1997 GMC Suburban Owner's Manual - Page 123

4. Add one peg at a time until the PUSH button on the closed compartment door operates the garage I door Opener- 5. Now,with the compartment door closed, push the button marked PUSH to make sure the garage door opener operates properly. With the garage door opener positioned properly and the right number of pegs in place, you should only have to push the PUSH button slightly to operate the opener. i. Adjust the position of the garage door opener and add or remove pegs, as needed, until the opener operates properly.