I got the fob yesterday. Here's the supplied activation procedure:
1. Open the driver's door and cycle the power lock switch on the door Lock-Unlock twice.
2. Insert the keys in the ignition and turn the ignition switch from OFF to RUN eight times within ten seconds, ending in RUN. If the vehicle has successfully entered program mode, it will lock then unlock all doors automotically.
3. Within 20 seconds, press any button on the fob. The doors will lock then unlock to confirm the fob has been activated.
4. Repeat the previous step for each transmitter that will operate the vehicle.
5. Turn ignition switch to OFF, or wait up to 20 seconds after Step 1, to exit program mode. If a fob has been activated, the vehicle will lock and unlock all doors one last time to confirm.