2012 MERCEDES-BENZ GL SUV brake

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

Warnin
gand indicator lamps in the
instrument cluster Warning and indicator lamps over-
view
L Dipped-beam headlamps
(Ypage 120)
T Side lamps (Y page 119)
K Main-beam headlamps
(Ypage 122)
#! Turn signals (Y page 121)
R Rear foglamp (Y page 120)
ü Seat belts (Y page 325)
J Brakes (Ypage 326)
! ABS(Ypage 32 7)
÷ ESP®
(Y page 329)
å ESP®
OFF (Y page 329)
! Electric parking brake (red)
(Ypage 332)
! Electric parking brake (yellow)
(Ypage 332)
6 SRS (Ypage 332)
; Engine diagnostics
(Ypage 333)
8 Reserve fuel (Y page 333)
? Coolant (Ypage 333)
· Distance warning function
(Ypage 335)
% Diesel engine: preglow
(Ypage 161)
h Tyre pressure monitor
(Ypage 336) 324
Warning and indicator lamp
sintheinstrument clusterOn-boar dcomputer and displays

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