i just received a used e60 6 disc cd changer. i want to find out if anyone can help me with directions on installing it. ihave the cut out in the glove box for it and i want to know the wire hook ups for it. i think i will need reprogramming from the dealer but i wanted to install it myself. any help would be great. when i turn on my radio i notice that there is an icon that shows multiple discs. does this mean im prgrammed for the changer? thanks