 Brake Lite issue (Not Switch)
So on my daughter's 318ti her brake lights stopped working. I got another switch and it did not make any difference. Tested the old switch and it works. Fuse 46 is good. But there is no voltage to the bulbs. When we were testing the switch, we heard what sounded like a relay tripping. I'm not aware of a relay in the brake light circuit. | 
Linear Mode
