check engine light MERCEDES-BENZ GLS 2017 Owners Manual

Cockpit
Overview .......................................... 33
see Instrument cluster
Collapsible spare wheel
Inflating ........................................ .3 74
see Emergency spare wheel
COMAND
Driving dynamics display ............... 221
Switching on/off ........................... 288
COMAND display
Cleaning ......................................... 329
Combination switch .......................... 113
Connecting a USB device
see also Digital Operator's Man-
ual .................................................. 287
Consumption statistics (on-board
computer) .......................................... 232
Controller ........................................... 288
Convenience closing feature .............. 87
Convenience opening feature ............ 87
Coolant (engine)
Checking the level ......................... 322
Display message ............................ 257
Filling capacity ............................... 383
Important safety notes .................. 382
Temperature (on-board computer,
Mercedes-AMG vehicles) ............... 241
Temperature gauge ........................ 230
Warning lamp ................................. 283
Cooling
see Climate control
Copyright ............................................. 32
Cornering light function
Display message ............................ 256
Crash-responsive emergency light-
ing ....................................................... 117
Crosswind Assist ................................. 69
Crosswind driving assistance ............ 69
Cruise control
Activating ....................................... 173
Activation conditions ..................... 173
Cruise control lever ....................... 172
Deactivating ................................... 173
Display message ............................ 267
Driving system ............................... 172
Function/notes ............................. 172
Important safety notes .................. 172 Storing and maintaining current
speed ............................................. 173
Cup holder
Center console .............................. 303
Important safety notes .................. 302
Rear compartm ent ......................... 303
T e
mperature controlled ................. 303
Third row of seats .......................... 304
Customer Assistance Center
(CAC) ..................................................... 29
Customer Relations Department ....... 29
D Data
see Technical data
Data carrier
Selecting ........................................ 235
Daytime running lamps
Display message ............................ 256
Function/notes ............................. 112
Switching on/off (on-board com-
puter) ............................................. 239
Declarations of conformity ................. 28
DEF
Adding ........................................... 156
Display message ............................ 260
Filling capacity ............................... 381
Important safety notes .................. 381
Diagnostics connection ...................... 29
Differential lock (display mes-
sage) ................................................... 263
Digital speedometer ......................... 233
DIRECT SELECT lever
Automatic transmission ................. 146
Display messages
ASSYST PLUS ................................ 323
Calling up (on-board computer) ..... 244
Driving systems ............................. 261
Engine ............................................ 257
General notes ................................ 243
Hiding (on-board computer) ........... 243
KEYLESS-GO .................................. 273
Lights ............................................. 256
Safety systems .............................. 245
SmartKey ....................................... 273
Tires ............................................... 268
Vehicle ........................................... 2708
Index

Starting the engine with the
SmartKey ....................................... 140
Starting via smartphone ................ 140
Starting with KEYLESS-GO ............. 140
Switching off .................................. 160
Tow-starting (vehicle) ..................... 343
Engine electronics
Problem (malfunction) ................... 144
Engine jump starting
see Jump starting (engine)
Engine oil
Adding ........................................... 321
Additives ........................................ 382
Checking the oil level ..................... 320
Checking the oil level using the
dipstick .......................................... 321
Display message ............................ 259
Filling capacity ............................... 382
Notes about oil grades ................... 381
Notes on oil level/consumption .... 320
Temperature (on-board computer,
Mercedes-AMG vehicles) ............... 241
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) ... 241
Characteristics ................................. 67
Deactivating/activating ................... 67
Display message ............................ 245
Function/notes ................................ 66
General notes .................................. 66
Important safety information ........... 67
Trailer stabilization ........................... 68
Warning lamp ................................. 279
ETS/4ETS (Electronic Traction Sys-
tem) ...................................................... 66
Exhaust check ................................... 163
Exhaust pipe (cleaning instruc-
tions) .................................................. 328
Exterior lighting
see Lights
Exterior mirrors
Adjusting ....................................... 107 Dipping (automatic) ....................... 109
Folding in when locking (on-board
computer) ...................................... 240
Folding in/out (automatically) ....... 108
Folding in/out (electrically) ........... 108
Out of position (trouble shoo ting) ... 109
Se
tting ........................................... 108
Storing settings (memory func-
tion) ............................................... 110
Storing the parking position .......... 109
Eyeglasses compartment ................. 296
F Favorites
Overview ........................................ 289
Filler cap
see Refueling
Flat tire
MOExtended tires .......................... 332
Preparing the vehicle ..................... 331
TIREFIT kit ...................................... 333
see Emergency spare wheel
Floormats ........................................... 318
Fog lamps (extended range) ............. 115
Folding the rear bench seat for-
wards/back ....................................... 297
Fording
Off-road ......................................... 167
On flooded roads ........................... 166
Frequencies
Mobile phone ................................. 376
Two-way radio ................................ 376
Fuel
Additives ........................................ 380
Consumption statistics .................. 232
Displaying the current consump-
tion ................................................ 233
Displaying the range ...................... 233
Driving tips .................................... 162
Fuel gauge ....................................... 34
Grade (gasoline) ............................ 379
Important safety notes .................. 379
Low outside temperatures ............. 380
Problem (malfunction) ................... 156
Quality (diesel) ............................... 380
Refueling ........................................ 153
Tank content/reserve fuel ............. 379 Index 11

Mounting wheels
Lowering the vehicle ...................... 370
Mounting a new wheel ................... 369
Preparing the vehicle .................... .3 67
Raising the vehicle ......................... 368
Removing a wheel .......................... 369
Securing the vehicle against roll-
ing away ........................................ 367
MP3
Operation ....................................... 235
see also Digital Operator's Man-
ual ................................................. .2 87
see separate operating instructions
Multifunction display
Function/notes ............................ .2 31
Permanent display ......................... 238
Multifunction steering wheel
Operating the on-board computer .. 230
Overview .......................................... 35
Multimedia system
see Separate operating instructions
Music files
see also Digital Operator's Man-
ual ................................................. .2 87
N
Navigation
Menu (on-board computer) ............ 233
see also Digital Operator's Man-
ual ................................................. .2 87
see separate operating instructions
Notes on breaking-in a new vehi-
cle ....................................................... 137
O
Occupant Classification System
(OCS)
Conditions ....................................... 49
Faults ............................................... 52
Operation ......................................... 49
System self-test ............................... 51
Occupant safety
Air bags .......................................... .4 6
Automatic measures after an acci-
dent ................................................. 56
Children in the vehicle ..................... 57
Important safety notes .................... 41 Introduction to the restraint sys-
tem .................................................. 41
Occupant Classification System
(OCS) ............................................... 48
PASSENGER AIR BAG indicator
lamps ............................................... 42
Pets in the vehicle ........................... 62
PRE-SAFE ®
(anticipatory occu-
pant protection) ............................... 55
PRE-SAFE ®
PLUS (anticipatory
occupant protection PLUS) .............. 56
Restraint system warning lamp ........ 42
Seat belt .......................................... 42
OCS
Conditions ....................................... 49
Faults ............................................... 52
Operation ......................................... 49
System self-test ............................... 51
Odometer ........................................... 232
Off-road driving
Approach/departure angle ............ 386
Checklist after driving off-road ...... 169
Checklist before driving off-road .... 169
Fording depth ................................ 385
General information ....................... 168
Important safety notes .................. 168
Maximum gradient climbing abil-
ity .................................................. 386
Traveling uphill ............................... 171
Off-road lights .................................... 115
Off-Road program (vehicles with-
out Off-Road Engineering package)
Function/notes ............................. 217
Off-road programs (vehicles with
Off-Road Engineering package)
Function/notes ............................. 218
Off-road drive program .................. 218
Offroad Plus drive program ............ 218
Off-road programs (vehicles with
the Off-Road Engi neerin g package)
Di splays in the COMAND display ... 221
Off-road system
4MATIC .......................................... 215
DSR ............................................... 216
LOW RANGE off-road gear ............. 219
Off-road 4ETS .................................. 67
Off-road ABS .................................... 64 Index 15

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 u restraint system warning lamp in 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 u restraint
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 C and
PASSENGER AIR BAG OFF indicator lamp D are
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 48) and on "Chil-
dren in the vehicle" ( Y
page 57). There you
w ill 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 48). Be sure to
observe the notes on "Seat
belts“ ( Y
page 42) and "Air bags"
( Y
page 46). 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 vehicle42
Occupant safety
Safety

Never leave animals unattended in the vehi-
cle. Always secure animals properly during
the journey, e.g. use a suitable animal trans-
port box.
Driving safety systems
Overview of driving safety systems In this section, you will find information about
the following driving safety systems: R
ABS ( A nti-lock B raking S ystem)
( Y
page 63) R
BAS ( B rake A ssist S ystem) ( Y
page 64)R
Active Brake Assist ( Y
page 64)R
ESP ®
( E lectronic S tability P rogram)
( Y
page 67) R
EBD ( E lectronic B rake force D istribution)
( Y
page 69) R
ADAPTIVE BRAKE ( Y
page 69)R
Active Brake Assist with cross-traffic function
( Y
page 69) R
STEER CONTROL ( Y
page 72)
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 346).
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 % 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 63).
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 245).
Braking 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.Driving safety systems 63
Safety Z

If activated in the multimedia system, the loca-
tor lighting also lights up in the dark (see sepa-
rate operating instructions). X
To open the tailgate automatically from
outside the vehicle: press and hold the T
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 T button 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 140).
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
7 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 C
or D .
Make sure that you do not touch the inner
surface of the door handle. X
Convenience closing feature: touch
recessed sensor surface D for an extended
period.
Further information on the convenience closing
feature ( Y
page 87).
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 the 7 button 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 77).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. SmartKey 75
Opening and closing Z

Problem
Possible causes/consequences and P Solutions
There is interference from a powerful source of radio waves. X
Unlock ( Y
page 81) or lock ( Y
page 81) 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 81) or lock ( Y
page 81) 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 338).
or X
Jump-start the vehicle ( Y
page 338).
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 77) and replace it if necessary
( Y
page 77).
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. SmartKey 79
Opening and closing Z

Problems with the windshield wipers Problem
Possible causes/consequences and P Solutions
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.122
Windshield wipers
Lights and windshield wipers

ignite if in contact with the exhaust system or
parts of the engine that heat up. There is a risk
of fire.
Carry out regular checks to make sure that
there are no flammable foreign materials in
the engine compartment or in the exhaust
system.
General notes Vehicles with a gasoline engine: the catalytic
converter is preheated for up to 30 seconds
after a cold start. The sound of the engine may
change during this time.
Automatic transmission X
Shift the transmission to position P
( Y
page 146).
The transmission position display in the mul-
tifunction display shows P ( Y
page 148).
i You can start the engine in transmission
position P and N .
Starting procedure with the SmartKey X
To start a diesel engine : turn the SmartKey
to position 2 in the ignition lock ( Y
page 138).
The \( preglow indicator lamp in the instru-
ment cluster lights up. X
Turn the SmartKey to position 3 in the ignition
lock and release it as soon as the engine is
running ( Y
page 138).
i Vehicles with a diesel engine: you can
start the engine without preglow if the engine
is warm.
Using KEYLESS-GO to start the engine The Start/Stop button can be used to start the
vehicle without inserting the SmartKey into the
ignition lock. The Start/Stop button must be
inserted in the ignition lock and the SmartKey
must be in the vehicle. This mode for starting the
engine operates independently of the ECO
start/stop automatic engine start function. X
Depress the brake pedal and keep it
depressed. X
Press the Start/Stop button once
( Y
page 138).
Vehicles with a gasoline engine: the engine
starts.
Vehicles with a diesel engine: preglow is
activated and the engine starts.
Starting procedure via smartphone Observe the important safety notes on starting
the engine ( Y
page 139).
You can also start your engine via your smart-
phone from outside the vehicle. In this case, the
previously selected climate control setting is
activated. In this way you can cool or heat the
interior of the vehicle before starting the jour-
ney.
Only start the engine via your smartphone if it is
safe to start and run the engine where your vehi-
cle is parked.
Observe the legal stipulations in the area where
your vehicle is parked. Engine start via smart-
phone may be limited to certain countries or
regions.
You can execute a maximum of two consecutive
starting attempts via your smartphone. If you
insert the SmartKey into the ignition lock, you
can carry out two more starting attempts.
Once you have started the engine, you can
switch the engine off via your smartphone at any
time.
You can only start the engine via your smart-
phone if: R
the SmartKey is in the ignition lock R
park position P is selected R
the accelerator pedal is not depressed R
the anti-theft alarm system is not activated R
the panic alarm is not activated R
the hazard warning lamps are switched off R
the hood is closed. R
the doors are closed and locked R
the windows and sliding sunroof are closed
Also make sure that: R
the fuel tank is sufficiently filled R
the starter battery is sufficiently charged140
Driving
Driving and parking

Problem
Possible causes/consequences and P Solutions
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 322). Observe the warning notes
as you do so and add coolant if necessary.
DYNAMIC SELECT controller Use the DYNAMIC SELECT controller to change
the drive program. Depending on the drive pro-
gram selected the following vehicle character-
istics will change: R
the drive (engine and transmission manage-
ment) R
the transmission R
the suspension R
the steering R
the availability of the ECO start/stop function
Each time you start the engine with the Smart-
Key or the Start/Stop button, the Comfort drive
program is activated. For further information
about starting the engine, see ( Y
page 139).
X
All vehicles (except Mercedes-AMG vehi-
cles): turn DYNAMIC SELECT controller C as many times as necessary until the desired
drive program is selected.
The selected drive program appears in the
multifunction display. After five seconds the
display goes out.
In addition, the current drive program settings
are displayed in the multimedia system dis-
play.
Drive programs available (all vehicles
except Mercedes-AMG vehicles):
Individual
Individual settings
Sport
Sporty driving characteris-
tics
Comfort
Comfortable and economi-
cal driving characteristics
Slippery
Optimal driving characteris-
tics on slippery or snow-
covered roads
Off-road
Optimal driving characteris-
tics for easily negotiable off-
road terrain
Offroad Plus
(vehicles with
Off-Road Engi-
neering pack-
age) Optimal driving characteris-
tics for rough terrainDYNAMIC SELECT controller 145
Driving and parking Z