Where is backup light switch located on 2004 Chevy Tahoe?

The backup light switch on a 2004 Chevy Tahoe isn't a separate switch like a light switch in your house. Instead, it's a part of the transmission itself. It's a mechanical switch that's activated when you shift into reverse. Therefore, there's no individual switch to locate. If your backup lights aren't working, the problem is likely within the switch inside the transmission, the wiring to the lights, the lights themselves, or a blown fuse.