Luggage Compartment Lid Ajar Switch
WARNING: This page is about a different car, the 2020 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
The luggage compartment lid ajar switch receives a voltage signal from the BCM through the cargo area lamp. The luggage compartment lid ajar switch is grounded to the vehicle. When the luggage compartment lid is closed, the ajar switch is closed, providing ground to the luggage compartment lamp.