Had this problem on my IS250 except that the light stayed on. It was the link arm on the rear suspension that had snapped, I actually found it a few days later on my drive. After a bit of research I removed the fuse. Light gone. The fuse doesn't serve any other purpose and the headlight self levelling was not that good in the first place. Passed 2 MOT's after that so obviously not a 'need to have'.