GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 175

If you do not see a row of dip switches, return to
the previous section for Programming Universal
Home Remote – Rolling Code.
Your hand held transmitter can have between
eight to 12 dip switches depending on the brand of
transmitter.
The garage door opener receiver (motor head unit)
could also have a row of dip switches that can
be used when programming the Universal Home
Remote. If the total number of switches on the motor
head and hand held transmitter are different, or if
the dip switch settings are different, use the
dip switch settings on the motor head unit to
program the Universal Home Remote. The motor
head dip switch settings can also be used when the
original hand held transmitter is not available.
Example of Eight Dip Switches with Two Positions
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