you can stop it, where you go to set your time and stuff when its off you are able to stop it from making that warning chime, ive had pioneer decks in all my cars, but i dont seem to mind it, whats annoying is on the newwer decks that flip outwards electronicly is they open up when you turn the car off, also can be turned off in the options
i've got a sony deck, and i think the beeping in my car has decided to turn itself off . Nah i remember seeing it in the manual somewhere i believe. As someone else has said it's a warning thing to remind you to take the face plate off (if you bother).
Mine beeps to let you know you haven't actually turned of the CD player before you've turned off the car. Well it's meant to, if the person who installed your headunit in knows how to correctly connect the bloody memory wire!!!! :bang:
So i guess there's one way to stop it. Disconect the memory wire.