97 Plymouth grand voyager SE locks unlock and lock and lights turn on and off continuosly what is going on?

It's an emergency warning system, telling you that a door is ajar. If you are certain all are closed, the problem is in the electrical/sensor system. this has happened to us before, the battery in our remote keychain (that opens and locks the doors etc) was low and was doing that. We replaced the batteries and no more problem! ~pawsalmighty