My 2003 530i has the right tail lamp that isn't working. The running lamp works fine. The yellow flasher, blinker, brake light and backup light doesn't work. Nor does the high-mounted stop lamp. I've tested all bulbs in the left tail lamp and they all work fine, including the high-mounted stop lamp. I've put 12v dc across the ground on the lamp connector pins and all bulbs light up fine. I get the error "Check Brake Lights" on the instrument display. Any idea on what's happening here and how to fix it?