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It appears to be some kind of temp sensor, I am not sure. It was glued to the passanger side floor under the carpet about 4 inches in front of the interior relay box. It plugs in behind the computer module in the passanger foot rest next to the relay box. The plug looks kind of like an RCA jack.
I need to order a new one from GM but I am not sure what to ask for. I think it may be part of the HVAC but I can't find it in my service manual.
Ya know what.... when 1 Nasty Z said it looked like a radio antenna it got me to thinking. I have had the car for over a year so I forgot. I had a LoJack installed when I bought th car. I bet ya that this is the antenna for the LoJack!