BMW X5 4.8is SAV 2004 - Manual (Page 102)

100 n Flat Tire Monitor
The concept
The Flat Tire Monitor keeps track of the
inflation pressures in the four fitted tires
as you drive. The system provides an
alert whenever the inflation pressure
drops significantly in relation to the
pressure another tire.
The check of the tire inflation pressure
is based on monitoring the relative
speeds of the wheels. A flat is detected
and reported on the basis of a deviation
in certain speed ratios.
Functional requirement
To ensure reliable operation, the sys-
tem should have been initialized with
the correct tire inflation pressure.
System limits
The Flat Tire Monitor cannot indi-
cate sudden severe tire damage
caused by outside factors and does not
detect a natural, even pressure drop in
all four tires.
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In the following situations, the system
could be delayed or malfunction:
> When driving on snow-covered or
slippery road surfaces
> In the case of performance-oriented
driving: slip on the drive wheels, high
lateral acceleration
> False alarms and undetected loss of
pressure may occur when you are
driving with snow chains fitted.
Initializing system
Perform the initialization immedi-
ately every time you correct the
inflation pressure, change a tire or
change a wheel or all wheels. A drive
is required for this purpose.
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1. Start the engine, but do not drive off
2. Press the button until the yellow indi-
cator lamp in the instrument cluster
lights up for a few seconds
3. Drive off.
It takes a few minutes of driving until
the Flat Tire Monitor can detect and
indicated a flat tire.
When driving with snow chains,
do not initialize the system.
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