K, I just bought an 04' sle, no Bose, No Onstar.. It came with a Pioneer DEH-P8600mp. Front door speakers do not work... Rear door speakers are working, but heres the deal... The rears seem to be wired to the front output.. When i fade to the front the rear speakers stay on, fronts off... When I fade to rear, No sound????? Ive pulled the harness and all the wiring is correct.. Dis-connected radio for a bit but no help... Any Ideas??