[ron2004gt]

I don't think the radios require a security code since it never asked for one after the battery pull.

BUT ... I do think the radio's need to determine they have a CD player to communicate with. The radio head must either know a CD player is present because they are given a setting when installed or they know this because the CD player communicates once it successfully initializes at each power up.

Either #1 or #2 ?

#1 It could be that the CD player is jammed after having it's power pulled and isn't sending a "I am here and good to play" message to the radio head. In this case I just need to pull the CD player and clear the CDs and it will then work perhaps. Guess I need to do this somehow.

#2 It could be that the radio head lost a manual setting "you have a CD player attached" when the battery was pulled and until that setting is manual given again it will never work again. This would be a secret setup
procedure that we would like to know about.

I did read somewhere about the CD players becoming jammed, nothing mentioned a loss of connection but might make sense.