Head unit has CHANGER controls, but didn't come with the actual changer. I purchased a Chrysler CD Changer for my year car, and hooked it up with the DATA Lead wire from head unit to changer. Changer powers up and ejects disc carriage just fine, but the head unit won't recognize the changer to control it.

Is there something I have done wrong?

Do I need some sort of code or anything punched into the radio?

Any tips or Suggestions?