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Hey.. sorry the wire running has been such a hassle. It's been so long since I did mine, its hard to remember exactly what I did. But, the holes through the metal were at the midline. As I'm thinking about it, I think there may have been two holes through metal. I'm pretty sure I drilled my hole through the plastic bumper above the license plate and then poked a clothes hanger through that hole aimed upward and then looked down through the metal holes from above at the tip of the hanger and just moved it around until I managed to get it to poke through the first metal hole and then worked it through the second.
I know that's probably not the easiest to follow and I apologize that I'm trying to remember exactly how a project went that I did months ago.
But, I did not remove the bumper. That would be way more of a hassle that I'd want to deal with.
I honestly don't use iMessage/text in CarPlay. But, I do know that CarPlay in any car doesn't show you the actual message. Siri reads it to you and asks if you want to reply. Not sure if that is what you're asking..
I have not had issues with blinking. I'm sure you're right about the dip switches. I just left mine as they were when delivered and it worked correctly. But I'm sure if you contact UniChip support and tell them you have a Z4 e89, they can tell you exactly how the switches should be set.
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