WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
Warning signal is received from BCM through CAN communication line.
Fig 1: Identifying Warning Indications Display
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Warning Indications - Detection And Cause Of Malfunction Description Chart