Flat Tire Monitor Ftm - BMW 328i xDrive Owner's Manual

after approx. 2 seconds and the car will start to
roll backwards.<

Flat Tire Monitor FTM*

The concept
The system does not measure the actual infla-
tion pressure in the tires.
The system detects a tire pressure loss due to
speed comparisons among the individual
wheels as you drive.
In the event of pressure loss, the rolling circum-
ference changes and, thus, the rotating speed
of the affected wheel. The system detects this
and reports it as a flat tire.
Functional requirement
The system has to have been initialized at the
correct inflation pressure; otherwise, a reliable
reporting of a flat tire is not assured.
Each time a tire inflation pressure has been cor-
rected or a wheel or tire has been changed,
reinitialize the system.
System limitations
It is impossible to provide advance warn-
ing of sudden, severe tire damage caused
by outside influences.<
The system will not detect a natural, uniform
pressure loss in all four tires. Therefore you
should check the inflation pressure regularly.
In the following situations, the system could be
delayed or malfunction:
>
System has not been initialized
> Driving on snowy or slippery road surface
> Performance-oriented style of driving: slip
in the drive wheels, high lateral acceleration
> Driving with snow chains
Online Edition for Part no. 01 41 2 604 304 - © 02/10 BMW AG
Initialization
In the initialization, the set inflation pressures
are adopted as reference values for the detec-
tion of a flat tire. The initialization is begun by
confirmation of the inflation pressures.
Do not initialize the system while snow chains
are attached.
For operating principle refer to page 74.
1.
2.
3.
4.
5.
*
When driving resumes, the initialization is con-
tinued
Start the engine immediately before pulling
away, but do not drive off yet.
Lightly push button 1 in the turn indicator
lever up or down repeatedly until the corre-
sponding symbol appears in the display
accompanied by the word "RESET".
Press button 2 to confirm your choice of the
Flat Tire Monitor.
Press button 2 for approx. 5 seconds, until
the reading shown below is displayed:
Start driving.
Initialization is completed while the car is on
the move, without any feedback.
The initialization is completed during driv-
ing, which can be interrupted at any time.
automatically.<
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