I have a Pioneer CXA8332 remote that I am using with an equally old Pioneer DEH-445 head unit. There is a button on the remote labeled "LRN" for learn. I used to know how to program that button, but I can not remember how to do it. Any of you guys recall?
Sorry for the late reply......Great question. Didn't you hold down the learn button for a few seconds then hit the comand on the head unit?