Problems with SPEEDTRONIC
The speed cannot be set when SPEEDTRONIC is
activated.
The display is showing a message of high priority
and cannot therefore show a change in speed.
X
Proceed as instructed by the message in the
display.
All-wheel drive
General notes
4x4 all-wheel drive ensures permanent drive for
all four wheels, and together with ESP
®
it
improves the vehicle's traction.
If a driven wheel spins due to lack of traction:
R
When pulling away, make use of the traction
control integrated in ESP
®
. Depress the
accelerator pedal as far as necessary.
R
While driving, slowly take your foot off the
accelerator pedal
Use winter tyres (M+S tyres), with snow chains
if necessary, when the conditions are wintry
(Y page 357). This is the only way to get the full
benefit from the all-wheel drive system.
Use DSR (Downhill Speed Regulation) when
driving downhill off-road (Y page 192).
You will find information on driving on unpaved
surfaces under "Driving off-road" (Y page 183).
Important safety notes
If you fail to adapt your driving style or if you are
inattentive, the permanent 4x4 all-wheel drive
can neither reduce the risk of an accident nor
override the laws of physics. The 4x4 all-wheel
drive system cannot take road, weather and
traffic conditions into account. The 4x4 all-
wheel drive system is only an aid. You are
responsible for the distance to the vehicle in
front, for vehicle speed, for braking in good time
and for staying in lane.
!
A function or performance test should only
be carried out on a twin-axle dynamometer.
Before you operate the vehicle on such a
dynamometer, please consult a qualified
workshop. You could otherwise damage the
drive train or the brake system.
!
Never tow the vehicle with one axle raised.
This may damage the transfer case. Damage
of this sort is not covered by the Mercedes-
Benz implied warranty. All wheels must
remain either on the ground or be fully raised.
Observe the instructions for towing the vehi-
cle with all wheels in full contact with the
ground.
You can find information on towing away under
"Tow-starting and towing away" (Y page 353).
DSR (Downhill Speed Regulation)
General notes
On vehicles with 4x4 all-wheel drive, DSR can be
activated as assistance when driving downhill
off-road. DSR maintains a set speed for you on
downhill gradients by applying the brakes as
required. The steeper the gradient is, the more
DSR causes the vehicle to brake. On flat terrain
or going uphill, DSR hardly brakes or does not
brake at all.
You can set the stored speed to between
4 km/h and 18 km/h using the brake and accel-
erator pedals or the cruise control lever. You can
drive below or exceed the set speed at any time
by braking or accelerating.
DSR is activated but not active if you drive faster
than 18 km/h off-road. DSR remains activated,
but does not brake automatically. If you subse-
quently drive slower than 18 km/h, DSR brakes
automatically until the set speed is reached.
If you drive faster than 45 km/h, DSR switches
off automatically.
Important safety notes
G
WARNING
If the speed driven and the set speed deviate
and you activate DSR on a slippery road sur-
face, the wheels may lose traction. This
increases the risk of skidding and having an
accident.
Before switching DSR on, please take into
consideration the road surface and the differ-
ence between driving speed and the set
speed.
If you fail to adapt your driving style, the driving
safety systems can neither reduce the risk of
accident nor override the laws of physics. DSR
cannot take road, weather and traffic conditions
192
Driving systems
Driving and parking
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