WARNING: This page is about a different car, the 2005 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
Warning signal (Door switch signal) is received from BCM through CAN communication line.
Fig 1: Scan Tool Display - Warning Indications
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Warning Detection And Cancel Conditions Table