BMW E90 Auto-Dimming + Compass Mirror Retrofit into E46 : r/e46
OEM BMW Auto Dim RearView Mirror Homelink Hidden Compass E46 E39 E60 E90 E53 | eBay
Upgrading the auto dimming rear view mirror | Volkswagen Eos Forum
DIY - additional wiring info for Homelink / Autodimming mirror in e88/e93 - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)