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I think there are a few things and there all interconnected and this is the problem in fault finding. Yes your correct on the IBS, if the IBS detects a current drain it will do that, doesnt mean that the IBS is faulty, just that there is a current drain.
alternate, the IBS is faulty and causing issues with reading current and causing the DME /car to wake
I also went down this thought, thinking possibly the IBS is at fault, due to after a few times changing the leads, it did give a nasty spark and I'm wondering if that fried the IBS, althought there is no IBS errors, BUT I did see an IBS error showing on the current drain section.
My options was/were/are
1> replace passenger door handle
2> replace IBS
3> replace CAS / startgo module in trunk
$450
$300
$300
from BMW
I'm also just pissed off with the whole thing and waiting to find a 2 vert to trade my oner in for LOL
GOOD idea on swapping the pass/door handle I can at least run a chek on it in ISTA
when I get it out I can give you the path, wont be for a while
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