CHEVROLET Tahoe - Manual (Page 186)

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.
Example of Eight Dip Switches with Two Positions
186