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Thanks, that might make sense. I've noticed that what passes for weatherstripping above the D pillar is torn, on both sides. IDK, maybe that's a red herring but still. I've already had the common TPMS sensor failure commonly thought to be caused by water on the right side so it makes sense...

Oops, should have mentioned that. 09 L322 HSE. Symptoms make me think failed/failing solder joint but heck, that could be anywhere.

Sorry to bring back old memories but I'm having the same issue you did but don't understand what the part was that you swapped. Google just says that the IHU is the head unit...do you have a part number? And how did you isolate the problem to that part? Mine started failing only when the...