seat belt buckle won't snap drivers side

Replace the seat belt buckle.

This video shows how.

I've done it without removing the seat.

 

You GOTTA love YooTube Comments:

30 years old ''unreliable'' Jaguar seatbelt mechanism: Works perfectly
2 years old ''reliable'' Toyota seatbelt mechanism: Broken



While I gave Jessie a "like" I didn't add a comment.
I treat YooTube comments like novels.
One should read more and write fewer of them.

Note:
ALWAYS disconnect the battery before tinkering with seats.
If you do not know why this is important - then you should hire it done.
HOPEFULLY by someone who would at least vacuum the floor of the vehicle a LITTLE bit after the seat is removed.

He was at least honest enough to leave the change and 2-year-old M&M.....

 

Junk yard replacements are cheap and plentiful. You'll probably waste more time on YoooTube and get bad advice than replacing it.