Key fob or lock cylinder

My 09 Prius has a weird issue. It self locks and unlocks when we’re sitting in the car or even near by.

Sometimes it won’t respond to unlocking or when I press lock it does a consistent beep tone until I unlock it.

I don’t know if it’s the Fob messing up or the lock cylinder

everything else works fine starting wise. So does the fob slot.


I’m clueless and don’t want to buy a new fob