BMW X3 Owners Manual: The concept
The system detects tire inflation pressure loss on the basis of rotation speed differences between the individual wheels while driving.
In the event of a tire inflation pressure loss, the diameter and therefore the rotational speed of the corresponding wheel changes. This will be detected and reported as a flat tire.
The system does not measure the actual inflation pressure in the tires.
Functional requirements
The system must have been initialized when the tire inflation pressure was correct; otherwise, reliable flagging of a flat tire is not assured.
Initialize the system after each correction of the tire inflation pressure and after every tire or wheel change.
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"
3. 
"Flat Tire Monitor (FTM)"
The status is displayed.
Initialization
When initializing the once set inflation tire
pressures serve as reference values in order to
detect a flat tire. Initialization is started by confi ...
Other materials:
BMW X3 Owners Manual > Parking lights/low beams,
headlight control: Daytime running lights
With the ignition switched on, the daytime running
lights light up in position ,
or
. After the ignition is switched
off, the parking
lights light up in position
.
Activating/deactivating
In some countries, daytime running lights are
mandatory, so it may not be possible to deactivate
the ...
BMW X3 Owners Manual
BMW X3 Service & Repair Manual
