BMW 530XD - Manual (Page 89)

Tech
nic
al featu
res fo
r dr
iving comfort and
safety
88
Indication of a flat tyre
The warning lamp shows red. A mes-
sage appears on the control display. An
acoustic signal also sounds. There is a
flat tyre or substantial loss of tyre pressure.
1. Reduce your speed and stop the car care-
fully. Avoid violent or sudden braking and
steering manoeuvres.
2. Identify the damaged wheel.
If you are unable to identify where the
problem lies, contact BMW Service.
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3. Change the wheel with the damaged tyre,
see Changing a wheel, page
196 .
Run-flat tyres*
1. Carefully reduce your speed to no more
than 80 km/h, approx. 50 mph. Avoid violent
or sudden braking and steering manoeu-
vres. Do not exceed a speed of 80 km/h,
approx. 50 mph, after this.
If the car is not fitted with run-flat
tyres, see page
183 , do not continue
your journey, as driving on a flat tyre could
result in a serious accident.
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2. Check the pressure in all four tyres at the
next opportunity.
If all four tyres are inflated to the cor-
rect pressures, the Run Flat Indicator
might not have been initialised. Initialise the
system.
<
3. If a tyre is completely deflated, you can esti-
mate how far you will be able to drive using
the following guidelines:
> With low loads:
1 to 2 persons, without luggage:
approx. 250 km, approx. 155 miles
> With moderate loads:
2 persons, luggage compartment or load
area full, or 4 persons without luggage:
approx. 150 km, approx. 90 miles
> With full load:
4 persons or more, luggage compart-
ment or load area full:
approx. 50 km, approx. 30 miles
Drive with caution and do not exceed
80 km/h, approx. 50 mph. If there is a loss
of tyre pressure, the car's handling properties
will change. These include reduced track stabil-
ity during braking, longer braking distances and
altered self-steering properties.
If unusual vibration or loud noises occur during
the journey, this may be an indication that the
damaged tyre has finally failed. Reduce your
speed and pull over to a suitable location as
soon as possible. Otherwise, parts of the tyre
could come loose, which could result in an acci-
dent. Do not drive the car any further; contact
BMW Service instead.
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Active steering*
Principle
Active steering is a system which actively varies
the steering lock of the front wheels in relation
to steering wheel movements.
At low speeds, e.g. in built-up areas or when
parking, the steering lock is accentuated, i.e.
the steering response becomes very direct. At
higher speeds, on the other hand, the steering
lock is gradually reduced. This improves the
handling of your BMW across the entire speed
range.
In critical situations, the system can specifically
correct the angle through which the driver has
turned the wheels, and thus to stabilise the car
before the driver starts to take corrective action.
This stability-enhancing action is deactivated
when DSC is shut down, see page
84 .
Malfunction
The warning lamp lights up and a mes-
sage appears on the control display:
the active steering is faulty and deacti-
vated. At low speeds, more pronounced move-
ment of the steering wheel is required, whereas
the car will respond more sensitively to steering
wheel movements at higher speeds. The stabil-
ising intervention may also be deactivated.
Drive cautiously and think well ahead. Have the
system checked.
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