I dont think the Tracker and Blazers use the same remote? Might have been better off posting in the Blazer forum, but here are the 02 Blazer instructions:
All Extra transmitters must be programmed at this time. When a new transmitter is programmed, it will deactivate the old transmitters.
Transmitter Programming:
1) With the driver door closed, hold down the power UNLOCK button on the door panel.
2) Turn the ignition switch to the ON position.
3) Turn the ignition switch to the OFF position.
4) Turn the ignition switch to the ON position.
5) Turn the ignition switch to the OFF position.
6) Release the power unlock button on the door panel. The remote control door lock receiver will respond by cycling the locks to indicate the receiver is in the programming mode.
7) Hold down the lock and unlock button on the transmitter for about 30 seconds. The locks will again cycle to confirm programming.
- REPEAT step 7 for each additional transmitter.
8) Turn the ignition to the ON position in order to exit the transmitter programming mode.