Operation Manual

217Driving and operation
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Deflation detection system
(DDS = Deflation Detection System) 3
The deflation detection system
continuously monitors the speed of all
wheels while driving. If a tyre loses
pressure, it grows smaller and rotates more
quickly than the other wheels. If the system
detects a difference in speed, control
indicator w illuminates red.
Stop immediately and check tyre pressure.
Mount the spare wheel if necessary – see
pages 249, 252.
The system is operational when the ignition
is switched on and can detect pressure loss
from a speed of 20 mph (30 km/h).
Control indicator w
If control indicator w illuminates red while
driving, there is a loss of pressure. Stop
immediately and check tyre pressures.
Amaximum speed of 50 mph (80km/h) is
permitted for run-flat tyres 3. Observe the
information on page 229.
If the control indicator w illuminates yellow,
there is a fault in the system. Have the
cause of the fault eliminated by a
workshop. The self-diagnosis integrated
into the system facilitates rapid fault
identification.
The control indicator flashes three times
when the system is initialising.
Tyre pressure – see pages 225, 337.
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System initialisation
After correcting tyre pressure or changing
a tyre/wheel, the system must be initialised:
With the ignition switched on, press the
DDS button for approx. 4 seconds. Control
indicator w flashes 3 times. The system is
operational after driving a certain
distance.
Only initialise the system if all tyres have
the prescribed pressure.
9 Warning
The deflation detection system does not
replace manual checks with a suitable
gauge.
Check tyre pressures at least every
14 days and prior to any long journey;
the tyres should be checked when cold.
Don’t forget to check the spare3.