VW Radio RCD300 VCDS Coding / VAGCOM Setup

I have used this sequence to enable AUX input on my 2008 VW Passat RCD 300 radio but any updates are done at your own risk. I accept no liability if your system behaves in a different way! Always remember to record the values that are shown in VCDS before making any changes!

I believe this only works with the RCD300 Plus model identified by the MP3 logo on the front above CD player

How to Setup AUX input on VW Passat RCD 300 radio

To enable AUX input on 2007+ unit do the following using VCDS/VagCOM.

Open VCDS, Go to 56 - RADIO, then choose Coding and change last digit to 1. Once done then press the "Do It" button. 

Close VCDS and you should find that when you press the CD button that AUX appears on the radio screen.