differential MERCEDES-BENZ G-CLASS SUV 2012 User Guide

cruise control lever in the direction of arrow
B.
LIM indicator lamp =on the cruise control
lever indicates which function you have selec-
ted:
R LIM indicator lamp = off:
DISTRONIC
PLUS is selected.
R LIM indicator lamp = on:
variable
SPEEDTRONIC is selected.
Activating DISTRONIC PLUS Activation conditions
To activate DISTRONIC PLUS, the following
conditions mus
tbe fulfilled:
R the engine must be running. It may take up
to two minutes of driving before DIS-
TRONIC PLUS is ready for use.
R the parking brake must be released.
R the differential lock must be deactivated.
R ESP ®
must be switched on, but not inter-
vening.
R the transmission must be in position D.
R the driver's door must be closed when you
shift from Pto Dor your seat belt must be
fastened.
R the front-passenger door and the rear
doors must be closed.
R the vehicle must not be skidding.
R the DISTRONIC PLUS function must be
selected (Y page 183).
R the transfer case must be in the HIGH
RANGE transmission position.
R the vehicle must not be on an uphill or
downhill gradient of more than 22-25%.
R the radar sensor must be free from dirt
(Y page 298). Activating while driving When driving at speeds below 30 km/h, you
can activate DISTRONIC PLUS if the vehicle
in fron
thas been detected and is shown in the
multifunction display. If the vehicle in fron tis
no longe rdetected and displayed, DIS-
TRONIC PLUS switches off and you will hear
a tone.
X Briefly pull the cruise control lever towards
you ?, or press it up :or down A.
DISTRONIC PLUS is selected.
X Press the cruise control lever up :or
down Arepeatedly until the desired speed
is set.
X Remove your foot from the accelerator
pedal.
Your vehicle adapts its speed to that of the
vehicle in front, but only up to the desired
stored speed.
i If you do not fully release the accelerator
pedal, the DISTRONIC PLUS inactive message appears in the multifunction dis-
play. The set distance to a slower-moving
vehicle in fron
twill the nnot be maintained.
You will be driving at the speed you deter-
mine by the position of the accelerator
pedal. 184
Driving systemsDriving and parking

Differential lock
General notes G
WARNING
Whe ndifferential locks are engaged on a firm,
high-grip surface, the vehicle's steerability is
greatly impaired .Inparticular, engaging the
differential locks when cornering could lead
to you losing control of the vehicle .There is a
risk of an accident.
Disengage the differential locks immediately
on firm, high-grip surfaces.
! To prevent damage in the transfer case,
you may only operate the vehicle on a roller
dynamometer (single-axle roller dynamom-
eter) if:
R the axle that is not being driven is raised.
or
R the corresponding propeller shaft is dis-
connected and the transfer case differ-
ential lock is activated.
Otherwise, the transfer case can be dam-
aged.
Differential locks improve the traction of the
vehicle.
Your vehicle is equipped with adifferential
lock for:
R the transfer case: this controls the balance
between the front and rear axles.
R the rear axle: this controls the balance
between the wheels on the rear axle.
R the front axle: this controls the balance
between the wheels on the front axle.
Activating the differentia llock Important safety notes
G
WARNING
When differential locks are engaged on a firm,
high-grip surface, the vehicle's steerability is
greatly impaired. In particular, engaging the
differential locks when cornering could lead to you losing control of the vehicle
.There is a
risk of an accident.
Disengage the differential locks immediately
on firm, high-grip surfaces. G
WARNING
ABS, 4ETS, ESP ®
and BAS are deactivated
while the differential locks are engaged. As a
result, the wheels could lock when braking
and the braking distance is increased. There
is a risk of an accident.
Disengage the differential locks immediately
on firm, high-grip surfaces.
! Only activate the differential locks when:
R you are driving at walking pace.
R the driven wheels are not spinning.
R you are not driving on a firm road surface.
General notes
The switches are located on the centre con-
sole. :
Function indicator lamps (red)
; Differential lock for the front axle
= Differential lock for the transfer case
? Differential lock for the rear axle
A Activation indicator lamps (yellow)
Activate the differential locks:
R off-road
R to deactivate ABS, 4ETS, ESP ®
and BAS
when off-road
R when fording 204
Off-road driving systemsDriving and parking

For further information on driving off-road,
see (Y page 169).
i You can only engage the differential locks
if the transfer case is in the LOW RANGE
off-road driving positio n(Ypage 201).
i You can activate the differential locks in
the following order =,?,;.
Differential lock for the transfer case X
To engage: switch the transfer case to the
LOW RANGE off-road driving position
(Y page 202).
X Press switch =.
When the transfer case is in the LOW
RANGE off-road driving position, the yellow
activation indicator lamp below switch =
lights up.
The å warning lamp in the instrument
panel lights up.
When the differential is locked, the red
function indicator lamp above switch =
lights up.
The following message appears in the mul-
tifunction display:
ABS not available differential locked
The
å!÷ warning lamps in the
instrument cluster light up.
The differential lock for the transfer case is
engaged.
4ETS, ESP ®
, BASa nd ABS ar edeactivated.
The vehicle's ability to steer is severely
restricted. Drive carefully and accelerate gen-
tly for optimum traction.
i You can now engage the differential lock
for rear axle ?and the differential lock for
front axle ;as required. Differential lock for the rear axle X
To engage: press switch ?.
Yellow activation indicator lamp Alights
up first, followed by red function indicator
lamp :of switch ?.
The differential lock for the rear axle is
engaged.
Differential lock for the front axle X
To engage: press switch ;.
The yellow activation indicator lamp lights
up first, followed by the red function indi-
cator lamp.
The differential lock for the front axle is
engaged.
Deactivating the differential lock You can deactivate the differential locks in
this order:
;,?,=.
X To simultaneously deactivate all differ-
ential locks: press switch=.
Yellow activation indicator lamps Aand
red function indicator lamps :go out.
After approximately three seconds of nor-
mal driving, ABS, 4ETS, ESP ®
and BAS are
activated.
The ABS not available differential
locked message disappears from the mul-
tifunction display and the å,!and
÷ warning lamps in the instrument clus-
ter go out.
X Shift the transfer case to the HIGH
RANGE on-road position (Y page 202).
If red function indicator lamps :do not go
out when deactivating the differential locks:
X Observe the traffic situation.
X While driving, make some gentle steering
movements.
Red function indicator lamps :go out as
soon as the differential locks have been
disengaged. Off-road driving systems
205Driving and parking Z

Display messages Possible causes/consequences and
M Solutions
TC shift condition
not fulfilled
Engage NEUTRAL gear You have not met one or more shift conditions.
X
Shift the automati ctransmission to neutral position N.
X Repeat the gearshift process. TC shift condition
not fulfilled
Drive at max.
70 km/h You have exceeded the maximu
mspeed for the gearshift process.
X Drive more slowly.
X Repeat the gearshift process. LOW RANGE
On The transfer case is in the
LOW RANGEoff-road position. HIGH RANGE
On The transfer case is in the
HIGH RANGEon-road position. Differential locks
available only in
LOW RANGE The LOW RANGE button has been pressed. The transfer case is in
the
LOW RANGE off-road driving position and a differential lock
is engaged.
X Disengage the differential locks (Y page 204).
X Repeat the gearshift process. TC-NEUTRAL
On The transfer case is in the
Neutralneutral position.
Aw arning tone will also sound when the driver's door is opened
and the brake pedal is no tdepressed.
X Close the driver's door.
X Secure the vehicle against rolling away (Y page 163).
X Shift the transfer case according to driving conditions
(Y page 201). Preselected dif‐
ferential lock
ESP not available Ad
ifferential lock has been engaged. The differential gear has not
yet locked the respective differential. The activation indicator
lamp (yellow) ( Ypage 204) of the switch lights up.
ESP is unavailable.
AB Sis still available. Differential locks
active
ABS and ESP
unavailable Ad
ifferential lock was engaged and the differential gear has
locked the respective differential. The activation indicator lamp
(yellow) and function indicator lamp (red) (Y page 204) on the
switch light up.
AB Sa nd ESP are unavailable. 242
Display messagesOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
!
The red ABS warning
lamp is lit while the
engine is running. A
warning tone also
sounds.
EBD is faulty. Therefore, ABS, BAS, ESP
®
, the HOLD function, hill
start assist, the adaptive brake lights and ESP ®
trailer stabilisation
are also not available, for example.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The front and rear wheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit a qualified specialist workshop. !
The red ABS warning
lamp is lit while the
engine is running.
You have engaged the differential locks. ABS is deactivated.
X
Disengage the differential locks.
Subsequently ABS is reactivated. J֌!
The yellow brake warn-
ing 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. Therefore, BAS, EBD, the HOLD
function, hill start assist, the adaptive brake lights and ESP ®
trailer
stabilisation, for example, are also not available.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The front and rear wheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit a qualified specialist workshop. 256
Warning and indicator lamps in the instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
֌
The yellow ESP
®
and
ESP ®
OFF warning
lamps are lit while the
engine is running. ESP
®
, BAS, the HOLD function, hill start assist and ESP ®
trailer
stabilisation are temporarily unavailable.
BAS and the adaptive brake lights may also have failed.
Self-diagnosis is not yet complete.
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 stabilise the vehicle.
The danger of skidding and having an accident increases.
X Carefully drive on a suitable stretch of road making slight steer-
ing movements at a speed 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 a qualified specialist workshop. å
The yellow ESP
®
OFF
warning lamp is lit while
the engine is running. You have engaged the differential locks. ABS, ESP
®
,4 ETS and BAS
have been deactivated.
X Disengage the differential locks.
ESP ®
, 4ETS and BAS ar esubsequently reactivated.
X Observe the additional display messages in the multifunction
display. 258
Warning and indicator lamps in the instrument clusterOn-board computer and displays