I could spend time and may still trying to research this. But the wealth in this forum never ceases to impress me. Seat belt is buckled, but the chime goes off every time I put it in drive and the light on the dash is always on. There do not seem to be any fuses for this and all the plugs under the seat look fine. Is the easy fix just cutting the harness to the belt buckle and crimping the wires together?
Isn't it the buckle assembly that goes bad The switch in the buckle assembly that's attached to your tunnel or floor seat side whatever it is You just change that plug it in an all works?. That's how I thought that went generally I think that's how it's been in other cars when I've had to put seat belts back in and all that in other vehicles at least.
If that's true the solution could be as easy as swapping out the seatbelt latch with one from your local yard for $20.
Or out of one of the cars sitting here in the yard I think a lot of Corollas and other Toyotas of similar type design like not a truck are very similar same two wires coming out possibly the same buckle plugs in all that sort of thing Not really much to it at least that's what it would seem to be it is in most of the other vehicles I haven't personally ripped out the seat belt buckle assembly to look but if you reach down and feel and Corollas and all of that going back to the mid '80s have the same two wires coming out to plug in that puts the light on on the dash and later on tells a body control module to put the light on and so forth. I don't think we've moved much from that of course the buckle has to accept the shape of the clip that's going to be inserted in it so it will latch and put the light out.