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Acceleration Slip Control (ASR)
The acceleration slip control will engage
at all vehicle speeds, if one or both drive
wheels begin to lose traction and spin.
While engaged, the yellow function
indicator in the speedometer lights up.
With the acceleration slip control engaged,
the brake is applied to the spinning drive
wheel until it regains sufficient traction.
If both drive wheels lose traction and spin,
the brake is applied to both drive wheels
and simultaneously, engine torque is
limited.
As traction on the road surface increases,
the allowable engine torque also increases
again and the brake is no longer applied to
drive wheels.
Caution!
If the vehicle is towed with the front
axle raised (see Towing the vehicle in
Index), the key must not be in
steering lock position 2. Otherwise,
the acceleration slip control will
immediately be engaged and will
apply the rear wheel brakes.
Notes:
With the key in steering lock position
2, the yellow function indicator lamp
and the yellow ASR warning lamp in
the instrument cluster come on. They
must go out when the engine is
running.
If the ASR warning lamp comes
on with the engine running, a
malfunction has been detected.
Pressing the accelerator pedal will
require greater effort. Only partial
engine output is available.
Have the acceleration slip control
checked at your authorized Mercedes-
Benz dealer as soon as possible.
Driving the vehicle with varied size
tires will cause the wheels to rotate at
different speeds, therefore the
acceleration slip control will activate
(yellow ASR function indicator lamp in
instrument cluster 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 key must
not be in steering lock position 2.
Otherwise, the acceleration slip control
will immediately be engaged and will
apply the rear wheel brakes.
In winter operation, the maximum
effectiveness of the acceleration slip
control is only achieved with
Mercedes-Benz recommended M + S
radial-ply tires.
The brake pad wear warning lamp
indicates brake pad wear for the front
as well as the rear brakes.