i've been using a sony mdx-c6500x for some years now in an '87 gmc s15. last week i got an '03 sonoma. i was about to swap out factory disc player with my sony, but a buddy told me i might run into problems with engine computer and such. new truck has basic amfm/cd, no onstar or steering wheel controls. i can cheerfully lose door chimes. :) any info would be nice, thanx, b:)