Technology for comfort, convenience and safety
86
FTM Flat Tire Monitor*
The concept
The Flat Tire Monitor detects a pressure loss in
one tire by comparing the speeds of the individ-
ual wheels during driving.
In the event of a pressure loss, there is a change
in the rolling circumference and therefore the
rotation speed of the corresponding wheel. The
system detects this change and reports it as a
flat tire.
Functional requirement
To ensure the reliable signaling of a flat tire, the
system must be initialized at the correct tire
inflation pressure.
The initialization must be repeated after
every correction of the tire inflation pres-
sure and after every tire or wheel change.<
System limits
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, the system could be
delayed or malfunction:
> System has not been initialized
> Driving on snow-covered or slippery roads
> Sporty driving style: slip in the drive wheels,
high lateral acceleration
> Driving with snow chains
*
Initializing system
The initialization finishes during driving,
which can be interrupted at any time.
When driving resumes, the initialization is auto-
matically continued.
Do not initialize the system when driving with
snow chains
*
.<
With Sequential Manual Transmission via the
button in the center console:
1. Start the engine, but do not start driving.
2. Press the button for approx. 5 seconds.
After the button is released, the warning
lamp lights up in yellow for several sec-
onds in the instrument cluster, refer to
Indication of a flat tire. The message "Initial-
izing FTM ..." appears on the Control Dis-
play for a few seconds.
3. Start to drive.
The initialization finishes during driving
without feedback.
Via iDrive, for operating principle refer to
page 16:
1. Press the button.
This opens the start menu.
2. Press the controller to open the menu.
3. Turn the controller until "Settings" is
selected and press the controller.
4. Select "Vehicle / Tires" and press the con-
troller.
Online Edition for Part no. 01 41 0 014 244 - © 08/07 BMW AG
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