2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 217

5. After entering all of the switch positions, again, firmly press and release all three buttons at the same time. The indicator lights will turn on. 6. Press and hold the button that will be used to control the garage door until the garage door moves. The indicator light above the selected button should slowly blink. This button may need to be held for up to 55 seconds. 7. Immediately release the button when the garage door moves. The indicator light will blink rapidly until programming is complete. 8. Press and release the same button again. The garage door should move, confirming that programming is successful and complete. To program another Fixed Code device such as an additional garage door opener, a security device, or home automation device, repeat Steps 1-8, choosing a different button in Step 6 than what was used for the garage door opener. Using Universal Home Remote Press and hold the appropriate button for at least half of a second. The indicator light will come on while the signal is being transmitted. Reprogramming Universal Home Remote Buttons Any of the three buttons can be reprogrammed by repeating the instructions. 3-79