To get the radio out, you need to remove the trim panel that surrounds it, and the intrument cluster. So as not to re-invent the wheel, below is a link to a most excellent post by Hawkjet that shows the removal of the trim piece. Look at pictures 1 - 7 specifically.
Once the trim is off, the radio is very easy to remove. There are four tabs (two on each side of the radio). Simply press all four inwards to unlock them and the radio will slide right out. Reinstalling is equally easy by sliding the radio in until all four clips snap into place.
With the radio out, look at the large connector in the back of the radio bay. This is a 32 cavity Dock-N-Lock connector (16 top, 16 bottom). Row 'B' is across the top and row 'A' is on the underside. Pin 1 is to the very right, while pin 16 is closest to the steering wheel.
You are looking to see if there are gold-plated terminals in positions A9, A10 and A11. Below is a picture of the connector, similar to what you should see. You'll notice that position A5 on my connector doesn't have a terminal. This will give you reference to what a vacant cavity looks like. Let me know what you find