Once more, I think you may be mistaken about battery....I have the same light on, battery is fine, my indie shop shut it off with the computer, but it came back...and he tells me it is THE STEERING ANGLE SENSOR, ABOUT $450 TO CHANGE IT, LOCATED AT THE BOTTOM OF THE STEERING SHAFT UNDER THE DASH.
Also, when it is on you have NO ABS ??

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BMWCCA # 12660
14 GLK 350 M/B (hatefull POS gone)
05 CLK 500 AMG Cabrio
07 530xiT
09 Boxster