2012 GMC Sierra Owner's Manual - Page 199

Instruments and Controls 5-61 Universal Remote System Operation 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. Erasing Universal Home Remote Buttons The programmed buttons should be erased when the vehicle is sold or the lease ends. To erase either Rolling Code or Fixed Code settings on the Universal Home Remote device: 1. Press and hold the two outside buttons at the same time for approximately 20 seconds, until the indicator lights, located directly above the buttons, begin to blink rapidly. 2. Once the indicator lights begin to blink, release both buttons. The codes from all buttons will be erased. For help or information on the Universal Home Remote System, call the customer assistance phone number under Customer Assistance Offices (U.S. and Canada) on page 13‑4 or Customer Assistance Offices (Mexico) on page 13‑5. Reprogramming Universal Home Remote Buttons Any of the three buttons can be reprogrammed by repeating the instructions.