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Hello, thanks for posting
There may be an aftermarket accessory wired into the dome light circuit, does it have an add on aftermarket alartm system? If so try to locate the fuses for it, most of the time they are inline fuses or disconnect the alarm computer, most of the time this is the problem. If any other aftermarket items like phone charger or GPS/Navigation is installed try disabling those as well, let me know if any of this helps and ee'll go from there.
By the way, what year is it?
Thanks for the reply
I am currently away from my home computer and have limited access to my files and the ability to reply , the radio still draws some current even though it is turned off but this should be minimal unless there is a problem with it. let me know if disconnecting it makes any difference. I'll see if I can access a wiring diagram if that doesn't help