To reset the micro switch on the radio, that when stuck will cause the Radio to not accept CDs do the following; If you have the radio code and are familiar with using it, take the radio out of the vehicle, if not you can do this with the radio in the car and connected. Put the shifter in neutral and place a blanket or something over the shifter, pull the radio out and rest the radio on top of the shifter. Looking at the front of the radio, there are two black plastic rails on both sides of the radio, you will be removing the rail on the right (looking at the radio).

         Remove the two small Philips screws (circled in yellow) holding the rail in place and then gently snap the black rail off. Behind the black plastic rail you just took off are a few small openings in the casing.

         Two holes back if you look up into the radio, you are looking for a black, very small micro switch facing the rear of the radio. The micro switch is on the edge of the circuit board close to the opening. Twiddle the small tip sticking out (it's about 1/4 inch and the size of a tooth pick) in and out several time. You could spray some silicon on a swab and dab the end of the switch, don't use anything like grease that might make the switch stick. Assemble in reverse order.