Hi I'm new to a 2009 Tahoe, not sure of the edition yet, and have an issue with the factory audio where the rear speakers don't work. I see many different locations for the factory amp and have checked a few of them, under the console, behind the driver's side dashboard, in the floor but can't seem to locate it. The only 2 places left to check are behind the glovebox or in the rear left panel. Which is the better place to look? I don't want to start pulling off panels if I don't have to. Eventually, I want to replace the factory system, but I can't right now.