i have a 2000 with a stock symphony stereo my defrost does not work at all and the rear speakers do not work. at first i checked the fuses and the switch seems to be working so i moved on from there. i ripped the entire car apart and this is what i found. there is a blue plug going to the driver's rear shelf speaker. think my car had an amped speaker and it blew so the original owner tried another speaker that wasn't the same and just left it unplugged. not sure if this plug affects the antennas yet. there is an antenna selection box located under the cd changer bracket and it switches between antenna receivers given the different frequencies. i held down button 1 and turned the radio on and it showed a display of the antenna and it's signal strength. all seemed to be working. i then moved on to vag which found no faults with the defrost circuit at all. the thing it did say was radio antenna always open but i'm not sure what that means? that's pretty much where i'm at. i have a bently but it's really provided no help. any help would be greatly appreciated.