Hi Lewis
Welcome to the Forum
From what I understand there is a CD Changer input and an Aux Input on the back of the head unit if the Aux cable is plugged into the wrong one it doesn't register. If the Aux port was fitted by someone else (not BMW) that is quite possibly the problem. You will need to remove the radio to check, at the back of the radio there is the main power/speaker connector on the left hand side the Aux connector should slot into the main connector. Beneath the main connector is separate connector socket for the CD Changer.
So pop out the air vent unit above the radio (2 flat screwdrivers and a trim tool) undo the 2 screws that hold the radio in place and slide it out there should be just enough cable slack to see what is plugged in to where. If the main power/speaker connector has a small plug beneath it disconnect them both and at the bottom of the main power connector you should see a slot to take the Aux connector push it home until it clicks replace the power connector and antenna if you unplugged it and slide the radio back. Turn on the power and now you should have a working Aux port. Put the screws in and slide the air vents home 15 minutes work 😅
Hope it works for you
Dave
By
Greydog ·
