See also:

The concept
The tire inflation pressure is measured in the four mounted tires. The system notifies you if there is a significant loss of pressure in one or more tires. ...

Safety switch for the rear
Press the button on the driver's door if children are being transported in the rear. This locks various functions so that they cannot be operated from the rear: safety switch. ...

Flat Tire Monitor FTM
The conceptThe system does not measure the actual inflation pressure in the tires. The system detects a pressure loss in a tire by comparing the rotational speeds of the individual wheels while mov ...