GMC 1999 Jimmy Owner's Manual page 121

Add one peg at a time until the garage door opener
operates with the compartment door closed when you
press the button.
The pegs inside the
compartment door are used
to make sure the button on
the compartment door will
contact the control button
on the garage door opener.
With the garage door opener positioned properly and
the right number of pegs in place, you should only
have to press the button slightly to operate the opener.
Adjust the position of the garage door opener and add
or remove pegs, as needed, until the opener
operates properly.
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Now, with the compartment
door closed, press the
button again to make sure
the garage door opener
operates properly.
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