The wifegod has a '98 Grand Voyager.

In that model, the door locks are protected by a 40 amp FUSE in the fuse/breaker panel under the hood, just outboard of the battery.
The lid has a roadmap, which (in her '98) shows the fuse to be next to the top in the column of 40 amp fuses.

As has already been said, the body computer controls the locks, and knows better than all of us mere mortals. A reset might be in order (by leaving the battery disconnected for a while).