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ISTA-D has an ability to monitor current draw from various ECUs on the car. I’ve never used the feature, but google it and there are some videos on how to do so. That might get you started in the right direction with determining the system at fault
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2006 Z4 M Roadster - Silver Grey Metallic
2011 X3 xDrive28i - Deep Sea Blue Metallic
2012 X5 M - Monte Carlo Blue Metallic
2017 X1 xDrive28i - Alpine White
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