check engine light MERCEDES-BENZ GLS SUV 2019 Owner's Manual

Engaging reverse gear ................... 148
Engaging the park position ............ 148
Important safety note
s.................. 148
Kickdown ....................................... 151
Manual shifting .............................. 152
Oil temperature (on-board com-
puter, Mercedes-AMG vehicles) ..... 242
Overview ........................................ 148
Problem (malfunction) ................... 155
Pulling away ................................... 143
Starting the engine ........................ 142
Steering wheel paddle shifters ...... 152
Trailer towing ................................. 151
Transmission position display ........ 149
Transmission positions .................. 150
Automatic transmission emer-
gency mode ....................................... 155
AUX jacks
CD/DVD drive ............................... 294
Axle load, permissible (trailer tow-
ing) ...................................................... 392 B
Back button ....................................... 288
Bag hook ............................................ 300
Ball coupling
Installing ........................................ 223
Removing ....................................... 226
BAS (Brake Assist System) ................. 67
Battery (SmartKey)
Checking .......................................... 80
Important safety notes .................... 80
Replacing ......................................... 80
Battery (vehicle)
Charging ........................................ 342
Display message ............................ 259
Important safety notes .................. 340
Jump starting ................................. 343
Overview ........................................ 340
Replacing ....................................... 343
Belt
see Seat belts
Belt warning ......................................... 48
Bicycle rack ....................................... 227
Blind Spot Assist
Activating/deactivating ................. 239
Display message ............................ 265 Notes/function .............................. 207
Trailer towing ................................. 208
see Active Blind Spot Assist
Bluetooth ®
Searching for a mobile phone ........ 291
Searching for a mobile phone
(device manager) ........................... 292
see also Digital Operator's Man-
ual .................................................. 287
Telephony ...................................... 291
Brake Assist System
see BAS (Brake Assist System)
Brake fluid
Display message ............................ 251
Notes ............................................. 387
Brake force distribution
see EBD (electronic brake force
distribution)
Brake lamps
Display message ............................ 257
Brake linings
Display message ............................ 251
Brakes
ABS .................................................. 66
BAS .................................................. 67
Brake fluid (notes) ......................... 387
Braking assistance appropriate to
the situation ..................................... 69
Display message ............................ 246
High-performance brake system .... 164
Hill start assist ............................... 143
Important safety notes .................. 163
Maintenance .................................. 164
Parking brake ................................ 159
Riding tips ...................................... 163
Warning lamp ................................. 276
Braking assistance appropriate to
the situation
Function/note s................................ 69
Breakdown assistance
Where will I find...? ........................ 334
see Flat tire
see Towing away
Brightness control (instrument
cluster lighting) ................................... 37
Bulbs
see Replacing bulbs 6
Index

Problem with the rear window
defroster ........................................1 35
Problems with cooling with air
dehumidification ............................ 132
Rear control panel ......................... 127
Rear control panel (3-zone auto-
matic climate control with addi-
tional rear-compartment climate
control) .......................................... 129
Refrigerant ..................................... 388
Refrigerant filling capacity ............. 389
Setting the air distribution ............. 133
Setting the air vents ..................... .136
Setting the airflow ......................... 133
Setting the climate mode (AIR
FLOW) ............................................ 132
Setting the temperature ................ 132
Switching air-recirculation mode
on/off ............................................ 135
Switching on/off ........................... 131
Switching residual heat on/off ...... 135
Switching the rear window
defroster on/off ............................ 134
Switching the ZONE function
on/off ............................................ 133
Coat hooks ......................................... 301
Cockpit
Overview .......................................... 36
see Instrument cluster
Collapsible spare wheel
Inflating ......................................... 381
see Emergency spare wheel
COMAND
Driving dynamics displa y............... 220
COMAND display
Cleaning ......................................... 331
Combination switch .......................... 116
Connecting a USB device
see also Digital Operator's Man-
ual .................................................. 287
Consumption statistics (on-board
computer) .......................................... 233
Controller ........................................... 288
Convenience closing feature .............. 90
Convenience opening feature ............ 90
Coolant (engine)
Checking the level ......................... 324 Display message ............................ 258
Filling capacity ............................... 388
Important safety notes .................. 387
Temperature (on-board computer, Mercedes-AMG vehicles) ............... 242
Temperature gaug e........................ 231
Warning lamp ................................. 283
Cooling
see Climate control
Copyright ............................................. 35
Cornering light function
Display message ............................ 257
Crash-responsive emergency light-
ing ....................................................... 120
Crosswind Assist ................................. 71
Crosswind driving assistance ............ 71
Cruise control
Activating ....................................... 171
Activation conditions ..................... 171
Cruise control lever ....................... 171
Deactivating ................................... 172
Display message ............................ 267
Driving system ............................... 171
Function/note s............................. 171
Important safety notes .................. 171
Storing and maintaining current
speed ............................................. 171
Cup holder
Center console .............................. 304
Important safety notes .................. 303
Rear compartment ......................... 304
Temperature controlled ................. 304
Third row of seats .......................... 305
Customer Assistance Center
(CAC) ..................................................... 32
Customer Relations Department ....... 32 D
Data see Technical data
Data carrier
Selecting ........................................ 236
Daytime running lamps
Display message ............................ 257
Function/note s............................. 115
Switching on/off (on-board com-
puter) ............................................. 240 8
Index

Important safety notes .................. 378
Removing ....................................... 379
Storage location ............................ 379
Stowing .......................................... 379
Emergency Tensioning Devices
Activation .........................................56
Emergency unlocking
Tailgat e ............................................ 88
Emissions control
Service and warranty information .... 28
Engine
Check Engine warning lamp .......... .282
Display message ............................ 258
ECO start/stop function ................ 144
Engine number ............................... 384
Irregular running ............................ 146
Jump-starting ................................. 343
Starting (important safety notes) ... 141
Starting problems .......................... 146
Starting the engine with the
SmartKey ....................................... 142
Starting via smartphone ................ 142
Starting with KEYLESS-GO ............. 142
Switching off .................................. 158
Tow-starting (vehicle) ..................... 349
Engine electronics
Problem (malfunction) ................... 146
Engine oil
Adding .......................................... .323
Additives ........................................ 387
Checking the oil level ..................... 322
Checking the oil level using the
dipstick .......................................... 323
Display message ............................ 260
Filling capacity ............................... 387
Notes about oil grades ................... 386
Notes on oil level/consumption .... 322
Temperature (on-board computer, Mercedes-AMG vehicles) .............. .242
Engine switch-off
see ECO start/stop function
Entering an address
see also Digital Operator's Man-
ual ................................................. .287
ESP ®
(Electronic Stability Pro-
gram)
AMG menu (on-board computer) ... 243
Characteristics ................................. 70 Deactivating/activating ................... 71
Display message ............................ 246
Function/notes ................................ 69
General notes .................................. 69
Important safety information ........... 70
Warning lamp ................................. 279
ETS/4ETS (Electronic Traction Sys-
tem) ...................................................... 70
Exhaust check ................................... 161
Exhaust pipe (cleaning instruc-
tions) ................................................. .331
Exterior lighting
see Lights
Exterior mirrors
Adjusting ....................................... 110
Dipping (automatic) ....................... 112
Folding in when locking (on-boardcomputer) ...................................... 242
Folding in/out (automatically) ....... 111
Folding in/out (electrically) ........... 111
Out of position (troubleshooting) ... 111
Setting ........................................... 111
Storing settings (memory func-
tion) ............................................... 113
Storing the parking position .......... 112
Eyeglasses compartment ................. 297 F
Favorites Overview ........................................ 289
Filler cap
see Refueling
Flat tire
MOExtended tire s.......................... 336
Preparing the vehicle ..................... 335
TIREFIT kit ...................................... 337
see Emergency spare wheel
Floormats ........................................... 319
Fog lamps (extended range) ............. 118
Folding the rear bench seat for-
wards/back ....................................... 298
Fording
Off-road ......................................... 165
On flooded roads ........................... 165
Frequencies
Mobile phone ................................. 382
Two-way radio ................................ 382 Index
11

Instrument cluster
Function Page
0043
Speedometer with segments 230
Warning and indicator lamps:
00BB
ESP®
OFF 279
0025
ABS 277
Brakes 276
0027
(USA only) 004D
(Canada only) 0058
Low-beam headlamps 116
0060
Parking lamps 116
00E5
ESP® 279
0057
High-beam headlamps 116
Electric parking brake (red) 282
0049
(USA only) 0024
(Canada only) 0024
Electric parking brake
(yellow) 282
00BA
Distance warning 285
0044
003E003D
Turn signals 116 Function Page
0087
Multifunction display 232
0085
Tachometer 230
Warning and indicator lamps:
005E
Rear fog lamp 116
00B9
Check Engine 282
0077
Tire pressure monitor 286
0075
Restraint system 45
00E9
Seat belts 275
0083
Coolant temperature gauge 231
Warning and indicator lamps:
00AC
Coolant 283
0084
Fuel level indicator
Warning and indicator lamps:
00B6
Reserve fuel with fuel
filler flap location indicator
(right-hand side) 282
006B
Instrument cluster lighting 230
i
Information on displaying the outside tem-
perature in the multifunction display can be found under "Outside temperature display"
(Y
page 230). Instrument cluster
37At a glance

Restraint system warning lamp
The functions of the restraint system are
checked after the ignition is switched on and at
regular intervals while the engine is running.
Therefore, malfunctions can be detected in
good time.
The 0075 restraint system warning lamp on the
instrument cluster lights up when the ignition is switched on. It goes out no later than a few sec-
onds after the vehicle is started. The compo-
nents of the restraint system are in operational
readiness.
A malfunction has occurred if the 0075restraint
system warning lamp:
R does not light up after the ignition is switched
on
R does not go out after a few seconds with the
engine running
R lights up again while the engine is running G
WARNING
If the restraint system is malfunctioning,
restraint system components may be trig-
gered unintentionally or may not deploy as
intended during an accident. This can affect
for example the Emergency Tensioning
Device or the air bag. This poses an increased risk of injury or even fatal injury.
Have the restraint system checked and
repaired in a qualified specialist workshop as
soon as possible. PASSENGER AIR BAG indicator lamp
PASSENGER AIR BAG ON indicator lamp
0043and
PASSENGER AIR BAG OFF indicator lamp 0044are
part of the Occupant Classification System
(OCS). The indicator lamps display the status of the
front-passenger front air bag.
R PASSENGER AIR BAG ON lights up for 60 sec-
onds, subsequently both indicator lamps are
off (PASSENGER AIR BAG ON and OFF): the
front-passenger front air bag is able to deploy in the event of an accident.
R PASSENGER AIR BAG OFF lights up: the front-
passenger front air bag is deactivated. It will
then not be deployed in the event of an acci-
dent.
If the PASSENGER AIR BAG ON indicator lamp is
off, only the PASSENGER AIR BAG OFF indicator lamp shows the status of the front-passenger
front air bag. The PASSENGER AIR BAG OFF
indicator lamp may be lit continuously or be off.
Depending on the person in the front-passenger seat, the front-passenger front air bag must
either be deactivated or enabled; see the fol-
lowing points. You must make sure of this both
before and during a journey.
R Children in a child restraint system:
whether the front-passenger front air bag is
enabled or deactivated depends on the instal-
led child restraint system, and the age and
size of the child. Therefore, be sure to observe
the notes on the "Occupant Classification
System (OCS)" (Y page 51) and on "Chil-
dren in the vehicle" (Y page 59). There you
will also find instructions on rearward and
forward-facing child restraint systems on the
front-passenger seat.
R All other persons: depending on the classi-
fication of the person in the front-passenger
seat, the front-passenger front air bag is ena-
bled or deactivated (Y page 51). Be sure to
observe the notes on "Seat
belts“ (Y page 45) and "Air bags"
(Y page 49). There you can also find infor-
mation on the correct seat position. Seat belts
Introduction Seat belts are the most effective means of
restricting the movement of vehicle occupants
in the event of an accident or the vehicle rolling
over. This reduces the risk of vehicle occupants
coming into contact with parts of the vehicle
interior or being ejected from the vehicle. Fur-
thermore, the seat belt helps to keep the vehicle Occupant safety
45Safety Z

Never leave animals unattended in the vehi-
cle.
Always secure animals properly when driving, for instance with a suitable pet carrier. Driving safety systems
Overview of driving safety systems
In this section, you will find information about
the following driving safety systems:
R ABS (Anti-lock BrakingSystem)
(Y page 66)
R BAS ( Brake Assist System) (Y page 67)
R Active Brake Assist (Y page 67)
R ESP ®
(Electronic StabilityProgram)
(Y page 70)
R EBD ( Electronic Brake force Distribution)
(Y page 72)
R ADAPTIVE BRAKE (Y page 72)
R Active Brake Assist with cross-traffic function
(Y page 72)
R Active Steering Assist STEER CONTROL
(Y page 75) Important safety notes
If you fail to adapt your driving style or if you are
inattentive, the driving safety systems can nei-
ther reduce the risk of an accident nor override the laws of physics. Driving safety systems are
merely aids designed to assist driving. You are
responsible for maintaining the distance to the
vehicle in front, for vehicle speed, for braking in
good time, and for staying in lane. Always adapt your driving style to suit the prevailing road and
weather conditions and maintain a safe distance from the vehicle in front. Drive carefully.
The driving safety systems described only work
as effectively as possible when there is ade-
quate contact between the tires and the road
surface. Pay particular attention to the informa- tion regarding tires, recommended minimum
tire tread depths etc. in the "Wheels and tires"
section (Y page 352).
In wintry driving conditions, always use winter
tires (M+S tires) and if necessary, snow chains.
Only in this way will the driving safety systems
described in this section work as effectively as
possible. ABS (Anti-lock Braking System)
General information ABS regulates brake pressure in such a way that
the wheels do not lock when you brake. This
allows you to continue steering the vehicle when braking.
The 0025 ABS warning lamp in the instrument
cluster lights up when the ignition is switched
on. It goes out when the engine is running.
ABS works from a speed of about 5 mph
(8 km/h), regardless of road-surface conditions.
ABS works on slippery surfaces, even when you only brake gently.
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page 66). G
WARNING
If ABS is faulty, the wheels could lock when
braking. The steerability and braking charac-
teristics may be severely impaired. Addition-
ally, further driving safety systems are deac-
tivated. There is an increased danger of skid- ding and accidents.
Drive on carefully. Have ABS checked imme-
diately at a qualified specialist workshop.
When ABS is malfunctioning, other systems,
including driving safety systems, will also
become inoperative. Observe the information
on the ABS warning lamp (Y page 277) and dis-
play messages which may be shown in the
instrument cluster (Y page 246).
Brakes X
If ABS intervenes: continue to depress the
brake pedal vigorously until the braking sit-
uation is over.
X To make a full brake application: depress
the brake pedal with full force.
If ABS intervenes when braking, you will feel a
pulsing in the brake pedal.
The pulsating brake pedal can be an indication
of hazardous road conditions, and functions as a
reminder to take extra care while driving. 66
Driving safety systemsSafety

If activated in the multimedia system, the loca-
tor lighting also lights up in the dark (see the
Digital Operator's Manual).
X To open the tailgate automatically from
outside the vehicle:
press and hold the0054
button until the tailgate opens.
Vehicles with KEYLESS-GO: X To close the tailgate automatically from
outside the vehicle:
if the SmartKey is loca-
ted in the immediate vicinity of the vehicle,
press the 0054button on the SmartKey.
When the tailgate closes you can then release
the button. KEYLESS-GO
General notes Bear in mind that the engine can be started by
any of the vehicle occupants if there is a KEY-
LESS-GO key in the vehicle (Y page 142).
Locking/unlocking centrally You can start, lock or unlock the vehicle using
KEYLESS-GO. To do this, you only need carry the
SmartKey with you. You can combine the func-
tions of KEYLESS-GO with those of a conven-
tional SmartKey. Unlock the vehicle by using
KEYLESS-GO, for instance, and lock it using the 0037 button on the SmartKey.
The driver's door and the door at which the han- dle is used, must both be closed. The SmartKey
must be outside the vehicle. When locking or
unlocking with KEYLESS-GO, the distance
between the SmartKey and the corresponding
door handle must not be greater than 3 ft (1 m).
KEYLESS-GO checks whether a valid SmartKey
is in the vehicle by periodically establishing a
radio connection between the vehicle and the
SmartKey. This happens:
R when starting the engine
R while driving
R when the external door handles are touched
R during convenience closing X
To unlock the vehicle: touch the inner sur-
face of the door handle.
X To lock the vehicle: touch sensor surface 0043
or 0044.
Make sure that you do not touch the inner
surface of the door handle.
X Convenience closing feature: touch
recessed sensor surface 0044for an extended
period.
Further information on the convenience closing
feature (Y page 90).
If you pull on the handle of the tailgate, only the cargo compartment of the vehicle is unlocked.
Deactivating and activating If you do not intend to use a SmartKey for an
extended period of time, you can deactivate the
KEYLESS-GO function of the SmartKey. The
SmartKey will then use very little power, thereby conserving battery power. For the purposes of
activation/deactivation, the vehicle must not be
nearby.
X To deactivate: press the0037button on the
SmartKey twice in rapid succession.
The battery check lamp of the SmartKey
flashes twice briefly and lights up once, KEY-
LESS-GO is deactivated (Y page 80).
X To activate: press any button on the Smart-
Key.
or X Insert the SmartKey into the ignition lock.
KEYLESS-GO and all of its associated features are available again. 78
SmartKeyOpening and closing

Problem
Possible causes/consequences and
0050
0050Solutions There is interference from a powerful source of radio waves.
X Unlock (Y page 84) or lock (Y page 84) the vehicle using the
mechanical key. KEYLESS-GO is malfunctioning.
X Lock/unlock the vehicle using the remote control function of the
SmartKey.
X Have the vehicle and SmartKey checked at a qualified specialist
workshop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function:
X Unlock (Y page 84) or lock (Y page 84) the vehicle using the
mechanical key.
X Have the vehicle and SmartKey checked at a qualified specialist
workshop. The engine cannot be
started using the Smart-
Key. The on-board voltage is too low.
X Switch off non-essential consumers, e.g. seat heating or interior
lighting, and try to start the engine again.
If this does not work:
X Check the starter battery and charge it if necessary (Y page 342).
or X Jump-start the vehicle (Y page 343).
or X Consult a qualified specialist workshop. The engine cannot be
started using the Start/
Stop button. The Smart-
Key is in the vehicle. The vehicle is locked.
X Unlock the vehicle and try to start the vehicle again. The SmartKey battery is discharged or nearly discharged.
X Check the SmartKey battery (Y page 80) and replace it if necessary
(Y page 80).
If this does not work: X Start your vehicle with the SmartKey in the ignition lock. There is interference from a powerful source of radio waves.
X Start your vehicle with the SmartKey in the ignition lock. You have lost a Smart-
Key. X
Have the SmartKey deactivated at a qualified specialist workshop.
X Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. You have lost the
mechanical key. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. 82
SmartKeyOpening and closing

X
Position new wiper blade 0043in the retainer on
the wiper arm and slide it into place in the
direction of the arrow.
The wiper blade audibly engages.
X Make sure that the wiper blade is seated cor-
rectly.
X Fold the wiper arm back onto the windshield.
Changing the rear window wiper blade Removing a wiper blade X
Remove the SmartKey from the ignition lock.
X Fold wiper arm 0043away from the rear window
until it engages.
X Position wiper blade 0044at a right angle to
wiper arm 0043.
X Hold wiper arm 0043and press wiper blade 0044
in the direction of the arrow until it releases.
X Remove wiper blade 0044.
Installing a wiper blade
X Place new wiper blade 0044onto wiper arm 0043.
X Hold wiper arm 0043and press wiper blade 0044
in the opposite direction to the arrow until it
engages.
X Make sure that wiper blade 0044is seated cor-
rectly.
X Position wiper blade 0044parallel to wiper
arm 0043.
X Fold wiper arm 0043back onto the rear window. Problems with the windshield wipers
Problem
Possible causes/consequences and
0050 0050Solutions The windshield wipers
are jammed. Leaves or snow, for example, may be obstructing the windshield wiper
movement. The wiper motor has been deactivated.
X For safety reasons, you should remove the SmartKey from the igni-
tion lock.
or X Switch off the engine using the Start/Stop button and open the
driver's door.
X Remove the cause of the obstruction.
X Switch the windshield wipers back on. The windshield wipers
fail completely. The windshield wiper drive is malfunctioning.
X Select another wiper speed on the combination switch.
X Have the windshield wipers checked at a qualified specialist work-
shop. 124
Windshield wipersLights and windshield wipers

If indicator lamp
0044is off, the ECO start/stop
function has been deactivated manually or as
the result of a malfunction. Problems with the engine
Problem
Possible causes/consequences and
0050 0050Solutions The engine does not
start. The starter motor
can be heard. R
There is a malfunction in the engine electronics.
R There is a malfunction in the fuel supply.
Before attempting to start the engine again:
X Turn the SmartKey in the ignition lock back to position 0092.
or X Press the Start/Stop button repeatedly until all indicator lamps in
the instrument cluster go out.
X Try to start the engine again (Y page 141). Avoid excessively long
and frequent attempts to start the engine as these will drain the
battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine does not
start. You cannot hear
the starter motor. The on-board voltage is too low because the battery is too weak or
discharged.
X Jump-start the vehicle (Y page 343).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop. The starter motor was exposed to a thermal load that was too high.
X Allow the starter motor to cool down for approximately two minutes.
X Try to start the engine again.
If the engine still does not start: X Consult a qualified specialist workshop. Vehicles with a gasoline
engine:
The engine is not running
smoothly and is misfir-
ing. There is a malfunction in the engine electronics or in a mechanical
component of the engine management system.
X Only depress the accelerator pedal slightly.
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it.
X Have the cause rectified immediately at a qualified specialist work-
shop. The coolant temperature
gage shows a value
above 248 ‡ (120 †). The coolant level is too low. The coolant is too hot and the engine is no
longer being cooled sufficiently.
X Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 324). Observe the warning notes
as you do so and add coolant if necessary. 146
DrivingDriving and parking