GMC 2012 Sierra Denali Owner's Manual page 172

5-62 Instruments and Controls
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.
Reprogramming Universal
Home Remote Buttons
Any of the three buttons can be
reprogrammed by repeating the
instructions.
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 5 or Customer Assistance
Offices (Mexico) on page 13 6.