Flat tire monitor – BMW 745i Sedan 2004 User Manual
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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 of one tire
drops significantly in relation to the pres-
sure of 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 requirements
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
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 you are 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 driv-
ing with snow chains fitted.
Initializing the system
Perform the initialization immediately
after correcting the inflation pressure,
changing a tire or changing a wheel or all
wheels. A drive is necessary for this pur-
pose.
<
1.
Start the engine, but do not drive off
2.
Select "FTM" from the "Settings" menu
and confirm. The initialization menu
appears
3.
Select "SET" and confirm
4.
Drive off.
Status: "FTM is being initialized" is dis-
played.
It takes at least 10 minutes before the Flat
Tire Monitor can detect and report a flat
tire.
When driving with snow chains, do
not initialize the system.
<
Select
and confirm to exit from the
menu.
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