BMW M5 Sedan 2009 - Manual (Page 86)

Technology for comfort, convenience and safety
84
The last selected program is active each time
the engine is started.
You can also activate your preferred program
with the button on the steering wheel, refer
to MDrive on page
52 .
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
In order to ensure that a flat tire is reported cor-
rectly, the system must be initialized while the
tires have the correct inflation pressure.
The initialization must be repeated after
each time the tire inflation pressure is cor-
rected 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 snowy or slippery road surface
> 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 con-
tinued automatically. The system is initialized
after this activation phase. When driving with
snow chains, the system is not initialized.
<
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 seconds
in the instrument cluster, refer to Indication
of a flat tire. The message "Initializing FTM"
appears on the Control Display 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 2 600 738 - © 08/08 BMW AG