Seatbelt locked...

I searched about seatbelts and the problem most people have it that the motorized part is not working (Mine is working)- Well, on mine the belt is not latched into the motorized part, is completely retracted and will not unlock.
I know they have a lifetime warranty, but the guy I bought this car from installed seats from a newer Civic so I figure that voided the warranty.
If I take it apart is there anything I should look for? Is it worth the trouble or should I just convert to manual seatbelts?
Any ideas?

i’d say because you are so close to CAD, convert, but if you must, open it up and look at the locking mechanism. my manual seatbelt was doing the same thing. i opened it and fixed it