BMW 525i Owner's Manual page 89

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
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
When you are driving with the compact wheel
the Flat Tire Monitor is unable to function.
Initializing system
The initialization finishes during driving,
which can be interrupted at any time.
When driving resumes, the initialization is con-
tinued automatically. When driving with snow
*
chains or with the compact wheel
initialize the system.<
iDrive, for principle details, refer to page 16.
1. Press the button.
This opens the start menu.
2. Press the controller to open the menu.
3. Select "Vehicle settings" and press the
controller.
4. Select "FTM" and press the controller.
5. Start engine, but do not start driving.
6. Select "Set tire pressure" and press the
controller.
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7.
tires.<
8.
*
The initialization finishes during driving. Then
*
the message "Status: FTM active" appears on
the Control Display again.
Indication of a flat tire
There is a flat tire or extensive inflation pressure
*
, do not
loss.
1.
2.
3.
Run-flat tires*
1.
2.
Select "Yes" and press the controller.
Start to drive.
The message "Initializing..." is displayed.
The warning lamp lights up red. A mes-
sage appears on the Control Display.
In addition, an acoustic signal sounds.
Reduce speed and stop the vehicle care-
fully. Avoid sudden braking and steering
maneuvers.
Identify damaged tire.
If identification is not possible, con-
tact a BMW center.<
Replace the damaged wheel, refer to
Changing a wheel on page 207.
Cautiously reduce speed to below 50 mph/
80 km/h. Avoid sudden braking and steer-
ing maneuvers. Do not exceed a speed of
50 mph/80 km/h.
If the vehicle is not equipped with run-
flat tires, refer to page 194, do not
continue driving. Continuing to drive with a
flat tire could cause severe
At the next opportunity, check the air pres-
sure in all four tires.
If the tire inflation pressure in all four
tires is correct, the Flat Tire Monitor
accidents.<