Mercedes-Benz E 320 Wagon 1999 ASR - Manual (Page 3)

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Acceleration Slip Regulation (ASR)
The acceleration slip regulation will
engage at all vehicle speeds, if one or
both drive wheels begin to lose
traction and spin in acceleration.
While engaged, the yellow warning
lamp in the speedometer dial flashes.
With the ASR engaged, the brake is
applied to the spinning drive wheel
until slip is brought under control. If
both drive wheels spin, the brake is
applied to both drive wheels and
simultaneously, engine torque is
limited, to improve the vehicle's
driving stability.
As traction on the road surface
increases, thus allowing acceleration
without slip, the allowable engine
torque also increases again and the
brake is no longer applied to drive
wheels.
Important!
If the ASR warning lamp flashes, adapt
your speed and driving to the
prevailing road conditions.
Caution!
If the vehicle is towed with the front
axle raised (see Towing the vehicle in
Index), the engine must be shut off
(electronic key in steering lock position
0 or 1). Otherwise, the ASR will
immediately be engaged and will apply
the rear wheel brakes.
Notes:
The malfunction indicator lamp for the
ASR is combined with that of the BAS.
The yellow BAS/ASR malfunction
indicator lamp in the instrument cluster
and the yellow ASR warning lamp in
the speedometer dial come on with the
electronic key in steering lock position
2. They should go out with the engine
running.
If the BAS/ASR malfunction indicator
lamp comes on with the engine running,
a malfunction has been detected in
either system. Pressing the accelerator
pedal will require greater effort. Only
partial engine output will be available.
If the BAS malfunctions, the brake
system functions in the usual manner,
but without BAS.
Have the BAS or ASR checked at your
authorized Mercedes-Benz dealer as
soon as possible.
With the ABS malfunctioning, the
ASR is also switched off.
Driving the vehicle with varied size
tires will cause the wheels to rotate at
different speeds, therefore the ASR
may activate (yellow ASR warning
lamp in speedometer dial comes on).
For this reason, all wheels, including
the spare wheel, must have the same
tire size.
When testing the parking brake on a
brake test dynamometer, the engine
must be shut off. Otherwise, the ASR
will immediately be engaged and will
apply the rear wheel brakes.
In winter operation, the maximum
effectiveness of the ASR is only
achieved with Mercedes-Benz
recommended M+S rated radial-ply
tires and/or snow chains.