My '90 535i doesn't have a CD changer installed, but has the prewired cables (one is round and blue and the other is a small rectangular plug). I know this topic has been done to death, but, I am wondering if there is only very specific units that would "plug and play" for my car? I hate to have to cut wires/solder and all that stuff, if I don't have to.
Also, how does one control the changer when it is installed, is it done with the radio controls or ? I don't have the radio manual for my car.