Error code 00 Buick century

SOURCE: need unlock code for 2003 buick century car radio

You will need to take the car to a dealership to have the service department unlock the radio for you. They have a special code to unlock the radio and then you are required to change the code to one that you will remember. An appointment should not be needed because this takes about 5 minutes. I do not remember the code, sorry.

SOURCE: Tape stuck in player - error code e13 shows

I just got a tape unstuck myself. Everytime I would hit eject it would make a clicking noise.

Here is what I did:
First I watched these videos to remove the radio.
http://www.youtube.com/watch?v=29MTa4FLjtk&feature=channel

http://www.youtube.com/watch?v=fqvk_PNo9Kg&feature=channel

Then I unscrewed the bottom panel of the radio.
Unscrew the brass screws holding in the cassette player portion of the radio.
Now flip the cassette player over to see your tape, etc.
When I pressed the eject button, I noticed a little motor with a worm gear would move a a gear which moved several other gears until it eventually moved a black gear which has a little post that moves the metal arm which moves back when pushing in a tape and moves forward when ejecting a tape. But I would get a clicking sound which seemed to be due to one gear trying to move a stuck gear.
I forgot the exact details of how I managed to get the tape out, but when I did get it out I noticed when I turned on the radio, it would act like it was trying to play a tape. But when it found out it couldn't, it would try to eject but would fail once again with the gear clicking sound.
I think I tried moving the black post on the black gear that moves the arm that pushes the tape out. Eventually I got to the point where the arm was pushed forward like it should be when a tape is ejected. At that point I was able to insert and eject a tape without any problems.