If you run across a 2019 Toyota Highlander (possible Tundra also) with the radio and climate control panels go dark when the headlights are turned on, check the instrument cluster as the cause. These ground out through the instrument cluster so replacing it should solve this issue.
One of the most frustrating things to have happen is to have an instrument cluster bulb go out and not have the correct part number to order a new one. Most repair shops will ask you to bring in the old bulb and see if they can match it up. Then to find out that they have to order it.
If you...
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