As Forest noted, they can act up on their own if they get wet. BCS replaced ours under warranty several years ago, but the new one did the same thing; in the rain it would lock or unlock by itself. This year our tech at BCS silicone super-sealed both the pad front and the panel's interface with the coach body. Even when rinsing wash water off with direct nozzle spray inundation now, it no longer activates on its own.
As Jim mentioned, the controller box for the keyless entry is underneath the small access panel in the dash top. The panel is velcroed down, so a careful flatblade screwdriver or other instrument prying action will pop the panel up where you can get a grip and lift it out. As I recall, the controller module is a black plastic box, maybe the size of a card deck?
Joel