Not Manual Mode

WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Combination Meter And TCM Communication Diagram
Courtesy of NISSAN MOTOR CO., U.S.A.