Not Manual Mode

Unified meter and A/C amp. reads not manual mode signal from A/T device (manual mode switch), and transmits the signals to TCM with CAN communication.
TCM transmits shift position indicator signal to unified meter and A/C amp. with CAN communication.
Unified meter and A/C amp. transmits shift position indicator signal to combination meter with the communication line.
Combination meter indicates A/T shift position when receiving shift position indicator signal.

Fig 1: Identifying Combination Meter Indicates A/T Shift Position Flow Chart
Courtesy of NISSAN MOTOR CO., U.S.A.