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That's right, I forgot that was for the auto climate controls. The part number from my first post says its a microphone when I googled that part number. There are also a few eBay listings that say OnStar microphone. I'm not saying those listings are correct. I just need to know exactly what this is since I'm deleting the center console to convert to a front bench seat. I know what everything else is for and have a plan to relocate or eliminate. But I'm still unsure about the mic I pulled out.That tiny grill in the headliner is NOT a microphone. Its an aspiration fan, something to do with the auto climate controls. There are also temperature sensors in the truck for the climate control. If your truck has the auto climate control, I suspect that is a temperature sensor in the center console and not a microphone. The only actual microphone that I know of is the one clipped to the side of the overhead console next to the reading lights.