GMC Sierra Classic 2007 Owner's Manual page 198

Programming Universal Home
Remote — Fixed Code
Most garage door openers sold before 1996 are
Fixed Code units.
Programming a garage door opener involves
time-sensitive actions, so read the entire procedure
before you begin. If you do not follow these
actions, the device will time out and you will have
to repeat the procedure.
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Follow these steps to program up to three devices:
1. To verify if you have a Fixed Code garage
door opener, remove the battery cover on
your hand held transmitter supplied by
the manufacturer of your garage door opener
motor. If you see a row of dip switches
similar to the graphic above, you have a Fixed
Code garage door opener. If you do not see
a row of dip switches, return to the previous
section for Programming Universal Home
Remote – Rolling Code.