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I know this is an old thread but when I googled "Toyota Highlander headlights on makes dashboard lights go off" its the first item that pops up on Google. So I had this issue on my 2007 Toyota Highlander and I too could not find this dimmer switch. So after some more googling I found a board that helped me. It is the same toggle that you use for your odometer setting....you know like when you are taking a trip of want to know how many miles you are traveling. Just adjust that until your interior lights come back on lol.....
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