2008 GMC Acadia Owner's Manual - Page 135

8. Immediately return to the vehicle. Firmly press and hold the Universal Home Remote button, chosen in Step 3 to control the garage door, for two seconds, and then release it. If the garage door does not move, press and hold the same button a second time for two seconds, and then release it. Again, if the door does not move, press and hold the same button a third time for two seconds, and then release. The Universal Home Remote should now activate the garage door. To program the remaining two Universal Home Remote buttons, begin with Step 2 of "Programming the Universal Home Remote System." Do not repeat Step 1, as this will erase all previous programming from the Universal Home Remote buttons. 6. After Steps 1 through 5 have been completed, locate inside the garage the garage door opener receiver (motor-head unit). Locate the "Learn" or "Smart" button. The name and color of the button may vary by manufacturer. 7. Firmly press and release the "Learn" or "Smart" button. After you press this button, you will have 30 seconds to complete Step 8. 2-53