@Effduration and @EODguy, thanks for the replies. Unfortunately, I'm no stranger to failed ignition switches on my E53. At 200k miles currently, I'm on my 3rd replacement switch already, and it's only 15k miles old. However, none of the previous failures showed symptoms like these. I've got a spare I will go ahead and install to test, but if it's not the switch what are some other possibilities? Thanks again-

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'05 X5 3.0
'06 325i
'90 E30/S52