I was able to install my new GROM-BT3 in my 2001 BMW 330ci with the Harmon Kardon system (many thanks for the excellent installation video
). I successfully connect via Bluetooth every time I turn on my Business CD head unit.
However, as the car didn't come pre-installed with a CD Changer, I can't find a way to engage the CD Changer settings to listen to music from my iPhone 7s Plus. Is there some setting I can make in the Business CD head unit, or some wiring adjustment I need to make in the trunk area?