there might be a chance that those speakers failed
in my fathers 95 the rear door speakers failed for some odd reason, upon looking one of the wires came loose internal to the speaker
to get a sony xplod radio out you need to remove the faceplate, then the plastic trim ring around it will come out, then you will either see two tabs which are the clips, you sqeeze and pull the radio out or there will be nothing and you need two special tools that come with the radio to get it out
the first is for older ones and the later is for newer one, ie I have a 2000 model and a 2004 model
