ad blue MERCEDES-BENZ GLS-Class SUV 2017 X166 Owner's Manual

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cles and about Daimler AG can be found on the
following websites:
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You are welcome to forward any queries or sug-
gestions you may have regarding this Operator's
Manual to the technical documentation team at
the following address:
Customer Assistance Center
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3 Mercedes Drive
Montvale, NJ 07645-0350
©Daimler AG: not to be reprinted, translated or
otherwise reproduced, in whole or in part, with- out written permission from Daimler AG.
Vehicle manufacturer
Daimler AG
Mercedesstraße 137
70327 Stuttgart
Germany
Symbols
Registered trademarks:
RBluetooth®is a registered trademark of Blue-
tooth SIG Inc.
RDTS™ is a registered trademark of DTS, Inc.
RDolby®and MLP™ are registered trademarks
of DOLBY Laboratories.
RBabySmart™, ESP®and PRE-SAFE®are reg-
istered trademarks of Daimler AG.
RHomeLink®is a registered trademark of John-
son Controls.
RiPod®and iTunes®are registered trademarks
of Apple Inc.
RLogic7®is a registered trademark of Harman
International Industries.
RMicrosoft®and Windows media®are regis-
tered trademarks of Microsoft Corporation.
RSIRIUS®is a registered trademark of Sirius
XM Radio Inc.
RHD Radio™ is a registered trademark of iBiq-
uity Digital Corporation.
RGracenote®is a registered trademark of
Gracenote, Inc.
RZAGAT Survey®and related brands are regis-
tered trademarks of Zagat Survey, LLC.
In this Operator's Manual you will find the fol-
lowing symbols:
GWARNING
Warning notes make you aware of dangers
which could pose a threat to your health or
life, or to the health and life of others.
HEnvironmental note
Environmental notes provide you with infor-
mation on environmentally aware actions or
disposal.
!Notes on material damage alert you to dan-
gers that could lead to damage to your vehi-
cle.
iPractical tips or further information that
could be helpful to you.
X This symbol indicates an instruction
that must be followed.
X Several of these symbols in succession
indicate an instruction with several
steps. (Y
page)
This symbol tells you where you can find
more information about a topic.
YY This symbol indicates a warning or an
instruction that is continued on the next
page.
Dis‐
playThis text indicates a message on the
multifunction display/multimedia dis-
play.
As at 28.09.2015

Axle load, permissible (trailer tow-
ing) ...................................................... 387
B
Back button ...................................... .288
Bag hook ............................................ 299
Ball coupling
Installing ........................................ 223
Removing ....................................... 227
BAS (Brake Assist System) ................. 64
Battery (SmartKey)
Checking .......................................... 77
Important safety notes .................... 77
Replacing ......................................... 77
Battery (vehicle)
Charging ........................................ 338
Display message ............................ 258
Important safety notes .................. 336
Jump starting ................................. 338
Overview ........................................ 336
Belt
see Seat belts
Blind Spot Assist
Activating/deactivating ................. 238
Display message ............................ 265
Notes/function .............................. 207
Trailer towing ................................. 209
see Active Blind Spot Assist
Blootooth
®
Connecting a different mobile
phone ............................................ 292
BlueTEC
Adding DEF ....................................1 56
BlueTEC (DEF) ....................................3 81
Bluetooth
®
Searching for a mobile phone ........2 91
see also Digital Operator's Man-
ual ..................................................2 87
Telephony ...................................... 290
Brake Assist
see BAS (Brake Assist System)
Brake fluid
Display message ............................ 250
Notes ............................................. 382
Brake force distribution
see EBD (electronic brake force
distribution) Brake lamps
Display message ............................ 256
Brakes
ABS ..................................................6 3
Adaptive Brake Assist ...................... 65
BAS .................................................. 64
Brake fluid (notes) ......................... 382
Display message ............................ 245
High-performance brake system .... 166
Hill start assist ............................... 141
Impo
rtant safety notes .................. 164
Maintenance .................................. 165
Parking brake ................................ 160
Riding tips ...................................... 164
Warning lamp ................................. 276
Breakdown
Where will I find...? ........................ 331
see Flat tire
see Towing away
Brightness control (instrument
cluster lighting) ................................... 34
Bulbs
see Replacing bulbs
C
CaliforniaImportant notice for retail cus-
tomers and lessees .......................... 26
Calling up a malfunction
see Display messages
Car
see Vehicle
Care
360° camera ................................. 328
Car wash ........................................ 324
Carpets .......................................... 330
Display ........................................... 329
Exhaust pipe .................................. 328
Exterior lights ................................ 327
Gear or selector lever .................... 329
Interior ........................................... 329
Matte finish ................................... 326
Notes ............................................. 324
Paint .............................................. 326
Plastic trim .................................... 329
Power washer ................................ 325
Rear view camera .......................... 328
6Index

Locking centrallysee Central locking
Locking verification signal (on-
board computer) .............................. .239
LOW RANGE
Display message ............................ 263
Off-road gear ................................. 219
LOW RANGE off-road gear ................ 219
Low-beam headlamps
Display message ............................ 256
Replacing bulbs .............................1 18
Switching on/off ........................... 113
Lumbar support
Adjusting (on the seat) .................. 103
Luxury head restraints ....................... 97
M
M+S tires............................................ 348
Malfunction message
see Display messages
Matte finish (cleaning instruc-
tions) ..................................................3 26
mbrace
Call priority ....................................3 11
Display message ............................ 250
Downloading destinations
(COMAND) ..................................... 312
Downloading routes ....................... 314
Emergency call .............................. 309
General notes ................................ 308
Geo fencing ................................... 315
Locating a stolen vehicle ...............3 13
MB info call button ........................ 311
Remote fault diagnosis .................. 313
Remote vehicle locking .................. 313
Roadside Assistance button .......... 310
Search & Send ............................... 312
Self-test ......................................... 309
Speed alert .................................... 314
System .......................................... 308
Triggering the vehicle alarm ........... 315
Vehicle remote unlocking .............. 313
Mechanical key
Function/notes ................................ 76
General notes .................................. 76
Inserting .......................................... 76
Locking vehicle ................................ 81 Removing ......................................... 76
Unlocking the driver's door .............. 81
Media Interface
USB port in the armrest of the
center console ............................... 295
see Digital Operator's Manual
Memory card (audio) ......................... 235
Memory function ............................... 110
Mercedes-Benz Intelligent Drive
360°camera .................................. 201
Active Blind Spot Assist ................. 210
Active Lane Keeping Assist ............ 213
ATTENTION ASSIST ........................ 205
Blind Spot Assist ............................ 207
Distance Pilot DISTRONIC ............. 174
Distance Pilot DISTRONIC with
Steering Pilot ................................. 180
General notes ................................ 172
Lane Keeping Assist ...................... 209
Parking Assist PARKTRONIC .......... 190
Parking Pilot .................................. 193
PRE-SAFE
®PLUS (anticipatory
occupant protectio n P
LUS) .............. 56
Rear view camera .......................... 197
Traffic Sign Assist .......................... 206
Message memory (on-board com-
puter) .................................................. 244
Mirror
Vanity mirror (sun visor) ................ 304
Mirror turn signal
Cleaning ......................................... 327
Mirrors
see Exterior mirrors
see Rear-view mirror
see Vanity mirror (in the sun visor)
Mobile phone
Connecting (Bluetooth
®inter-
face) .............................................. 290
Connecting another mobile
phone ............................................ 292
Frequencies ................................... 376
Installation ..................................... 376
Menu (on-board computer) ............ 235
Transmission output (maximum) .... 376
Modifying the programming
(SmartKey) ........................................... 76
MOExtended tires .............................. 332
14Index

Driver's and front-passenger seat
Rear seats
The three red indicator lamps in the button indi-
cate the heating level you have selected.
The system automatically switches down from
level3to level 2after approximately eight
minutes.
The system automatically switches down from
level 2to level 1after approximately ten
minutes.
The system automatically switches off approx-
imately 35 minutes after it is set to level 1.
XTurn the SmartKey to position 1or 2in the
ignition lock (Ypage 138).
XTo switch on: press button:repeatedly
until the desired heating level is set.
XTo switch off: press button:repeatedly
until all the indicator lamps go out.
iIf the battery voltage is too low, the seat
heating may switch off.
Activating and deactivating seat venti-
lation
The three blue indicator lamps in the buttons
indicate the ventilation level you have selected.
XTurn the SmartKey to position 1or 2in the
ignition lock (Ypage 138).
XTo switch on: press button:repeatedly
until the desired ventilation level is set.
XTo switch off: press button:repeatedly
until all the indicator lamps go out.
iIf the battery voltage is too low, the seat
ventilation may switch off.
iYou can open the side windows and the slid-
ing sunroof using the "Convenience opening"
feature (
Ypage 87). The seat ventilation of
the driver's seat automatically switches to the
highest level.
104Seats
Seats, steering wheel and mirrors

The blueKindicator lamp in the instru-
ment cluster lights up when the high-beam
headlamps are switched on.
XTo switch off the high-beam head-
lamps: move the combination switch back to
its normal position.
The blue Kindicator lamp in the instru-
ment cluster goes out.
Vehicles with Adaptive Highbeam Assist: if
Adaptive Highbeam Assist is activated, it auto-
matically controls activation and deactivation of
the high-beam headlamps (
Ypage 115).
Hazard warning lamps
XTo switch on the hazard warning
lamps: press button :.
All turn signals flash. If you now switch on a
turn signal using the combination switch, only
the turn signal lamp on the corresponding
side of the vehicle will flash.
XTo switch off the hazard warning lamps:
press button :.
The hazard warning lamps automatically switch
on if:
Ran air bag is deployed or
Rthe vehicle decelerates rapidly from a speed
of above 45 mph (70 km/h) and comes to a
standstill
The hazard warning lamps switch off automati-
cally if the vehicle reaches a speed of above
6 mph (10 km/h) again after a full brake appli-
cation.
iThe hazard warning lamps still operate if the
ignition is switched off.
Intelligent Light System
General notes
The Intelligent Light System is a system that
adjusts the headlamps automatically to suit the
prevailing driving and weather conditions. It
offers advanced functions for improved illumi-
nation of the road surface, e.g. depending on the
vehicle speed or weather conditions. The sys-
tem includes the active light function, cornering
light function, highway mode and extended
range fog lamps. The system is only active when
it is dark.
You can activate or deactivate the "Intelligent
Light System" using the on-board computer
(
Ypage 239).
Active light function
The active light function is a system that moves
the headlamps according to the steering move-
ments of the front wheels. In this way, relevant
areas remain illuminated while driving. This
allows you to identify pedestrians, cyclists and
animals.
Active: when the lights are switched on.
Cornering light function
The cornering light function improves the illu-
mination of the road over a wide angle in the
direction you are turning, enabling better visi-
bility in tight bends, for example. It can only be
activated when the low-beam headlamps are
switched on.
Active:
Rif you are driving at speeds below 25 mph
(40 km/h) and switch on the turn signal or
turn the steering wheel
Rif you are driving at speeds between 25 mph
(40 km/h) and 45 mph (70 km/h) and turn
the steering wheel
The cornering lamp may remain lit for a short
time, but is automatically switched off after no
more than three minutes.
Highway mode
Highway mode increases the range of the beam.
Active: if you are driving at a speed above
110 km/h and do not make any large steering
movements for at least 1,000 m or if you are
driving at a speed above 130 km/h.
114Exterior lighting
Lights and windshield wipers

Problems with fuel and the fuel tank
ProblemPossible causes/consequences andMSolutions
Fuel is leaking from the
vehicle.GWARNING
The fuel line or the fuel tank is faulty.
Risk of explosion or fire.
XApply the electric parking brake.
XSwitch off the engine.
XRemove the SmartKey from the ignition lock.
or, on vehicles with KEYLESS‑GO:
XOpen the driver's door.
The on-board electronics now have status 0. This is the same as the
SmartKey having been removed.
XDo not restart the engine under any circumstances.
XConsult a qualified specialist workshop.
The engine does not
start.The fuel tank of a vehicle with a diesel engine has been run completely
dry.
XRefuel the vehicle with at least 5.3 US qt (5 liters) of diesel.
XTurn the ignition on for approximately ten seconds (Ypage 138).
XStart the engine continuously for up to ten seconds until it runs
smoothly.
If the engine does not start:
XTurn the ignition on again for approximately ten seconds
(Ypage 138).
XStart the engine again continuously for up to ten seconds until it
runs smoothly.
If the engine does not start after three attempts:
XConsult a qualified specialist workshop.
The fuel filler flap cannot
be opened.The fuel filler flap is not unlocked.
XUnlock the vehicle (Ypage 74).
The SmartKey battery is discharged or nearly discharged.
XUnlock the vehicle using the mechanical key (Ypage 76).
The fuel filler flap is unlocked, but the opening mechanism is jammed.
XConsult a qualified specialist workshop.
DEF (BlueTEC vehicles only)
General notes
To function properly, BlueTEC exhaust gas after-
treatment must be operated with the reducing
agent DEF. Adding DEF is one of the tasks per-
formed during maintenance. Under normal operating conditions, a tank of DEF lasts until
the next service due date.
When the supply of DEF is almost used up, the
Check Additive See Operator's Manualmessage is shown in the multifunction display.
If you drive the vehicle faster than 10 mph
(16 km/h), the
Check Additive See Opera‐
156Refueling
Driving and parking

tor's Manualmessage goes out after approx-
imately one minute.
When the DEF supply drops to a minimum, the
Remaining Starts: 16
message is shown in
the multifunction display.
If the Remaining Starts: 16
message
appears in the multifunction display, you can
start the engine another 16 times. If DEF is not
refilled, you will subsequently be unable to
start the engine.
XAdd at least 1 gal (3.8 l)of DEF.
XSwitch on the ignition for at least 60 seconds.
XStart the engine.
iHave the DEF tank refilled at a qualified spe-
cialist workshop.
Use the special DEF refill bottle when adding
DEF between maintenance intervals. You can
obtain further information from an authorized
Mercedes-Benz Center or, if necessary, contact
Roadside Assistance (
Ypage 27).
If the outside temperature is below 12 ‡(Ò11 †)
it may be difficult to top up. If DEF is frozen and
there is an active warning indicator, it may not
be possible to add DEF. Park the vehicle in a
warmer place, e.g. in a garage, until DEF has
become fluid again. It will then be possible to
add DEF again. Alternatively, have the DEF tank
refilled at a qualified specialist workshop.
Further information about BlueTEC exhaust gas aftertreatment and DEF is available at any
authorized Mercedes-Benz Center.
Important safety notes
DEF is a water-soluble fluid for the exhaust gas
aftertreatment of diesel engines. It is:
Rnot poisonous
Rcolorless and odorless
Rnot flammable
When you open the DEF container, small
amounts of ammonia vapor may be released.
Ammonia vapors have a pungent odor and are
particularly irritating to the skin, to mucous
membranes and to the eyes. You may experi-
ence a burning sensation in your eyes, nose and
throat. Coughing and watering of the eyes are
possible.
Do not inhale ammonia vapors. Fill the DEF tank
only in well-ventilated areas. DEF must not come into contact with your skin,
eyes or clothing and must not be swallowed.
Keep DEF away from children.
If you or other persons come into contact with
DEF, observe the following:
RRinse DEF from your skin immediately with
soap and water.
RIf DEF comes into contact with your eyes,
immediately rinse them thoroughly with clean
water. Seek medical assistance without
delay.
RIf DEF has been swallowed, rinse your mouth
out immediately. Drink plenty of water. Seek
medical assistance without delay.
RChange out of clothing contaminated with
DEF immediately.
!Only use DEF in accordance with
ISO 22241. Do not mix any additives with
DEF, and do not dilute DEF with water. This
may destroy the BlueTEC exhaust gas after-
treatment system.
!The vehicle must be parked on level ground
to fill the DEF tank. The DEF tank can only be
filled as intended with the vehicle parked on a
level surface. This avoids false level readings.
Filling the tank is not permitted if the vehicle
is not parked on a level surface. There is a
danger of overfil
ling, which could result in
damage to components of the BlueTEC
exhaust gas aftertreatment.
!Rinse surfaces that have come into contact
with DEF immediately with water or remove
DEF using a damp cloth and cold water. If the
DEF has already crystallized, use a sponge
and cold water to clean it. DEF residues crys-
tallize after time and contaminate the affec-
ted surfaces.
!DEF is not a fuel additive and must not be
added to the fuel tank. If DEF is added to the
fuel tank, this can lead to engine damage.
For further information on DEF, see
(
Ypage 381).
Refueling157
Driving and parking
Z

Opening/closing the DEF filler cap
The fuel filler flap is unlocked or locked auto-
matically when you open or close the vehicle
with the SmartKey or with KEYLESS-GO.
XTo open:switch the ignition off.
XPress the fuel filler flap in the direction of
arrow:.
The fuel filler flap swings up.
XTurn blue DEF fuel filler cap ;counter-clock-
wise and remove it.
DEF filler cap ;is secured with a plastic
strip.
XTo close: place DEF filler cap ;on the filler
neck and turn it clockwise.
XTo close the fuel filler flap, press it in the
direction of arrow :.
XDrive faster than 10 mph (16 km/h).
TheCheck Additive See Operator's
Manualmessage goes out after approx-
imately one minute.
iIf the Check Additive See Operator'sManualmessage continues to be shown in
the multifunction display, you must add more
DEF.
DEF refill canisters
!Do not screw the disposable hose on too
tight. The disposable hose could otherwise be damaged and DEF may leak out.
XUnscrew the cap from the opening on top of
DEF refill canister ;.
XPlace disposable hose :on the opening of
DEF refill canister ;and screw it on clock-
wise until hand-tight.
Disposable hose :remains closed until you
fasten disposable hose :to the DEF filler
neck of the vehicle.
XPlace disposable hose :on the filler neck on
the vehicle and screw it on clockwise until
hand-tight. When you feel resistance, dispos-
able hose :is sufficiently secured.
XLift up and tip DEF refill canister ;.
Filling stops when the DEF tank is completely
filled. Do not fill the DEF tank any further. DEF
refill canister ;can be removed when it has
been only partially emptied.
XTurn disposable hose :on the filler neck of
the vehicle counter-clockwise and remove it.
XTurn disposable hose :on the opening of
DEF refill canister ;counter-clockwise and
remove it.
XReseal DEF refill canister ;with the cap.
DEF refill canisters are available at many gas
stations or at a qualified specialist workshop.
DEF refill canisters are often sold with a filler
hose. A filler hose that does not exactly fit the
vehicle's DEF tank offers no protection against
158Refueling
Driving and parking

RLOW RANGE offroad gear (vehicles with the
Offroad Engineering package) (Ypage 219)
RDifferential lock (vehicles with the Off-Road
Engineering package) (Ypage 218)
ROff-road ABS (Ypage 64)
ROff-road 4ETS (Ypage 67)
ROff-road ESP®(Ypage 68)
RAIRMATIC package (vehicle level)
(Ypage 186)
RDSR (Downhill Speed Regulation)
(Ypage 216)
Observe the following notes:
RStop the vehicle before starting to drive along
an off-road route. If necessary, select the off-
road program (
Ypage 218) or shift to the
LOW RANGE off-road gear (Ypage 219).
RSelect a vehicle level that is suitable for the
terrain. To avoid damaging the vehicle, make
sure there is always sufficient ground clear-
ance.
RCheck that items of luggage and loads are
stowed safely and are well secured
(
Ypage 299).
RAlways keep the engine running and in gear
when driving on a downhill gradient. Activate
DSR (
Ypage 216).
RAlways keep the engine running and in gear
when driving on a slope.
RAdapt your speed to the terrain. The rougher,
steeper or more ruts on the terrain, the slower
your speed should be.
RDo not jump with the vehicle as this will inter- rupt the vehicle's propulsion.
RDrive with extreme care on unfamiliar off-road
routes where visibility is poor. For safety rea-
sons, get out of the vehicle first and survey
the off-road route.
RLook out for obstacles, such as rocks, holes,
tree stumps and furrows.
RAlways keep the doors, the tailgate, the side
windows and the sliding sunroof closed whilethe vehicle is in motion.
RDo not shift the automatic transmission to
transmission position N.
RObserve the notes on off-road fording
(Ypage 167).
iDo not use the HOLD function when driving
off-road, on steep uphill or downhill gradients
or on slippery or loose surfaces. The HOLD function cannot hold the vehicle on such sur-
faces.
Checklist before driving off-road
!If the engine oil warning lamp lights up while
the vehicle is in motion, stop the vehicle in a
safe place as soon as possible. Check the
engine oil level. The engine oil warning lamp
warning must not be ignored. Continuing the
journey while the symbol is displayed could
lead to engine damage.
XEngine oil level: check the engine oil level
and add oil if necessary.
When driving on steep gradients, the engine
oil level must be sufficiently high to ensure a
correct oil supply in the vehicle.
XDEF tank (BlueTEC vehicles): check the
level and add if necessary (Ypage 156).
XTire-changing tool kit: check that the jack is
working and make sure you have the lug
wrench, a robust tow cable and a folding
spade in the vehicle.
XWheels and tires: check the tire tread depth
and tire pressure.
XCheck for damage and remove any foreign
objects, e.g. small stones, from the wheels/
tires.
XReplace any missing valve caps.
XReplace dented or damaged wheels.
XRims: dented or bent rims can result in a loss
of tire pressure and damage the tire bead.
Before driving off-road, check the wheels and replace them if necessary.
Checklist after driving off-road
!If you detect damage to the vehicle after
driving off-road, have the vehicle checked
immediately at a qualified specialist work-
shop.
Driving over rough terrain places greater
demands on your vehicle than driving on normal
roads. After driving off-road, check the vehicle.
This allows you to detect damage promptly and
reduce the risk of an accident to yourself and
other road users.
XIf the Offroad orOffroad Plus drive program
is selected: select the Individual,Sport,
Driving tips169
Driving and parking
Z

XTo select a preset list or station list:press
and briefly hold the 9or: button until
the preset list or station list in the desired
frequency range is shown in the multifunction display.
XTo select a station: briefly press9
or :.
iSIRIUS XM satellite radio functions like a
normal radio.
For more information on radio operation, see
"Satellite radio" in the separate operating
instructions.
Operating an audio player or audio
media
Audio data from various audio devices or media
can be played, depending on the equipment
installed in the vehicle.
XSwitch on the multimedia system and select
audio CD or MP3 mode; see the separate
operating instructions.
XPress the =or; button on the steering
wheel to select the Audiomenu.
XTo select the next/previous track: briefly
press the 9or: button.
XTo select a track from the track list (rapid
scrolling): press and hold the 9or:
button until desired track :has been
reached.
If you press and hold 9or:, the rapid
scrolling speed is increased. Not all audio
drives or data carriers support this function.
If track information is stored on the audio device
or medium, the multifunction display will show
the number and title of the track. The current
track does not appear in audio AUX mode
( Aux iliary audio mode: external audio source
connected).
Video DVD operation
XSwitch on the multimedia system and select
video DVD; see the separate operating
instructions.
XPress the =or; button on the steering
wheel to select the Audiomenu.
XTo select the next or previous scene:
briefly press the9or: button.
XTo select a scene from the scene list
(rapid scrolling): press and hold the 9
or : button until desired scene :has
been reached.
Telephone menu
Introduction
GWARNING
If you operate information systems and com-
munication equipment integrated in the vehi-
cle while driving, you will be distracted from
traffic conditions. You could also lose control
of the vehicle. There is a risk of an accident.
Only operate the equipment when the traffic
situation permits. If you are not sure that this
is possible, park the vehicle paying attention
to traffic conditions and operate the equip-
ment when the vehicle is stationary.
When telephoning, you must observe the legal
requirements for the country in which you are
currently driving.
XSwitch on the mobile phone (see the manu-
facturer’s operating instructions).
XSwitch on the multimedia system (see sepa-
rate operating instructions).
XEstablish a Bluetooth®connection to the mul-
timedia system; see the separate operating
instructions.
XPress the =or; button on the steering
wheel to select the Telmenu.
Menus and submenus235
On-board computer and displays
Z