Jamie's right. It's the "learning button" to adjust how far the shade lowers -- both when the ignition switch is on (driving sun visor) and off (camping privacy shade. I found a pdf file that describes how to use this switch and adjust the distance, but I can tell ypu8 the description makes the procedure sound like a Royal PITA. If you don't HAVE to adjust it, I wouldn't touch it. I just kind of folded my wire up in the end so it couldn't be seen.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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