99 keyless remote

I'm having trouble with my keyless remote for my 99 Bravada. I've tried the method of holding down the door unlock button and inserting key in ignition three times, leaving the key in on the third time. did not get a response from the vehicle as far as dings, so i assume the 99 takes a different method to program remote. Does anyone know the correct method?
Thanks, timbo40reale