According to the manual:
"The system uses sensors on the wheels. The radio signals from these sensors are transmitted to the tyre pressure monitoring system."
And:
"If you wish to replace factory-fitted wheels, please ensure that the new wheels are equipped with sensors that are compatible... Each tyre valve is fitted with a sensor which measures the pressure inside the tyre..."
You get the drift.
Some Passats have "Tyre monitor Display" (manual 3.3 page 65) that uses "data from the ABS sensors" but the R36 comes with "Tyre pressure monitoring system" (manual 3.3 page 67) as described above using sensors on the valves.
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