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2003 has a canbus system there is a wire for the phone option that the radio should be connected to that turns it on / off via the key. It took me many an hour to find that nugget of info. If you can locate a wiring diagram been years since i did mine it will point out exactly what you need. The wire is in the center console right in front of the shifter under the trays. My guess is an amateur put the radio in and didn't know what he or she was doing. I would pull it all out and start over and do it correctly.
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