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No issue plugging in the GM3 as is. It is not coded to the car, i.e. no VIN number writing. But, you do need to re-synch the keys to the car. Many vids and how-tos on this, won't rehash. However, there are quite a few variables written in the GM3 that control windows and locks. When I replaced my GM3 I spent about 2 hours quality time going thru it to get my settings back and added a few that seemed worthwhile. I can try to find the file for my original GM3 and see what I changed a bit later today.
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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior
Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...
Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.
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