I found an older thread with the same issue:
https://www.bimmerfest.com/forums/ar.../t-875162.html
That user mentioned this:
Quote:
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I then turned on the accessory ignition, then it successfully coded.
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So the accessory ignition needs to be on? Or do I need to let the other car run a bit longer to ensure at least 12.6V.
Appreciate all your assistance!