The door sensor for the belts is in the actual door latch, on the door. I haven't found a way to fix this without replacing the latch. The locking mechanism on the seatbelts unlatches when the door "opens", so fix it properly.
There is no sensor in the seat. Belts were designed to stay buckled at all times on the coupes and hatches. You're supposed to lift the belt and step out.

Note the "EMERGENCY RELEASE" on the belts and center console. As I recall, unplugging the sensor at the seatbelt latch only disables the light.
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