For Big Windy: It is the "why did they change this?, and what did they do to the programming when they did this?" that is the challenge and downfall because noone seems to be willing to provide any insight that allows understanding the operation let alone modification even in the Helms manuals. Understanding and then making the DLR work on the LED's in the 2007 was a PITI. From experience I rather not expound on, Stabiltrack and service suspension system alarms can be caused by low battery voltage or bad grounds instead of actual suspension problems. And this programmed to VIN requirement is significantly painful..which is why most VCIM retrofits for bluetooth don't work for Onstar continued useage. It is MY vehicle yet many of its operations and functions are treated like a proprietary lease which I am not allowed to access, understand or change even if I am willing to give up all warranty and legal claims against the manufacturer. But I must commend them on their ability to engineer these new vehicles. Now when are they going to offer a complete Platinum option for an EXT? I want a LSA equipped, Platinum EXT-V with rainsense wipers, heated washer fluid, part time 4 wheel drive, front/side/rear cameras, and bluetooth apps. All the parts are available NOW. I guess I will have to build it myself.