GMC Sierra 2015 Owner's Manual page 190

2. At the same time, press and
hold both the hand-held
transmitter button and one of the
three Universal Remote system
buttons to be used to operate
the garage door. Do not release
either button until the indicator
light goes from a slow to a rapid
flashing light. Then release both
buttons.
Some garage door openers may
require substitution of Step 2
with the procedure under Radio
Signals for Canada and Some
Gate Operators later in this
section.
3. Press and hold the newly
programmed Universal Remote
system button for five seconds
while watching the indicator light
and garage door activation.
If the indicator light stays on
continuously or the garage
door moves when the
button is pressed, then
programming is complete.
There is no need to complete
Steps 4 6.
If the indicator light does not
come on or the garage door
does not move, a second
button press may be
required. For a second time,
press and hold the newly
programmed button for
five seconds. If the light
stays on or the garage door
moves, programming is
complete.
If the indicator light blinks
rapidly for two seconds, then
changes to a solid light and
the garage door does not
move, continue with
programming Steps 4 6.
Instruments and Controls
Learn or Smart Button
4. After completing Steps 1 3,
locate the Learn or Smart button
inside the garage on the garage
door opener receiver. The name
and color of the button may vary
by manufacturer.
5. Press and release the Learn or
Smart button. Step 6 must be
completed within 30 seconds of
pressing this button.
6. Inside the vehicle, press and
hold the newly programmed
Universal Remote system button
for two seconds and then
release it. If the garage door
does not move or the lamp on
the garage door opener receiver
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