Ok, I have been having a hard time with this for about 3 months and i cant figure it out. I am having a problem with my reverse lights. One day they just quit. Now I have checked the bulb and they are all good. I took a tester light and checked for power and still no go. I also checked if they had a good ground and they did. So now I want to know what wire under the dash controls the reverse lights? Does anyone know this. This would be great. Thanks

Trans range swtich on the trans where the linkage enters the top of the trans case under the hood.

Do you know which one it is excatly?

Do not know the color wire, sorry. Try the wiring diagrams at autozone.com/repairinfo, they go up to the 96 Lumina, which is the same.