Removing what I can of this thread as the problem was the equipment, not the car. May have been misleading to others. Sorry to waste these few seconds for you - I know it all adds up when you're looking for answers!
It all dependes if you want a reader or scanner. I have a actron cp 9575 from autozone works fine for my 02 rio 99 bucks last year. I needed to upgrade for my newer cars. An obdII should work on your 03 they did not change to the canbus protocall till around 06your reader should work for an 03. Take it back and get your money back if you can and get a new one or read the directions again maybe your missing something.Best of luck with it. Reguards Ronjohn