Went thru this during the install process and had the tech properly connect the power to the right source. Found out by making a few calls to BMW techs that the most reliable key switch power is one wire coming out of the trunk fuse block. Works like a charm. BTW, almost all other key switch power sources will confuse the DME due to the proximity logic of the key fobs.
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2021 M340i
2020 X3 M40i - her car
2019 M5, AW, DP's, MSR CAI, BM3, SOLD
2020 Chev. ZR2 Bison truck, Daily Driver
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