The most likely cause of this is the multifunction switch as these bulbs are run through the switch. I would suggest starting with checking for power coming out of the switch and if you don't have any then I would replace it and go from there.
https://www.2carpros.com/articles/how-to-check-wiring
It is unlikely that the interior lights are related to this so I would just start with the exterior and if it repairs both then that is a bonus.
Below are the wiring diagrams that we need to test this. Please let us know if you have questions and what you find. Thanks
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Tuesday, June 8th, 2021 AT 5:57 PM