GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 176

Example of Eight Dip Switches with Three Positions
The panel of switches might not appear exactly as
they do in the examples above, but they should be
similar.
The switch positions on the hand-held transmitter
could be labeled, as follows:
•
A switch in the up position could be labeled as
"Up," "+," or "On."
•
A switch in the down position could be labeled
as "Down," "−," or "Off."
•
A switch in the middle position could be labeled
as "Middle," "0," or "Neutral."
2-78
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.