i had a d2 profesionally installed in my vw passat. only other "accessories" i have, are a jl stealthbox sub and a pioneer 12 disc changer.
i recently decided to make an aux input port on an empty dash piece. so i bought a 2 rca male to 1 3.5mm female cable. i secured the 3.5mm side on the dash, and connected to rca end to another set of rca's from the headunit. those wires had a sticker "AUDIO INPUT"
yet when i try accessing the aux in the audio sources, it's grey'd out and will not let me choose it. am i doing something wrong?