If the PDC module doesn't see the sensors, it'll sound a warning inside the vehicle. Removing the wiring means the PDC module won't see the sensors, so it'll sound a warning.

You need a rear only sensor PDC module, which won't be looking for front sensors.

This one doesn't have pins in the centre connection location, so it's a rear sensor only unit.

https://www.ebay.co.uk/sch/i.html?_nkw=126...5467.l1311 2009 Rimini Red SE TD4. Soon to be sold.
Hyundai Ioniq 5 Ultimate on order.
Gone. 2006 Tonga Green i6 HSE.