This has been covered many times. Programing must be done with all doors closed. Hold the unlock button on the door, turn the ignition on, off, on, off, then release the unlock button and the locks will cycle indicating that you are in programming mode. Now hold the unlock and lock buttons on the transmitter until the locks cycle indicating the transmitter is programed. Repeat that last step for each transmitter then turn the ignition on and off to exit programming mode.
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2000 Chevy Blazer ZR2
Performance Mods: Numerous
Suspension Mods: Some, but not enough
Exterior Mods: Just Right
1987 Buick Turbo T Dark Red
Low 11 sec sleeper
.030 4.1 block, PT6262E, & other odds and ends....
My Cardomain