Hai all the sifu out there, I'm driving E34 with M20b20, recently my car have this problem when suddenly these 4 item not function (Power window/central lock/radio/inside car light).:motz: sometime it function and sometime it not, it seem like the connection / contact is not in proper condition. :motz: I have check all the fuse and it was ok. Any sifu can guide me which area should i check? How about under behind seat? Is there any fuse or connector ? Thanks