I am having [ocassionally] similar problem with the heating of steering wheel. This only happened ~ 3 times, and everytime during very long drive (after keeping it on for 2+ hours). Not a big deal given it is already warm in the car by then, but I can't imagine power management unit would complain at that point - after all the engine has been running and charging the system for quite some time...

Dont have time yet to take it for service, wonder if anyone else have/had this issue, and if it was resolved for you?

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive