Very interesting..... and thanks for yours help.
No! I don't have any ipod, iPhone or electronic interface and my premium TPMS don't have the spare wheel sensor. I think that in Italy Jeep have saved money...
... TPMS only for four wheels.
However the problem show up only with the rain and in the dry all work fine.
....But...today I have seen the schematic wiring and the connector location and I have seen that the connector C105 which is wet because it's near the right wheel. And ...thinking about it ...... sometimes entering a puddle show up also the lights on diplay of front park assist.
In the connector are presents all cables of COM-LIN TPM LAN and all of the park assist. Maybe that the connector is the problem?..... I try to seal it and close all openings in the left wheel house splash shield.
I look with the next rain and I'll let you know soon.