I have a 98, I'm not sure this would apply with yours...
1. press 2 and 3 button simultaneously until a code comes up, write it down
2. press your FM button, a second code should come up..write it down
3. well the last step you will have to contact your dealer or perhaps go to:
www.j-bom.com (forums), and search under radio/theft systems, you should be able to find some help on obtaining the last set of numbers. every car has a different set of numbers. hope this helps