If a door switch is bad, a tone sounds and the light goes off after you start driving (although the display still shows "DOOR"). When you stop, the light will come back on. The tone continues to sound each time you start driving. You can turn the light off with the switch next to the headlight switch.
If you drove home with the light on all the time, your problem is different, like the interior light switch (also dims the instrument lights) is on.
I've had the door switch problem twice, once after a vigorous power washing, the other after a very harsh rainstorm.
(as an aside, if there is a bad door switch, there is no way to change the display and view the trip odometer, what a design screw-up)
And I wouldn't rule out the Ipod install as a source of the problem, they could have done something that fried the BCM.
Good luck!
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2010 Red Rock Metallic H3. Just as cool as the first four Hummers I owned. Yeah, I have a problem.
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