While I've not had this on the P38 I have had the same on my GTA so try and read between the lines here and use the info for what it is.
Open circuit Permanent there means the circuit is broken if it was intermittent it would still be getting a signal occasionally . I think its all similar when it comes to descriptions across manufactures and it makes sense to me so I would look at the connector first and then move to a possible broken wire on that circuit. I believe the airbag is in the seat on your later vehicle(from what I've read although it would be nice if a more knowledgeable member could confirm) so moving it back and forth over the years may have caused fatigue in the wire.
I ended up cable tying the connectors together as that was my issue on the GTA. Not that much help but at least its a start.