check engine light MERCEDES-BENZ GLS SUV 2020 Owners Manual

#
Toswitch on the po wer supp ly:press but‐
to n1 once.
Yo u can activate the windscreen wiper, for
ex ample.
The po wer supp lyis switched off again if thefo l‐
lowing conditions are me t:
R you open the driver's door.
R you press but ton1 twice more. #
Toswitch on the ignition: press button 1
twice.
The indicator lamps in the instrument clus ter
light up.
The ignition is switched off again if one of the
fo llowing conditions is me t:
R you do not start theve hicle within
15 minutes and the transmission is in posi‐
tion jorthe electric parking brake is
applied.
R you press but ton1 once. St
arting theve hicle St
arting theve hicle with thest art/s top but‐
ton &
DANG ER Risk of death caused by
ex haust gases
Combustion engines emit poisonous exhaust
ga ses such as carbon monoxide. Inhaling
th ese exhaust gases is hazardous tohealth
and leads topoisoning. #
Never lea vethe engine or, if present,
th e auxiliary heating running in an
enclosed space wi thout suf ficient venti‐
lation. &
WARNING Risk offire due toflammable
material in the engine compartment or
th eex haust sy stem
Flammable materials may ignite. #
Therefore, check regularly that there
are no flammable materials in the
engine compartment or on theex haust
sy stem. Re
quirements:
R theke y is in theve hicle and is recognised. #
Shift the transmission toposition jori. #
Depress the brake pedal and press button
1 once. #
Ifth eve hicle does not star t:switch off non-
essential consumers and press button 1
once. #
Ifth eve hicle still does not start and the dis‐
play message Place the key in the marked
space See Owner's Manual also appears in
th e multifunction display: start theve hicle
with theke y in the mar ked space (emer gency
operation mode) (/ page 189).
% You can swit choff the engine while driving
by pressing button 1for about thre e sec‐
onds or bypressing button 1thre e times
within thre e seconds. Be sure toobser vethe
saf ety no tes under "Driving tips"
(/ page 192). 18 8
Driving and pa rking

&
WARNING Risk ofexplosion during
ch arging process and starting assis tance
During thech arging process and starting
assis tance, the battery may release an explo‐
sive gas mixture. #
Avoid fire , naked flames, creating
spar ksand smoking. #
Make sure there is suf ficient ventila‐
tion. #
Do not lean over a batter y. &
WARNING Risk ofexplosion from a fro‐
zen battery
A dischar ged battery may freeze at temp era‐
tures slightly abo veor below freezing point.
During starting assis tance or battery charg‐
ing, bat tery gas can be released. #
Alw ays allow a battery tothaw before
ch arging it or per form ing starting assis‐
ta nce. If
th e indicator/warning lamps in the instrument
clus ter do not light up at low temp eratures, it is
ve ry likely that the dischar ged battery has fro‐
zen. In this case you may neither jump-s tart the
ve hicle nor charge the batter y.
The service life of a battery that has been
th awe d may be dramatically shor tened. The
st arting characteristics may be impaired, espe‐
cially at low temp eratures.
It is recommended that you ha veathaw ed bat‐
te ry checked at a qualified specialist workshop.
All vehicles
* NO
TEDama gecaused bynumerous or
ex tended attem ptsto start the engine Nume
rous or extended attem ptsto start the
engine may damage the catalytic con verter
due tonon-combu sted fuel. #
Avoid numerous and extended attem pts
to start the engine. Obser
vethefo llowing points during starting
assis tance and when charging the battery:
R Only use undamaged jump lead/charging
cables with a suf ficient cross-section and
insula tedte rm inal clamps.
R Non- insulated parts of thete rm inal clamps
must not come into con tact wi thother me tal
parts while the jump lead/charging cable is
connected tothe battery/jump-s tart connec‐
tion point.
R The jump lead/charging cable must not
come into contact wi thany parts which may
mo vewhen the engine is running.
R Alw ays make sure that nei ther you nor the
battery is elect rostatically charge d.
R Keep away from fire and naked flames.
R Do not lean overth e batter y.
Obser vethe additional following points when
ch arging the battery:
R Only use battery charge rs tested and
appr oved for Mercedes-Benz.
R Read the battery charge r's operating instruc‐
tions before charging the batter y. Breakdown assis
tance 383

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions #
Start the engine thre eto four times af terre fuelling.
If th eye llow engine diagnosis warning lamp goes out, emer gency operation mode is cancelled. The vehicle need
not be checked.
#
Elect rical fault warning
lamp *T
hered elect rical fault warning lamp is lit.
There is a fault in the electrics. #
Notethe messages on the multifunction displa y.
8
Fu elreser vewarning lamp
lights up *T
he yellow fuel reser ve wa rning lamp lights up while the engine is running.
The fuel supp lyhas dropped into there ser verange. #
Refuel. Displ
aymessa ges and warning/indicator lamps 497

Brakes
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
! Elect ric pa rking brake indi‐
cator lamp (red)
!
The elect ric pa rking brake
(yellow) indicator lamp *T
he red elect ric pa rking brake indicator lamp flashes or is lit.
The yellow elect ric pa rking brake indicator lamp also lights up in theev ent of a malfunction. #
Notethe messages on the multifunction displa y.
J
Brake sy stem warning lamp
(yellow) *T
he yellow brake sy stem warning lamp is lit while the engine is running. &
WARNING Risk of an accident due toa brake sy stem malfunction
If th e brake sy stem is malfunctioning, braking characteristics may be impaired. #
Drive on carefull y. #
Have the brake sy stem checked immediately at a qualified specialist workshop. #
Adjust your speed and drive on carefull y,leaving a suitable dis tance totheve hicle in front. #
Ifth e multifunction display sho wsa display message, obse rve it. 498
Display messages and warning/indicator lamps

Inserting/removing
theflacon (fra‐
gr ance sy stem)...................................... 178
Ionisation...............................................1 78
No te....................................................... 174
Re ar air vents........................................ 184
Re ar operating unit................................ 175
Re sidual heat......................................... 17 7
Re sidual heat (rear operating unit)........ 178
Setting (MBUX multimedia sy stem)....... 175
Setting the air distribution..................... 174
Setting the air flow ................................. 174
Setting the fragrance sy stem.................1 78
Setting theve hicle interior temp era‐
ture........................................................ 174
St ationary heater/ ventilation................ 180
Switching on/of f................................... 175
Switching there ar wind owheater
on/off....................................................1 74
THERMATIC contro l panel...................... 174
THERMOTRONIC contro l panel..............174
Ve ntilating theve hicle (con venience
opening).................................................. 94
Wi ndsc reen heating............................... 17 9
Coat hook .................................................. .144 Cockpit
Overview................................................... 6
Cof fee cup symbol
see ATTENTION ASSIST
Collapsible spare wheel Inflating.................................................. 411
No tes....................................................4 09
Re moving............................................... 41 0
Collision de tection (pa rked vehicle) ........ 223
Combination switch .................................. 15 8
Compu ter
see On-board computer
Consum ption indicator
Calling up.............................................. 204
Con venience closing ................................... 95
Con venience opening ..................................94
Coolant (engine) Check le vel............................................ 362
No tes..................................................... 424
Cooling see Climate control
Co pyright..................................................... 38 Cornering light
...........................................1 59
Co ver
see Roller sunblind
Cross Traf fic Alert..................................... 293
Crosswind Assist Function/no tes..................................... 228
Cruise control Activating.............................................. 235
Buttons.................................................. 235
Calling up a spee d................................. 235
Deactivating.......................................... 235
Fu nction................................................ 233
Re quirements........................................ 235
Selecting.............................................. .235
Setting a speed..................................... 235
St oring a speed.....................................2 35
Sy stem limitations................................. 233
Cup holder Switching the cooling/heating func‐
tion on/off............................................1 46
Cushionbag.................................................. 45 512
Index

¯
AdBlue sy stem fault Emer‐
ge ncy op. in XXX miles See Owner's
Manual.................................................. 487
¯ AdBlue sy stem fault Engine
st art not possible................................. .488
¯ AdBlue sy stem fault See Own‐
er's Manual .......................................... .487
5 Add 1 litre engine oil when
next refuelling....................................... 488
é ATTENTION ASSIST inoperative ....460
é ATTENTION ASSIS T:Take a
break!....................................................4 60
: Automatic driving lights inoper‐
ative...................................................... 439
Á Change key bat teries .................... 437
J Check brake fluid le vel................. 459
# Check brake pads See Owner's
Manual.................................................. 459
ï Check trailer hitch lo ck................ 443
h Check tyre(s)............................... .483 !
Clean the fuel filter ...................... 452
Á Compressor is cooling ..................473
ÿ Coolant Stop vehicle Switch
engine off..............................................4 51
_ Currently una vailable Camera
view restricted....................................... 469
ç Currently unavailable Radar
sensors dirty.........................................4 68
! currently una vailable See Own‐
er's Manual ............................................ 474
÷ currently una vailable See Own‐
er's Manual ............................................ 475
5 Engine oil le vel cannot be
measured .............................................. 490
5 Engine oil le velRe duce oil le vel.... 489
5 Engine oil le velSt op vehicle
Switch engine off.................................. 489
5 Engine oil pressure Stop
Switch off engine.................................. 490 ä
Fault Drive at max. 80 km/h
...................................................... 470, 471
ä Fault Stop.....................................4 71
6 Front left malfunction Consult
wo rkshop (e xample).............................. 434
& inoperative Battery low................ 442
& inoperative Refuel vehicle ............ 442
& inoperative See Owner's Man....... 441
! inoperative See Owner's Manual ..475
÷ inoperative See Owner's Manual ..476
T inoperative See Owner's Man‐
ual......................................................... 477
G Inoperative................................... 478
î inoperative................................... 463
: Intelligent Light Sy stem inoper‐
ative...................................................... 440
Á Key not de tected (red displ ay
messa ge)............................................... 438
Á Key not de tected (white displ ay
messa ge)............................................... 437 514
Index

;
Engine diagnosis warning lamp... .496
å ESP®
OFF warning lamp.............. .503
÷ ESP®
wa rning lamp flashes.......... 502
÷ ESP®
wa rning lamp lights up........ 503
8 Fuelreser vewarning lamp
lights up............................................... .497
Ù Powe rst eering warning lamp
(red)...................................................... 493
6 Restra int sy stem warning lamp... .492
ü Seat belt warning lamp flashes.... 492
ü Seat belt warning lamp lights
up......................................................... .493
ä Suspension warning lamp (red).... 501
ä Suspension warning lamp (yel‐
low)....................................................... 501
! The elect ric pa rking brake (yel‐
low) indicator lam p................................ 498
ï Trailer tow hit chwarning lamp..... 494
h Tyre pressure monitoring sys‐
te m wa rning lamp flashes.................... .504 h
Tyre pressure monitoring sys‐
te m wa rning lamp lights up................... 505
L Warning lamp for dis tance
wa rning function................................... 500
Wa rning/indicator lamps
Overview.............................................. .490
PA SSENGER AIR BAG.............................. 50
Wa rranty ...................................................... 34
Wa sher fluid
see Windsc reen washer fluid
Wa shing byhand (care)............................ 367
Wa ter tank
see Air-water duct
We ather information ................................. 329
We b br owsers
Overview (multimedia sy stem).............. 340
Wheel change
Fitting a new wheel............................... 406
Lo we ring theve hicle.............................4 06
Prepa ration........................................... 402
Ra ising theve hicle................................ 403
Re moving a whee l................................. 405 Re
moving/fitting hub caps................... .402
Wheel change
see Emergency spa rewheel
Wheel rotation........................................... 400
Wheels Care...................................................... 369
Changing hub caps................................ 402
Checking............................................... 393
Checking the tyre pressure (tyre
pressure monitoring sy stem)................. 396
Fitting.................................................... 406
Flat tyre.................................................3 74
Inter changing........................................ 400
MOExtended tyres................................ .375
No ise.................................................... .393
No tes on fitting..................................... 397
Re moving.............................................. 405
Re placing...................................... 397, 402
Re starting the tyre pressure monitor‐
ing sy stem.............................................3 97
Selection............................................... 397
Snow chains......................................... .393
St oring...................................................4 01
TIREFIT kit..............................................3 76
Ty re pressure (No tes)............................ 394 540
Index