Here are the 10 Steps to Happiness:
Get 1 idea ;-)
2. endeavor Amazon
3. Order
4. Wait for delivery
5. Radio out (I habs me two small long hex keys made)
6. Connection to target
7. cable in the glove compartment place (a bit then you need look no drilling or so)
8. Radio back purely
Gone 9. Ins menu and AUX activated. (Advanced menu on the note button or sound icon by pressing and holding call)
10. TEST!
That's it for now with the upgrading of the car.