2012 MERCEDES-BENZ GL SUV Owners Manual

Safety systems
Problem Possible causes/consequences and
M Solutions
J
The yellow brake sys-
tem warnin glamp
lights up while the
engine is running. G
WARNING
The brake system is malfunctioning and the braking characteris-
tics may be affected.
There is arisk of an accident.
X If the multifunction display shows adisplay message, please
observe this.
X Driv eonc arefully.
X Visit aqualified specialist workshop. J
The red brake system
warning lamp comes on
while the engine is run-
ning. Awarning tone
also sounds. G
WARNING
The brake boosting effect is malfunctioning and the braking char-
acteristic smay be affected.
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. Do not continue driving
under any circumstances.
X Secure the vehicle against rolling away (Y page 181).
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction
display. J
The red brake system
warning lamp comes on
while the engine is run-
ning. Awarning tone
also sounds. There is insufficient brake fluid in the fluid reservoir.
G WARNING
The braking efficienc ymay be impaired.
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. Do not continue driving
under any circumstances.
X Secure the vehicle against rolling away (Y page 181).
X Do not top up the brake fluid. Topping up will not rectif ythe
fault.
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction
display. 326
Warnin
gand indicator lam psin th einstru ment clusterOn-board computer and displays

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

Problem Possible causes/consequences and
M Solutions
!
The yellow AB
Swarning
lamp is lit while the
engine is running. A
warning tone also
sounds. EBD is faulty. Therefore, ABS
,BAS, BAS PLUS, ESP ®
,P RE -SAFE ®
,
PRE-SAFE ®
Brake, COLLISION PREVENTION ASSIST ,the HOLD
function, hill start assist, crosswind drivin gassis tance, the adap-
tive brake lights and ESP ®
trai lers tabilisation, for example, are
also not available.
ATTENTIO NASSIST is deactivated.
G WARNING
Th eb rake system continue 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 characteristics may be severely affec-
ted. The braking distance 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. J֌!
The red brake warning
lamp, the yellow ESP
®
and ESP ®
OFF warning
lamps and the yellow
ABS warning lamp are
lit while the engine is
running. ABS and ESP
®
are malfunctioning. For this reason, BAS PLUS,
PRE-SAFE ®
,P RE-SAFE ®
Brake, COLLISION PREVENTION ASSIST,
the HOLD function, hill start assist, crosswind driving assistance,
the adaptive brake lights and ESP ®
trailer stabilisation, for exam-
ple, are also not available.
ATTENTION ASSIST is deactivated.
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 characteristics may be severely affec-
ted. The braking distance 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. Warnin
gand indicator lam psin th einstrument cluster
329On-board computer and displays Z

Problem Possible causes/consequences and
M Solutions
÷
The yellow ESP
®
warn-
ing lam pflashes while
the vehicle is in motion. ESP
®
or trac tion con trolhas intervened because there is arisk of
skidding or at least one wheel has started to spin.
Cruise control or DISTRONIC PLU Sisd eactivated.
X Only depress the accelerator pedal as far as necessar ywhen
pulling away.
X Ac celerate more gently while the vehicle is in motion.
X Adapt your drivin gstyle to suit the road and weather conditio ns.
X Do not deactivate ESP ®
.
Exceptions: (Y page 66) å
The yello
wESP®
OFF
warning lamp is lit while
the engine is running. ESP
®
is deactivated.
G WARNING
If ESP ®
is switche doff, ESP ®
is unable to stabilis ethe vehicle.
The danger of skidding and having an accident increases.
X Reactivate ESP ®
.
Exceptions: (Y page 66)
X Adap tyour drivin gstyle to suit the road and weather conditio ns.
If ESP ®
cannot be activated:
X Have ESP ®
checked at aqualified specialist workshop. ֌
The yello
wESP®
and
ESP ®
OFF warning
lamps are lit while the
engine is running. ESP
®
,B AS PLUS, PRE-SAFE ®
,P RE-SAFE ®
Brake, COLLISION PRE-
VENTION AS SIST, the HOL Dfunction, hill start assist, crosswind
driving assistance, the adaptive brake lights and ESP ®
trailer sta-
bilisation are unavailable due to amalfunction.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above.
The braking distance in an emergency braking situation can thus
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 additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified special istworkshop. 330
Warnin
gand indicator lamps in th einstru ment clusterOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
֌
The yellow ESP
®
and
ESP ®
OFF warning
lamps ar elit while the
engine is running. ESP
®
,B AS, PRE-SAFE ®
,t he HOL Dfunction, hill start assist, cross-
wind driving assistance and ESP ®
trailer stabilisatio nare tempo-
raril ynot available.
The adaptive brake lights, COLLISION PREVENTION ASSIST, BAS
PLU Sand PRE-SAFE ®
Brake may als ohave failed.
ATTENTION ASSIST is deactivated.
Self-diagnosis is not yet complete.
G WARNING
The brake system continues to function normally, but withou tthe
func tions listed above.
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 Carefully drive on asuitable stretc hofroad, makin gslight 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. Warnin
gand indicator lam psin th einstru ment cluster
331On-board computer and displays Z

Problem Possible causes/consequences and
M Solutions
!
The red indicator lamp
for the electric parking
brake flashes or lights
up and/or the yellow
warnin glamp for the
electric parking brake
lights up. X
Observe the additional display message sint he multifunc tion
display. 6
The red SRS warning
lam
pisl it while the
engine is running. There is
amalfunction in the SRS (Supplemental Restraint Sys-
tem).
G WARNING
The airbags or belt tensioners may either be triggered uninten-
tionally or, in the event of an accident, may not be triggered.
This pose sanincrease drisk of injury.
X Driv eonc arefully.
X Have SRS checked at aqualified specialist worksho pimmedi-
ately.
For further information abou tthe Supplemental Restrain tSystem,
see (Y page 41). 332
Warnin
gand indicator lam psin th einstru ment clusterOn-board computer and displays

Engine
Problem Possible causes/consequences and
M Solutions
;
The yellow engin
ediag-
nostics warning lamp
light supw hile the
engin eisrunning. There may be
afault ,for example:
R in th eenginem anagement
R in the fuel injection system
R in the exhaust system
R in the ignition system (for vehicles with petrol engines)
R in the fuel system
The emission limit values may be exceeded and the engin emay
be runnin gine mergenc ymode.
X Hav ethe vehicl echec kedass oon as possible at aqualified
specialist workshop. Vehicle
swithad iesel engine: th efuel tan khas been run dry
(Y page 177).
X Start the engin ethre etof our times after refuelling.
If th eyellow engin ediagnostics warning lamp goes out ,emer-
ge ncyr unnin gmodeisc ancelled. The vehicle need not be
checked. 8
The yellow
reserve fuel
warnin glam pligh ts up
whil ethe engine is run-
ning. The fu
ellevel ha sdropp edinto the reserv erange.
Operatio nofthe auxiliary heatin gisdeactiv ated when the fuel level
drops into the reserve ran ge.
X Refue latthe nearest filling stat ion. ?
The red coolant warn-
ing lamp light
supwhile
the engine is running
and the coolant tem-
perature gaug eisatthe
start of the scale. The temperature senso
rfor the coolant temperatur egauge is
faulty.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine. Do not continue driving
under any circumstances.
X Secure the vehicle against rolling away (Y page 181).
X Consult aqualified specialist workshop. Warnin
gand indicator lam psin th einstru ment cluster
333On-board computer and displays Z