How is the Motion Sensor armed? Follow By default, the Motion Sensor is programmed to only arm in the Away mode. However, per request, the programming can be altered to also have the Motion Sensor arm in the Stay mode. This can be done by contacting Customer Care. Facebook Twitter LinkedIn Comments 0 comments Article is closed for comments. Articles in this section How do I mount my Motion Sensor? How does the Motion Sensor detect motion? Can I drill my Motion Sensor into the wall? Can pets trigger my Motion Sensor? What happens if the Motion Sensor sees motion while the system is armed? How is the Motion Sensor armed?