you have an 02 right? They have the HUD controls on the dash off to the side somwhere I believe. In the 04+ like mine they have the control in the center by the shifter. There is a seperate wiring harness that they would install for cars with traction control/HUD controls that has most but not all of it run already. The last part is what I'm waiting on my pins to get here for.
During my install, I did take apart the HUD unit itself to see what was rattling inside. Turns out it was a small plastic piece but I couldn't find where it had come from so I just took it out. WHile I was looking, I found that there are 2 mirrors used not 1 like I think some previous models used. I think that may play a part in the focusing issues. I also found that there is some small LED or sensor on the top half of the HUD unit. Its right near the plastic window and would shine towards the front of the car. I'm not sure what it is exactly. I could be a sensor for daytime/nighttime but I would have guessed it to use the same thing the DIC uses to switch from day to night mode. Any other guesses on that?