2013 Volvo seatbelt chime won't stop

I've never heard of the switch being stuck open? But my cure for yard driving may help... Find the wires that feed into the driver side seat belt. (to right of captains chair) Short the two wires using a paper clip.
If it stops you have a bad switch; if not, you have an open circuit between the switch and BCM.

Good luck!

 

When I was at Knight my Volvo did that. Ended up getting a new seatbelt.

 

An '11 I used to drive had a plug/connector under the seat. I unplugged it, peeled the plastic off a twist-tie and used it as a jumper on the female side of the connector.

You made it much farther than I did, lol. It started on the skyway eastbound , I didn't make it past the first service plaza in IN.

 

It could also be the passenger side.
Have you tried buckling the passenger side seat belt?

 

Mine has done it a few times but i managed to get it stop by buckling /unbuckling - wiggle n jiggleing it.
Not knowing for sure how its assembled my guess is that when inserted something retracts and then pops back out making an electrical contact but its not popping back out - worn or dirty ?

 

I was able to insert the paper clip (or it may have been a bent staple, I forget now) directly into the back of the plug, no cut or stripping needed.