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available. See your BMW Sports Activity
Vehicle Center to have the system
repaired.
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 sig-
nificantly 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 tire is detected and
reported on the basis of a deviation in cer-
tain speed ratios.
Functional requirement
So that the Flat Tire Monitor can learn the
correct inflation pressure, please perform
the following:
1.
Check the inflation pressures in all tires
2.
Compare with the inflation pressure
table on page
87
sary
3.
Initialize the system.
Limits of the system
The Flat Tire Monitor cannot indicate
sudden severe tire damage caused
by outside factors and does not detect a
natural, even pressure drop in all four
tires.<
In the following situations, on the other
hand, there can be delays in detecting tire
pressure losses, and even system failure:
When driving on snow-covered or slip-
>
pery 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 driv-
ing with snow chains fitted
and correct if neces-
Online Edition for Part No. 01 41 0 157 631 - © 07/03 BMW AG
When driving with a compact wheel, the
>
Flat Tire Monitor cannot operate.
Initializing the system
Perform the initialization immediately
every time you correct the inflation
pressure, change a tire or change a wheel
or all wheels. A drive is required for this
purpose.<
1.
Before the start of driving, start the
engine, but do not drive off
2.
Press the button until the yellow indica-
tor lamp in the instrument cluster lights
up for a few seconds
3.
Drive off.
It takes a few minutes until the Flat Tire
Monitor can detect and indicated a flat tire.
Do not initialize the system when driv-
ing with snow chains or with a com-
pact
wheel.<
Flat tire
Indicator lamp
The symbol in the instrument clus-
ter lights up in yellow.
1.
Reduce speed and stop the vehicle
carefully. Avoid sudden braking and
steering maneuvers
2.
Identify damaged tire
If identification is not possible,
contact your BMW Sports Activity
Vehicle
Center.<
3.
Replace the damaged tire, refer to
Changing a wheel on page 103.
53
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