sorry guys, your door automatic lock option is really not available on our prius C, i tried to access using diagnostic machine but the option is not available..
but i was able to disable the buzzer for seat belt and there are a few options that i can access.

normal key alert, seatbelt alert, low key batt alert and host of useless function to me...
I was charged RM50 bucks for the changes...considering the machine cost more than 20k that's fine!