it could be anything that is draining your batt. I dont think it is your window module. the module doesnt draw that much anyways. its always on stanby untill a ground pulse it sent to activate ir. The only thing i can think of is the alarm itself. usaully alarms themselves dont even draw much. Try pulling the fuse on the alarm first and see how that goes. It might even be your battery. Get a load testdone on it @ autozone. i think its free.