Acceleration Skid Control (Asr); Warning Lamp - Mercedes-Benz Vito Operating Instructions Manual

Acceleration skid control (ASR)

ASR improves traction, i.e. the transfer of
power from the tyres to the road surface,
for a sustained period and thus also im-
proves the driving stability of the vehicle.
ASR assists you when pulling away and ac-
celerating, especially on smooth and slip-
pery surfaces.
ASR brakes individual drive wheels and
limits the engine torque to prevent the
drive wheels from spinning. When ASR in-
tervenes, the v warning lamp in the in-
strument cluster flashes.
If the road surface is not capable of provid-
ing sufficient traction, bearing in mind the
tyres, load and gradient, it is not possible
to start off smoothly even with ASR.
On vehicles without steering wheel but-
tons, there is a malfunction when the
k warning lamp lights up constantly
while the engine is running (
If ASR malfunctions, engine power output
may be reduced.
To deactivate/activate ASR
ASR is automatically activated when the
engine is switched on.
It may be best to deactivate ASR in the fol-
lowing situations:
I if snow chains are being used
I in deep snow
I on sand or gravel
If you deactivate ASR:
I the engine torque is not restricted and
the drive wheels can spin, cutting into
the surface for better traction
I traction control still intervenes by brak-
ing if one drive wheel reaches its grip
limit, e.g. if the surface under one side
of the vehicle is slippery. The wheel is
then braked to increase traction in this
situation.
®
ESP still intervenes to stabilise the ve-
I
hicle
G
Risk of accident
e page 270). ®
ESP remains active despite ASR having
been deactivated and carries out braking in-
terventions if this is necessary to improve
driving stability. The v warning lamp
flashes.
If ASR is deactivated, there is an increased
risk that the brake system of your vehicle
could overheat and be damaged when sub-
Nur fuer internen Gebrauch
Operating the vehicle
jected to high loads for a long period of
time. A hot brake system also increases the
stopping distance.
For this reason, only deactivate ASR when it
is absolutely necessary.
The ASR switch is located on the centre
console.
1 To deactivate/activate ASR
E To switch off: press upper section 1
of the switch.
The v warning lamp in the instru-
ment cluster goes on.
E To switch on: press upper section 1
of the switch again.
The v warning lamp in the instru-
ment cluster goes off.
Controls
3
ee
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