Yeah I try to not make a habit of spouting off incorrect information. As to where I got the information for it, that would be from bagman1 our forum sponsor from onlinemazdaparts.com. It could also have something to do with the multiple audio input threads I compiled on several forums over the past four years.
Mazda has actually changed manufacturers for the HU's 2-3 times..... So far I believe there have been Panasonic, Sanyo and Clarion HU's before the '08.5 refresh. Why they decided to change not only the manufacturer but the protocol and harness connections I can't speak to.
Design,
We already know the OP has a '08.5 model as he stated he had a 03/08 build date. '08.5 models were those produced after 01/08. It definitely sounds like he tried using an '04-'08 module with a '08.5 harness.
The one fact that remains is that you said he would need the OEM module.... from his post he states that he went to the mazda tech who installs the ipod adapters into the car.... to me that indicates he AT FIRST purchased the Mazda one, and then later tried the car audio one from therpmstore.com
So did Mazda give him the incorrect module then?