Hi there,
I would suggest that your switch for the Passive function is not working, and the transmitter is still sending a signal.
We have had a few of these, and you can also use a 2000 transmitter, without the passive function, and it will work correctly when programmed.
Allthebest, c4c5
__________________
GM World Class Certified Technician, it is not a goal, but a steadfast commitment to excellence in a field more demanding than most. Chevrolet Professional service guild NCM#7993. My greatest asset, my daughter.
http://corvettemechanic.com