from this forum..
http://montecarloforum.com/forum/gen...lutions-30154/
Problem: My headlights don’t work or my high beams won’t stay on
Like cause: Bad multifunction switch (MFS)
Temporary solution: Jiggle the MFS and you should be able to get the lights to work again. I stress that this is a temporary solution and should only be used to get the lights back on to drive somewhere to get it fixed.
Permanent solution: Replace the MFS (I advise against junkyard replacements for this repair).
Prevention: nothing