When I had my mk3 Jazz EX serviced a few years ago I picked up a Deflation Warning System (DWS) user guide from the service counter. The guide includes instructions on how to calibrate the DWS, for Models without Display Audio (EX?) and for Models with Display Audio.
I keep the guide in the glove box and refer to it when checking or adjusting tyre pressures.
I have not had any issues with the TPMS. It works well alerting me about a slow puncture caused by a screw.
Fred.