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Flat Tire Monitor FTM
The concept
The system does not measure the actual infla-
tion pressure in the tires.
The system detects a pressure loss in a tire by
comparing the rotational speeds of the individ-
ual wheels while moving.
In the event of a pressure loss, the diameter and
therefore the rotational speed of the corre-
sponding wheel change. This is detected and
reported as a flat tire.
Functional requirement
The system must have been initialized while the
tire inflation pressure was correct; otherwise,
reliable signaling of a flat tire is not ensured.
Each time a tire inflation pressure has been
corrected or a wheel or tire has been changed,
reinitialize the system.
System limitations
Sudden serious tire damage caused by
external influences cannot be indicated in
advance.<
The system will not detect a natural, uniform
pressure loss in all four tires. Therefore, check
the tire 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
>
Snow chains are attached
Status display
The current status of the Flat Tire Monitor can
be displayed on the Control Display, e.g.
whether or not the FTM is active.
1.
"Vehicle Info"
2.
"Vehicle status"
Online Edition for Part no. 01402911223 - © 06/13 BMW AG
Technology for driving comfort and safety
3.
"Flat Tire Monitor"
The status is displayed.
Initialization
The initialization process adopts the set infla-
tion tire pressures as reference values for the
detection of a flat tire. Initialization is started by
confirming the inflation pressures.
Do not initialize the system when driving with
snow chains.
1.
"Vehicle Info"
2.
"Vehicle status"
3.
"Reset"
4.
Start the engine – do not drive away.
5.
Start the initialization by selecting "Reset".
6.
Start driving.
The initialization is completed during driv-
ing, which can be interrupted at any time.
When driving resumes, the initialization is con-
tinued
automatically.<
Controls
91
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