Quote:
Originally Posted by X5_Rob
3/14/2013 UPDATE - Coming back from the airport yesterday and had the chance to engage the down hill assist.. it didn't work.. Nor will the traction control engage/disengage.. "4x4!" yellow warning light on dash..
Get in the car today and the "4x4! light is off.. traction control engages/disengages like normal.. no hills in flatland florida to try out the DHA today..
Whatever is causing the sytem to shut down is an intermittent problem which should make this even more fun to diagnos...
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The 4x4 light (DSC/xDrive) can be caused by different things. The DSC/ABS module uses the wheel sensors along with other sensors like yaw sensors and steering angle sensor.
So, it would be better if you can get to a dealer or shop that has GT1 or equivalent - BMW specific diagnostics. Because then they can not only get the code but will have a test plans to narrow down what part(s) maybe causing the problem(s) - specific to that code/fault.
So, for example, their test plan may go directly to the actual bad part or just walk through and test each sensor, then maybe the modules.
In my case, when I had just the 4x4 light, it was a bad rotation rate (yaw) sensor. At first I thought it was a bad module. Now, I also had a message of "Self Level Suspension Inactive" so its not exactly the same symptoms as yours.
If you want and are curious, here's the thread.
http://www.xoutpost.com/bmw-sav-foru...al-sensor.html
Probably that is what your shop will do. Check all the sensors and modules.