Just got a 2000 s80 2.8 w turbo. When I try to turn the brights (or high beams) on, they don't stay on, they just bounce back to the off position. Now I know you are all going to tell me to put my light switch to the twelve o'clock position, but I've tried that, and every other position, and it still happens. Also the entertainment system is so dim that I can't read most of the time. I've pulled out the light switch box a few times and the high beams will stay on (or work), and the dash will go from dim to bright, but it just turns off again later. Also my overhead lights have stopped working all the sudden but I'm not sure it's related.

 

Took me a while to figure this one out. It's this entire module, replace and it will be working again.