It would help to do a root-cause analysis of how that wire harness got damaged. Then, as Rowie suggests, the wiring needs to be repaired.
Undo the 4 floor bolts that hold down the seat, then tilt it back to access the underside. It will be challenging to unbolt the seat with the motors not working. I've done this on my 2015 (to replace a broken seatbelt clasp), and running the seat forward and back to access the 4 bolts was part of the drill. Try an alligator clip cable to "jumper" any severed wires as an interim.
Undo the 4 floor bolts that hold down the seat, then tilt it back to access the underside. It will be challenging to unbolt the seat with the motors not working. I've done this on my 2015 (to replace a broken seatbelt clasp), and running the seat forward and back to access the 4 bolts was part of the drill. Try an alligator clip cable to "jumper" any severed wires as an interim.
