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its the alarm motion sensor. When you set the alarm if the car is rocked or kicked or crashed into the sensor trips the horn.

Looks like yours wasnt plugged in.
 

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Its the interior motion sensor for the factory alarm
 

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that is the FBI bugging your car. are you sure you didn't do anything illegal?

just kidding. like everyone said, that is the interior motion sensor for your car alarm
 
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