Trunk Key Cylinder Switch
WARNING: This page is about a different car, the 2011 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
Trunk key cylinder switch detects trunk key cylinder operation condition and then transmits ON (trunk lid open)/OFF (not operated) signal to BCM. The BCM uses this signal input to judge whether the trunk lid is opened by the authorized owner or not.