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illuminated temperature control buttons 2021 sienna xse


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the illuminated temperature control buttons in my 2021 SIENNA XSE AWD only illuminate at night. As a result the function buttons are nearly impossible to read during the day.  How do I activate the illumination feature permanently?  

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searched all those resources.  Dealer rarely has that kind of information I've found, although I really like my dealer. I'm looking outside the obvious sources.... 


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