There are a few things that will happen
1) your seat belt light and chime will be on all the time. U can override chime and even jumper the wires so the seatbelts think they are always connected.
2) more important your airbag light will be on and your airbags will not work. The seat track position sensor and pretensioners being unhooked will cause this.
3) 2007 is a weird year for the passenger seat detection. There are 4 weight sensors that are under the passenger seat mount. One at each bolt. Oo nly 2007 has this, 08+ all have a pressure pad in seat you can move over. If you do not use the factory mount you cannot use the sensors. You could measure the resistance on them and jumper in a resistor so the jk thinks someone is in the seat and the airbags would work assuming u fix #2.
I personally wouldn't want my airbags not working and the airbag light on but that's me.
The plug you are wondering about plugs right in to the seat track position sensor. Just buy a new sensor plug it in and zip tie it to the track on the new seat.
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