2012 MERCEDES-BENZ GL SUV trailer

Displa
ymessages Possible causes/consequences and
M Solutions
÷
in
operative See Owner'
sManual ESP
®
,B AS, PRE-SAFE ®
,t he HOL Dfunction, hill start assist, cross-
wind driving assistance and ESP ®
trailer stabilisatio nare not avail-
ab ledue to amalfunction.
The adaptive brake lights, COLLISION PREVENTION ASSIST, BAS
PLUS and PRE-SAFE ®
Brake may als ohave failed.
In addition, the ÷andå warning lamp slight up in the
instrument cluster.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but withou tthe
func tions listed above. The wheels coul dtherefore lock if you
brake hard, for example.
The brakin gdistance in an emergenc ybraking situatio ncan thus
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilis ethe vehicle.
The danger of skidding and having an accident increases.
X Drive on carefully.
X Visit aqualified specialist workshop. T!
÷
inoperativ
eSee Owner's Manual EBD (electroni
cbrake force distribution) ,ABS ,ESP ®
,B AS ,PRE-
SAFE ®
,t he HOL Dfunction, hill start assist, crosswind driving
assistance and ESP ®
trailer stabilisation are not available due to
am alfunction.
The adaptive brake lights ,COLLISION PREVENTION AS SIST, BAS
PLU Sand PRE-SAFE ®
Brake may also have failed.
In addition, the ÷,åand! warning lamps light up in
the instrument cluster and awarnin gtones ounds.
ATTENTION ASSI STis deactivated.
G WAR
NING
The brake sys temc ontinues to fu nction normally, but without the
function slisted above. The wheels could therefore lock if you
brak ehard, for example.
The steerabilit yand braking characteristics may be seve rely affec-
ted. The braking distanc einanemergency braking situation can
increase.
If ESP ®
is not opera tional, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and havi ngan accident increases.
X Drive on carefully.
X Visit aqualified specialist worksho pimmediately. Display mess
ages
293On-board computer and displays Z

Displa
ymessages Possible causes/consequences and
M Solutions
6
Re
ar centre mal‐ function Consult
workshop SRS ha
smalfunctioned at th erear centre. The 6warning lamp
also lights up in th einstrument cluster.
G WARNING
The airbags or belt tensioners ma yeither be triggered uninten-
tionally or, in the even tofanaccident, may not be triggered.
Th isposes an incr easedriskofi njury.
X Vis itaq uali fieds pecialist workshop. 6
Left
windowbag mal‐
function Consult
workshop or
Right windowba
gmalfunc‐ tion Consul
twork‐ shop There is
amalfunction in the left-hand and/or right-han dwindow-
bag. The 6warnin glamp also lights up in the instrument clus-
ter.
G WARNING
The left or right windowbag may either be triggered unintentionally
or, in the event of an accident, may not be triggered.
This pose sanincreased risk of injury.
X Visit aqualified specialist workshop. Lights
i Display messages about LEDs:
This display messag ewill only appear if all LED shave failed. Display messages Possible causes/consequences and
M Solutions
b
Left cornering
light orRigh
tcor‐ nering light Th
eleft or right-han dcornerin glight is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 129).
or
X Visit aqualified specialist workshop. b
Left dipped
beam orRigh
tdipped beam Th
eleft or right-han ddipped-beam headlamp is faulty.
X Check whether you are permitted to replace the bulb yourself
(Y page 129).
or
X Visit aqualified specialist workshop. b
Traile
rleft indi‐ cator or
Trailer right indicator Th
eleft or right-han dtrailer turn signa llamp is faulty.
X Check whethe ryou ar epermitted to replace the bulb yourself.
or
X Visit aqualified specialist workshop. 300
Display messagesOn-board computer and displays

Displa
ymessages Possible causes/consequences and
M Solutions
b
Le
ft daytim edriv‐ ing lamp or
Ri ght daytim
edriving lamp Th
eleft-han dorright-hand daytime drivin glamp is faulty.
X Chec kwhether you ar epermitted to replace the bulb yourself
(Y page 129).
or
X Visit aqualified specialist workshop. b
Intell
.Light Sys‐ tem inoperative Th
eI ntelligent Light Syste misfaulty. The lights remain available
without the Intelligent Light System.
X Visit aqualified specialist workshop. b
Malfunctio
nSee Owner's Manual Th
ee xterior lighting is faulty.
X Visit aqualified specialist workshop. Vehicles with trailer tow hitch:
afuse may have blown.
X Check the fuses (Y page 391).
X If necessary, replace the blown fuse. Observe the warning notes
as you do so.
If the displa ymessage continues to be displayed:
X Visit aqualified specialist workshop. b
AUTO
lights inoper‐
ative The light senso
risf aulty.
X Visit aqualified specialist workshop. b
Switch of
flights Th
elights are still switched on when you leave the vehicle. A
warnin gtone also sounds.
X Tur nthe light switc htoÃ. Adaptive Main-beam
Assist inoperative Adaptive Highbea
mAssist is faulty.
X Visit aqualified specialist workshop. Adaptive Main-beam
Assist currently
unavailabl
eSee Owner's Manual Adaptive Highbea
mAssist is deactivate dand temporarily inoper-
ative. Possible causes:
R the windscreen is dirty in the camera's field of vision.
R visibility is impaired due to heavy rain, sno worfog.
X Clean the windscreen.
If the system detec tsthat the camera is fully operational again,
the Adaptive Main-beam Assist available again message
is displayed.
Adaptive Highbeam Assist is operational again. Display messages
303On-board computer and displays Z

Driving systems
Display messages Possible causes/consequences and
M Solutions
À
At
tention Assist: Tak
eab reak! Base
doncertai ncrite ria, ATTENTION ASSIST ha sdetecte dfatigue
or alack of con centration on the part of the driver. Awarning tone
als os ounds.
X If necessary, tak eabreak.
During long journe ys,take regular breaks in goo dtime so that you
get enoug hrest. À
Attention Assist
inoperative ATTENTION ASSIS
Tisinoperative.
X Visi taq ualifieds pecialist workshop. Á
Please
reduce speed You can
notc hang ethe vehicle level. Possible causes:
R you ar edriving to ofast for the selected vehicle level.
R you are towing atrailer.
R thet railer-coupling socket is being used ,e.g. for abicycle rack.
X Driv emore slowly and then select the desire dvehicle level
again.
R Vehicles with the ON&OFFROA Dpackage (Y page 207)
R Vehicles with the AIRMATI Cpackage (Y page 213)
X Observ ethe notes on towing atrailer (Y page 257). Á
Co
mpressor is cool‐
ing Yo
uh ave selected ahigher vehicle level. The compressor first
needs to cool down because of frequen tlevel changes.
X Driv einam anner appropriate for the curren tvehicle level.
X Make sure that ther eissufficien tground cle arance.
X Allow the compresso rtocool down.
When the compressor has cooled down, the display message
disappears. The vehicle then con tinues rising to the selected
level. Á
Malfunction AIRMATIC is faulty.
X
Drive as appropriate for the current vehicl elevel, but do not
exceed 80 km /h.
X Make sur ethat ther eissufficient ground clearance.
X Have the vehicle checked at aqualified specialist workshop. Display messages
307On-board computer and displays Z

Displa
ymessages Possible causes/consequences and
M Solutions
Vehicles wit
hBecker ®
MA PPILOT :ifthe Becker ®
MA PPILOT is
not connected, the radar sensor syste misdeactivated automati-
cally.
BAS PLUS, DI STRONIC PLUS, Blind Spot Assis torActive Blind
Spo tAssist and PRE-SAFE ®
Brake ar enot available.
X Connect the Bec ker®
MAP PILOT; see the separate operating
inst ructions. Lane Keeping
Assist currently
unavailable See
Owner's Manual
Active Lane Keep‐
ing Assist cur‐
rently unavailable
See Owner's Manual Lane Keeping Assist or Active Lane Keeping Assist is deactivated
and temporarily inoperative. Possibl
ecauses:
R the windscreen is dirty in the camera' sfield of vision.
R visibility is impaired due to heavy rain, snow or fog.
R there are no lane markings for alonger period.
R the lane markings ar eworn ,dark or covered, e.g. by dirt or snow.
When the causes listed above no longer apply ,the displa ymes-
sage goes out.
Lan eKeeping Assist or Active Lan eKeeping Assist is operational
again.
If the display message does not disappear:
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Secure the vehicle against rollin gaway (Y page 181).
X Clean the windscreen. Lane Keeping
Assist inoperative
Active Lane Keep‐
in
gA ssist inoper‐ ative Lan
eKeeping Assist or Active Lan eKeeping Assist is faulty.
X Visit aqualified specialist workshop. Blin
dSpot Assist currently unavail‐
able See Owner's
Manual
Active Blind Spot
Assist currently
unavailable See
Owner's Manual Blind Spot Assist or Active Blind Spot Assist is temporarily inop-
erative.
Yo uh ave established the electrical connection between the trailer
and your vehicle.
X Press aon the steering wheel to confirm the display mes-
sage.
Blind Spot Assis torActive Blind Spo tAssist is deactivate dwhile
towing atrailer. Display messages
311On-boardcompu tera nd displays Z

Displa
ymessages Possible causes/consequences and
M Solutions
j
Ch
eckt railer hitch lock Th
et railer to whitch is no tcorrectly engaged.
Aw arning ton ealso sounds.
X Stop th evehicle immediately, payin gattentio ntoroad and traf-
fic conditions, and switc hoff th eengine.
X Secure the vehicl eagainst rolling away (Y page 181).
X Engage the trailer coupling' sball coupling in the end position
(Y page 259). Ð
Power
steering mal‐
function Se
eOwn‐ er's Manual Th
ep ower steerin gassistanc eisf aulty.
Aw arning ton ealso sounds.
G WARNING
You will need to use mor eforce to steer.
Ther eisar isk of an ac cident.
X Check wheth er youare able to appl ythe ext raforce required.
X If you are abl etosteer safely: carefully drive on to aqualified
specialist workshop.
X If you are unable to steer safely: do not drive on. Contact the
nearest qualified specialist workshop. &
inoperativ
eBat‐ tery low Yo
uh ave attempted to switch on the auxiliary heating or to acti-
vate adeparture tim eusing the on-boar dcomputer after operating
the auxiliary heatin gtwice.
X Let the engine run for 10 seconds.
The auxiliary heating is operational again. The on-board voltage is too low. The auxiliary heating has switched
itself off or cannot be switched on (Y
page 148).
X Driv efor alonger distance.
The battery is being charged. The auxiliary heatin gisoperational
again as soon as the on-boar delectrical system voltage is suf-
ficient. &
inoperative
Refuel
vehicle There is too little fuel in the fuel tank
.The auxiliary heating cannot
be switched on (Y page 148).
X Refuel at the nearest filling station. Displa
ymessages
321On-board compu tera nd displays Z

Problem Possible causes/consequences and
M Solutions
!
The yellow AB
Swarning
lamp is lit while the
engine is running. ABS (Anti-lock Brake System) has been deactivated due to
afault.
For this reason, BAS (Brake Assist), BAS PLUS, ESP ®
(Electronic
Stability Program), PRE-SAFE ®
,P RE-SAFE ®
Brake, COLLISION
PREVENTION ASSIST, the HOLD function, hill start assist, cross-
wind driving assistance, adaptive brake lights and ESP ®
trailer
stabilisation, for example, are also deactivated.
ATTENTION ASSIST is deactivated.
G WARNING
The brake syste mcontinue stofunction normally, but without the
functions listed above. The wheel scould therefor elock if you
brake hard ,for example.
The steerabilit yand braking characteris tics may be severely affec-
ted .The brakin gdistance in an emergenc ybraking situatio ncan
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilis ethe vehicle.
The danger of skidding and having an accident increases.
X Observ ethe additiona ldisplay messages in the multifunction
display.
X Driv eonc arefully.
X Visit aqualified specialist workshop.
If the ABS control unit is faulty, there is also apossibility that other
systems, such as the navigation system or the automatic trans-
mission ,will not be available. Warning and indicator lamp
sinthe instrument cluster
327On-board computer and displays Z

Problem Possible causes/consequences and
M Solutions
!
The yellow AB
Swarning
lamp is lit while the
engine is running. ABS is temporarily unavailable. Therefore, BAS
,BAS PLUS, ESP ®
,
EBD (electronic brake force distribution), PRE-SAFE ®
,
PRE-SAFE ®
Brake, COLLISION PREVENTION ASSIST, the HOLD
function, hil lstart assist, crosswind driving assistance, the adap-
tive brake lights and ESP ®
trailer stabilisation, for example, are
also deactivated.
ATTENTION ASSIST is deactivated.
Possible causes:
R self-diagnosis is not yet complete.
R the on-board voltage may be insufficient.
G WARNING
The brake syste mcontinue stofunction normally, but without the
functions listed above. The front and rear wheel scould therefore
lock if you brake hard ,for example.
The steerabilit yand braking characteris tics may be severely affec-
ted .The brakin gdistance in an emergenc ybraking situatio ncan
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilis ethe vehicle.
There is arisk of an accident.
X Carefull ydrive on asuitable stretch of road, making slight steer-
ing movement sataspeed above 20 km/h.
The functions mentioned above are available again when the
warning lamp goes out.
If the warning lamp is still on:
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. 328
Warnin
gand indicator lam psin th einstru ment clusterOn-board computer and displays