To be certain, you should:
* Consult your owner's manual: This is the best place to find the exact location for your specific vehicle.
* Search online for a wiring diagram: A wiring diagram for your year and model Tahoe will often show the location of the BCM. You can usually find these through online automotive parts retailers or repair forums.
Be aware that accessing the BCM may require some disassembly of the dashboard. If you're not comfortable doing this yourself, it's best to take your Tahoe to a qualified mechanic.