Where is back up light switch located on 2000 silverado?

There is no switch used to activate the back up lights on a 2000 Chevy Silverado. The light should turn on automatically when you put the car in reverse. If it does not, the bulb may be out, or the fuse has gone bad. Another possiblity is an issue with the wiring to the light. Replacing the bulb is the cheapest troubleshooting option.