I'm having problems with my aftermarket cd changer in my A4 i installed asat nav plus unit 8eoo35192b and then got a 6 disc cd changer no 8eoo35111 when i connect the changer has power but the headunit says there is "no cd changer" please help i am sad

... had the same problem myself when I swapped from Symphony II to RNS-E.

You'll also ned to re-code the sat nav to tell it there is a CD changer connected. 5 minutes job with VAG-COM.