Heated seat distribution should be in iDrive.
If '10s were the old version, push left and scroll the 2nd row options to get to it. In the new iDrive, select Menu, settings, and climate to get to it.

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Richard
Sir Snaps-a-lot, 9 Time Dragon Slayer (54 runs!)
2011 X5 50i Alpine White, Biege Nappa /Lt Poplar M Sport
2009 Z4 35i, Black Sapphire/Ivory-Black/Anthracite

Gone but not forgotten: '08 550i, '06 X3, '06 650i, '02 M5, '99 540i