Question, is there a air bag connection on the seat belt buckle on the 00 s-type, have air bag code 36, pulled up seats and unplugged and plugged in the under seat connector to no avail.

 

Sounds like you're looking in the wrong place.

36 looks to be the airbag which I doubt is wired there - but check the electrical guide and/or workshop manual, free downloads.

 

You might want to try to understand the system before you diagnose incorrectly and throw parts at the problem.
Here is the Tech Guide/Intro we got when the S-Type Sports Sedan was introduced.
Some general info on the SRS and component locations pages 32 to 35.

bob