Currently, unlock with ign off on Modlight does not work correctly. If you pull the key out too quickly, the windows open. Other issues include the mirrors opening with ign2. Dont know about the "iBus app", I've never heard of it, but the Modlight is a bit finicky on the E53. Svetlin (Modlight) is trying to fix it. Apparently there are issues on 'some' E53s but I can only confirm I have some hiccups with mine.