My local Pioneeer dealer, Lott's Stereo in Santa Cruz, told me that since Apple's most recent iTunes update ALL makes of car stereos are screwed with the iPods. They are complaining to Apple and urging others to do the same...
Coincidentally, my apple classic took a dump...and the Apple store gave me a new one..and I'm NOT updating the software until it's fixed....this really sucks...but Apple gets on the ball if enough people complain.