I had an issue with my tilt lock some time ago and I fixed it, the reason was the cable connecting the seat to the scooter was plugged/cutoff out when I did change the parking brake cable when I removed the seat.
Here are two threads: - I wrote about it , - I read it maybe similar
1- Paiggio MP3 400ie 2009 model seat sensor not working.
2- Seat sensor not working
Yesterday, while accidentally pressing the tilt lock switch and I was not sitting on the scooter (Lucky, I was holding it with both hands!!!) the tilt lock unlocked the tilt locking mechanism! I was surprised. In summary I had an issue which was due to the cable (as above) was cut off, I had a friend connect the cable and the tilt lock worked perfect, but I never tested it while not sitting on it (it worked before I change the parking brake cable), I never thought of testing it while I am not sitting on it, but now it locks and unlocks while I am not sitting on it (tested it many times).
My question, does the connection for the cable under the seat has like 3 small cables or is there anything that I need to be a ware of in relation to that connection (under the seat)? or what could be the possible problem? It locks and unlocks by the tilt switch, and unlocks when I give it power by the throttle.
thanks a lot for your comments.