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Controls
Operation
Maintenance
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Unforeseen driving situations often
call upon the driver to react swiftly by
taking corrective steering action. The
vehicle may be felt to respond in a
surprising or unpredictable manner as
a result. The ARK system modifies or
prevents such reactions.
At a speed of app. 40km/h (app.
25 mile/h) or above, the ARK is acti-
vated with every movement of the
steering wheel; it modifies the rear
wheel lock angle and repositions the
rear wheels ideally to suit the driving
situation.
The optimum rear-wheel angle is cal-
culated from the steering wheel's
momentary lock angle and the vehi-
cle's road speed; the wheel angles
are then adjusted by the electro-
hydraulic control circuit. As a result of
the vehicle's increased stability, it
responds more predictably to steering
wheel movements.
However, these improved driving char-
acteristics cannot overcome the basic
laws of physics to which a moving
vehicle is subject. It remains the
driver's responsibility not to initiate
excessive steering-wheel movements
or go beyond safe cornering speeds.
Each time the engine is started, the
ARK control unit runs through a self-
check sequence. In the event of a sys-
tem fault, which will be indicated by
the telltale light in the instrument clus-
ter and the display R/AXLE FAILSAFE
PROG in the MID, the lock angle of
the rear wheels will no longer be
adjusted. The wheels will normally
remain in the straight-ahead position,
with the result that the vehicle can be
driven normally. In exceptional cases,
the wheels could remain locked at an
angle. If this occurs, the steering
wheel will be slightly offset to com-
pensate when the vehicle is travelling
in a straight line. Here again, the vehi-
cle can still be driven normally. Note,
however, that in this situation the rear
wheels will run slightly off-track and
the vehicle will occupy marginally
more road space across its width as a
result.
Minor, temporary faults can be recti-
fied by starting the engine again to ini-
tiate the system's self-check. If the
telltale light does not go out even after
the engine is restarted, contact BMW
Service to have the system repaired.
Active Rear Axle Kinematics (ARK)*
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
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