Also check the bundle of connectors behind the kick panel just below the hood release. I've had some WEIRD auto seatbelt problems (like self aware, you-leave-when-I-want-you-to stuff) when I first got my EA82 sedan and it turned out the 10 pin plug was only partially plugged in (must have kicked the connector to release some how?).
Plugged that puppy back together and no problems since then. That is also the harness for the rear tails, dome, Driver's side windows and locks and a few others, I think..