The technology giant's solution would let owners control their vehicle from a smartphone over Bluetooth, Wifi or the cellular network. The patent mentions obvious uses like unlocking the doors and starting the engine. Apple also outlines sharing access with other devices to let more than one person use the car (pictured above). Since each phone is an identifier, the model could theoretically adjust the seats and mirrors to the right preferences as someone approaches.
Of course, security would seem to be a problem. Apple says that access is limited by using a passcode, but there's no mention of what would happen if the smartphone's battery dies, it breaks or gets stolen. Presumably, owners would be back to the old days of getting in with a key.
Similar ideas to this patent are already at work in some current vehicles. For example, Tesla offers an app that gives owners remote access to many of the functions that Apple suggests.