Where is the backup light switch on a 97 gmc suburban?

On a 1997 GMC Suburban, the backup light switch is typically located on the transmission. Specifically, it can be found on the driver's side of the transmission, near the shift linkage. To access it, you may need to crawl under the vehicle and look for a small electrical connector attached to the transmission case. If you're having trouble locating it, referring to a repair manual for your specific model can provide detailed guidance.