Disconnecting, removing, or replacing the siren should solve your 'alarming' problem. There are many posts about the siren batteries going bad, creating this problem (do search). A new siren (old off the shelf) could eventually (maybe soon) have the same problem? I just removed mine. It's now a paper weight on my work bench. Once disconnect, everything except the sound should work as designed. Lights will flash until reset, etc. Removing the wipers can be a bit difficult. I used a battery terminal puller. A gear puller should work also?