2012 MERCEDES-BENZ GL SUV ECU

Displa
ymessages Possible causes/consequences and
M Solutions
Pa
rk Assist inoper‐
ative Yo
uh avej ustc arrie doutalarg enumber of turning or parking
manoeuvres.
Active Parking Assist will become available again after approx-
imately ten minutes (Y page 219).
X Pull over and stop the vehicle safel yassoon as possible ,paying
attention to road and traffic conditions.
X Switch off and restart the engine.
If the display message continues to be displayed:
X Visit aqualified specialist workshop. PARKTRONI
Cisfaulty.
X Visit aqualified specialist workshop. Park Assist
switched off The vehicle is parked.
Awarning ton ealso sounds.
The display message disappear sautomatically. DI
STRONIC PLU Soff DISTRONIC PLUS ha
sbeen deactivate d(Ypage 198).
If it was deactivate dautomatically, awarning ton ealso sounds. DI
STRONIC PLUS available again DISTRONIC PLUS is operational agai
nafter having been tempo-
rarily unavailabl e. Youcan now reactivat eDISTRONIC PLUS
(Y page 198). DISTRONIC PLUS cur‐
rently unavailable
See Owner's Manual DISTRONIC PLUS is temporarily inoperative. Possible causes:
R thef unction is impaired due to heavy rain or snow.
R the sensors in the radiator trim and in the bumpers are dirty.
R the radar senso rsystem is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio sta-
tions or othe rsources of electromagnetic radiation.
R the system is outside the operatin gtemperature range.
R the on-boar dvoltage is too low.
Aw arning ton ealso sounds.
When th ecauses listed above no longer apply, the display mes-
sage goes out.
DISTRONI Cisoperational again.
If th edisplay message does no tdisappear:
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 sensors in the radiator trim and in the bumpers
(Y page 370).
X Restar tthe engine. Displa
ymessages
313On-board compu tera nd displays Z

Tyres
Display messages Possible caus
es/consequences andM Solutions
Tyre pressure
Check tyres Th
et yre pressure loss warning system ha sdetected asignif icant
loss in pressure.
Aw arning ton ealso sounds.
G WARNING
Wit htyrep ressures which are too low, there is arisk of the fol-
lowing hazards:
R they ma yburst, especiall yasthe load and vehicle speed
increase.
R they ma ywear excessively and/or unevenly, which may greatly
impair tyr etraction.
R thed riving characteristics, as well as steering and braking, may
be greatl yimpaired.
There is arisk of an accident.
X Stop the vehicle without makin gany sudden steering or braking
manoeuvres .Pay attention to the traffic conditions as you do
so.
X Secure the vehicle against rolling away (Y page 181).
X If there is aflat tyre, inspect the tyres (Y page 378).
X Check the tyre pressures and, if necessary, correct the tyre
pressure.
X Restart the tyre pressure loss warnin gsystem when the tyre
pressure is correct (Y page 401).Check tyr
epres‐ sures then restart
Run Flat Indicator Th
et yre pressure los swarning system generated adispla ymes-
sage and has not been restarted since.
X Set the cor rect tyre pressure in all four tyres.
X Restart the tyre pressure los swarning system (Y page 401). Run Flat Indica
tor inoperative Th
et yre pressure los swarning system is faulty.
X Visit aqualified specialist workshop. Tyre pressu
re will
be displayed after
driving
afew minutes Th
et yre pressure monitor is measuring the tyre pressure.
X Driv eon.
The tyre pressures appear in the multifunction display after you
have bee ndriving for afew minutes. Tyre press. moni‐
to
ri noperative Th
et yre pressure monitor is faulty.
X Visit aqualified specialist workshop. Display messages
315On-board computer and displ ays Z

Displa
ymessages Possible causes/consequences and
M Solutions
Ty
re press. moni‐ tor inoperative No
wheel sensors Th
ew heels fitte ddonot have asuitable tyr epressure se nsor.T he
tyr ep ressure monito risd eactivated.
X Fit wheels with suitable tyr epressure sensors.
Th et yre pressure monitor is activated automatically after driv-
ing for afew minutes. Chec
ktyre(s) Th
et yre pressure in one or more tyres has droppe dsignificantly.
The wheel position is displayed in the multifunction display.
Aw arning ton ealso sounds.
G WARNING
Wit htyrep ressures which are too low, there is arisk of the fol-
lowing hazards:
R they ma yburst, especiall yasthe load and vehicle speed
increase.
R they ma ywear excessively and/or unevenly, which may greatly
impair tyr etraction.
R thed riving characteristics, as well as steering and braking, may
be greatl yimpaired.
There is arisk of an accident.
X Stop the vehicle without makin gany sudden steering or braking
manoeuvres .Pay attention to the traffic conditions as you do
so.
X Secure the vehicle against rolling away (Y page 181).
X If there is aflat tyre, inspect the tyres (Y page 378).
X Check the tyre pressure (Y page 402).
X If necessary, correct the tyre pressure. 316
Display messagesOn-board computer and displays

Displa
ymessages Possible causes/consequences and
M Solutions
Wa
rning tyre defect Th
et yrep ressur eino neormore tyre shas dropped suddenly. The
wheel position is displayed in the multifunc tion display.
G WARNING
If you drive with aflat tyre, there is arisk of the following hazards:
R Af lat tyre affect sthe ability to steer or brake the vehicle.
R You could lose con trol of the vehicle.
R Continue ddriving wit haflat tyre will cause excessive heat build-
up and possibly afire.
There is arisk of an accident.
X Stop the vehicle without makin gany sudden steerin gorbraking
manoeuvres .Pay attention to the traffic conditions as you do
so.
X Secure the vehicle against rolling away (Y page 181).
X If there is aflat tyre, inspect the tyres (Y page 378).Rectif
ytyre pres‐ sure Th
et yre pressure is too low in at leas tone of the tyres, or the tyre
pressure difference between the wheels is too great.
X Check the tyre pressures at the next opportunity
(Y pag e402).
X If necessary, corre ctthe tyre pressure.
X Restart the tyre pressure monitor (Y page 403).Wheel sensor(s)
missing There is no signal from the tyre pressure sensor of one or several
wheels. The pressure of the affected tyre is not displayed in the
multifunction display.
X
Have the faulty tyre pressure sensor replaced at aqualified spe-
cialist workshop. Tyre press. moni‐
to
rc urrently unavailable Due to
asource of radio interference, no signal scan be received
from the wheel sensors. The tyre pressure monitor is temporarily
malfunc tioning.
X Drive on.
The tyr epressure monitor restarts automaticall yassoon as the
problem has been solved. Displa
ymessages
317On-board compu tera nd displays Z

Displa
ymessages Possible causes/consequences and
M Solutions
h
Ty
re pressure Cau‐ tio
nT yrem alfunc‐ tion Th
et yrep ressur eino neor mor etyres has dropped suddenly.
Aw arning ton ealso sounds.
G WARNING
If you driv ewithaf lat tyre, there is arisk of the following hazards:
R Af lat tyre affects the ability to steer or brake the vehicle.
R You could lose control of the vehicle.
R Continued drivin gwithaflat tyre will cause excessive heat build-
up and possibly afire.
There is arisk of an accident.
X Stop the vehicle without makin gany sudden steering or braking
manoeuvres .Pay attention to the traffic conditions as you do
so.
X Secure the vehicle against rolling away (Y page 181).
X If there is aflat tyre, inspect the tyres (Y page 378).h
Tyre pressure
Chec
ktyre(s) Th
et yre pressure in one or more tyres has droppe dsignificantly.
G WARNING
With tyre pressures which are too low, there is arisk of the fol-
lowing hazards:
R they may burst, especiall yasthe load and vehicle speed
increase.
R they ma ywear excessively and/or unevenly, which may greatly
impair tyr etraction.
R thed riving characteristics, as well as steering and braking, may
be greatl yimpaired.
There is arisk of an accident.
X Stop the vehicle without makin gany sudden steering or braking
manoeuvres .Pay attention to the traffic conditions as you do
so.
X Secure the vehicle against rolling away (Y page 181).
X If there is aflat tyre, inspect the tyres (Y page 378).
X Check the tyre pressure (Y page 402).
X If necessary, correct the tyre pressure. h
Please correct
tyre pressure The tyre pressure is too low in at least one of the tyres, or the tyre
pressure difference between the wheels is too great.
X
Check the tyre pressures at the next opportunity
(Y page 402).
X If necessary, correct the tyre pressure. 318
Display messagesOn-board computer and displays

Vehicle
Display messages Possible caus
es/consequences and M Solutions
To start engine,
shift to either P
or N Yo
uh avea ttempte dtostart the engine with the transmission in
position Ror D.
X Shift the transmission to position Por N. Auxiliary battery
malfunction The auxiliary battery for the automatic transmission is no longer
being charged.
X Visit aqualified spec ialist worksho patthe nex toppor tunity.
X Until then, set the automatic transmission to position Pbefore
yo us witch off the engine.
X Before leaving the vehicle, appl ythe electr ic parking bra ke.
X Secure the vehicle agai nstrolling away ( Ypage 181). Ap
plyb rake to deselect Par
k(P) position Yo
uh ave attempted to mov ethe transmission selector lever to
position D,Ror Nwithout depressing the brake pedal.
X Depress the brake pedal. Risk of vehicle
rollin
gTransmis‐ sion not in P Th
ed river's door is open and th etransmission is in position R,N
or D.
Aw arning ton ealso sounds.
X Shift th etransmissio ntoposition P.
X Secur ethe vehicl eagainst rolling away ( Ypage 181). Wi
thoutc hanging gear, consult work‐
shop Yo
uc annot change the transmission position due to amalfunction.
Aw arning ton ealso sounds.
If transmission position Dis selected:
X Drive to aqualified specialist workshop without shiftin gthe
transmissio nfromp osition D.
If transmission position R,Nor Pis selected:
X Consult aqualified specialist workshop. On
ly select Park (P) whe
nvehicle is stationary Th
ev ehicle is moving.
X Pull ove rand sto pthe vehicle safel yassoonasp ossible, paying
attention to roa dand traffic conditions.
X Shift the transmissio ntoposition P. Display messages
319On-board computer and displays Z

Displa
ymessages Possible causes/consequences and
M Solutions
A The tailgat
eisopen.
G WARNING
When the engine is running ,exhaus tgases can enter the vehicle
interior if the tailgate is open.
There is arisk of poisoning.
X Close the tailgate. ? The bonnet is open.
Aw
arning ton ealso sounds.
G WARNING
The open bonne tmay then block your view when the vehicle is in
motion.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible ,paying
attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 181).
X Close the bonnet. Active bonnet mal‐
function Se
eOwn‐ er's Manual Th
ea ctive bonnet (pedestrian prote ction) is not activ edue to a
malfunction or because it has already been triggered.
X Visit aqualified specialist workshop. C At least one door is open.
Aw
arning ton ealso sounds.
X Close all doors. _
2nd
se
at row, left
Not locked or
2nd sea
tr ow,r ight Not locked Th
es econ drow of seat sisnot engage donthe left-hand and/or
ri gh t-hand side in the rear.
X Fol db ackt he second row of seats unt ilit engages. _
3rd
seat row, left
No
tl ocked or
3rd sea
trow,r ight Not locked Th
et hird row of seats is not engaged on the left-hand or ri ght-hand
side.
X Fol db ackt he third row of seats unt ilit engages. 320
Display messagesOn-board computer and displays

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