GMC 2009 Yukon XL Owner's Manual page 178

2. Write down the eight to 12 switch settings from left
to right as follows:
•
When a switch is in the up position, write "Left."
•
When a switch is in the down position, write
"Right."
•
If a switch is set between the up and down
position, write "Middle."
The switch settings written down in Step 2 now
become the button strokes to be entered into the
Universal Home Remote in Step 4. Be sure to
enter the switch settings written down in Step 2, in
order from left to right, into the Universal Home
Remote, when completing Step 4.
3. From inside your vehicle, first firmly press all three
buttons at the same time for about three seconds.
Release the buttons to put the Universal Home
Remote into programming mode.
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4. The indicator lights will blink slowly. Enter each
switch setting from Step 2 into your vehicle's
Universal Home Remote. You will have two and
one-half minutes to complete Step 4. Now
press one button on the Universal Home Remote
for each switch setting as follows:
•
If you wrote "Left," press the left button in the
vehicle.
•
If you wrote "Right," press the right button in the
vehicle.
•
If you wrote "Middle," press the middle button in
the vehicle.