Car wiring diagrams: Bmw Diamond Key Diagram, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. Diamond key replacement batteyr DIY NO K E . Welcome to Bimmerfest The Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences . Video embedded This procedure will work for all keys that are not the square style key. This is the full procedure on how to initialize your old or new keys or .