So I have a Audi A4 2008 B7 with no CD changer nor ipod mount so i went ahead and bought one of those ipod modules which goes connected to the CD Changer port on my Simphony II+. I press the CD button and it just says "No CD". Everything was installed as directed. I was browsing through other forums and some said i needed to activate the CD changer through VAG COM. Is this true? Do i really have to pay $350 only to activate ONE single feature in my car?