GMC 2007 Acadia Owner's Manual page 152

Some entry gates and garage door openers
may require you to substitute Step 3 with
the procedure noted in "Gate Operator and
Canadian Programming" later in this section.
4. The indicator light will flash slowly at first and
then rapidly after Universal Home Remote
successfully receives the frequency signal from
the hand-held transmitter. Release both
buttons.
5. Press and hold the newly-trained Universal
Home Remote button and observe the
indicator light.
If the indicator light stays on continuously,
programming is complete and your device
should activate when the Universal Home
Remote button is pressed and released.
To program the remaining two Universal Home
Remote buttons, begin with Step 2 under
"Programming Universal Home Remote." Do
not repeat Step 1 as this will erase all of
the programmed channels.
If the indicator light blinks rapidly for
two seconds and then turns to a constant light,
continue with Steps 6 through 8 following to
complete the programming of a rolling-code
device, most commonly, a garage door opener.
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6. Locate in the garage, the garage door opener
receiver (motor-head unit). Locate the "Learn"
or "Smart" button. This can usually be
found where the hanging antenna wire is
attached to the motor-head unit.
7. Firmly press and release the "Learn" or
"Smart" button. The name and color of
the button may vary by manufacturer.
You will have 30 seconds to start Step 8.
8. Return to the vehicle. Firmly press and hold the
programmed Universal Home Remote button
for two seconds, then release it. Immediately
press and hold the same button a second time
for two seconds, then release it. Immediately,
press and hold the same button a third time for
two seconds, then release.
The Universal Home Remote should now
activate the rolling-code device.
To program the remaining two Universal Home
Remote buttons, begin with Step 2 of
"Programming Universal Home Remote." You do
not want to repeat Step 1, as this will erase
all previous programming from the Universal Home
Remote buttons.