Touch drivers side door the horn goes off

Does this happen every time you try to open the door? If you use the key to lock then unlock the door does it still go off? How about if you use the key fob to lock and unlock it, does it go off then?
It sounds like it could be a fault in the door module but the only way to tell for sure is to use a DRB or equivalent scan tool and look at the anti-theft module for the last cause of it tripping on. It will say something like, Drivers Door switch or Hood Switch caused activation.