sensor MERCEDES-BENZ GLS SUV 2019 Service Manual

Display messages
Possible causes/consequences and M
MSolutions
ç
ê
¸
æ Currently unavailable
Radar sensors dirty *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, driving sy stems and driving saf ety sy stems will be available
again.
If th e display message does not disappear: #
Pull over and stop theve hicle in accordance with the tra ffic conditions. #
Clean all sensors (/ page545). #
Restart the engine. 632
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions #
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. Exhaust
gas af tertre atment Display messages
Possible causes/consequences and M MSolutions
Ø Refill AdBlue See Owner’s
Manual *
The AdBlue ®
leve l has fallen below there ser verange. #
Top up AdBlue ®
immediately (/ page 216). 644
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions &
WARNING Risk of an accident due toinsuf ficient tyre pressure
Ty res with insuf ficient tyre pressure pose thefo llowing risks:
R The tyres may bur st, especially as the load and vehicle speed increase.
R The tyres may wearexc essively and/or une venly, which may greatly impair tyre traction.
R ‑ The driving characteristics, steering 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, paying attention toroad and traf fic conditions. #
Check the tyre pressure (/ page571) and the tyres. #
When the tyre pressure is cor rect, restart the tyre pressure loss warning sy stem (/ page578).
h
Tyre press. mo nitor 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
re cei ved. The tyre pressure monitoring sy stem is temp orarily una vailable. #
Drive on.
The tyre pressure monitoring sy stem restarts automatically as soon as the cause has been rectified. 650
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
h Tyre press. monitor inoper-
ative *T
he tyre pressure monitoring sy stem is faulty. &
WARNING Thereis a risk of an accident if the tyre pressure monitoring sy stem is malfunctioning
If th e tyre pressure monitoring sy stem is malfunctioning, it is not able toissue a warning if there is pressure
loss in one or more of the tyres.
Ty res with insuf ficient tyre pressure ma y,forex ample, af fect theve hicle's handling characteristics, steering and
braking. ‑ #
Have the tyre pressure monitoring sy stem checked at a qualified specialist workshop. #
Consult a qualified specialist workshop.
Check tyre pressures then
restart Run Flat Indicator *T
he tyre pressure loss warning sy stem generated a displ aymessa geand has not been restar ted since. #
When the tyre pressure is cor rect, restart the tyre pressure loss warning sy stem (/ page578).
h
Tyre press. mo nitor 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. Display messages and
warning/indicator lamps 651

Display messages
Possible causes/consequences and M
MSolutions
h Wheel sensor(s) missing *T
he tyre pressure sensor signal is missing from one or more tyre(s). The pressure of the af fected tyre is not dis‐
pl ay ed. #
Have thefa ulty tyre pressure sensor replaced at a qualified specialist workshop.
Run Flat Indicator inopera-
tive *T
he tyre pressure loss warning sy stem is malfunctioning. #
Consult 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. &
WARNING Risk of an accident due toinsuf ficient tyre pressure
Ty res with insuf ficient tyre pressure pose thefo llowing risks:
R The tyres may bur st, especially as the load and vehicle speed increase.
R The tyres may wearexc essively and/or une venly, which may greatly impair tyre traction.
R ‑ The driving characteristics, steering 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, paying attention toroad and traf fic conditions. #
Check the tyre pressure (/ page571) and the tyres. 652
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
b Automatic driving lights
inoperative *T
he light sensor is faulty. #
Consult a qualified specialist workshop.
b Switch on headlamps *Y
ou are driving without lo w-beam headlamps. #
Turn the light switch totheL orà position.
b
Switch off lights *Y
ou are leaving theve hicle and the lights are still switched on. #
Turn the light switch totheà position.
b Hazard warning lamps mal-
functioning *T
he hazard warning lamp switch is faulty. #
Consult a qualified specialist workshop. Display messages and
warning/indicator lamps 663

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
? Coolant warning lamp The
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
If th ere is an additional warning tone, the coolant temp erature has exceeded 120 °C. &
WARNING Danger of bu rns when opening the bonn et
If yo u open the engine bonn etwhen the engine has overheated or during a fire inthe engine compartment, you
could come into contact wi thhot gases or other escaping operating fluids. #
Before opening the bonn et, allow the engine tocool down. #
Intheeve nt of a fire inthe engine compartment, keep the engine bonn etclosed and call thefire service. #
Stop theve hicle immediately, paying attention toroad and traf fic conditions, and switch off the engine. Do not con‐
tinue driving under any circums tances. #
Obser vethe messages on the multifunction displa y.
If th e coolant temp erature display is at the lo wer end of thete mp erature scale: #
Consult a qualified specialist workshop. 674
Displaymessa ges and warning/indicator lamps

¯Ad
Blue system fault Perf.
re duced in XXX miles See Owner's
Manual ................................................ 646
¯ AdBlue sy stem fault Perf.
re duced: XXX km/h Nostart in XXX
km ...................................................... .646
¯ AdBlue sy stem fault See Own‐
er's Manual ........................................ .646
4Ad d 1 litre engine oil when next
re fuelling ............................................. 642
Anti-theft alarm sy stem Malfunction ... 660
Apply brake todeselect Park (P)
position ...............................................6 47
App lybrake toselect R ........................ 648
À ATTENTION ASSIST inoperative ... 625
ÀAT TENTION ASSIS T:Take a
break! .................................................. 625
bAu tomatic driving lights inoper‐
ative .................................................... 663
Au xilia rybattery malfunction ..............649Beginning eme
rgency stop .................. 628
Blind Spot Assist cur rently una vaila‐
ble See Owner's Manual ...................... 630
Blind Spot Assist inope rative ............... 630
Blind Spot Assi stnot available when
to wing a trailer See Owner's Manual ...6 30
Cannot start engine See Owner's
Manual ................................................ 639
ÁChan gekey bat teries .................. 655
JCheck brake fluid le vel................ .619
Check brake pads See Owner's Man‐
ual ........................................................ 61 9
ï Check trailer hit chlock (white
display message) ................................ .657
Check tyre pressures then restart
Ru n Flat Indicator ................................ 651
hCheck tyre(s) ............................... 652
!Clean the fuel filter ...................... 640
Á Compressor is cooling ................ 629?Coolant
Stop vehicle Switch
engine off ............................................ 637
Cruise contro l and Limiter inope ra‐
tive ...................................................... 635
Cruise control inope rative ................... 635
Cruise control off ................................ 635
_Cur rently una vailable Camera
view restricted ..................................... 633
çCu rrently unavailable Radar
sensors dirty .......................................6 32
!cur rently una vailable See Own‐
er's Manual .......................................... 612
÷ currently una vailable See Own‐
er's Manual .......................................... 61 3
Drive sy stem Malfunction Stop
Switch engine off ................................. 641
Drive sy stem Malfunction Visit work‐
shop ..................................................... 641
5 Engine oil le vel cannot be
measured ............................................ 644690
Index

PRE-SAFE impulse side inoperative
See Owner's Manual ............................624
PRE-SAFE inoperative See Owner's
Manual ................................................ 624
hRe ctify tyre pressure ................... 653
Re duce speed ...................................... 654
ØRe fill Ad Blue Engine start not
possible .............................................. .645
ØRe fill Ad Blue See Owne r’s Man‐
ual .......................................................6 44
! Release parking brake .................616
¸ Replace air cleaner ......................641
À Replace key See Owner's Man‐
ual ...................................................... .654
Á Replace key ................................ .655
8Re servefuel le vel........................ 640
6 Restra int sys. malfunction Con‐
sult workshop ...................................... 620
Re versing not poss. Consult work‐
shop ....................................................6 48Risk of
vehicle rolling away Apply
pa rking brake See Owner's Manual .....6 49
Risk of vehicle rolling Driver door
open and transmission not in P ...........647
Ru n Flat Indicator inope rative ............. 652
#See Owner's Manual ................... 638
Speed limit (winter tyres) XXX km/h ... 636
Speed Limit Assi stinope rative ........... .631
Ù Steering malfunction Incre ased
ph ysical ef fort See Owner's Manual .... 659
ÙSt eering malfunction Stop
immediately See Owner's Manual .......659
St op vehicle Lea veengine running
Wa itTransmission cooling ...................649
#St opvehicle Lea veengine run‐
ning ..................................................... 639
#St opvehicle See Owner's Man‐
ual .......................................................6 38
çsuspended .................................. 634
bSwitch off lights .......................... 663 bSwitch on headla
mps.................. 663
To shift out of P or N,depress brake
and start engine .................................. 647
Ø Top up AdBlue Perf.re duced in
XXX miles See Owner's Manual ...........645
Ø Top up AdBlue Perf.re duced:
XXX km/h Nostart in XXX km ............645
To p up coolant See Owner ’sManual ... 637
¥To p upwasher fluid .................... .661
Tr af fic Sign Assi stcur rently una vaila‐
ble See Owner's Manual ...................... 631
Tr af fic Sign Assi stinope rative ............. 631
ïTr ailer coupling extending… ......... 657
Tr ansmission Malfunction Stop ........... 648
! Turn on the ignition torelease
th e parking brake ................................. 61 5
h Tyre press. monitor cur rently
una vailable .......................................... 650
hTy repress. monitor inoperative
No wheel sensors ................................ 651692
Index

hTy
repress. monitor inoperative ...651
Ty re pressure Check tyres ...................649
Ty re(s) ove rheated ...............................6 53
Ve hicle rising Please wait.................... 626
ÁVe hiclerising ...............................6 26
hWa rning tyre defect .....................653
hWheel sensor(s) missing ............. 652
Wi thout changing gear, consult work‐
shop ....................................................6 48
Display on the windscreen
see Head-up display
Distance control see Active Dis tance Assi stDISTRONIC
Di stance recorder
see Trip dis tance
DI STRO NIC
see Active Dis tance Assi stDISTRONIC
Door Additional door lock .............................. 86
Child saf ety lock (rear door) .................. 79
Locking (emer gency key) ...................... .91
Opening (from the inside) ......................87 Po
we r closing function ......................... .91
Un locking (emer gency key) .................... 91
Un locking (from the inside) ...................87
Door cont rol panel .................................... .14
Door cont rol panel (rear) .......................... 16
Downhill driving assistance see DSR
Dr aw bar
see Tow- bar sy stem
Drinks holder see Cup holder
Drive Away Assist .................................... 298
Drive Away Assist
see Pr otection against collision
Drive position Enga ging ..............................................2 07
Drive prog ram display ............................ 204
Drive prog rams
see DYNA MIC SELECT
Driver's seat see Seat Driving abroad
Symmetrical dipped beam ...................1 57
Driving light see Automatic driving lights
Driving saf ety sy stem ............................ .228
ABS (Anti-lock Braking Sy stem) ........... 229
Ac tive Brake Assi st.............................. 235
Ad aptive brake lights .......................... .241
BA S (Brake Assi stSystem) .................. 229
EBD (Elect ronic Brake forc e Distribu‐
tion) ..................................................... 235
ESP ®
Crosswind Assist ........................ 234
ESP ®
trailer stabilisation .................... .234
Off-road ABS ....................................... 229
Overview ............................................. 228
Ra dar sensors .....................................2 28
Re sponsibility ...................................... 228
ST EER CONTROL ................................. 235
Driving sy stem
see 360° Camera
see Active Blind Spot Assi st
see ACTIVE BODY CONTROL
see Active Dis tance Assi stDISTRONIC
see Active Emergency Stop Assist Index
693