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This is very complicated. You'll need the Onstar system,
because the 2003 Nav radio is dependant on the Onstar's
GPS function.
I wanted to do the same installation in my 2001, but it
looked like it was going to be VERY expensive. So I
got a Garmin Street Pilot III & mounted it on the console.
This aftermarket nav unit worked out fine.
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GM!!! BRING BACK OLDS!!!
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