OK so yet another problem. Now the HUD is going in and out, it'* like someone is turning the dimming switch. However sometimes its so dim that it'* barely even visible at night, sometimes it'* the left half or the right half that is dim or out. When I hit the dashboard it comes back on bright and then will slowly start fading back or blinking in and out. Any thoughts? I'm thinking this is going to be a costly fix...do you have to pull the dash to get the HUD out?
I'm not sure if the Bonneville Hud is the same as the Grand Prix but I have fixed 2 of the 2 GP'* I have owned. Very simple fix, it was a cold solder joint on the light sensor. If you look at www.clubgp and search for hud problems they have a very good write up and pictures of what to re-solder. The worst part is getting the board out to solder.