My headlights go up fine but wont go down. If I push really hard on the lower portion of the switch I can hear some noise coming from the headlight area.
No you have to take instrument cover off and the switch is behind that .Been a long time since I've been in there but it should be screwed in together with the dimmer for your dash lights.
I had the same problem. If you push hard on the switch in the off position the lights would go down. I replaced the switch and all is well.
You need to remove the instrument bezel to access the switch. It's a very easy job. The switch assembly is still available through GM. If your parts man can't find it, let me know and I'll dig up the part number.
Does the instrument cover pop off like the GNs. Dont see any screws. When I got the car, the owner told me you have to push hard on the right side of the switch. If I push any harder, I'll put my finger through the dash.