Hey folks. 2003 C5. Near the end of a 10-hour drive home with the car, all of the interior lights stopped working. Dash, center console, arm rest--everything. It was night, so thankfully the heads up display was working. I assumed fuse, but when I pulled over and turned off the engine, all the lights came back on. Turn the key and start the engine again, and they all go black. And the INT ADJ function does nothing. I'm at a loss on this one. Thanks!