E46Fanatics - View Single Post - Yellow Brake light and Triangle with ! with Circle
View Single Post
Old 12-30-2012, 02:41 PM   #19
Banned User
Join Date: Mar 2008
Location: San Diego
Posts: 551
My Ride: BMW
Originally Posted by RayPooley View Post
Speed sensors work by detecting changes in magnetic flux density as rotating elements move in and out of the sensor's magnetic field. They are basically permanent magnets with a coil wrapped around them. Anything that interferes, obstructs or bridges the normal gap between the magnet and the rotating element (eg: snow, mud) can have an impact on the voltage of the pulses received by the DME which, in turn, can be interpreted as fault resulting in automatic shutting down of DSC as precaution. So check the cleanliness and integrity of the wheel sensors first.
It's like you took the words right outta my mouth

What I meant was, when snow got packed up in my brakes, the light would sometimes come on and then go off when it was clear again.

Last edited by sweetbro858; 12-30-2012 at 02:43 PM.
sweetbro858 is offline   Reply With Quote