Aerpro CT10BM01 T-Harness for BMW 3 Series (E36, E46), 5 Series (E39), 7 Series (E38) & Z8
T-harnesses let you integrate an additional device such as an aftermarket Bluetooth kit into your car's factory radio and its wiring. This allows your aftermarket Bluetooth kit to work with your car's speakers directly when on a phone call and revert back to the stereo when the phone is not in use.
BMW 3 Series 1990-1999 E36
BMW 3 Series 1998-2005 E46
BMW 5 Series 1996-2004 E39