Backstory - I had an issue with my sunroof leaking into my C30 and I think it may have caused a short in my fog lamps. The fog light button literally throws the car into crash mode and turning the button off and restarting the car will turn it off. (Meanwhile the manual says do not drive and have towed to dealer immediately) My mechanic and I tried removing the fuse and the relay and it still continued to do the same thing. Has anyone every heard of this or have any suggestions? If we can't find a solution I was just going to cut the wires and hard wire the fog lamps to low beams, obviously not the ideal route but safer than accidentally activating this on the highway or someone else using the car and doing so.

I had it flat bedded to the dealer when this first happened and they said it was a loose battery terminal... [definitely not the problem]

 

Did you figure this out? Just saw the same thing happen on a car.