heads up display in windshield went out what could it be
could possibly be the ballast for the led's not real common but i have heard of it on Cutlass' and Luminas HUD systems.
where would that be or could it be a fuse everything else works on car
behind the radio, its a nightmare to get at, and if you are going to go that far you might as well source out a replacement and just do a swap. A good rebuilt one runs about $125 on E-bay and the LED's are significantly brighter. Hope this helps.
Looking for a Used Grand Prix in your area?
CarGurus has 3,715 nationwide Grand Prix listings starting at $1,100.
Search Pontiac Grand Prix Questions
Pontiac Grand Prix Experts