Update… I replaced the siren with one from NeedsWings. A little more expensive, but it is a new Mercedes piece and it now chirps on lock and unlock! Nice to have feature. So far so good no battery drain. Thanks guys for your help. I tested the siren by pressing the panic button. Lights flashed but no siren. So I replaced it and now it’s quite loud in panic mode and chirps with lock and unlock. This will help my mom know it’s locked, chirps twice for lock and once for unlock or the other way around can’t remember for sure lol. Thanks again!