I can't remember about the locks but the lights flash when the alarm goes off. If it is in the garage I would suggest leaving it unlocked to stop the siren. Note: if it is locked and you unlock it with the FOB it will lock again in a few minutes if you don't open the door, so make sure to open the door to keep it unlocked. I left mine unlocked for a few days and had no problems with the siren while I waited for the part to come in and time to install it.