light MERCEDES-BENZ GLS SUV 2016 Service Manual

In such cases, Adaptive Brake Assist can:
R intervene unnecessarily
R not intervene
There is a risk of an accident.
Always pay careful attention to the traffic sit- uation and be ready to brake. Terminate the
intervention in a non-critical driving situation. G
WARNING
Adaptive Brake Assist does not react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R when cornering
As a result, the Adaptive Brake Assist may not intervene in all critical conditions. There is a
risk of an accident.
Always pay careful attention to the traffic sit- uation and be ready to brake.
Due to the nature of the system, particularly
complicated but non-critical driving conditions
may also cause Brake Assist to intervene.
If Adaptive Brake Assist is not available due to a malfunctioning radar sensor system, the brake
system remains available with full brake boost-
ing effect and BAS. Adaptive brake lights
The adaptive brake lights warn following traffic
in an emergency braking situation by:
R flashing brake lamps
R switching on the hazard warning lamps
If you brake sharply from a speed of more than
50 km/h or are assisted by the Brake Assist, the
brake lamps flash rapidly. In this way, traffic
travelling behind you is warned in an even more
noticeable manner.
If you brake sharply from a speed of more than
70 km/h to a standstill, the hazard warning
lamps are activated automatically. If the brakes are applied again, the brake lamps light up con-
tinuously. The hazard warning lamps switch off
automatically if you travel faster than 10 km/h. You can also switch off the hazard warning lamps using the hazard warning button
(Y
page 122). ESP
®
(Electronic Stability Program)
General notes i
Observe the "Important safety notes" sec-
tion (Y page 68).
ESP ®
monitors driving stability and traction, i.e.
power transmission between the tyres and the
road surface.
If ESP ®
detects that the vehicle is deviating from
the direction desired by the driver, one or more
wheels are braked to stabilise the vehicle. The
engine output is also modified to keep the vehi- cle on the desired course within physical limits.
ESP ®
assists the driver when pulling away on
wet or slippery roads. ESP ®
can also stabilise
the vehicle during braking.
4ETS (Electronic Traction System) 4ETS traction control is part of ESP
®
.
Traction control brakes the drive wheels indi-
vidually if they spin. This enables you to pull
away and accelerate on slippery surfaces, for
example if the road surface is slippery on one
side. In addition, more drive torque is transfer-
red to the wheel or wheels with traction.
Traction control remains active if you deactivate
ESP ®
.
In appropriate driving situations, activate the
off-road programs:
X Vehicles without the Off-Road Engineering
package (Y page 228)
X Vehicles with the Off-Road Engineering pack-
age (Y page 229)
Off-road 4ETS (Electronic Traction Sys-
tem) An ETS system specifically suited to off-road
terrain is activated automatically once an off-
road program is activated:
R Vehicles without the Off-Road Engineering
package (Y page 228)
R Vehicles with the Off-Road Engineering pack-
age (Y page 229) 72
Driving safety systemsSafety

Important safety notes
G
WARNING
If ESP ®
is malfunctioning, ESP ®
is unable to
stabilise the vehicle. In addition, other driving
safety systems are switched off. This increa-
ses the risk of skidding and an accident.
Drive on carefully. Have ESP ®
checked at a
qualified specialist workshop.
! Only operate the vehicle for a maximum of
ten seconds on a brake dynamometer. Switch off the ignition.
Application of the brakes by ESP ®
may oth-
erwise destroy the brake system.
! A function or performance test should only
be carried out on a twin-axle dynamometer.
Before you operate the vehicle on such a
dynamometer, please consult a qualified
workshop. You could otherwise damage the
drive train or the brake system.
When ESP ®
is deactivated, the åESP®
OFF
warning lamp lights up continuously.
If the ÷ warning lamp and the åwarning
lamp are lit continuously, ESP ®
is not available
due to a malfunction.
Observe the information on warning lamps
(Y page 295) and display messages which may
be shown in the instrument cluster
(Y page 259).
i Only use wheels with the recommended tyre
sizes. Only then will ESP ®
function properly.
Characteristics of ESP ®General notes
If the ÷ ESP warning lamp goes out before
beginning the journey, ESP ®
is automatically
active.
If ESP ®
intervenes, the ÷ESP®
warning lamp
flashes in the instrument cluster.
If ESP ®
intervenes:
X Do not deactivate ESP ®
under any circum-
stances.
X When pulling away, only depress the acceler-
ator pedal as far as is necessary.
X Adapt your driving style to suit the prevailing
road and weather conditions. ECO start/stop function
The ECO start/stop function switches the
engine off automatically if the vehicle stops
moving. When pulling away again, the engine
starts automatically. ESP ®
remains in its previ-
ously selected status, e.g. if ESP ®
was deacti-
vated before the engine was automatically
switched off.
Deactivating/activating ESP ® Important safety notes
i Observe the "Important safety notes" sec-
tion (Y page 68).
You can select between the following ESP ®
sta-
tuses:
R ESP ®
is activated
R ESP ®
is deactivated G
WARNING
If you deactivate ESP ®
, ESP ®
no longer sta-
bilises the vehicle. There is an increased risk
of skidding and an accident.
Only deactivate ESP ®
in the situations descri-
bed in the following.
In the following situations, it may be better to
deactivate ESP ®
:
R when snow chains are used
R in deep snow
R on sand or gravel
Spinning the wheels results in a cutting action,
which enhances traction.
i Activate ESP ®
as soon as the situations
described above no longer apply. ESP ®
will
otherwise not stabilise the vehicle if the vehi-
cle starts to skid or a wheel starts to spin. Driving safety systems
73Safety Z

Deactivating/activating ESP
®X
To deactivate: press button:.
The å ESP®
OFF warning lamp on the
instrument cluster lights up.
X To activate: press button :.
The å ESP®
OFF warning lamp on the
instrument cluster goes out.
Characteristics when ESP ®
is deactivated
If ESP ®
is deactivated and one or more wheels
start to spin, the ÷ESP®
warning lamp in the
instrument cluster flashes. In such situations,
ESP ®
will not stabilise the vehicle.
If you deactivate ESP ®
:
R ESP ®
no longer improves driving stability
R engine torque is no longer limited and the
drive wheels may start to spin
R traction control is still activated
R Active Brake Assist is no longer available; it is
not activated even if you brake firmly with
assistance from ESP ®
R PRE-SAFE ®
is not available; it is not activated
even if you brake firmly with assistance from
ESP ®
R Active Brake Assist with cross-traffic function
is no longer available; it is not activated even
if you brake firmly with assistance from ESP ®
R ESP ®
continues to provide assistance when
the brakes are firmly applied Off-road ESP
®
(vehicles with Off-Road
Engineering package) An ESP
®
system specifically suited to off-road
terrain is activated automatically once an off-
road program is activated.
R Vehicles without the Off-Road Engineering
package (Y page 228)
R Vehicles with the Off-Road Engineering pack-
age (Y page 229)
Off-road ESP ®
intervenes with a delay if there is
oversteering or understeering, thus improving
traction.
ESP ®
trailer stabilisation General notes
ESP ®
trailer stabilisation is not available in
Mercedes-AMG vehicles.
If your vehicle/trailer combination begins to
lurch, ESP ®
assists you in this situation. ESP ®
slows the vehicle down by braking and limiting
the engine output until the vehicle/trailer com- bination has stabilised.
Important safety notes G
WARNING
If road and weather conditions are poor,
trailer stabilisation will not be able to prevent the vehicle/trailer combination from swerv-
ing. Trailers with a high centre of gravity can
tip over before ESP ®
can detect this. There is
a risk of an accident.
Always adapt your driving style to the prevail-
ing road and weather conditions.
If your vehicle/trailer combination begins to
lurch, you can only stabilise the vehicle/trailer
combination by depressing the brake firmly.
Trailer stabilisation is active above speeds of
about 60 km/h.
ESP ®
trailer stabilisation does not work if ESP ®
is deactivated or disabled because of a malfunc- tion. 74
Driving safety syste
msSafety

radar sensors checked at a qualified specialist
workshop. This also applies to collisions at low
speeds where no damage to the front of the
vehicle is visible.
Following damage to the windscreen, have the
configuration and operation of the camera sys-
tem checked at a qualified specialist workshop.
Function X
To activate or deactivate: activate or deac-
tivate Active Brake Assist with cross-traffic
function using the on-board computer
(Y page 250).
If the Active Brake Assist with cross-traffic
function is deactivated, the æsymbol
appears in the multifunction display.
If you have activated DSR (Y page 227), the
Active Brake Assist with cross-traffic function is
deactivated.
This function issues a warning:
R at a speed of approximately 30 km/h or
higher, the distance maintained to the vehicle
travelling in front is insufficient for several
seconds.
The · distance warning lamp then lights
up in the instrument cluster.
R at a speed of approximately 7 km/h or more,
you rapidly approach a vehicle in front or a
pedestrian
An intermittent warning tone will then sound
and the ·distance warning lamp will light
up on the instrument cluster.
X Brake immediately to defuse the situation.
or
X Take evasive action provided it is safe to do
so.
Active Brake Assist with cross-traffic function
can also brake the vehicle automatically under
the following conditions:
R the driver and front passenger have their seat
belts fastened
and
R the vehicle speed is between approximately
7 km/h and 200 km/h Up to a speed of approximately 70 km/h, Active
Brake Assist with cross-traffic function may
react to:
R stationary objects in the path of your vehicle,
such as stopped or parked vehicles
R pedestrians in the path of your vehicle
i If an increased danger of collision exists,
preventative passenger protection measures
(PRE-SAFE ®
) are triggered (Y page 56).
If the risk of collision remains and you do not
brake, take evasive action or accelerate quickly,
the vehicle may perform automatic braking up to
the point of a full brake application. An auto-
matic full brake application is not performed
until immediately prior to an imminent accident.
If you apply the brake yourself in a critical sit-
uation or during autonomous braking, braking
assistance is provided according to the situa-
tion. If necessary, this increases the brake pres-
sure up to full brake application.
To avoid a collision, Active Brake Assist with
cross-traffic function calculates the brake force
necessary if:
R you approach an obstacle and
R Active Brake Assist with cross-traffic function
has detected a risk of a collision
When driving at a speed under30 km/h: if
you depress the brake pedal, Active Brake
Assist with cross-traffic function is activated.
Braking assistance from Active Brake Assist
with cross-traffic function is carried out at the
last possible moment.
When driving at a speed above30 km/h: if
you depress the brake pedal sharply, Active
Brake Assist with cross-traffic function auto-
matically increases the brake pressure to a
degree suited to the traffic situation.
Active Brake Assist with cross-traffic function
provides braking assistance in hazardous situa-
tions with vehicles in front within a speed range
between 7 km/h and 250 km/h. Driving safety systems
77Safety Z

A visual and audible alarm is triggered if the
alarm system is primed and you open:
R a door
R the vehicle with the emergency key element
R the tailgate
R the bonnet
X To stop the alarm with the key: press the
% or& button on the key.
The alarm stops.
or X Insert the key into the ignition lock.
The alarm stops.
X To stop the alarm using KEYLESS-GO:
grasp the outside door handle. The key must
be outside the vehicle.
The alarm stops.
or X Press the Start/Stop button on the dash-
board. The key must be inside the vehicle.
The alarm stops.
The alarm does not switch off, even if you close the open door that has triggered it, for example. Tow-away protection
Function An audible and visual alarm is triggered if your
vehicle's angle of inclination is altered while
tow-away protection is primed. This can occur if
the vehicle is jacked up on one side, for exam-
ple.
Priming X
Make sure that:
R the doors are closed
R the tailgate is closed
Only then is tow-away protection primed.
X Lock the vehicle with the key or KEYLESS-GO.
Tow-away protection is primed after approx-
imately 60 second s. Switching off X
To switch off with the key: unlock the vehi-
cle using the key.
or X Insert the key into the ignition lock.
Tow-away protection is switched off automat-
ically.
X To switch off with KEYLESS-GO: unlock the
vehicle using KEYLESS-GO.
or X Press the Start/Stop button on the dash-
board. The key must be inside the vehicle.
Tow-away protection is switched off automat-
ically.
Deactivating X
Remove the key from the ignition lock.
X Press button :.
Indicator lamp ;lights up briefly.
X Lock the vehicle with the key or KEYLESS-GO.
Tow-away protection is deactivated.
Tow-away protection remains deactivated until:
R the vehicle is unlocked again and
R a door is opened and closed again and
R the vehicle is locked again
To prevent a false alarm, deactivate tow-away
protection if you lock your vehicle and it:
R is being transported
R is being loaded onto a ferry or car transporter,
for example
R is parked on a movable surface, e.g. in a split-
level garage Protection against theft
79Safety Z

If you do not open the vehicle within approx-
imately 40 seconds of unlocking:
R the vehicle locks again
R protection against theft is reactivated
X To lock centrally: press the&button.
The key centrally locks and unlocks the follow-
ing components:
R the doors
R the tailgate
R the fuel filler flap
During unlocking, the turn signals flash once.
During locking, they flash three times.
You can also set an audible signal to confirm
that the vehicle has been locked. The audible
signal can be activated or deactivated using the on-board computer (Y page 253).
Only when all the components have been locked is the visual or audible locking confirmation
issued.
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 theF
button until the tailgate opens.
Vehicles with KEYLESS-GO: X To close the tailgate automatically from
outside the vehicle: if the key is located in
the immediate vicinity of the vehicle, press
the F button on the key.
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 150).
Locking and unlocking centrally You can start, lock or unlock the vehicle using
KEYLESS-GO. To do this, you need to carry the
key with you. You can combine the KEYLESS-GO functions with the functions of a conventional
key. Unlock the vehicle by using KEYLESS-GO, for instance, and lock it using the
&button
on the key.
The driver's door and the door at which the han- dle is used must both be closed. The key must be
outside the vehicle. When locking or unlocking
with KEYLESS-GO, the distance between the key and the corresponding door handle must not be greater than 1 m.
KEYLESS-GO checks whether a valid key is in
the vehicle by periodically establishing a radio
connection between the vehicle and the key.
This happens:
R during engine start
R during 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 :
or ;.
Make sure that you do not touch the inner
surface of the door handle.
X Convenience closing feature: touch
recessed sensor surface ;for an extended
period.
Further information on the convenience closing
feature (Y page 95).
If you pull on the handle of the tailgate, only the luggage compartment of the vehicle is
unlocked.
Deactivating and activating If you do not intend to use a key for an extended
period of time, you can deactivate the KEYLESS-
GO function of the key. The key will then use very
little power, thereby conserving battery power.
For the purposes of activation or deactivation,
the vehicle does not have to be nearby. 82
KeyOpening and closing

X
To deactivate: press the&button on the
key twice in rapid succession.
The battery check lamp of the key flashes
twice briefly and lights up once, then KEY-
LESS-GO is deactivated (Y page 84).
X To activate: press any button on the key.
or X Insert the key into the ignition lock.
KEYLESS-GO and all its associated features
are available again. KEYLESS-GO start function
General notes Bear in mind that the engine can be started by
any of the vehicle occupants if there is a key in
the vehicle (Y page 150). Changing the settings of the locking
system
You can change the settings of the locking sys-
tem. This means that only the driver's door and
the fuel filler flap are unlocked when the vehicle is unlocked. This is useful if you frequently travel
alone.
X To change the setting: press and hold down
the % and& buttons simultaneously
for about six seconds until the battery indica-
tor lamp flashes twice (Y page 84).
If the setting of the locking system is changed
within the signal range of the vehicle, pressing
the & or% button:
R locks or
R unlocks the vehicle
The key now functions as follows:
X To unlock: press the%button once.
X To unlock centrally: press the%button
twice.
X To lock centrally: press the&button. The KEYLESS-GO function is changed as fol-
lows:
X
To unlock the driver's door: touch the inner
surface of the door handle on the driver's
door.
X To unlock centrally: touch the inner surface
of the door handle on the front-passenger
door or the rear door.
X To lock centrally: touch the outer sensor
surface on one of the door handles
(Y page 82).
X To restore the factory settings: press and
hold down the %and& buttons simul-
taneously for approximately six seconds until the battery check lamp flashes twice
(Y page 84). Emergency key element
General notes If the vehicle can no longer be locked or
unlocked with the key or with KEYLESS-GO, use
the emergency key element.
If you use the emergency key element to unlock
and open the driver's door, the anti-theft alarm
system will be triggered. Switch off the alarm
(Y page 78).
If you unlock the vehicle using the emergency
key element, the fuel filler flap will not be
unlocked automatically.
X To unlock the fuel filler flap: insert the key
into the ignition lock.
Removing the emergency key element Key
83Opening and closing Z

X
Push release catch :in the direction of the
arrow and, at the same time, remove emer-
gency key element ;from the key.
Further information about: R Unlocking the driver's door (Y page 89)
R unlocking the luggage compartment
(Y page 93)
R Locking the vehicle (Y page 89)
Inserting the emergency key element X
Push emergency key element ;completely
into the key until it engages and release
catch :is back in its basic position. Battery of the key
Important safety notes G
WARNING
Batteries contain toxic and corrosive substan- ces. If batteries are swallowed, it can result in
severe health problems. There is a risk of fatal injury.
Keep batteries out of the reach of children. If
a battery is swallowed, seek medical attention immediately. H
Environmental note Batteries contain pollutants.
It is illegal to dispose of them with the household rubbish.
They must be collected sep-
arately and disposed of in anenvironmentally responsible
recycling system. Dispose of batteries in an
environmentally responsible
manner. Take discharged
batteries to a qualified spe-
cialist workshop or to a col-
lection point for used batter-
ies.
Mercedes-Benz recommends that you have the
batteries replaced at a qualified specialist work- shop. Checking the battery
X
Press the &or% button.
The battery is OK if battery check lamp :
lights up briefly.
The battery is discharged if battery check
lamp :does not light up briefly.
X Replace the battery (Y page 84).
If the key battery is checked within the signal
reception range of the vehicle, pressing the
& or% button:
R locks or
R unlocks the vehicle
i You can obtain a battery from any qualified
specialist workshop.
Replacing the battery You require a CR 2025 3 V cell battery.
X Take the emergency key element out of the
key (Y page 83). X
Press emergency key element ;into the
opening in the key in the direction of the arrow
until battery compartment cover :opens.
When doing so, do not hold battery compart-
ment cover :shut.
X Remove battery compartment cover :.84
KeyOpening and closing

Problem
Possible causes/consequences and
M
MSolutions There is interference from a powerful source of radio waves.
X Unlock (Y page 89) or lock (Y page 89) the vehicle using the
emergency key element. There is a fault with KEYLESS-GO.
X Lock/unlock the vehicle using the remote control function of the
key.
X Have the vehicle and key checked at a qualified specialist work-
shop.
If the vehicle cannot be locked/unlocked even using the remote con-
trol function:
X Unlock (Y page 89) or lock (Y page 89) the vehicle using the
emergency key element.
X Have the vehicle and key checked at a qualified specialist work-
shop. The engine cannot be
started using the 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 353).
or X Jump-start the vehicle (Y page 354).
or X Consult a qualified specialist workshop. The engine cannot be
started using the Start/
Stop button. The key is in
the vehicle. The vehicle is locked.
X Unlock the vehicle and try to start the vehicle again. The key battery is discharged or nearly discharged.
X Check the key battery (Y page 84) and replace it if necessary
(Y page 84).
If this does not work: X Start your vehicle with the key in the ignition lock. There is interference from a powerful source of radio waves.
X Start your vehicle with the key in the ignition lock. You have lost a key. X
Have the key 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 emer-
gency key element. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the locks changed as well. 86
KeyOpening and closing

X
To power close a door: push the door into
the lock up to the first detent position.
Power closing will pull the door fully closed.
X To power close the tailgate: lightly press
the tailgate downwards.
Power closing will pull the tailgate fully
closed. Unlocking/locking the driver's door
using the emergency key element
i In order to lock all of the vehicle's locks,
begin by pressing the button for locking the
vehicle from the inside while the driver's door
is open. Then proceed to lock the driver's
door using the emergency key element. X
Insert the emergency key element into the
lock of the driver's door as far as it will go.
X To unlock: turn the emergency key element
anti-clockwise to position 1.
X To lock: turn the emergency key element
clockwise as far as it will go to position 1.
Right-hand-drive vehicles: turn the emer-
gency key element in the opposite direction
respectively.
If you use the emergency key element to unlock
and open the driver's door, the anti-theft alarm
system will be triggered. Switch off the alarm
(Y page 78).
If you lock the vehicle as described above, the
fuel filler flap is not locked. The anti-theft alarm
system is not primed. Luggage compartment
Important safety notes
G
WARNING
Combustion engines emit poisonous exhaust
gases such as carbon monoxide. If the tailgate is open when the engine is running, particu-
larly if the vehicle is moving, exhaust fumes
could enter the passenger compartment.
There is a risk of poisoning.
Turn off the engine before opening the tail-
gate. Never drive with the tailgate open. G
WARNING
If objects, luggage or loads are not secured or not secured sufficiently, they could slip, tip
over or be flung around and thereby hit vehicle
occupants. There is a risk of injury, especially when braking or abruptly changing directions.
Always store objects so that they cannot be
flung around. Secure objects, luggage or
loads against slipping or tipping before the
journey.
! The tailgate swings upwards and to the rear
when opened. Therefore, make sure that
there is sufficient clearance above and behind
the tailgate.
The opening dimensions of the tailgate can be
found in the "Vehicle data" section
(Y page 387).
Stow luggage or loads preferably in the luggage
compartment. Observe the loading guidelines
(Y page 312).
Do not leave the key in the luggage compart-
ment. If you do so, you could lock yourself out.
You can:
R close the tailgate manually from outside
R open and close the tailgate automatically
from outside
R open and close the tailgate automatically
from inside
R limit the opening angle of the tailgate
R unlock the tailgate from inside with the emer-
gency release Luggage compartment
89Opening and closing Z