My '99 developed some issues with the electric side locks, got so they could not be depended upon for sure locking or sure unlocking. The side door tractor drive system also got a bit crazy/lazy. (Don't know if your model has all this stuff) Anyways, I ended up removing all the electrics for the rear side door locks and all the tractor goodies. Now the doors are totally manual .. opening, closing, locking, unlocking ... life is much better. The doors are easy to operate.
I highly recommend!