faulty.
: Malfunction See Owner's
Manual *T
heexterior lighting is malfunctioning. #
Consult a qualified specialist workshop.
* Ve hicles with a trailer hitch: a fuse may haveblown. #
Stop theve hicle in accordance with the tra ffic conditions. #
Check the fuses and replace them if necessary (/ page 331).
:
Automatic driving lights
inoperative *T
he light sensor for auto matic driving lights is malfunctioning. #
Consult a qualified specialist workshop. 376
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M MSolutions #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra ffic conditions and restart
th e engine. #
If necessar y,clean there ar bumper. If the bumper is especially dirty, the sensors in the bumper may be mal‐
functioning.
Blind Spot Assist inopera-
tive *B
lind Spot Assist is malfunctioning. #
Consult a qualified specialist workshop.
Blind Spot Assist not availa-
ble when towing a trailer
See Owner's Manual *W
hen you es tablish the electrical connection tothe trailer, Blind Spot Assist will be una vailable. #
Press the left-hand Touch Control and ackn owledge the display message.
Active Blind Spot Assist
currently unavailable See
Owner's Manual *A
ctive Blind Spot Assi stistemp orarily una vailable.
The sy stem limits ha vebeen reached (/ page213).
On ce the cause of the problem is no longer present, the sy stem will be available again. #
Drive on.
or #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra ffic conditions and restart
th e engine.
Active Blind Spot Assist
inoperative *A
ctive Blind Spot Assi stis malfunctioning. #
Consult a qualified specialist workshop. 402
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M MSolutions
Á Vehicle rising Please wait *T
hevehicle le vel is too lo w.The vehicle will be raised tothe selected vehicle le vel. #
Wait until the display message disappears before pulling away.
Á Please reduce speed *Y
ou are driving toofast forth e selected vehicle le vel. #
Toadjust theve hicle le vel,yo u must not drive at speeds greaterth an 80 km/h. #
Toadjust theve hicle le vel during trailer operation, you must not drive at speeds greaterth an 30 km/h.
Parking Assist Manoeu-
vring assistance limited
See Owner's Manual *T
heParking Assist manoeuvring assis tant is temp orarily una vailable or only partially available. #
Clean all sensors of the parking and camera sy stem (/ page 309). #
Ifth e display message still appears, consult a qualified specialist workshop.
Parking Assist and
PARKTRONIC inoperative
See Owner's Manual *
Ve hicles with Active Parking Assis t:Ac tive Parking Assist and Parking Assist PARKTRONIC are malfunctioning.
Ve hicles without Active Parking Assis t:Pa rking Assist PARKTRONIC is malfunctioning. #
Stop theve hicle in accordance with the tra ffic conditions and restart the engine. #
Ifth e display message still appears, consult a qualified specialist workshop. 406
Display messages 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 309). #
Restart the engine. Display messages and
warning/indicator lamps 411

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 325).
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 415

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 burs t.
R The tyres can wearexc essively and/or une venly. 416
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M MSolutions
5 Engine oil pressure Stop
Switch off engine *D
isplay message only for cer tain engines:
The oil pressure is too lo w.
* NO
TEEngine damage causedbydriving with insuf ficient oil pressure #
Avoid driving with insuf ficient oil pressure. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Switch off the engine. #
Consult a qualified specialist workshop.
5 Engine oil level cannot be
measured *T
he electrical connection tothe oil le vel sensor has been inter rupte d or the oil le vel sensor is faulty. #
Consult a qualified specialist workshop. Wa
rning and indicator lamps Overview of indicator and
warning lamps Some sy
stems will per form a self-test when the
ignition is switched on. Some indicator and wa
rning lamps may briefly light up or flash. This
behaviour is non-critical. These indicator and
wa rning lamps indicate a malfunction only if they
light up or flash af terth e engine has been star‐
te d or during a journe y. Displ
aymessa ges and warning/indicator lamps 425

Engine
Wa
rning/indicator lamp
Possible causes/consequences and M MSolutions
ÿ Coolant warning lamp *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
R The coolant pump is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120°C. &
WARNING Risk of burn s when opening the bonn et
If yo u open the bonn etwhen the engine has overheated or when there is a fire inthe engine compartment, the
fo llowing situations may occur:
R You could come into contact with hot gases.
R You could come into contact with other hot, escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the bonn etclosed and call thefire service. 430
Display messages and warning/indicator lamps

6
Restra int sys. malfunction Con‐
sult workshop........................................ 371
# See Owner's Manual..................... 413
Ù Steering malfunction Incre ased
ph ysical ef fort See Owner's Manual...... 383
Ù Steering malfunction Stop
immediately See Owner's Manual ......... 383
# Stop vehicle Lea veengine run‐
ning ........................................................ 414
# Stop vehicle See Owner's Man‐
ual..........................................................4 13
Á Stop vehicle Vehicle too low......... 404
ç suspended...................................3 98
: Switch off lights ........................... 377
: Switch on headlamps................... 377
Ø Top up AdBlue Emergency op.
in XXX miles See Owner's Manual......... 420
+ Top up coolant See Owner ’s
Manual.................................................. 386
¥ Top up washer fluid ...................... 385 ï
Trailer coupling in motion .............381
! Turn on the ignition torelease
th e parking brake..................................3 95
d Vehicle is operational Switch
off ignition before exiting....................... 381
Á Vehicle rising Please wait............ .406
Á Vehicle rising................................4 05
h Warning tyre defect..................... .417
h Wheel sensor(s) missing ...............416
Ø XX,X l Top up AdBlue Switch on
ignition, wait 60 sec. or eng. start
not poss................................................ .421
Ac tive Blind Spot Assi stcur rently
una vailable See Owner's Manual ...........402
Ac tive Blind Spot Assi stinope rative ...... 402
Ac tive Blind Spot Assi stnot available
when towing a trailer See Owner's
Manual .................................................. 403
Ac tive bonnet malfunction See Own‐
er's Manual........................................... 384 Ac
tive Brake Assi stFunctions cur‐
re ntly limited See Owner's Manual ........41 0
Ac tive Brake Assi stFunctions limited
See Owner's Manual.............................. 411
Ac tive Dis tance Assi stavailable again ...3 99
Ac tive Dis tance Assi stcur rently
una vailable See Owner's Manual ...........398
Ac tive Dis tance Assi stinope rative ........ 398
Ac tive Lane Keeping Assist Camera
view restricted See Owner's Manual..... 403
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual ...........403
Ac tive Lane Keeping Assist inopera‐
tive........................................................ 403
Ac tive Steering Assist cur rently
una vailable due tomultiple emer‐
ge ncy stops...........................................4 00
Ac tive Steering Assist cur rently
una vailable See Owner's Manual ...........399
Ac tive Steering Assist inoperative ......... 399 Index
449

Ad
aptive Highbeam Assist Camera
view restricted See Owner's Manual..... 378
Ad aptive Highbeam Assist cur rently
una vailable See Owner's Manual ...........378
Ad aptive Highbeam Assist inoperative.. .378
Ad aptive Highbeam Assist Plus Cam‐
era view restricted See Owner's
Manual.................................................. 379
Ad aptive Highbeam Assist Plus cur‐
re ntly una vailable See Owner's Man‐
ual......................................................... 379
Ad aptive Highbeam Assist Plus inop‐
erative.................................................. .379
Apply brake todeselect Park (P)
position................................................. 389
Apply brake toselect R......................... 389
Au xilia rybattery malfunction (red
display message) ...................................3 91
Au xilia rybattery malfunction (white
display message) ...................................3 91Beginning eme
rgency stop.................... 400
Blind Spot Assist cur rently una vaila‐
ble See Owner's Manual ........................ 401
Blind Spot Assist inope rative ................. 402
Blind Spot Assi stnot available when
to wing a trailer See Owner's Manual .....402
Cannot start engine See Owner's
Manual................................................... 41 5
Check tyre pressures then restart
Ru n Flat Indicator................................... 419
Cruise contro l and Limiter inope rative.. 397
Cruise control inope rative..................... 397
Cruise control off.................................. 397
Fr ont-passenger airbag disabled See
Owner's Manual....................................3 72
Fr ont-passenger airbag enabled See
Owner's Manual....................................3 72
Haza rdwa rning lamps malfunctioning...3 80
Limi ter inoperative................................ 397
Limiter passive...................................... 397 Mercedes me connect Services limi‐
te
d See Owner's Manual........................4 12
Mo tor can be star ted again.................... 41 5
N permanently active Risk of vehicle
ro lling .................................................... 389
Only select Park (P) when vehicle is
st ationary.............................................. 388
Pa rking Assist and PARKTRONIC
inoperative See Owner's Manual ...........406
Pa rking Assist Manoeuvring assis‐
ta nce limited See Owner's Manual........ 406
Place theke y in the mar ked space
See Owner's Manual..............................3 75
PRE-SAFE inoperative See Owner's
Manual.................................................. 373
Ra dar sensors dirty See Owner's
Manual................................................... 411
Re duce speed ........................................ 41 8
Re versing not poss. Consult work‐
shop......................................................3 90450
Index