These connectors are used to connect the pre-tensioners built into the seatbelt buckles. Often, a core can be damaged or the whole cable ripped by getting tangled in the seat frame. I repaired one a few weeks ago that was eaten by a Jack Russell!
Owner thought it was happy sleeping with head under seat!
If it is repaired, make sure new cables are soldered and heatshrinked and properly taped up.
You should pull SRS fuse and ignition should be off when working on this system.