bro harbhajan,
for your jap spec radio, this this fix that i found in another forum, try if it works in your car
http://www.bmwclubmalaysia.com/forums/showthread.php?t=33552
for your nav system, as i said above I dont think it'll work in malaysia, apart from maybe changing the nav computer in the back of your car. dunno what else is required to make it work, maybe someone else could advice. As per your current setup, it'll not work whatever you do.