Modern Vespa

MP3 500 has been parked in garage for a few months now for winter. I've had the bike over a year and I stored it last year without issue. When I go out to start it up now, as soon as I turn the key the horn starts beeping non stop! It shuts off when you turn the key off again. It seems k
Like its a alarm I guess, but never had this issue before. I even disconnected the battery & reconnected to see if that would fix it, but it doesn't.
Any suggestions or help?!?!

Many have had the same issue. The horn honks 5 times.

Turn your bike on, cycle the tilt lock switch a few times to "lock in" a new hydraulic pressure reading in your system. You probably will notice a mushy lean in your tilt lock before it gets cycled. The whole thing is caused by a leaky seal in the hydraulic tilt lock mechanism that allows trapped hydro fluid to backwash into the reservoir. No drips will be detected...

See this thread....
MP3 500 Horn Alarm goes off every time I turn it on. WTF!?!

I didn't worry about it with mine since I bought it with no warranty, but I did wire in a toggle switch on my dash that cuts power to the horn... I use it when restarting the bike after a period of non use. (I have a 120db air horn as a replacement and sensitive neighbors)

Steve H/B