this method works with MMI 3G Plus without Bose & Band Olufsen system.
For bose / bang you will need to find the pinouts to connect RCA converter.
first of all, we have to take out the entire module. which is located in boot under left hand side cover
then you have to unscrew 3 screws
Now you can easily pull this whole unit off.
We need now access to the main connector
it’s best to pull it out because the pins are described in the back
there is a lever under the plug that must be pulled to remove the plug.
Now we need pinout schemes
So, how it looks on connector?
So we need to connect our RCA converter on to pins 9 (+) and 13 (-)
I have made crimp connectors at my own to make it easier to later disconnect from the system.
and just need to connect all together.
I do not show how to properly connect amplifier in this car because it’s really easy job. the battery is in the boot, so you do not have to drag the cables through the car, to get a REMOTE signal i just used lighter port on the right side.
I hope it will help you 🙂