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Replace the belt and buckle as one unit.
You have to replace the entire assembly.
I had the same problem in my 99 Sienna. I went to the Toyota dealership (Canada) and they said I had to replace the entire seat belt and mechanism ($300+). Apparently the seatbelt sensor is tamper-proof, so if it goes on the fritz, you have to replace the whole thing instead of just replacing the sensor. I'm not convinced; I think Toyota is saying that because you're not supposed to tamper with it (ie. protecting their liability), but there must be a more affordable do-it-yourself way to fix it. I have the same with my 2000 Sienna. I found a Corolla owner on a forum with the same problem and he replaced the buckle with a newer one that had the buckled-sensing switch in the buckle and wired it into the switch plug from the belt retractor. Can we do the same with our Siennas? I am going to check this out. It seems that Toyota used the buckle sensor up until 98, switched away from it for three years, and then went back to it in the 2001 models, hence the ability to replace the buckle.
Best to go get a used one & replace it
Remove lower seat cushion by popping the front of it upward from the 2 retaining clips, then sliding it forward. The seat belt buckle is bolted to the floor.
I don't see how you could install just the buckle. I suggest you go to almost any salvage yard and get a replacment belt/buckle assembly. Replace the whole thing.
With some belts there are clips in the reverse side, which you can use to change the buckle. What do you do if the belt you want doesn't have clips? Well I cut the stitiching or remove the rivets, depending on which the belt has, then replace the buckle and refasten it with safety pins, or if you have a thinner belt you may prefer to staple it. Hope this helps.
The parts of a belt buckle are the prong, buckle and belt.
The buckle.
"D" Rings
For men, the buckle is on the left.
Value of Belt buckle: Buckle Name Discover El Paso No. 814?