Hi,
That is an interesting one. What happens when you use the turn signals? Does the radio flash also?
What I think is happening is you have a bad ground under the dash. This is only theory at this point, but I believe the flasher switch has either shorted internally or has lost ground and is allowing power to back feed through the switch and to the interior lighting or radio.
Take a look at the attached pic. Why exactly this would only affect the front lights is a question at this point. However, check the ground that I circled in the attached picture. Make sure it is tight and not corroded or damaged. If that isn't an issue and you are sure the front bulbs are good, we need to perform a CAN scan on the vehicle. CAN stands for computer area network. If you notice there are wires which are part of the computer area network (data lines). Here is a link that shows how it's done.
https://youtu.be/InIlnsjOVFA
Let me know what you find.
Joe
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Saturday, June 20th, 2020 AT 8:34 PM