Ok I have been having this problem for while and its annoying. I have a Cd changer in my ETC but when I bought it it didnt have the magazine(12 disk) so I bought one on ebay. I know we are suppose to use AC Delco but they gave me a poineer 12 disk and said that this works with my model. I thought they bs me so it worked for a while but if I try to switch to the next track or cd the output on the radio says Cd changer error. Sometimes it wants to participate about 20% of the time. So I dont know if its the magazine or the cd changer itself.