My radio always turns on upon unlocking the doors. I assume (although I've never checked) that it will turn off after the usual 15-20 minutes that happens when sitting with the key in the ignition and turned off.
I'm not exactly sure of the precise happenings, as I've got used to the radio coming on when I unlock the car to clean—so definitely no key in the ignition. I think I remember hearing the radio (well, actually the iPod) through the closed door, but memory being malleable means ?????I've never had my radio turn on unless the key is in the ignition and the car is on (either to power accessories or to start the engine). So, @GregW and @mattkidd93, every time you unlock your car your radio turns on? Even before you open the door? I've never seen a car do that, let alone our 718s.