Chevrolet silverado 2012 Owner's Manual page 211

To program up to three devices:
1. From inside the vehicle, press
the two outside buttons at the
same time for one to
two seconds, and immediately
release them.
2. In the garage, locate the
garage door opener receiver
(motor-head unit). Find the
Learn or Smart button. It can
usually be found where the
hanging antenna wire is
attached to the motor-head unit
and may be a colored button.
Press this button. After pressing
this button, complete the
following steps in less than
30 seconds.
Instruments and Controls
3. Immediately return to the
vehicle. Press and hold the
Universal Home Remote 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
20 seconds.
4. Immediately, within one second,
release the button when the
garage door moves. The
indicator light will blink rapidly
until programming is complete.
5. Press and release the same
button again. The garage door
should move, confirming that
programming is successful and
complete.
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