One problem related to high/low beam switch has been reported for the 2000 Chevrolet Silverado. The most recently reported issues are listed below.
The headlight problem involves an override button installed on the 2000 Silverado that is to bypass the auto headlight on even during the day. The button, according to the manual, is to be able to turn off the headlights ( this is the only way, there is no off position ) if you are stopped, ( like at a burger place) with your engine running & you don't want your lights on. But, I found that you also can be going down the road, ( I did this going 50 mph), & push this button 3 time & all the lights go out. The dash, & front & rear lights! I paniced & could not find how to turn them back on. I had to make an emergency stop, ( lucky no one was behind me), & then I found I had to turn the switch to manual lights on control to get them back on. I later found out from the manual that this switch was nitended for the bypass operation I spoke of earlier. I think you should not be able to turn off all your lights while moving by simply pushing this button three times! the vibration problem seem to be affecting a lot of the new 1999 & 2000 model Silverado trucks. Gm says they are working on it, but do not have a fix yet. Not safety related but annoying! just not right for a new truck. I have inlisted the help of the bbb on this problem since dealer will not fix. Says since most of the new models do it, they list it as a normal characteristic!!! thanks!.