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My 06 expedition had a similar switch in about that location, but I think it was on the other side. It was installed to allow the aftermarket radio / head unit to play dvds when the car was not in park.
Are there any additional lights on the Expy? Like up front or in the rear ? Or do you see wiring in those areas that don't look factory ? Some people might add additional back up lights in the rear for better visibility or up front for same. Have you flipped it on and off at night or while driving? But it's definitely an owner add-on switch.
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