2018 MERCEDES-BENZ GLS engine

There is a short delay before a change in outside
temperature appears in the multifunction dis-
play.
Coolant temperature gauge
G WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
! If the coolant temperature is too high, a dis-
play message is shown.
If the coolant temperature display is in the
area marked in red, do not continue driving.
Otherwise, the engine will be damaged.
The coolant temperature gauge is in the instru-
ment cluster on the right-hand side ( Y
page 37).
Under normal operating conditions and with the
specified coolant level, the coolant temperature
gauge may rise to the red marking. Operating the on-board computer
Overview
C
Multifunction display D
Right control panel

X
Press the a or v button to start dialing.
or X
To exit the redial memory: press the v
or 8 button.
Assistance menu
Introduction Depending on the equipment installed in the
vehicle, you have the following options in the
DriveAssist menu:R
Displaying the assistance graphic
( Y
page 241) R
Activating/deactivating the Traffic Sign
Assist display ( Y
page 241)R
Activating or deactivating Steering Pilot
( Y
page 241) R
Activating or deactivating Active Brake Assist
( Y
page 242) R
Activating or deactivating Active Brake Assist
with cross-traffic function ( Y
page 242)R
Activating/deactivating ATTENTION ASSIST
( Y
page 242) R
Activating/deactivating Blind Spot Assist or
Active Blind Spot Assist ( Y
page 242)R
Activating/deactivating Lane Keeping Assist
or Active Lane Keeping Assist ( Y
page 242)
Displaying the assistance graphic
X
Press the Y or e button on the steering
wheel to select the DriveAssist menu.X
Press c or d to select Assistance
Graphic .X
Confirm by pressing v on the steering
wheel.
The multifunction display shows the Distance
Pilot DISTRONIC distance display in the assis-
tance graphic display.
The assistance graphic displays the status of
and information from the following driving
systems or driving safety systems: R
Traffic Sign Assist ( Y
page 208)R
Distance Pilot DISTRONIC ( Y
page 176)R
Active Brake Assist ( Y
page 67)R
Active Brake Assist with cross-traffic func-
tion ( Y
page 73) R
ATTENTION ASSIST ( Y
page 207)R
Lane Keeping Assist ( Y
page 211) or Active
Lane Keeping Assist ( Y
page 215)R
DSR ( Y
page 218) R
Off-road program (vehicles with Off-Road
Engineering package) ( Y
page 220)R
Rear window wiper ( Y
page 123)X
Press d to display the ATTENTION ASSIST
assessment.
Traffic Sign Assist You can switch the Traffic Sign Assist message
function on or off in the Traffic Sign Assist
menu. When the function is activated, detected
traffic signs and information appear in the mul-
tifunction display for five seconds. X
Press the Y or e button on the steering
wheel to select the DriveAssist menu.X
Press the c or d button to select
Traffic Sign Assist .X
Confirm by pressing v on the steering
wheel.
The current selection appears. X
To activate/deactivate the message func-
tion: press the v button again.
For further information about Traffic Sign Assist,
see ( Y
page 208).
Activating or deactivating Steering Pilot X
Press the Y or e button on the steering
wheel to select the DriveAssist menu.X
Press c or d to select Steering
Pilot . X
Confirm by pressing v on the steering
wheel.
The current selection appears. X
To activate/deactivate: press the v but-
ton again.
When the Steering Pilot is activated, the mul-
tifunction display displays a Steering Pilot
On message.
Further information about Distance Pilot
DISTRONIC with Steering Pilot ( Y
page 182).Menus and submenus 241
On-board computer and displays Z

For further information on belt adjustment, see
( Y
page 48).
Switching the fold-in mirrors when lock-
ing feature on/off This function is only available when the vehicle is
equipped with the electrical fold-in function.
When you activate the Auto. Mirror Folding
function, the exterior mirrors are folded in when
the vehicle is locked. The exterior mirrors fold
out automatically again as soon as you unlock
the vehicle. 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
Press the d or c button to select the
Auto. Mirror Folding function.
If the Auto. Mirror Folding function is
switched on, the multifunction display shows
the exterior mirror in orange. X
Press the v button to save the setting.
If you have switched the Auto. Mirror Fold‐
ing on and you fold the exterior mirrors in using
button C , they will not fold out automatically
( Y
page 111).
You can then only fold out the exterior mirrors
using button C .
Restoring the factory settings 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
Factory Setting submenu.X
Press v to confirm.
The Reset All Settings? message
appears. X
Press the d or c button to select No or
Yes . X
Press v to confirm the selection.
If you select Yes , the multifunction display
shows a confirmation message.
If you want to reset the Daytime Running
Lights function in the Light submenu, you
must turn the SmartKey to position G in the
ignition lock.
ON&OFFROAD menu X
Press the Y or e button on the steering
wheel to select the ON&OFFROAD menu.
You can view the current off-road program set-
tings in the ON&OFFROAD menu:R
Vehicles with the Off-Road Engineering pack-
age ( Y
page 220) R
Vehicles without the Offroad Engineering
package ( Y
page 219)
AMG menu (Mercedes-AMG vehicles)
Warm-up
C
Digital speedometer D
Gear indicator

X
Press the 8 button on the steering wheel.X
Confirm Yes with v .
The RACETIMER interrupts timing if you stop the
vehicle and turn the SmartKey to position G in
the ignition lock. If you turn the SmartKey to
position I and then press v to confirm
Start timing is continued.
Resetting the current lap X
Stop the RACETIMER. X
Press the Y or e button to select
Reset Lap .X
Press v to reset the lap time to "0".
Deleting all laps
If you switch off the engine, the RACETIMER is
reset to "0" after 30 seconds. All laps are
deleted.
You cannot delete individual stored laps. If you
have stopped 16 laps, the current lap does not
have to be reset. X
Reset the current lap. X
Press v to confirm Reset .
Reset Race Timer? appears in the multi-
function display. X
Press the d button to select Yes and press
the v button to confirm.
All laps are deleted.
Overall statistics
C
RACETIMER overall evaluation
D
Total time driven

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

Display messages
Possible causes/consequences and P Solutions
The yellow $ warning lamp lights up and th e red I (US A only)
or $ (Canada only) indicator lamp flashes .
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 .
' (US A only)
M (Canada only)
Check Brake Fluid
Level There is no t enough brak e flui d in th e brak e flui d reservoir . In addition ,
th e ' (US A only) or M (Canada only) warning lamp lights up in
th e instrumen t cluste r and a warning tone sounds.
G WARNIN G
The braking effec t may be impaired.
There is a ris k of an accident.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions. Do no t continu e drivin g
under any circumstances. X
Secur e th e vehicl e against rollin g away ( Y
page 161).X
Consult a qualified specialist workshop .X
Do no t add brak e fluid . This does no t correc t th e malfunction .
& Check Brake Pad Wea r The brak e pads/linings hav e reached their wear limit.
US A only: th e ' red brak e system warning lamp is lit while th e
engin e is running. X
Visit a qualified specialist workshop .
S Inoperative On e or mor e main features of th e mbrace system are malfunctioning .X
Visit a qualified specialist workshop .
Active Brake Assist
Functions Currently
Limite d See Opera‐
tor's Manual Active Brake Assis t wit h cross-traffic function is temporarily inopera-
tive.
Possibl e causes are: R
The radar sensor system is temporarily inoperative, e.g. due to
electromagneti c radiation emitted by nearby TV or radi o station s or
other source s of electromagneti c radiation .R
The system is outside th e operating temperature range.R
The on-boar d voltag e is to o low.
Whe n th e causes state d abov e no longer apply, th e display message
disappears.
Active Brake Assis t wit h cross-traffic function or PRE ‑ S AF E ®
PLU S is
functional again .
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 161).X
Restart th e engine.254
Display messages
On-board computer and displays

Display messages
Possible causes/consequences and P Solutions
Active Brake Assist
Functions Currently
Limite d See Opera‐
tor's Manual Active Brake Assis t is unavailable due to a malfunction . Adaptive
Brake Assis t may also hav e failed.X
Visit a qualified specialist workshop immediately.
PRE-SAFE Inopera‐
tiv e See Operator' s
Manual Importan t function s of PRE-SAF E ®
hav e failed. Al l other occupant
safet y systems , e.g. air bags , remain available.X
Visit a qualified specialist workshop immediately.
Active Brake Assist
Functions Currently
Limite d See Opera‐
tor's Manual Active Brake Assis t or PRE ‑ SAFE ®
PLU S is temporarily inoperative.
Possibl e causes are: R
Function is impaire d due to heav y rain or snow.R
The radar sensor system is temporarily inoperative, e.g. due to
electromagneti c radiation emitted by nearby TV or radi o station s or
other source s of electromagneti c radiation .R
Mercedes-AMG vehicles: ES P ®
is deactivated.R
The system is outside th e operating temperature range.R
The on-boar d voltag e is to o low.
Whe n th e causes state d abov e no longer apply, th e display message
disappears.
Active Brake Assis t or PRE ‑ SAFE ®
PLU S is operative again .
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 161).X
Restart th e engine.X
Mercedes-AMG vehicles: switch ES P ®
on again ( Y
page 71).
Active Brake Assist
Functions Limite d
See Operator' s Man ‐
ual Active Brake Assis t wit h cross-traffic function or PRE ‑ S AF E ®
PLU S is
no t available due to a malfunction .X
Visit a qualified specialist workshop immediately. Display messages 25 5
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
Radar Sensor s Dirty
See Operator' s Man ‐
ual The radar sensor system is malfunctioning .
Possibl e causes are: R
dir t on sensor sR
heav y rain or snow R
when drivin g on inter-urban roads without traffic or infrastructure,
e.g. in desert-like area s
At least on e drivin g system or drivin g safet y system is malfunctioning
or is temporarily unavailable :R
PRE-SAF E ®
PLU SR
Active Brake Assis tR
Active Lan e Keepin g Assis tR
Active Blind Spot Assis tR
Distanc e Pilo t DISTRONI C
If th e radar sensor system in fron t is dirty, Active Blind Spot Assis t will
no t perfor m a course-correcting brak e application .
A warning tone also sounds.
Once th e caus e of th e problem is no longer present, th e drivin g and
drive safet y systems will be available again . The display message dis-
appears.
If th e display message does no t disappear :X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 161).X
Switc h off th e engine.X
Clean all sensor s ( Y
page 334).X
Restart th e engine.
The display message disappears.
u SRS Malfunction Ser ‐
vic e Required The restrain t system is malfunctioning .
The u warning lamp also lights up in th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately.
Fo r further information about th e restrain t system, see ( Y
page 44) .
u Front Lef t Malfunc‐
tio n Servic e
Required or Front
Lef t Malfunction
Servic e Required The restrain t system has malfunctioned at th e fron t on th e lef t or right .
The u warning lamp also lights up in th e instrumen t cluster.
G WARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th e event of an accident, may no t be triggered .
There is an increased ris k of injury.X
Visit a qualified specialist workshop immediately.256
Display messages
On-board computer and displays