This was passed on to me, you might give this a try and see if it will work for you
** Theftlock Bypass
1. Press and hold presets 2 & 3 for about 10 seconds until the first 3
digits of the display code are displayed.
2. Write the numbers down.
3. Press the AM/FM button, write down the next 3 numbers.
4. Call 1 800 xxx xxxx, listen to the whole message carefully, when asked, enter 206010, press the # button and enter the 6 digit code from the radio, you will get an unlock code, write it down.
5. Go back to the car, press the HR button and set the first 2 numbers, then press MIN button and set the next two last numbers, press AM/FM button, SEC should be displayed, turn on radio."