Hood Ajar Switch
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The hood ajar switch (if equipped) is located in the hood latch assembly and is a discrete input to the BCM. The BCM utilizes this input as a means to active the alarm if the vehicle hood is opened while CTD is armed.