I have made some progress with the Becker 780
Its controlled by an Arduino pro mini with a Bluetooth module and an IR receiver for remote control.

I have made in a small movie how it works.
I have done it in English but do mind I'm Dutch, and i never speak English.

https://www.youtube.com/watch?v=7wbGRcMYx9w





The idea is to have an original Becker from the correct time period in my car (190D 1986)
But with some modern functionality, mostly the car-kit function and music stream from the mobile phone. The remote control is an added bonus

Attached Thumbnails

     

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1986 W201 190D 2.5 ~ From bare bone to almost full option.
1985 W201 190E 2.0 ~ Project car