2012 MERCEDES-BENZ G-CLASS SUV coolant

Displays and operation
Instrument cluster
Instrument cluster: kilometres
:
Speedometer with segments (Y page 212)
; Multifunction display (Y page 214)
= Rev counter (Y page 212)
? Coolant temperature ( Ypage 212)
A Fuel gauge
B Instrumen tcluster lighting (Y page 212) Instrument cluster: miles
:
Speedometer with segments (Y page 212)
; Multifunction display (Y page 214) Displays and operation
211On-board computer and displays Z

=
Rev counter (Y page 212)
? Coolan ttemperature (Y page 212)
A Fuel gauge
B Instrument cluster lighting (Y page 212)Instrument cluster lighting
The lighting in the instrument cluster, in the
displays and the controls in the vehicle inte-
rior can be adjusted using the brightness con-
trol knob.
The brightness control knob is located on the
bottom left of the instrument cluster
(Y page 211).
X Turn the brightness control knob clockwise
or anti-clockwise.
If the light switch is set to Ã,Tor
L, the brightness is dependen tupon
the brightness of the ambient light.
i The light senso rinthe instrumentc luster
automatically controls the brightness of
the multifunction display.
In daylight, the displays in the instrument
cluster are not illuminated. Displaying the coolant temperature
The coolan ttemperature gauge is in the
instrument cluster on the right-hand side
(Y page 211).
The reading may rise up to 120 †undernor-
mal driving conditions if the coolant has been
filled correctly.
At high outside temperatures and when driv-
ing uphill, the coolant temperature may rise
to the end of the scale. Rev counter
! Do not drive in the overrevving range.
Doing so will damage the engine.
The red band in the rev counter indicates the
engine's overrevving range. The fuel supply is interrupted to protec
tthe
engine when the red band is reached. Outside temperature display
G
WARNING
At temperatures just above freezing point, the
street may be icy, especially in wooded areas
or on bridges. If you do not adapt your driving
style to the conditions, the vehicle could skid.
For this reason, adapt your driving style and
speed to the weather conditions.
The outside temperature displayi s in the mul-
tifunction display (Y page 214).
Changes in the outside temperature are dis-
played after a short delay. Speedometer with segments
The segments in the speedometer indicate
which speed range is available.
R Cruise control activated (Y page 173):
The segments light up from the stored
speed to the maximum speed.
R Variable SPEEDTRONIC activated
(Y page 178):
The segments light up from the start of the
scale to the selected limit speed.
R DISTRONIC PLUS activated (Y page 184):
One or two segments in the set speed
range light up.
R DISTRONIC PLUS detects avehicle in front:
The segments between the speed of the
vehicle in fron tand the stored speed light
up. 212
Displays and operationOn-board computer and displays

Switching the fold-in mirrors when lock-
ing function on/off
When you activate the
Auto. fold in mir‐
rors function, the exterior mirrors are folded
in when the vehicle is locked. When you
unlock the vehicle and then open a door, the
exterior mirrors fold out again.
X Press the =or; button on the steer-
ing wheel to select the Settings menu.
X Press the :or9 button to select the
CONVENIENCE submenu.
X Press ato confirm.
X Press :or9 to select the Auto. fold in mirrors function.
If the Auto. fold in mirrors function is
activated, the vehicle's exterior mirror is
displayed in red in the multifunction dis-
play.
X Press the abutton to save the setting. :
To fold the exterior mirrors in or out
If you have switched the Auto. fold-infunction on and you fold the exterior mirrors
in using button :, they will not fold out auto-
matically (Y page 99).
You can then only fold out the exterior mirrors
using button :. Resetting to factory settings
X Press the =or; button on the steer-
ing wheel to select the Settings menu.
X Press the :or9 button to select the
Factory settings submenu.X
Press ato confirm.
The Reset all settings? message
appears.
X Press the :or9 button to select
No or
Yes .
X Press the abutton to confirm the selec-
tion.
If you have selected Yes , the multifunction
display shows a confirmation message.
For safety reasons, not all functions are reset:
the Limit speed (winter tyres) function
in permanent SPEEDTRONIC can only be set
in the Vehicle submenu. If you want to reset
the Daytime driving lights in the
Light submenu, you must turn the key to position
1(Y
page 143) in the ignition lock. AMG menu in AMG vehicles
AMG displays :
Digital speedometer
; Gear indicator
= Upshift indicator
? Engine oil temperature
A Coolant temperature
B Status indicator for ECO start/stop func-
tion (Y page 145)
X Press =or; on the steering wheel
to select the AMG menu.
Upshift indicator UP =
indicates that the
engine has reached the overrevving range
when in the manual gearshift program.
Upshift indicator UP =
fades out other mes-
sages until you have shifted up.
If the engine oil temperature is below 80 †,
the oil temperature is shown in blue. Avoid Menus and submenus
225On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
b
Remove key You have lef
tthe key in the ignition lock.
X Remove the key from the ignition lock. b
Switch off lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to Ã.Engine
Display messages Possible causes/consequences and
M Solutions
+
Top
up coolant See
Owner's Manual The coolant level is too low.
X
Top up the coolant, observing the warning notes before doing
so (Y page 293).
X Have the coolant system checked at a qualified specialist work-
shop if the coolant needs topping up more often than usual. ? The fan motor is faulty.
X
If the coolant temperature is below 120 †, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in
mountainous terrain and stop-start traffic. Display messages
237On-board computer and displays Z

Display messages Possible causes/consequences and
M Solutions
?
Coolant Stop vehi‐
cle Switch engine
off The coolan
tis too hot.
Aw arning tone also sounds.
G WARNING
Never drive with an overheated engine. Driving when your engine
is overheated can cause som efluids which may have leaked into
the engine compartment to catch fire.
Steam fro manoverheated engine can cause serious burns which
can occur just by opening the bonnet.
There is a risk of injury.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 163).
X Leave the vehicle and keep a safe distance from the vehicle until
the engine has cooled down.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by frozen slush.
X Do not start the engine again until the display message goes out
and the coolant temperature is below 120 †. The engine may
otherwise be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visi taqualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 120 †. The poly-V-belt may have torn.
X
Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switc hoff the engine.
X Check the poly-V-belt.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X Consult a qualified specialist workshop.
If the poly-V-belt is OK:
X Wai tuntil the display message disappears before restarting the
engine .The engine may otherwise be damaged.
X Pay attention to the coolant temperature display.
X Visit a qualified specialist workshop. 238
Display messagesOn-board computer and displays

Display messages Possible causes/consequences and
M Solutions
Telephone No
service Your vehicle is outside the network provider's transmitter/
receiver range.
X
Wait until the mobile phone operational readiness symbol
appears in the multifunction display. ¥
Top
up washer fluid The washer fluid level in th
ewasher fluid reservoir has dropped
below the minimum.
X Top up the washe rfluid (Y page 294). Key
Displa
ymessages Possible causes/consequences and
M Solutions
Â
Key does not
belong to vehicle You have put the wrong key in the ignitio
nlock.
X Use the correct key. Â
Replace key The key needs to be replaced.
X Visit a qualified specialist workshop. Warning and indicator lamps in the
instrument cluster Warning and indicator lamps over-
view
L Dipped-beam headlamps
(Ypage 105)
T Side lamps (Y page 105)
#! Turn signals (Y page 108)
K Main-beam headlamps
(Ypage 109)
N Foglamps (Y page 106)
R Rear fog lamp (Y page 107)
ü Seat belts (Y page 252)
J Brakes (yellow) (Y page 253)
J Brakes (red) (Y page 253)
! ABS (Ypage 254)
÷ ESP®
(Y page 256)
å ESP®
OFF (Y page 256) 6
SRS (Ypage 259)
; Engine diagnostics
(Ypage 259)
8 Reserve fuel (Y page 260)
? Coolant (Ypage 260)
· Distance warning signal
(Ypage 262)
% Diesel engine: preglow
(Ypage 144)
h Tyre pressure monitor
(Ypage 263) Warning and indicator lamps in the instrument cluster
251On-board computer and displays Z

Problem Possible causes/consequences and
M Solutions
8
The yellow reserve fuel
warning lamp lights up
while the engine is run-
ning.
The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated when the fuel level
drops into the reserve range.
X
Refuel at the nearest filling station. %
On diesel engine vehi-
cles, the preglow indi-
cator lamp does not
light up when the key is
in position
2(Y
page 143). The preglow system is malfunctioning.
X
Visit a qualified specialist workshop immediately. ?
The red coolant warn-
ing lamp lights up while
the engine is running
and the coolant tem-
perature gauge is at the
start of the scale.
The temperature sensor for the coolant temperature gauge 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 Engage the parking brake.
X Consult a qualified specialist workshop. 260
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
?
The red coolant warn-
ing lamp comes on
while the engine is run-
ning.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator
may be blocked or the electric engine radiator fan may be mal-
functioning.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X
Observe the additional display messages in the multifunction
display.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Engage the parking brake.
X Leave the vehicle and keep a safe distance from the vehicle until
the engine has cooled down.
X Check the coolant level and top up the coolant, observing the
warning notes (Y page 293).
X If you have to top up the coolant frequently, have the engine
cooling system checked.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by frozen slush.
X Do not start the engine again until the coolant temperature is
below 120 †. The engine may otherwise be damaged.
X Drive to the nearest qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in moun-
tainous terrain, and stop-start driving. ?
The red coolant warn-
ing lamp comes on
while the engine is run-
ning. A warning tone
also sounds.
The coolant temperature has exceeded 120 †. The airflow to the
engine radiator may be blocked or the coolant level may be too
low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Never drive with an overheated engine. Driving when your engine
is overheated can cause some fluids which may have leaked into
the engine compartment to catch fire.
Steam from an overheated engine can cause serious burns which
can occur just by opening the bonnet.
There is a risk of injury.
X Observe the additional display messages in the multifunction
display.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 163).Warning and indicator lamps in the instrument cluster
261On-board computer and displays Z