This is a retrofit guide for the e90 so it will give you a rough idea what it looks like and where to look,

**Bluetooth Retrofit Guide** for TCU and ULF - BMW 3-Series (E90 E92) Forum - E90Post.com

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.