Keep it held down until the garage door begins to close.
Program my 2012 gmc garage door opener.
Release both buttons after the light goes out.
Go to the garage door opener receiver motor head unit and locate the learn or smart button.
Press both the hand held garage door opener button and any one of the three buttons on the universal home remote system at the same time and hold them down.
Inside the vehicle hold down the button on the universal home remote system that you want to program to your garage door.
Firmly press the button and release the smart button.
After you press this button you now have 30.
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As soon as this happens release the button.