Just got my 2004 Grand Prix GTP 2 days ago. Man, all the electrical issues are driving me crazy!!!!
the HUD was working perfectly on the way back home to the Nashville, TN area from Georgia where I bought it. About 10-15 miles into the trip, poof, no more heads up!
Went to go to work the next morning (I leave home while it’* still dark), no HUD switch lights, no drivers side window switch lights (mirror light switches light up), no passenger side window switch lights, no steering wheel control lights, and only the right 1/2 of the HVAC control unit lights up. Only the radio and instrument panel have full lighting. Still no HUD, AT ALL! It’* not even showing any signs of green in the HUD unit itself.
Any ideas as to what the hell is going on?! I checked all the interior fuses in the passenger side of the dash. All fuses are fine!! Something had to have happened on the drive home 2 days ago. Maybe a relay??? HELP!!!!!

Need an electrical diagram of the lighting.

I can get more diagrams. But this is the interior one

I would use a scan tool to look at the BCM. Do you have a good scan tool?

I can get one. I have a couple of mechanic buddies that have one

You can rule out fixing the HVAC lights unless you open the unit and solder in new led'*..
Hope you get the rest sorted soon!

Believe it or not, I got all the lights except 1 working just by tapping on the face. Electrical stuff is weird!!

Several Apollo missions were fixed the same way!

Good one. LOL