Not sure how much I can help but I put 90 teg seats in my 90 civ 4dr and was/am having trouble with the warning chime/light and decided (SINCE NO ONE KNEW OR ADDED ANYTHING) to just take out the control box from under my console.
I had to contact a friend at Honda and he pulled it up where it was. You may have the same type of box/location but I am not certain on this .
Is it only on one side or both? Like Benson said, check fuse first and then in the "B" pillar under the plastic cover should be the motor/track for it.
I'm in the midst of putting carpet in today and can shoot ya some pics if you don't mind PM'ing me your email. Mine looks like a pain to remove (the motor), so I disabled it in the 'run' position, so when I drive I just attach it to the latch at the window. Same safety, just no movement.
E