2018 MERCEDES-BENZ GLS warning light

Course-correcting brake application If Active Blind Spot Assist detects a risk of a lat-
eral collision in the monitoring range, a course-
correcting brake application is carried out. This
is meant to assist you in avoiding a collision.
G WARNING
A course-correcting brake application cannot
always prevent a collision. There is a risk of an
accident.
Always steer, brake or accelerate yourself,
especially if Active Blind Spot Assist warns
you or makes a course-correcting brake appli-
cation. Always maintain a safe distance at the
sides.
If a course-correcting brake application occurs,
red warning lamp C flashes in the exterior mir-
ror and a double warning tone sounds. In addi-
tion, a display underlining the danger of a side
collision appears in the multifunction display.
In very rare cases, the system may make an
inappropriate brake application. A course-cor-
recting brake application may be interrupted at
any time by countersteering slightly or acceler-
ating.
The course-correcting brake application is avail-
able in the speed range between 20 mph
(30 km/h) and 120 mph (20 0 km/ h) .
Either no braking application, or a course-cor-
recting brake application adapted to the driving
situation occurs if: R
there are vehicles or obstacles, e.g. crash
barriers, located on both sides of your vehicle. R
a vehicle approaches you too closely at the
side. R
you have adopted a sporty driving style with
high cornering speeds. R
you clearly brake or accelerate. R
a driving safety system intervenes, e.g. ESP ®
or PRE-SAFE ®
Brake.R
ESP ®
is switched off.R
the offroad program is activated (vehicles
without the Offroad Engineering package). R
the Offroad or Offroad Plus drive program is
activated (vehicles with the Off-Road Engi-
neering package). R
the LOW RANGE offroad gear is activated
(vehicles with the Offroad Engineering pack-
age). R
a loss of tire pressure or a defective tire is
detected.
Switching on Active Blind Spot Assist X
Make sure that Active Blind Spot Assist
( Y
page 242) is activated in the on-board
computer. X
Turn the SmartKey to position H in the igni-
tion lock.
Warning lamps C in the exterior mirrors light
up red for approximately 1.5 seconds an d
then turn yellow.
Towing a trailer When you attach a trailer, make sure you have
correctly established the electrical connection.
This can be accomplished by checking the trailer
lighting. Active Blind Spot Assist is then deacti-
vated. The indicator lamp lights up yellow in the
exterior mirrors and the Active Blind Spot
Asst. Not Available When Towing a
Trailer See Operator's Manual message
appears in the multifunction display.
Active Lane Keeping Assist
General notes
Active Lane Keeping Assist monitors the area in
front of your vehicle by means of multifunction
camera C at the top of the windshield. Various
different areas to the front, rear and side of your
vehicle are also monitored with the aid of the
radar sensor system. Active Lane Keeping
Assist detects lane markings on the road and
can warn you before you leave your lane unin-
tentionally. If you do not react to the warning, aDriving system s 215
Dr ivi ng an d parking Z

ing over a solid lane marking. There is a risk of
an accident.
An inappropriate brake application may be
interrupted at any time if you steer slightly in
the opposite direction. Always make sure that
there is sufficient distance on the side for
other traffic or obstacles.
If you leave your lane, under certain circumstan-
ces the vehicle will brake briefly on one side.
This is meant to assist you in bringing the vehicle
back to the original lane.
If a lane-correcting brake application occurs,
display C appears in the multifunction display.
A lane-correcting brake application can be made
after driving over a solid or broken lane marking.
Before this, a warning must be given by means of
intermittent vibration in the steering wheel. In
addition, a lane with lane markings on both sides
must have been detected.
In the case of a broken lane marking being
detected, a lane-correcting brake application
can only be made if a vehicle has been detected
in the adjacent lane. The following vehicles can
have an influence on brake application: oncom-
ing traffic, vehicles that are overtaking and vehi-
cles that are driving parallel to your vehicle.
i A further lane-correcting brake application
can only occur after your vehicle has returned
to the original lane.
No lane-correcting brake application occurs if: R
you clearly and actively steer, brake or accel-
erate. R
you cut the corner on a sharp bend R
you have switched on the turn signal R
a driving safety system intervenes, e.g. ESP ®
,
PRE-SAFE ®
Brake or Active Blind Spot Assist R
you have adopted a sporty driving style with
high cornering speeds or high rates of accel-
eration R
ESP ®
is switched off R
the transmission is not in position [R
on vehicles with a trailer tow hitch, the elec-
trical connection to the trailer has been cor-
rec tly est ablished R
the Off-road program is activated (vehicles
without the Off-Road Engineering package) R
the Off-road or Off-road Plus drive program is
activated (vehicles with the Off-Road Engi-
neering package) R
the LOW RANGE off-road gear is activated
(vehicles with the Off-Road Engineering pack-
age) R
an obstacle has been detected in the lane in
which you are driving R
when a loss of tire pressure or a defective tire
has been detected and displayed
There is a possibility that the Active Lane Keep-
ing Assist could misjudge the given traffic sit-
uation. An inappropriate brake application may
be interrupted at any time if you: R
steer slightly in the opposite direction R
switch on the turn signal R
clearly brake or accelerate
A lane-correcting brake application is interrup-
ted automatically if: R
a driving safety system intervenes, e.g. ESP ®
,
PRE-SAFE ®
Brake or Active Blind Spot Assist R
lane markings are no longer detected
Switching on Active Lane Keeping Assist X
Switch on Active Lane Keeping Assist using
the on-board computer; to do so, select
Standard or Adaptive ( Y
page 242).
If you drive at speeds above 40 mph
(60 km/h) and lane markings are detected,
the lines in the assistance graphic are shown
in green ( Y
page 241). Active Lane Keeping
Assist is ready for use.
If Standard is selected, no warning vibration
occurs if: R
you switch on the turn signals. In this event,
the warnings are suppressed for a certain
period of time R
a driving safety system intervenes, such as
ABS, BAS or ESP ®Driving systems 217
Driving and parking Z

When Adaptive is selected, no warning vibra-
tion occurs if: R
you switch on the turn signals. In this event,
the warnings are suppressed for a certain
period of time R
a driving safety system intervenes, e.g.
ABS, BAS or ESP ®
R
you accelerate hard, e.g. kickdown R
you brake hard R
you steer actively, e.g. swerve to avoid an
obstacle or change lanes quickly R
you cut the corner on a sharp bend
Towing a trailer When you attach a trailer, make sure you have
correctly established the electrical connection.
This can be accomplished by checking the trailer
lighting. Lane-correcting brake application does
not take place when towing a trailer. Active Lane
Keeping Assist is not activated and the lines in
the assistance graphic are gray.
Off-road driving systems
4MATIC (permanent four-wheel drive) 4MATIC ensures that all four wheels are perma-
nently driven. Together with ESP ®
and 4ETS, it
improves the traction of your vehicle whenever
a drive wheel spins due to insufficient grip.
If you fail to adapt your driving style, 4MATIC can
neither reduce the risk of accident nor override
the laws of physics. 4MATIC cannot take
account of road, weather and traffic conditions.
4MATIC is only an aid. You are responsible for
the distance to the vehicle in front, for vehicle
speed, for braking in good time and for staying in
your lane.
! Never tow the vehicle with one axle raised.
This may damage the transfer case. Damage
of this sort is not covered by the Mercedes-
Benz Limited Warranty. All wheels must
remain either on the ground or be fully raised.
Observe the instructions for towing the vehi-
cle with all wheels in full contact with the
ground.
! A function or performance test should only
be carried out on a two-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.
i In wintry driving conditions, the maximum
effect of 4MATIC can only be achieved if you
use winter tires (M+S tires), with snow chains
if necessary.
Further information about "Driving off-road"
( Y
page 170).
DSR (Downhill Speed Regulation) General notes DSR is an aid to assist you when driving down-
hill. It keeps the speed of travel at the speed
selected on the on-board computer. The steeper
the downhill gradient, the greater the DSR brak-
ing effect on the vehicle. When driving on flat
stretches of road or on an uphill gradient, the
DSR braking effect is minimal or nonexistent.
DSR controls the vehicle’s speed when it is acti-
vated and the transmission is in position D , R or
N . You can drive at a higher or a lower speed
than that set on the on-board computer at any
time by accelerating or braking.
Important safety notes
G WARNING
If the speed driven and the set speed deviate
and you activate DSR on a slippery road sur-
face, the wheels may lose traction. There is an
increased danger of skidding and accidents.
Before switching DSR on, please take into
consideration the road surface and the differ-
ence between driving speed and the set
speed.
If you fail to adapt your driving style, DSR can
neither reduce the risk of accident nor override
the laws of physics. DSR cannot take account of
road, weather and traffic conditions. DSR is only
an aid. You are responsible for the distance to
the vehicle in front, for vehicle speed, for brak-
ing in good time and for staying in your lane.
You are always responsible for keeping control
of the vehicle and for assessing whether the
downhill gradient can be managed. DSR may not
always be able to keep to the set speed, depend-
ing on road surface and tire conditions. Select a
set speed suitable for the prevailing conditions
and when necessary, apply the brakes manually.218
Driving systems
Driving and parking

multifunction display. The last active drive pro-
gram is selected again.
Selecting the Offroad program X
To select a drive program: turn DYNAMIC
SELECT controller C until indicator lamp D
lights up.
The Drive program "Offroad" Max.
speed 60 mph message appears in the mul-
tifunction display.
The vehicle is raised by +1.2 in (30 mm).
The vehicle changes from the Offroad drive pro-
gram to the Comfort drive program if you drive
faster than 70 mph (112 km/h).
The Drive more slowly message appears in
the multifunction display.
Offroad Plus drive program
C
DYNAMIC SELECT controllerD
Offroad Plus drive program indicator lamp
Select the Offroad Plus drive program for rough
terrain, e.g. for steep and/or uneven terrain or
for driving on rocky terrain.
Your vehicle has an automatically activated dif-
ferential lock for the transfer case. It controls
the balance between the front and rear axles.
The differential lock improves the vehicle's trac-
tion. 4ETS ( Y
page 70) controls the balance
between both wheels on an axle.
Selecting the Offroad Plus drive program X
To select drive program: turn DYNAMIC
SELECT controller C until indicator lamp D
lights up.
The Drive program "Offroad Plus"
Max. speed 25 mph message appears in the
multifunction display. R
The Offroad Plus program is selected and
the vehicle is raised by +1.2 in (30 mm)
compared with the Offroad drive program.R
DSR is switched on. R
The differential lock is closed.
You can select the Offroad Plus drive program at
speeds below 25 mph (40 km/h).
The Offroad Plus drive program automatically
switches to the Offroad drive program if you
drive faster than 30 mph (45 km/h). The Drive
more slowly message appears in the multi-
function display.
Further information about "Driving off-road"
( Y
page 170).
LOW RANGE off-road gear (vehicles
with the Off-Road Engineering package) Important safety notes
G WARNING
If you select the LOW RANGE off-road gear on
a slippery road surface, the wheels could lose
traction: R
if you remove your foot from the accelera-
tor pedal when driving R
if off road ABS intervenes when braking
If the wheels lose traction. the vehicle can no
longer be steered. There is an increased dan-
ger of skidding and accidents.
Never select the LOW RANGE off-road gear
when driving on slippery road surfaces.
G WARNING
If you do not wait for the transfer case gear
change process to complete, the transfer
case could remain in the neutral position. The
power transmission to the driven wheels is
then interrupted. There is a danger of the
vehicle rolling away unintentionally. There is a
risk of an accident.
Wait until the transfer case shift process is
completed.
Do not turn off the engine while changing gear
and do not shift the automatic transmission to
another position.Driving systems 221
Driving and parking Z

Important safety notes
G WARNIN G
If you operate information systems and com-
munication equipmen t integrate d in th e vehi-
cle when driving , you may be distracte d from
th e traffic situation . You could also lose con-
trol of th e vehicle. Ther e is a ris k of an acci-
dent.
Only operate this equipmen t when th e traffic
situation permits. If you are no t sur e that this
is possible , park th e vehicl e payin g attention
to traffic condition s and operate th e equip-
men t when th e vehicl e is stationary.
You must observ e th e legal requirements for th e
country in whic h you are currentl y driving when
operating th e on-board computer.
G WARNIN G
If th e instrumen t cluste r has faile d or mal-
functioned, you may no t recognize function
restriction s in systems relevan t to safety. The
operating safet y of your vehicl e may be
impaired . Ther e is a ris k of an accident.
Drive on carefully. Hav e th e vehicl e checke d
at a qualified specialist workshop immedi-
ately.
If th e operating safet y of your vehicl e is
impaired , pull ove r as soo n as it is saf e to do so.
Contac t a qualified specialist workshop.
The on-board computer only shows message s or
warning s from certain systems in th e multifunc-
tion display. You should therefor e mak e sur e
your vehicl e is operating safely at all times .
Fo r an overview, see th e instrumen t panel illus-
tration ( Y
page 37).
Displays and operation
Instrument cluster lighting
The lighting in th e instrumen t cluster, in th e dis-
plays and th e control s in th e vehicl e interior can
be adjusted usin g th e brightness control knob.
The brightness control knob is locate d on th e
botto m lef t of th e instrumen t cluste r
( Y
page 37). X
Turn th e brightness control knob clockwise or
counter-clockwise.
If you tur n th e ligh t switch to X , ` or
X , th e brightness is dependen t upon th e
brightness of th e ambien t light.
i The ligh t sensor in th e instrumen t cluste r
automatically control s th e brightness of th e
multifunction display.
In daylight, th e displays in th e instrumen t
cluste r are no t illuminated.
Speedometer with segments The segments in th e speedometer indicat e
whic h spee d range is available. R
Cruis e control activated ( Y
page 174):
The segments ligh t up from th e store d spee d
to th e maximum speed. R
Distanc e Pilot DISTRONI C is activated
( Y
page 176):
On e or two segments in th e set spee d range
ligh t up. R
Distanc e Pilot DISTRONI C detects a vehicl e in
fron t moving mor e slowly than th e store d
speed:
The segments between th e spee d of th e vehi-
cle in fron t and th e store d spee d ligh t up.
Tachometer
! Do no t driv e in th e overrevving range, as this
could damag e th e engine.
The red ban d in th e tachometer indicates th e
engine's overrevving range.
The fuel suppl y is interrupted to protect th e
engin e when th e red ban d is reached.
Outside temperature display You should pay special attention to road condi-
tion s when temperatures are aroun d freezing
point.
Bea r in min d that th e outside temperature dis-
play indicates th e temperature measured and
does no t record th e road temperature.
The outside temperature display is in th e multi-
function display ( Y
page 235).Displays and operation 233
On-board computer and displays Z

R
Highway mode R
Active light function R
Cornering light function R
Extended range fog lamps R
Off-road lights
Further information on the Intelligent Light Sys-
tem ( Y
page 117).
Vehicle submenu Activating/deactivating the automatic
door locking mechanism If you activate the Automatic Door Lock func-
tion, the vehicle is centrally locked above a
speed of approximately 9 mph (15 km/h). X
Press the Y or e button on the steering
wheel to select the Sett. menu.X
Press the d or c button to select the
Vehicle submenu.X
Press v to confirm.X
Press the d or c button to select the
Automatic Door Lock function.
When the Automatic Door Lock function is
activated, the vehicle doors are displayed in
orange in the multifunction display. X
Press the v button to save the setting.
For further information on the automatic locking
feature, see ( Y
page 84).
Activating/deactivating the acoustic
locking verification signal If you switch on the Acoustic Lock function, an
acoustic signal sounds when you lock the vehi-
cle. X
Press the Y or e button on the steering
wheel to select the Settings menu.X
Press the d or c button to select the
Vehicle submenu.X
Press v to confirm.X
Press the d or c button to select the
Acoustic Lock function.
If the Acoustic Lock function is activated,
the 7 symbol in the multifunction display
lights up orange. X
Press the v button to save the setting. Convenience submenu Activating/deactivating the EASY-
ENTRY/EXIT feature
G WARNING
When the EASY-ENTRY/EXIT feature adjusts
the steering wheel, you and other vehicle
occupants – particularly children – could
become trapped. There is a risk of injury.
While the EASY-ENTRY/EXIT feature is mak-
ing adjustments, make sure that no one has
any body parts in the sweep of the steering
wheel.
If somebody becomes trapped: R
press one of the memory function position
buttons, or R
move the switch for steering wheel adjust-
ment in the opposite direction to that in
which the steering wheel is moving.
The adjustment process is stopped. X
Press the Y or e button on the steering
wheel to select the Sett. menu.X
Press the d or c button to select the
Convenience submenu. X
Press v to confirm. X
Using d or c , select the Easy Entry/
Exit function.
If the Easy Entry/Exit function is activated,
the vehicle steering wheel is displayed in
orange in the multifunction display. X
Press the v button to save the setting.
Further information on the EASY-ENTRY/EXIT
feature ( Y
page 109).
Switching the seat belt adjustment on/off X
Press the Y or e button on the steering
wheel to select the Settings menu.X
Press the d or c button to select the
Convenience submenu. X
Press v to confirm. X
Press the d or c button to select the
Belt Adjustment function.
If the Belt Adjustment function is activated,
the vehicle seat belt is shown in orange in the
multifunction display. X
Press the v button to save the setting.244
Menus and submenus
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
The yellow $ warning lamp and th e red I (US A only) or $
(Canada only) indicator lamp ligh t up.
The electric parking brak e is malfunctioning .
To release: X
Switc h off th e ignition and tur n it bac k on .X
Releas e th e electric parking brak e manually.
or X
Releas e th e electric parking brak e automatically ( Y
page 162).
If th e electric parking brak e still canno t be released:X
Do no t drive on .X
Consult a qualified specialist workshop .
The red I (US A only) or $ (Canada only) indicator lamp flashes
and th e yellow $ warning lamp lights up.
The electric parking brak e is malfunctioning .
To release: X
Switc h off th e ignition and tur n it bac k on .X
Releas e th e electric parking brak e manually.
To apply : X
Switc h off th e ignition and tur n it bac k on .X
Apply th e electric parking brak e manually.
If th e red I (US A only) or $ (Canada only) indicator lamp con-
tinue s to flash: X
Do no t drive on .X
Secur e th e vehicl e against rollin g away ( Y
page 375).X
Shift th e transmission to position ] .X
Turn th e fron t wheels toward s th e curb.X
Consult a qualified specialist workshop .252
Display messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
The yellow $ warning lamp lights up. The red I (US A only)
or $ (Canada only) indicator lamp flashes for about te n seconds
after th e electric parking brak e has been applie d or released. It then
goe s out or remain s lit .
The electric parking brak e is malfunctioning .X
Switc h off th e ignition and tur n it bac k on .X
Apply th e electric parking brake.
If it is no t possibl e to engage th e electric parking brake:X
Shift th e transmission to position ] .X
Visit a qualified specialist workshop .
If it is no t possibl e to release th e electric parking brake:X
Releas e th e electric parking brak e automatically ( Y
page 162).
If th e electric parking brak e still canno t be released:X
Consult a qualified specialist workshop .
The yellow $ warning lamp lights up. If you manually apply or
release th e electric parking brake, th e red I (US A only) or $
(Canada only) indicator lamp flashes .
The electric parking brak e is malfunctioning . It is no t possibl e to apply
th e electric parking brak e manually.X
Shift th e transmission to position ] .X
Visit a qualified specialist workshop .
I (US A
only)
$ (Canada
only)
Parkin g Brake Inop‐
erativ e The yellow $ warning lamp lights up. The red I (US A only)
or $ (Canada only) indicator lamp flashes for about te n seconds
after th e electric parking brak e has been applie d or released. It then
goe s out or remain s lit .
The electric parking brak e is malfunctioning , e.g. because of over-
voltag e or undervoltage. X
Remove th e caus e for th e overvoltage or undervoltage, e.g. by
charging th e battery or restarting th e engine.X
Engage or release th e electric parking brake.
If it remain s impossible to apply or release th e electric parking brake:X
Switc h off th e ignition and tur n it bac k on .X
Engage or release th e electric parking brake.
If th e electric parking brak e still canno t be released:X
Consult a qualified specialist workshop .
If th e electric parking brak e still canno t be applied:X
Visit a qualified specialist workshop .Display messages 25 3
On-board computer and displays Z