Where is the parking brake switch on 2001 GMC sierra?

The parking brake switch on a 2001 GMC Sierra is located on the parking brake mechanism itself, under the center console. It's not a separate, easily accessible switch like a light switch. To get to it, you'll likely need to remove or at least partially disassemble the center console.

It's important to note that it's integrated into the parking brake lever assembly, not a stand-alone component you can easily see or replace. If you need to access or replace it, you'll need to consult a repair manual specific to your 2001 GMC Sierra to guide you through the disassembly process.